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Architect's & Engineer's Specifications
ISA Series
ISA 280
ARCHITECT'S AND ENGINEER'S SPECIFICATIONS
The amplifier shall contain all solid-state circuitry, using complementary
silicon output devices. The amplifier shall operate from 50-60 Hz AC power.
The amplifier shall draw 540 VA or less when driven with random program
material at 1/8 rated power into four-ohm loads. The amplifier shall be
equipped with a 320-C19 16A IEC mains connector and a removable power cord.
Units configured for 120V use shall have an 8A circuit breaker on the rear
panel and operate safely from a 15A 120V AC outlet, and their power cords
shall have a standard NEMA AC plug. Units configured for 230V use shall
have a 4A circuit breaker on the rear panel and shall have a power cord
with a standard Schuko AC plug. The amplifier shall comply with FCC part
15 Class B requirements.
The amplifier shall employ forced-air cooling with a temperature-controlled
fan, variable in speed from zero to full for minimum acoustic noise. Airflow
shall be from rear to front to avoid temperature rise inside the rack. Rack
mounting shall be possible without clearance between amplifiers for ventilation.
The amplifier shall be capable of continuous operation at 1/3 power into
four-ohm loads, in ambient temperatures up to 104°F (40°C).
The amplifier shall contain two independent amplifier channels powered by
a conventional power supply with a toroidal transformer. All amplifier protection
systems shall be synchronized and self-resetting upon removal of fault.
Each channel shall have circuitry to protect against short circuits or mismatched
loads. Each channel shall independently monitor heat sink temperature to
control the fan speed and if necessary, mute the signal to prevent excessive
temperature. Both channels shall mute for several seconds after turn-on,
and within 1/4 second after turn-off or loss of AC power. Each channel's
output section shall be AC coupled to protect the load against DC faults.
Each channel shall have an independent and defeatable clip limiter and 12
dB per octave high-pass filter. The corner frequency of the filter shall
be selectable between 30 and 70 Hz. Each channel's output section shall
operate in Class AB+B. The front panel shall contain these features: an
AC power switch; a green LED status indicator for power; independent LED
channel output indicators for signal present or -30 dB (green), and clip
(red). The gain controls shall be located on the rear panel and have 11
detents. They shall be labeled in dB of attenuation, from 0 to infinity.
From 0 to 14 dB, the attenuation steps shall be 2 dB per detent. The labeled
attenuation settings shall be 0, 4, 10, 18, 25, and ∞ dB.
The output connector for both channels shall be a barrier strip located
on the rear panel, with screw terminals and a safety shroud. The terminals
shall be arranged to facilitate bridged mono connection.
The inputs shall be located on the rear panel, consisting of a 3-pin detachable
terminal block and a 3-pin XLR connector for each channel. The XLR input
shall be wired with pin 2 high. Inputs shall be electronically balanced,
with a minimum impedance of 20 kilohms balanced and 10 kilohms unbalanced,
and a common mode rejection of at least 50 dB from 20 Hz to 20 kHz.
A High Density 15-pin DataPort connector shall be provided for carrying
both audio and amplifier operational status signals to and from a QSControl
network. The DataPort shall also accommodate plug-in crossover filters and
other such accessories. A set of DIP switches on the rear panel shall be
provided for: setting bridged mono and parallel-input operation; selecting
clip limiters; and selecting high-pass filters and setting their frequencies.
Each channel shall be capable of meeting the following performance criteria
with both channels driven: Sine-wave output power of 185 watts into 8 ohms,
20 Hz to 20 kHz at <0.03% THD; 280 watts into 4 ohms, 20 Hz to 20 kHz
at <0.05% THD; and 430 watts into 2 ohms, 1 kHz at <1% THD.
Frequency response (with filters not engaged) at 3 dB below rated power
shall be 20 Hz to 20 kHz ±0.2 dB. The maximum voltage gain shall
be 33.4x, equivalent to 30.5 dB, and the 8-ohm input sensitivity shall be
1.15 Vrms (+3.4 dBu). The unweighted signal to noise ratio over the range
of 20 Hz to 20 kHz shall exceed 100 dB, referenced to full output. IHF damping
factor shall exceed 200 with an 8-ohm load.
The amplifier chassis shall occupy three rack spaces and have provisions
for securing the rear corners. Depth from mounting surface to tips of rear
supports shall be 15.9" (40.4 cm).
The amplifier's weight shall not exceed 36 lb. (16.3 kg). The amplifier
shall be the QSC Audio Products ISA 280.
TOP
ISA 300Ti
ARCHITECT'S AND ENGINEER'S SPECIFICATIONS
The amplifier shall contain all solid-state circuitry, using complementary
silicon output devices. The amplifier shall operate from 50-60 Hz AC power.
The amplifier shall draw 540 VA or less when driven with random program
material at 1/8 rated power into four-ohm loads. The amplifier shall be
equipped with a 320-C19 16A IEC mains connector and a removable power cord.
Units configured for 120V use shall have an 8A circuit breaker on the rear
panel and operate safely from a 15A 120V AC outlet, and their power cords
shall have a standard NEMA AC plug. Units configured for 230V use shall
have a 4A circuit breaker on the rear panel and shall have a power cord
with a standard Schuko AC plug. The amplifier shall comply with FCC part
15 Class B requirements.
The amplifier shall employ forced-air cooling with a temperature-controlled
fan, variable in speed from zero to full for minimum acoustic noise. Airflow
shall be from rear to front to avoid temperature rise inside the rack. Rack
mounting shall be possible without clearance between amplifiers for ventilation.
The amplifier shall be capable of continuous operation at 1/3 power into
four-ohm loads, in ambient temperatures up to 104°F (40°C).
The amplifier shall contain two independent amplifier channels powered by
a conventional power supply with a toroidal transformer. All amplifier protection
systems shall be synchronized and self-resetting upon removal of fault.
Each channel shall have circuitry to protect against short circuits or mismatched
loads. Each channel shall independently monitor heat sink temperature to
control the fan speed and if necessary, mute the signal to prevent excessive
temperature. Both channels shall mute for several seconds after turn-on,
and within 1/4 second after turn-off or loss of AC power. Each channel's
output section shall be AC coupled to protect the load against DC faults.
Each channel shall have an independent and defeatable clip limiter and a
12 dB per octave high-pass filter. The corner frequency of the filter shall
be selectable between 50 and 75 Hz. Each channel's output section shall
operate in Class AB+B.
The front panel shall contain these features: an AC power switch; a green
LED status indicator for power; independent LED channel output indicators
for signal present or -30 dB (green), and clip (red). The gain controls
shall be located on the rear panel and have 11 detents. They shall be labeled
in dB of attenuation, from 0 to infinity. From 0 to 14 dB, the attenuation
steps shall be 2 dB per detent. The labeled attenuation settings shall be
0, 4, 10, 18, 25, and ∞ dB.
The amplifier shall be designed to drive load impedances as low as 2 ohms
per channel, and each output shall have an internal toroidal transformer
with taps at 25, 70, and 100 volts for driving distributed lines. The output
connectors for both channels shall be barrier strips located on the rear
panel, with screw terminals and a safety shroud. There shall be terminals
for both low-impedance and 25-, 70-, and 100-volt operation.
The inputs shall be located on the rear panel, consisting of a 3-pin detachable
terminal block and a 3-pin XLR connector for each channel. The XLR input
shall be wired with pin 2 high. Inputs shall be electronically balanced,
with a minimum impedance of 20 kilohms balanced and 10 kilohms unbalanced,
and a common mode rejection of at least 50 dB from 20 Hz to 20 kHz.
A High Density 15-pin DataPort connector shall be provided for carrying
both audio and amplifier operational status signals to and from a QSControl
network. The DataPort shall also accommodate plug-in crossover filters and
other such accessories.
A set of DIP switches on the rear panel shall be provided for: setting bridged
mono and parallel-input operation; selecting clip limiters; and selecting
high-pass filters and setting their frequencies.
Each channel shall be capable of meeting the following performance criteria
with both channels driven: Sine-wave output power of 185 watts into 8 ohms,
20 Hz to 20 kHz at <0.03% THD; 280 watts into 4 ohms, 20 Hz to 20 kHz
at <0.05% THD; 430 watts into 2 ohms, 1 kHz at <1% THD; 300 watts
at 70 or 100 volts, 50 Hz to 16 kHz at <0.5% THD, and 240 watts at 25
volts, 50 Hz to 16 kHz at <0.5% THD.
Frequency response (with filters not engaged) at 3 dB below rated power
shall be 20 Hz to 20 kHz ±0.2 dB. The maximum voltage gain at the
low-impedance outputs shall be 33.4x, equivalent to 30.5 dB, and the 8-ohm
input sensitivity shall be 1.15 Vrms (+3.4 dBu). The unweighted signal to
noise ratio over the range of 20 Hz to 20 kHz shall exceed 100 dB, referenced
to full output. IHF damping factor shall exceed 200 with an 8-ohm load.
The amplifier chassis shall occupy three rack spaces and have provisions
for securing the rear corners. Depth from mounting surface to tips of rear
supports shall be 15.9" (40.4 cm).
The amplifier's weight shall not exceed 44 lb. (20 kg). The amplifier shall
be the QSC Audio Products ISA 300Ti.
TOP
ISA 450
ARCHITECT'S AND ENGINEER'S SPECIFICATIONS
The amplifier shall contain all solid-state circuitry, using complementary
silicon output devices. The amplifier shall operate from 50-60 Hz AC power.
The amplifier shall draw 720 VA or less when driven with random program
material at 1/8 rated power into four-ohm loads. The amplifier shall be
equipped with a 320-C19 16A IEC mains connector and a removable power cord.
Units configured for 120V use shall have a 15A circuit breaker on the rear
panel and operate safely from a 15A 120V AC outlet, and their power cords
shall have a standard NEMA AC plug. Units configured for 230V use shall
have an 8A circuit breaker on the rear panel and shall have a power cord
with a standard Schuko AC plug. The amplifier shall comply with FCC part
15 Class B requirements.
The amplifier shall employ forced-air cooling with a temperature-controlled
fan, variable in speed from zero to full for minimum acoustic noise. Airflow
shall be from rear to front to avoid temperature rise inside the rack. Rack
mounting shall be possible without clearance between amplifiers for ventilation.
The amplifier shall be capable of continuous operation at 1/3 power into
four-ohm loads, in ambient temperatures up to 104°F (40°C).
The amplifier shall contain two independent amplifier channels powered by
a conventional power supply with a toroidal transformer. All amplifier protection
systems shall be synchronized and self-resetting upon removal of fault.
Each channel shall have circuitry to protect against short circuits or mismatched
loads. Each channel shall independently monitor heat sink temperature to
control the fan speed and if necessary, mute the signal to prevent excessive
temperature. Both channels shall mute for several seconds after turn-on,
and within 1/4 second after turn-off or loss of AC power.
Each channel's output section shall be AC coupled to protect the load against
DC faults. Each channel shall have an independent and defeatable clip limiter
and 12 dB per octave high-pass filter. The corner frequency of the filter
shall be selectable between 30 and 70 Hz. Each channel's output section
shall operate in Class AB+B.
The front panel shall contain these features: an AC power switch; a green
LED status indicator for power; independent LED channel output indicators
for signal present or -30 dB (green), and clip (red). The gain controls
shall be located on the rear panel and have 11 detents. They shall be labeled
in dB of attenuation, from 0 to infinity. From 0 to 14 dB, the attenuation
steps shall be 2 dB per detent. The labeled attenuation settings shall be
0, 4, 10, 18, 25, and ∞ dB. The output connector for both channels
shall be a barrier strip located on the rear panel, with screw terminals
and a safety shroud. The terminals shall be arranged to facilitate bridged
mono connection.
The inputs shall be located on the rear panel, consisting of a 3-pin detachable
terminal block and a 3-pin XLR connector for each channel. The XLR input
shall be wired with pin 2 high. Inputs shall be electronically balanced,
with a minimum impedance of 20 kilohms balanced and 10 kilohms unbalanced,
and a common mode rejection of at least 50 dB from 20 Hz to 20 kHz.
A High Density 15-pin DataPort connector shall be provided for carrying
both audio and amplifier operational status signals to and from a QSControl
network. The DataPort shall also accommodate plug-in crossover filters and
other such accessories. A set of DIP switches on the rear panel shall be
provided for: setting bridged mono and parallel-input operation; selecting
clip limiters; and selecting high-pass filters and setting their frequencies.
Each channel shall be capable of meeting the following performance criteria
with both channels driven: Sine-wave output power of 260 watts into 8 ohms,
20 Hz to 20 kHz at <0.03% THD; 425 watts into 4 ohms, 20 Hz to 20 kHz
at <0.05% THD; and 700 watts into 2 ohms, 1 kHz at <1% THD.
Frequency response (with filters not engaged) at 3 dB below rated power
shall be 20 Hz to 20 kHz ±0.2 dB. The maximum voltage gain shall
be 44.7x, equivalent to 33 dB, and the 8-ohm input sensitivity shall be
1.07 Vrms (+2.8 dBu). The unweighted signal to noise ratio over the range
of 20 Hz to 20 kHz shall exceed 100 dB, referenced to full output. IHF damping
factor shall exceed 200 with an 8-ohm load.
The amplifier chassis shall occupy three rack spaces and have provisions
for securing the rear corners. Depth from mounting surface to tips of rear
supports shall be 15.9" (40.4 cm).
The amplifier's weight shall not exceed 42 lb. (19 kg). The amplifier shall
be the QSC Audio Products ISA 450.
TOP
ISA 500Ti
ARCHITECT'S AND ENGINEER'S SPECIFICATIONS
The amplifier shall contain all solid-state circuitry, using complementary
silicon output devices. The amplifier shall operate from 50-60 Hz AC power.
The amplifier shall draw 720 VA or less when driven with random program
material at 1/8 rated power into four-ohm loads. The amplifier shall be
equipped with a 320-C19 16A IEC mains connector and a removable power cord.
Units configured for 120V use shall have a 15A circuit breaker on the rear
panel and operate safely from a 15A 120V AC outlet, and their power cords
shall have a standard NEMA AC plug. Units configured for 230V use shall
have an 8A circuit breaker on the rear panel and shall have a power cord
with a standard Schuko AC plug. The amplifier shall comply with FCC part
15 Class B requirements.
The amplifier shall employ forced-air cooling with a temperature-controlled
fan, variable in speed from zero to full for minimum acoustic noise. Airflow
shall be from rear to front to avoid temperature rise inside the rack. Rack
mounting shall be possible without clearance between amplifiers for ventilation.
The amplifier shall be capable of continuous operation at 1/3 power into
four-ohm loads, in ambient temperatures up to 104°F (40°C).
The amplifier shall contain two independent amplifier channels powered by
a conventional power supply with a toroidal transformer. All amplifier protection
systems shall be synchronized and self-resetting upon removal of fault.
Each channel shall have circuitry to protect against short circuits or mismatched
loads. Each channel shall independently monitor heat sink temperature to
control the fan speed and if necessary, mute the signal to prevent excessive
temperature. Both channels shall mute for several seconds after turn-on,
and within 1/4 second after turn-off or loss of AC power. Each channel's
output section shall be AC coupled to protect the load against DC faults.
Each channel shall have an independent and defeatable clip limiter and a
12 dB per octave high-pass filter. The corner frequency of the filter shall
be selectable between 50 and 75 Hz. Each channel's output section shall
operate in Class AB+B.
The front panel shall contain these features: an AC power switch; a green
LED status indicator for power; independent LED channel output indicators
for signal present or -30 dB (green), and clip (red). The gain controls
shall be located on the rear panel and have 11 detents. They shall be labeled
in dB of attenuation, from 0 to infinity. From 0 to 14 dB, the attenuation
steps shall be 2 dB per detent. The labeled attenuation settings shall be
0, 4, 10, 18, 25, and ∞ dB.
The amplifier shall be designed to drive load impedances as low as 2 ohms
per channel, and each output shall have an internal toroidal transformer
with taps at 25, 70, and 100 volts for driving distributed lines. The output
connectors for both channels shall be barrier strips located on the rear
panel, with screw terminals and a safety shroud. There shall be terminals
for both low-impedance and 25-, 70-, and 100-volt operation.
The inputs shall be located on the rear panel, consisting of a 3-pin detachable
terminal block and a 3-pin XLR connector for each channel. The XLR input
shall be wired with pin 2 high. Inputs shall be electronically balanced,
with a minimum impedance of 20 kilohms balanced and 10 kilohms unbalanced,
and a common mode rejection of at least 50 dB from 20 Hz to 20 kHz.
A High Density 15-pin DataPort connector shall be provided for carrying
both audio and amplifier operational status signals to and from a QSControl
network. The DataPort shall also accommodate plug-in crossover filters and
other such accessories. A set of DIP switches on the rear panel shall be
provided for: setting bridged mono and parallel-input operation; selecting
clip limiters; and selecting high-pass filters and setting their frequencies.
Each channel shall be capable of meeting the following performance criteria
with both channels driven: Sine-wave output power of 260 watts into 8 ohms,
20 Hz to 20 kHz at <0.03% THD; 425 watts into 4 ohms, 20 Hz to 20 kHz
at <0.05% THD; 700 watts into 2 ohms, 1 kHz at <1% THD; 500 watts
at 70 or 100 volts, 50 Hz to 16 kHz at <0.5% THD, and 300 watts at 25
volts, 50 Hz to 16 kHz at <0.5% THD.
Frequency response (with filters not engaged) at 3 dB below rated power
shall be 20 Hz to 20 kHz ±0.2 dB. The maximum voltage gain at the
low-impedance outputs shall be 44.x, equivalent to 33 dB, and the 8-ohm
input sensitivity shall be 1.07 Vrms (+2.8 dBu). The unweighted signal to
noise ratio over the range of 20 Hz to 20 kHz shall exceed 100 dB, referenced
to full output. IHF damping factor shall exceed 200 with an 8-ohm load.
The amplifier chassis shall occupy three rack spaces and have provisions
for securing the rear corners. Depth from mounting surface to tips of rear
supports shall be 15.9" (40.4 cm).
The amplifier's weight shall not exceed 49 lb. (22.3 kg). The amplifier
shall be the QSC Audio Products ISA 500Ti.
TOP
ISA 750
ARCHITECT'S AND ENGINEER'S SPECIFICATIONS
The amplifier shall contain all solid-state circuitry, using complementary
silicon output devices. The amplifier shall operate from 50-60 Hz AC power.
The amplifier shall draw 760 VA or less when driven with random program
material at 1/8 rated power into four-ohm loads. The amplifier shall be
equipped with a 320-C19 16A IEC mains connector and a removable power cord.
Units configured for 120V use shall have a 15A circuit breaker on the rear
panel and operate safely from a 15A 120V AC outlet, and their power cords
shall have a standard NEMA AC plug. Units configured for 230V use shall
have an 8A circuit breaker on the rear panel and shall have a power cord
with a standard Schuko AC plug. The amplifier shall comply with FCC part
15 Class B requirements.
The amplifier shall employ forced-air cooling with a temperature-controlled
fan, variable in speed from zero to full for minimum acoustic noise. Air
flow shall be from rear to front to avoid temperature rise inside the rack.
Rack mounting shall be possible without clearance between amplifiers for
ventilation. The amplifier shall be capable of continuous operation at 1/3
power into four-ohm loads, in ambient temperatures up to 104°F (40°C).
The amplifier shall contain two independent amplifier channels powered by
a conventional power supply with a toroidal transformer. All amplifier protection
systems shall be synchronized and self-resetting upon removal of fault.
Each channel shall have circuitry to protect against short circuits or mismatched
loads. Each channel shall independently monitor heat sink temperature to
control the fan speed and if necessary, mute the signal to prevent excessive
temperature. Both channels shall mute for several seconds after turn-on,
and within 1/4 second after turn-off or loss of AC power.
Each channel's output section shall be AC coupled to protect the load against
DC faults. Each channel shall have an independent and defeatable clip limiter
and 12 dB per octave high-pass filter. The corner frequency of the filter
shall be selectable between 30 and 70 Hz. Each channel's output section
shall feature a two-tier Class H high-efficiency circuit.
The front panel shall contain these features: an AC power switch; a green
LED status indicator for power; independent LED channel output indicators
for signal present or -30 dB (green), and clip (red). The gain controls
shall be located on the rear panel and have 11 detents. They shall be labeled
in dB of attenuation, from 0 to infinity. From 0 to 14 dB, the attenuation
steps shall be 2 dB per detent. The labeled attenuation settings shall be
0, 4, 10, 18, 25, and ∞ dB. The output connector for both channels
shall be a barrier strip located on the rear panel, with screw terminals
and a safety shroud. The terminals shall be arranged to facilitate bridged
mono connection.
The inputs shall be located on the rear panel, consisting of a 3-pin detachable
terminal block and a 3-pin XLR connector for each channel. The XLR input
shall be wired with pin 2 high. Inputs shall be electronically balanced,
with a minimum impedance of 20 kilohms balanced and 10 kilohms unbalanced,
and a common mode rejection of at least 50 dB from 20 Hz to 20 kHz.
A High Density 15-pin DataPort connector shall be provided for carrying
both audio and amplifier operational status signals to and from a QSControl
network. The DataPort shall also accommodate plug-in crossover filters and
other such accessories. A set of DIP switches on the rear panel shall be
provided for: setting bridged mono and parallel-input operation; selecting
clip limiters; and selecting high-pass filters and setting their frequencies.
Each channel shall be capable of meeting the following performance criteria
with both channels driven: Sine-wave output power of 450 watts into 8 ohms,
20 Hz to 20 kHz at <0.03% THD; 650 watts into 4 ohms, 20 Hz to 20 kHz
at <0.05% THD; and 1200 watts into 2 ohms, 1 kHz at <1% THD.
Frequency response (with filters not engaged) at 3 dB below rated power
shall be 20 Hz to 20 kHz ±0.2 dB. The maximum voltage gain shall
be 56.2x, equivalent to 35 dB, and the 8-ohm input sensitivity shall be
1.07 Vrms (+2.8 dBu). The unweighted signal to noise ratio over the range
of 20 Hz to 20 kHz shall exceed 100 dB, referenced to full output. IHF damping
factor shall exceed 200 with an 8-ohm load.
The amplifier chassis shall occupy three rack spaces and have provisions
for securing the rear corners. Depth from mounting surface to tips of rear
supports shall be 15.9" (40.4 cm).
The amplifier's weight shall not exceed 47 lb. (21.3 kg). The amplifier
shall be the QSC Audio Products ISA 750.
TOP
ISA 800Ti
ARCHITECT'S AND ENGINEER'S SPECIFICATIONS
The amplifier shall contain all solid-state circuitry, using complementary
silicon output devices. The amplifier shall operate from 50-60 Hz AC power.
The amplifier shall draw 760 VA or less when driven with random program
material at 1/8 rated power into four-ohm loads. The amplifier shall be
equipped with a 320-C19 16A IEC mains connector and a removable power cord.
Units configured for 120V use shall have a 15A circuit breaker on the rear
panel and operate safely from a 15A 120V AC outlet, and their power cords
shall have a standard NEMA AC plug. Units configured for 230V use shall
have an 8A circuit breaker on the rear panel and shall have a power cord
with a standard Schuko AC plug. The amplifier shall comply with FCC part
15 Class B requirements.
The amplifier shall employ forced-air cooling with a temperature-controlled
fan, variable in speed from zero to full for minimum acoustic noise. Air
flow shall be from rear to front to avoid temperature rise inside the rack.
Rack mounting shall be possible without clearance between amplifiers for
ventilation. The amplifier shall be capable of continuous operation at 1/3
power into four-ohm loads, in ambient temperatures up to 104°F (40°C).
The amplifier shall contain two independent amplifier channels powered by
a conventional power supply with a toroidal transformer. All amplifier protection
systems shall be synchronized and self-resetting upon removal of fault.
Each channel shall have circuitry to protect against short circuits or mismatched
loads. Each channel shall independently monitor heat sink temperature to
control the fan speed and if necessary, mute the signal to prevent excessive
temperature. Both channels shall mute for several seconds after turn-on,
and within 1/4 second after turn-off or loss of AC power.
Each channel's output section shall be AC coupled to protect the load against
DC faults. Each channel shall have an independent and defeatable clip limiter
and a 12 dB per octave high-pass filter. The corner frequency of the filter
shall be selectable between 50 and 75 Hz. Each channel's output section
shall feature a two-tier Class H high-efficiency circuit.
The front panel shall contain these features: an AC power switch; a green
LED status indicator for power; independent LED channel output indicators
for signal present or -30 dB (green), and clip (red). The gain controls
shall be located on the rear panel and have 11 detents. They shall be labeled
in dB of attenuation, from 0 to infinity. From 0 to 14 dB, the attenuation
steps shall be 2 dB per detent. The labeled attenuation settings shall be
0, 4, 10, 18, 25, and ∞ dB. The amplifier shall be designed to drive
load impedances as low as 2 ohms per channel, and each output shall have
an internal toroidal transformer with taps at 25, 70, and 100 volts for
driving distributed lines. The output connectors for both channels shall
be barrier strips located on the rear panel, with screw terminals and a
safety shroud. There shall be terminals for both low-impedance and 25-,
70-, and 100-volt operation.
The inputs shall be located on the rear panel, consisting of a 3-pin detachable
terminal block and a 3-pin XLR connector for each channel. The XLR input
shall be wired with pin 2 high. Inputs shall be electronically balanced,
with a minimum impedance of 20 kilohms balanced and 10 kilohms unbalanced,
and a common mode rejection of at least 50 dB from 20 Hz to 20 kHz. A High
Density 15-pin DataPort connector shall be provided for carrying both audio
and amplifier operational status signals to and from a QSControl network.
The DataPort shall also accommodate plug-in crossover filters and other
such accessories. A set of DIP switches on the rear panel shall be provided
for: setting bridged mono and parallel-input operation; selecting clip limiters;
and selecting high-pass filters and setting their frequencies.
Each channel shall be capable of meeting the following performance criteria
with both channels driven: Sine-wave output power of 450 watts into 8 ohms,
20 Hz to 20 kHz at <0.03% THD; 650 watts into 4 ohms, 20 Hz to 20 kHz
at <0.05% THD; 1200 watts into 2 ohms, 1 kHz at <1% THD; 800 watts
at 70 or 100 volts, 50 Hz to 16 kHz at <0.5% THD, and 500 watts at 25
volts, 50 Hz to 16 kHz at <0.5% THD.
Frequency response (with filters not engaged) at 3 dB below rated power
shall be 20 Hz to 20 kHz ±0.2 dB. The maximum voltage gain at the
low-impedance outputs shall be 56.2x, equivalent to 35 dB, and the 8-ohm
input sensitivity shall be 1.07 Vrms (+2.8 dBu). The unweighted signal to
noise ratio over the range of 20 Hz to 20 kHz shall exceed 100 dB, referenced
to full output. IHF damping factor shall exceed 200 with an 8-ohm load.
The amplifier chassis shall occupy three rack spaces and have provisions
for securing the rear corners. Depth from mounting surface to tips of rear
supports shall be 15.9" (40.4 cm).
The amplifier's weight shall not exceed 57 lb. (26 kg). The amplifier shall
be the QSC Audio Products ISA 800Ti.
TOP
ISA 1350
ARCHITECT'S AND ENGINEER'S SPECIFICATIONS
The amplifier shall contain all solid-state circuitry, using complementary
silicon output devices. The amplifier shall operate from 50-60 Hz AC power.
The amplifier shall draw 1200 VA or less when driven with random program
material at 1/8 rated power into four-ohm loads. The amplifier shall be
equipped with a 320-C19 16A IEC mains connector and a removable power cord.
Units configured for 120V use shall have two 15A circuit breakers on the
rear panel and operate safely from a 15A 120V AC outlet, and their power
cords shall have a standard NEMA AC plug. Units configured for 230V use
shall have two 8A circuit breakers on the rear panel and shall have a power
cord with a standard Schuko AC plug. The amplifier shall comply with FCC
part 15 Class B requirements.
The amplifier shall employ forced-air cooling with a temperature-controlled
fan, variable in speed from zero to full for minimum acoustic noise. Air
flow shall be from rear to front to avoid temperature rise inside the rack.
Rack mounting shall be possible without clearance between amplifiers for
ventilation. The amplifier shall be capable of continuous operation at 1/3
power into four-ohm loads, in ambient temperatures up to 104°F (40°C).
The amplifier shall contain two independent amplifier channels powered by
a conventional power supply with a toroidal transformer. All amplifier protection
systems shall be synchronized and self-resetting upon removal of fault.
Each channel shall have circuitry to protect against short circuits or mismatched
loads. Each channel shall independently monitor heat sink temperature to
control the fan speed and if necessary, mute the signal to prevent excessive
temperature. Both channels shall mute for several seconds after turn-on,
and within 1/4 second after turn-off or loss of AC power.
Each channel's output section shall be AC coupled to protect the load against
DC faults. Each channel shall have an independent and defeatable clip limiter
and 12 dB per octave high-pass filter. The corner frequency of the filter
shall be selectable between 30 and 70 Hz. Each channel's output section
shall feature a three-tier Class H high-efficiency circuit.
The front panel shall contain these features: an AC power switch; a green
LED status indicator for power; independent LED channel output indicators
for signal present or -30 dB (green), and clip (red). The gain controls
shall be located on the rear panel and have 11 detents. They shall be labeled
in dB of attenuation, from 0 to infinity. From 0 to 14 dB, the attenuation
steps shall be 2 dB per detent. The labeled attenuation settings shall be
0, 4, 10, 18, 25, and ∞ dB.
The output connector for both channels shall be a barrier strip located
on the rear panel, with screw terminals and a safety shroud. The terminals
shall be arranged to facilitate bridged mono connection.
The inputs shall be located on the rear panel, consisting of a 3-pin detachable
terminal block and a 3-pin XLR connector for each channel. The XLR input
shall be wired with pin 2 high. Inputs shall be electronically balanced,
with a minimum impedance of 20 kilohms balanced and 10 kilohms unbalanced,
and a common mode rejection of at least 50 dB from 20 Hz to 20 kHz.
A High Density 15-pin DataPort connector shall be provided for carrying
both audio and amplifier operational status signals to and from a QSControl
network. The DataPort shall also accommodate plug-in crossover filters and
other such accessories. A set of DIP switches on the rear panel shall be
provided for: setting bridged mono and parallel-input operation; selecting
clip limiters; and selecting high-pass filters and setting their frequencies.
Each channel shall be capable of meeting the following performance criteria
with both channels driven: Sine-wave output power of 800 watts into 8 ohms,
20 Hz to 20 kHz at <0.03% THD; 1300 watts into 4 ohms, 20 Hz to 20 kHz
at <0.05% THD; and 2000 watts into 2 ohms, 1 kHz at <1% THD.
Frequency response (with filters not engaged) at 3 dB below rated power
shall be 20 Hz to 20 kHz ±0.2 dB. The maximum voltage gain shall
be 64x, equivalent to 36 dB, and the 8-ohm input sensitivity shall be 1.24
Vrms (+4.1 dBu). The unweighted signal to noise ratio over the range of
20 Hz to 20 kHz shall exceed 100 dB, referenced to full output. IHF damping
factor shall exceed 200 with an 8-ohm load.
The amplifier chassis shall occupy three rack spaces and have provisions
for securing the rear corners. Depth from mounting surface to tips of rear
supports shall be 15.9" (40.4 cm).
The amplifier's weight shall not exceed 68 lb. (30.8 kg). The amplifier
shall be the QSC Audio Products ISA 1350.
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ARCHITECT'S
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