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Architect's & Engineer's Specifications
CX 8-Channel Series
CX 168
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 1104 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 eight 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. A failure
in any channel shall not interrupt operation of the others.
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 1/4 second after
turn-off or loss of AC power. Each channel shall have DC blocking for the
load. 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 and an
LED status indicator for power (green); an LED status indicator for bridged
mono (yellow), and parallel inputs (yellow) on each channel pair; LED output
indicators for each channel for signal present or -35 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, 7, 12, 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 for all channels shall be detachable terminal strips,
located on the rear panel, with screw terminals. 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.
For each channel pair, 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.
Also for each channel pair, 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 all channels driven: Sine-wave output power of 90 watts into 8 ohms,
20 Hz to 20 kHz at <0.1% THD; and 120 watts into 4 ohms, 20 Hz to 20
kHz at <0.1% 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 20, equivalent to 26 dB, and the input sensitivity shall be
1.35 Vrms (+4.8 dBu). The unweighted signal to noise ratio over the range
of 20 Hz to 20 kHz shall exceed 107 dB, referenced to full output. IHF damping
factor shall exceed 200.
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 168.
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CX 108V
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 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 eight independent amplifier channels, each capable
of directly driving a 70-volt distributed speaker line, powered by a low-impedance
switching power supply. All amplifier protection systems shall be synchronized
and self-resetting upon removal of fault. A failure in any channel shall
not interrupt operation of the others.
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 1/4 second after
turn-off or loss of AC power. Each channel shall have DC blocking for the
load. 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 and an
LED status indicator for power (green); an LED status indicator for bridged
mono (yellow), and parallel inputs (yellow) on each channel pair; LED output
indicators for each channel for signal present or -35 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, 7, 12, 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 for all channels shall be detachable terminal strips,
located on the rear panel, with screw terminals. 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.
For each channel pair, 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.
Also for each channel pair, 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 providing sine-wave output power of 100
watts at 70 volts, 20 Hz to 20 kHz at <0.2% THD, with all channels driven.
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 50, equivalent
to 35 dB, and the input sensitivity shall be 1.41 Vrms (+5.2 dBu). The unweighted
signal to noise ratio over the range of 20 Hz to 20 kHz shall exceed 107
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 108V.
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ARCHITECT'S
AND ENGINEER'S SPECIFICATIONS
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