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Architect's & Engineer's Specifications
CX 4-Channel Series
CX 254
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 1125 VA or less when driven with random program
material at 1/8 rated power into four-ohm loads. The amplifier shall equipped
with a 320-C19 16A IEC mains connector and a removable power cord. Units
configured for 120V use shall 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 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 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 four independent amplifier channels powered
by a low-impedance switching power supply. 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 and shall
trigger fan speed boost, and if necessary, signal muting to prevent excessive
temperature rise. All channels shall have synchronized on-off muting, acting
for three seconds after turn-on, and within ¼ second after turn-off
or loss of AC power. Each channel shall have DC fault protection for the
load, consisting of a shutdown of the power supply. 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 33
and 75 Hz.
The front panel shall contain these features: an AC power switch; LED status
indicators for power (green), bridged mono (yellow), and parallel inputs
(yellow); independent LED output metering indicators for each channel for
signal present or -30 dB (green), -20 dB (green), -10 dB (green), and clip
(red); and a recessed, detented gain control for each channel with 21 attenuation
settings. From 0 to 14 dB, the attenuation steps shall be 1-dB increments.
The labeled attenuation settings shall be 0, 2, 4, 6, 8, 10, 12, 14, 18,
24, and ∞ dB. The 0 dB attenuation settings shall also be labeled
with the amplifier's equivalent voltage gain in dB. A removable security
panel shall be provided for covering and preventing unauthorized access
to the gain controls, when needed.
The output connectors shall be two barrier strips located on the rear panel,
with screw terminals and a safety shroud. One barrier strip shall be used
for channels 1 and 2, and the other for channels 3 and 4. 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 for each channel. Inputs shall be electronically balanced,
with a minimum impedance of 12 kilohms balanced and 6 kilohms unbalanced,
and a common mode rejection of at least 50 dB from 20 Hz to 20 kHz.
On the rear panel, each pair of channels-1 with 2, and 3 with 4-shall have
a High Density 15-pin DataPort connector for carrying both audio and amplifier
operational status signals to and from a QSControl network, as well as a
set of DIP switches 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 all channels driven: Sine-wave output power of 170 watts into 8 ohms,
20 Hz to 20 kHz at <0.03% THD; 250 watts into 4 ohms, 20 Hz to 20 kHz
at <0.05% THD; and 450 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 voltage gain shall be 29, equivalent to
29 dB, and the input sensitivity shall be 1.28 Vrms (+4.4 dBu). The unweighted
signal to noise ratio over the range of 20 Hz to 20 kHz shall exceed 106
dB, referenced to full output. IHF damping factor shall exceed 500.
The amplifier chassis shall occupy two rack spaces and have provisions for
securing the rear corners. Depth from mounting surface to tips of rear supports
shall be 14" (35.6 cm).
The amplifier's weight shall not exceed 21 lb. (9.5 kg). The amplifier shall
be the QSC Audio Products CX 254.
TOP
CX 404
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 975 VA or less when driven with random program
material at 1/8 rated power into eight-ohm loads. The amplifier shall equipped
with a 320-C19 16A IEC mains connector and a removable power cord. Units
configured for 120V use shall 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 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 four independent amplifier channels powered
by a low-impedance switching power supply. 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 and shall
trigger fan speed boost, and if necessary, signal muting to prevent excessive
temperature rise. All channels shall have synchronized on-off muting, acting
for three seconds after turn-on, and within ¼ second after turn-off
or loss of AC power. Each channel shall have DC fault protection for the
load, consisting of a shutdown of the power supply. 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 33
and 75 Hz.
The front panel shall contain these features: an AC power switch; LED status
indicators for power (green), bridged mono (yellow), and parallel inputs
(yellow); independent LED output metering indicators for each channel for
signal present or -30 dB (green), -20 dB (green), -10 dB (green), and clip
(red); and a recessed, detented gain control for each channel with 21 attenuation
settings. From 0 to 14 dB, the attenuation steps shall be 1-dB increments.
The labeled attenuation settings shall be 0, 2, 4, 6, 8, 10, 12, 14, 18,
24, and ∞ dB. The 0 dB attenuation settings shall also be labeled
with the amplifier's equivalent voltage gain in dB. A removable security
panel shall be provided for covering and preventing unauthorized access
to the gain controls, when needed.
The output connectors shall be two barrier strips located on the rear panel,
with screw terminals and a safety shroud. One barrier strip shall be used
for channels 1 and 2, and the other for channels 3 and 4. 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 for each channel. Inputs shall be electronically balanced,
with a minimum impedance of 12 kilohms balanced and 6 kilohms unbalanced,
and a common mode rejection of at least 50 dB from 20 Hz to 20 kHz.
On the rear panel, each pair of channels-1 with 2, and 3 with 4-shall have
a High Density 15-pin DataPort connector for carrying both audio and amplifier
operational status signals to and from a QSControl network, as well as a
set of DIP switches 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 all channels driven: Sine-wave output power of 250 watts into 8 ohms,
20 Hz to 20 kHz at <0.03% THD, and 450 watts into 4 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 voltage gain shall be 36.5,
equivalent to 31 dB, and the input sensitivity shall be 1.22 Vrms (+3.9
dBu). The unweighted signal to noise ratio over the range of 20 Hz to 20
kHz shall exceed 106 dB, referenced to full output. IHF damping factor shall
exceed 500.
The amplifier chassis shall occupy two rack spaces and have provisions for
securing the rear corners. Depth from mounting surface to tips of rear supports
shall be 14" (35.6 cm).
The amplifier's weight shall not exceed 21 lb. (9.5 kg). The amplifier shall
be the QSC Audio Products CX 404.
TOP
CX 204V
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 925 VA or less when driven with random program
material at 1/8 rated power into equivalent 70-volt loads (25 ohms). The
amplifier shall equipped with a 320-C19 16A IEC mains connector and a removable
power cord. Units configured for 120V use shall 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 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 at 70 volts output, in ambient temperatures up to 104°F (40°C).
The amplifier shall contain four independent amplifier channels powered
by a low-impedance switching power supply. 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 and shall
trigger fan speed boost, and if necessary, signal muting to prevent excessive
temperature rise. All channels shall have synchronized on-off muting, acting
for three seconds after turn-on, and within ¼ second after turn-off
or loss of AC power. Each channel shall have DC fault protection for the
load, consisting of a shutdown of the power supply. 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 50
and 75 Hz.
The front panel shall contain these features: an AC power switch; LED status
indicators for power (green), bridged mono (yellow), and parallel inputs
(yellow); independent LED output metering indicators for each channel for
signal present or -30 dB (green), -20 dB (green), -10 dB (green), and clip
(red); and a recessed, detented gain control for each channel with 21 attenuation
settings. From 0 to 14 dB, the attenuation steps shall be 1-dB increments.
The labeled attenuation settings shall be 0, 2, 4, 6, 8, 10, 12, 14, 18,
24, and ∞ dB. The 0 dB attenuation settings shall also be labeled
with the amplifier's equivalent voltage gain in dB. A removable security
panel shall be provided for covering and preventing unauthorized access
to the gain controls, when needed.
The output connectors shall be two barrier strips located on the rear panel,
with screw terminals and a safety shroud. One barrier strip shall be used
for channels 1 and 2, and the other for channels 3 and 4. 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 for each channel. Inputs shall be electronically balanced,
with a minimum impedance of 12 kilohms balanced and 6 kilohms unbalanced,
and a common mode rejection of at least 50 dB from 20 Hz to 20 kHz.
On the rear panel, each pair of channels-1 with 2, and 3 with 4-shall have
a High Density 15-pin DataPort connector for carrying both audio and amplifier
operational status signals to and from a QSControl network, as well as a
set of DIP switches 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 all channels driven: 70-volt sine-wave output power of 200 watts, 20
Hz to 20 kHz at <0.05% THD, and of 220 watts, 1 kHz at <0.1% THD.
Each channel shall be capable of driving directly a 70-volt line at rated
power, without requiring an output transformer. Frequency response (with
filters not engaged) at 3 dB below rated power shall be 20 Hz to 20 kHz
±0.2 dB. The voltage gain shall be 56.6, equivalent to 35 dB, and
the input sensitivity shall be 1.26 Vrms (+4.2 dBu). The unweighted signal
to noise ratio over the range of 20 Hz to 20 kHz shall exceed 106 dB, referenced
to full output. IHF damping factor shall exceed 500.
The amplifier chassis shall occupy two rack spaces and have provisions for
securing the rear corners. Depth from mounting surface to tips of rear supports
shall be 14" (35.6 cm).
The amplifier's weight shall not exceed 21 lb. (9.5 kg). The amplifier shall
be the QSC Audio Products CX 204V.
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ARCHITECT'S
AND ENGINEER'S SPECIFICATIONS
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Series Architect's & Engineer's Specifications (PDF 139k)
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