QSC CX-6-T Brochure

CX6T

FEATURES

Toroidal Output Transformers—
Provide Full Electrical Isolation and
Meet Worldwide Safety Agency
Approval

Automatic T wo-Speed, High
Efficiency Fan Cooling—For Quiet
Normal Operation with Maximum
Cooling on Demand

Rear-to-Front Air Flow—Keeps
Equipment Racks Cool

Front Panel Status LED’s—Indicate
Clip, Protect, Power and Signal
Presence

Rear Panel Detented Gain Controls—
For Security and Resetability

Open Input Architecture™—Flexible
Input Options

Detachable Euro-Style Barrier Strip
Input—Easy and Economical
Connections

he CX6T amplifier is ideal for use in any permanently
installed sound system. Designed to meet the spe­cialized needs of high power , high quality audio sys­tems, the CX6T offers the features requested most
by contractors and installers from around the world.
The CX6T resides in a rugged three rack-space steel
chassis approximately 17.9 inches deep. With high
quality internal isolation transformers, the CX6T fea­tures built-in capability for driving 25, 70 or 100 volt
distributed sound systems as well as direct output
voice coil loads. Versatile design allows a 25, 70 or

LOAD OUTPUT POWER (Direct Outputs) OUTPUT POWER (Isolated Outputs)

45Hz-20kHz, 0.1% THD 1kHz, 1% THD 1 kHz, 0.1% THD

Stereo (W/Ch)

8Ω 200 watts 220 watts
4Ω 300 watts 350 watts
2Ω 450 watts*

25 volts 200 watts
70 volts 250 watts

100 volts 250 watts

Mono-Bridged

16Ω 400 watts 440 watts

8Ω 600 watts 700 watts
4Ω 900 watts*

50 volts 400 watts
140 volts 500 watts
200 volts 500 watts

100 volt connection on one channel and a direct
connection on the other channel. For maximum flex­ibility, you can even drive a distributed line and a
low impedance load on the same channel at the
same time! The CX6T features a built-in 45 Hz sub­sonic filter that reduces saturation of speaker trans­formers caused by excessively low frequencies. High
output power, versatile loading options, high ther­mal capacity and rugged reliability make the CX
amplifiers ideal for any high quality sound system
installation.

Stereo, Bridge, or Parallel Operating
Modes—Switch Selectable

Double Thickness Rack Ears—For
Extra Strength

Covered Barrier Strip Output
Connections—Meets Safety Agency
Requirements

Simple Barrier Strip Connection
Determines Output Mode—25 V , 70 V ,
100 V and Direct Outputs Available
Simultaneously

Built-in 45 Hz Subsonic Filter—
Prevents Speaker Transformer
Saturation With Minimal Effect on
Program Material

1675 MacArthur Boulevard
Costa Mesa, California 92626-1468 USA
Phone: [phone] Fax: [phone]

*typical

POWER OUTPUT

Direct output, watts per channel, both channels driven

8Ω, 45 Hz-20 kHz, 0.1% THD 200
8Ω, 1 kHz, 1% THD 220
4Ω, 45 Hz-20 kHz, 0.1% THD 300
4Ω, 1 kHz, 1% THD 350
2Ω, 1 kHz, 1% THD* 450

Isolated outputs, watts per channel, both channels driven

70V or 100V, 1 kHz, 0.1% THD 250
25V, 1 kHz, 0.1% THD 200

Direct Outputs, bridged mono

8Ω, 45 Hz-20 kHz, 0.1% THD 600
4Ω, 1 kHz, 1% THD* 900

Isolated outputs, bridged mono

50V, 1 kHz, 0.1% THD 400
140V, 1 kHz, 0.1% THD 500
200V, 1 kHz, 0.1% THD 500

DISTORTION SMPTE-IM, less than 0.05%, direct outputs
FREQUENCY RESPONSE

Direct outputs: -3 dB @ 45 Hz*, -0.2 dB @ 20 kHz
Isolated outputs: 45 Hz*-16 kHz, +0, -3 dB

* Low frequency response is limited by 18 dB/octave 45-Hz high-pass filter.

DAMPING FACTOR 200 (@ direct outputs)
OUTPUT REGULATION 100V–1.0 dB; 70V–1.1 dB; 25V–2.0 dB
NOISE 100 dB below rated output (20 Hz to 20 kHz)
VOLTAGE GAIN

@ direct outputs 40x (32 dB)

INPUT SENSITIVITY, VRMS

for rated power, 8Ω 1.02

INPUT IMPEDANCE 10K unbalanced, 20K balanced
CONTROLS

CX6T Specifications

Front: AC Switch
Rear: Parallel/Stereo/Bridge Switch,
Ch.1 and Ch. 2 Attenuator Knobs (11 detents: 0, -2, -4, -6, -8, -10, -12, -14, -18, -24, off)

FRONT PANEL/INDICATORS (per channel)

PROTECT: Red LED
CLIP: Red LED
SIGNAL: Yellow LED
POWER: Green LED

REAR PANEL/CONNECTORS (each channel)

Input: Euro-style detachable header
Output: Covered barrier strips

COOLING 2-speed fan, with back-to-front air flow
AMPLIFIER PROTECTION

Output Averaging™ short circuit protection, open circuit, ultrasonic, RF, thermal muting
Stable into reactive or mismatched loads

LOAD PROTECTION Turn-on/turn-off muting, DC-fault load grounding relay with internal fault fuses
OUTPUT CIRCUIT TYPE Class AB complementary linear stage
POWER REQUIREMENTS: 100, 120, 220-240 VAC, 50/60 Hz

POWER CONSUMPTION

Normal operation: 1/8 power @ 4Ω per channel
Worst case continuous program: 1/3 power @ 2Ω per channel
Maximum: full power @ 2Ω per channel
Multiply current by 0.5 for 220-240 VAC operation

Channel Load AC Current, Full Power AC Current, 1/3 Power AC Current, 1/8 Power AC Current, Idle

8Ω + 8Ω 7.7 A 4.9 A 3.3 A 0.6 A
4Ω + 4Ω 12.5 A 7.4 A 4.8 A 0.6 A
2Ω + 2Ω 18.8 A 11.0 A 7.2 A 0.6 A

25V, 70V, 100V 11.2 A 6.7 A 4.5 A 0.6 A

FPO/BACK

ARCHITECT’S AND ENGINEER’S SPECIFICATIONS

The amplifier shall contain all solid-state circuitry, using complementary
silicon output devices in a Class AB output circuit. The amplifier shall
operate from 50-60 Hz AC power, with internal taps for selecting voltages
100,120, or 220-240 VAC. The amplifier shall operate from a normal house­hold AC outlet, drawing less than 580 VA when driven with random pro­gram material at 1/8 rated power into four ohm loads. The amplifier shall
be supplied with a single molded AC cord having an appropriate AC plug
for the intended operating voltage.

The amplifier shall employ forced-air cooling with a two speed fan 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 necessary between amplifiers for ventilation. The amplifier shall
be capable of continuous operation at 1/8 power, into four -ohm loads, for
ambient temperatures up to 104 F (40 C).

The amplifier shall contain two independent channels, with separate AC
transformer secondaries, power supplies, and protection systems. All pro­tection systems shall be self resetting upon removal of fault, and the re­maining channel shall continue to operate. Each channel shall have inde­pendent protective circuitry against open circuit, short circuit, or mis­matched loads. Each channel shall monitor temperature of its heat sink
and power transformer, and shall trigger fan speed boost, and if neces­sary, signal muting to prevent excessive temperature rise. Each channel
shall have 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
fault protection for the load, consisting of a load-grounding relay with
fault fusing to interrupt power. Fault fuses shall be adequately large to
prevent nuisance blowing at any output power the amplifier is capable of
delivering.

Each channel shall have the following controls and displays: A rear panel
Gain control and Bridge/Stereo/Parallel mode switch, front panel displays
consist of a green LED power-on indicator; one yellow LED signal indica­tor, triggering at -30 dB; a red LED showing true amplifier clipping; and a
red LED which indicates muting when illuminated. The output connectors
for each channel shall be shrouded barrier strip connectors. The input
connector shall be mounted on a removable panel to permit upgrades.
The standard input panel shall provide detachable Euro-style header con­nections for each channel. Inputs shall be electronically balanced, with a
minimum impedance of 10 kilohms per side, and a common mode rejec­tion of at least 50 dB from 20 Hz to 20 kHz. The standard input panel shall
contain switches for mono-bridging and parallel inputs, and solder pat­terns for input isolation transformers, gain reduction resistors, and first­order high and low pass filters .

The input panel shall have enough space behind it to contain a circuit
board measuring up to 5.9" wide by 4.1 “ deep. The multi-pin connector to
the amplifier circuitry shall supply positive and negative DC supply cur­rents, and for each channel, balanced input signals, output signal, and
clip/protect signal. Optional XLR and 1/4” RTS input connectors may be
installed in place of a standard blank panel, mounted above the standard
input panel.

Internally-mounted toroidal output transformers shall provide electrically
isolated output taps for 25, 70, and 100 volt distributed lines. The direct
amplifier output shall also be available to drive voice coil loads. The use
of voice coil and distributed line operation is independent on each chan­nel. It is possible to use both the direct and isolated outputs simulta­neously on a single channel, as long as the total power rating of the am­plifier is not exceeded. A built-in 45 Hz, third-order subsonic filter shall
be provided to reduce saturation of speaker transformers, due to exces­sive low frequency program material. The filter is non-defeatable and
affects all outputs.

Each channel shall be capable of meeting the following performance cri­teria with both channels driven: Sine-wave output power of 200 watts
into eight ohms, and 300 watts into four ohms, 45 Hz to 20 kHz, with less
than O.1% THD. Frequency response at 3 dB below rated power shall be ­3 dB at 45 Hz and -0.2 dB at 20 kHz. The voltage gain shall be 40, equiva­lent to 32 dB, and the input sensitivity shall be 1.02 Vrms. The signal to
noise ratio over the range of 20 Hz to 20 kHz shall exceed 100 dB. IHF
damping factor shall exceed 200 for the direct outputs. Output regula­tion, of the isolated outputs, shall not exceed 1.0 dB at 100 volts, 1.1 dB at
70 volts and 2.0 dB at 25 volts.

The amplifier chassis shall occupy three rack spaces, with provision for
securing the rear corners. Depth from mounting surface to tips of rear
supports shall be 17.9" (45.5 cm).

Weight shall not exceed 55 Ibs. (25 kg). The amplifier shall be the QSC
Audio Products Model CX6T.

DIMENSIONS

Faceplate Width Standard 19" (48.3 cm) Rack Mounting
Chassis Depth 17.9" (45.5 cm) deep (to rear support ears)
Faceplate Height 5.25" (13.3 cm)

WEIGHT Shipping–62 lb; 28 kg; Net–55 lb; 25 kg

1675 MacArthur Boulevard • Costa Mesa, California 92626-1468 USA • Phone: [phone] Fax: [phone]