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CMX Series
User Manual
CMX 2000V Amplifier
TD‑000323‑00
*TD‑000323‑00*
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IMPORTANT SAFETY PRECAUTIONS AND EXPLANATION OF SYMBOLS WARNING! The lightning flash with the arrowhead symbol within an equilateral triangle is intended to alert the user to the presence of uninsulated “dangerous” voltage within the product’s enclosure that may be of sufficient magnitude to constitute a risk of shock to humans. The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operation and maintenance (servicing) instru
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Warranty (USA only; other countries, see your dealer or distributor) Disclaimer QSC Audio Products, LLC is not liable for any damage to amplifiers, or any other equipment that is caused by negligence or improper installation and/ or use of this loudspeaker product. QSC Audio Products 3-Year Limited Warranty QSC Audio Products, LLC (“QSC”) guarantees its products to be free from defective material and / or workmanship for a period of three (3) years from date of sale, and will replace defective
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Introduction Thank you for purchasing this QSC power amplifier. Please read the following directions to obtain the best results. The rugged fan-cooled, 2-channel, 3RU amplifier provides high-value performance and power in a strong, compact chassis. Features • Independent, user-defeatable clip limiters • Fully selectable low-frequency filtering; choice of 30 or 50 Hz roll-off • STEREO (dual channel), PARALLEL INPUT, or BRIDGE MONO operating modes • Balanced inputs — XLR, ¼" (6.3 mm) TRS,
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Unpacking Factory packed carton contains: • CMX amplifier • User's manual • Adhesive rubber feet (for non-rack mount applications) • Attenuation security plate • Rear rack ear mounting kit • IEC-type detachable power cord Use the same type carton when shipping the amplifier. Rack Mounting Use four screws and washers to mount the amplifier to the equipment rack rails. To use the amplifier outside a rack, attach the self-adhesive rubber feet to the bottom. Use the rear rack ear support kit
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Front Panel (Figure 3) 1. Cooling air exhaust vents 5. Clip and Signal LEDs 2. Power On LED 6. Protect mode LED 3. Power switch 7. Security plate screw 4. Attenuation controls 1 1 2 3 5 4 5 7 4 6 — Figure 3 — Back Panel 1. Barrier strip input connectors 7. Terminal block connector 2. XLR input connectors 8. AC circuit breakers 3. TRS (1/4") input connectors 9. Switch settings for PARALLEL INPUTS, STEREO, BRIDGE MONO 4. Mode switches and settings 10. Serial number label 5. Cooling air inlet ve
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Features and Setup Attenuation Control Security Plate The Attenuation control security plate (Figure 5) provides protection against accidently adjusting the Attenuation controls on the amplifier face. Attach the plate, after making final adjustments to the Attenuation controls, by sliding the tabs into the two installation slots. Secure in place with the attachment screw. Attenuation plate installation slots (2) Attenuation plate not installed Attenuation plate Attenuation plate attachment s
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Input Low-Frequency Filter What it is The low-frequency (LF) filter rolls off signals below either 30 Hz or 50 Hz (Figure 9 and Figure 10). Each channel has a 12 dB per octave Low Frequency Filter to prevent cone over-excursion, making more power available for the loudspeaker’s rated frequency range. This reduces distortion and prevents amplifier overload. The filter settings for each channel are controlled individually through the DIP switch settings shown in (Figure 7). When the filter is
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PARALLEL INPUTS Mode What it is The PARALLEL INPUTS switches let you operate the amplifier in a parallel mode, delivering the same signal to both channels without using a Y cable. Each channel drives its own speaker load, with independent gain, filtering, and clip limiting. Set switch positions 4 and 5 to PARALLEL INPUTS to couple the inputs together (Figure 11). Turn the switches to STEREO for stereo, bi-amping, or other 2-channel modes. In PARALLEL INPUTS mode, you can use the other set of
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Bridge Mono Mode What it is Bridge mono mode combines the power of both amplifier channels into one speaker, resulting in twice the voltage swing, four times the peak power, and approximately three times the sustained power of a single channel. This mode uses Channel 1's input, attenuation control, input filter, and clip limiter; Channel 2's dip switch settings should be in the OFF positions, the Attenuation control should be at maximum attenuation (Figure 13 and Figur
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The Difference Between Modes STEREO Mode STEREO mode is the typical way of using the amplifier. Each channel is fully independent. Separate signals connect at the inputs, the attenuation knobs control their respective channels, and separate speakers connect to each output. The dip switches are set as shown in (Figure 17), a schematic illustra- tion in (Figure 18). Examples: • Two-channel (stereo) playback. • Two independent mono signals, such as main and monitor mixes. • Bi-amped operation,
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BRIDGE MONO Mode This mode combines the full power capabilities of both channels into a single speaker system. The amplifier internally re-configures so that both channels operate as a unit. This delivers double the output voltage, resulting in four times the peak power and three times the sustained power into a single 8 or 4 ohm speaker load. The BRIDGE MONO mode section on page 9 describes the special speaker connection used. Refer to (Figure 21 through Figure 23). Examples: • Driving a si
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Connections Inputs Each channel has active balanced XLR, ¼" (6.3 mm), and Barrier Strip inputs wired in parallel (Figure 24). The input impedance for balanced is 20k ohms, for unbalanced it is 10k ohms Balanced connections are recommended to reduce AC hum and interference, especially with long cable runs. Unbalanced connections may be suit- able for short cables. The signal's source impedance should be less than 600 ohms. Balanced Inputs Use the XLR or ¼" (6.3 mm) TRS input jacks, or the b
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Speakon™ Outputs CMX amplifiers offer a choice of output connections, with two NL4MD Speakon™ jacks and a terminal block connector. (Figure 28 through Figure 30) The Speakon™ connector is designed specially for high-power speaker connections. It locks in place, prevents shock hazard, and assures the correct polarity. Each channel accepts a normal two-wire cable. In addition, Channel 1 accepts a four-wire cable. Channel 1 Speakon™ jack has both Channel 1 and Channel 2 output signals (
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Terminal Block Connector The terminal block connector requires the following assembly. 1. Strip the wires to 7 ~ 8 mm. 2. Insert the wires into the male part of the connector according to the operating mode you are using. See (Figure 31). 3. Use a flat-tip screwdriver to secure the wires. Tighten the screws to 6 in.-lbs. 4. Insert the plug into the receptacle on the amplifier. 5. Use a flat-tip screwdriver to secure the connector. Tighten the screws to 6 in.-lbs. STEREO and PARALLEL INPUTS mode:
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Operation AC Power Switch Before applying power, check all connections and turn the attenuation controls fully counter clockwise to maximum attenuation. One second of muting is normal when the amplifier is turned on or off (Figure 32). Attenuation Controls Turn the Attenuation controls clockwise to decrease Attenuation and counterclockwise to increase Attenuation. The Attenuation controls are marked in numeric increments from ∞ to 0 (clockwise) indicating the amount of attenuation. Settings sh
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Fan Cooling The fan speed varies automatically to maintain safe internal temperatures. Keep the front and rear vents clear to allow full air flow. Hot air exhausts out the front of the amplifier so it does not heat the interior of the rack. Make sure that plenty of cool air can enter the rack, especially if there are other units which exhaust hot air into it. See (Figure 35). Safe Operating Levels The amplifiers protective muting system guards against excessive internal temperatures. With norm
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Indication: CLIP LED flashing If the red CLIP indicator flashes when signal is applied, the amplifier output may be shorted. Check the speaker wiring for stray strands or breaks in the insulation. Indication: CLIP LEDs bright and steady The amplifier is in protective muting. One second of muting is normal when the amp is turned on or off. Overheating will cause protective muting. The fan will be running at full speed and the chassis will be hot to the touch; sound should resume within a minut
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Specifications CMX 2000V Stereo Mode (both channels driven) 8Ω / FTC 20 Hz - 20 kHz / 0.1% THD 1050 W 8Ω / EIA 1 KHZ / 0.1% THD 1100 W 4Ω / FTC 20 HZ - 20 KHZ / 0.1% THD 1600 W 4Ω / EIA 1 KHZ / 1% THD 2000 W 2Ω / EIA 1 KHZ / 1% THD 2500 W 70 V - Direct drive / EIA 1 kHz / 1% THD 2500 W 100 V - Direct drive / EIA 1 kHz / 1% THD 1000 W Bridge Mono Mode 8Ω / FTC 20 Hz - 20 kHz / 0.1%THD 3200 W 8Ω / EIA 1 kHz / 0.1%THD 3600 W 4Ω / EIA 1 kHz / 1%THD 5000 W 140 V - Direct drive / EIA 1 kHz / 1% TH
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Mailing Address: QSC Audio Products, LLC 1675 MacArthur Boulevard Costa Mesa, CA 92626-1468 USA Telephone Numbers: Main Number: (714) 754-6175 Sales & Marketing: (714) 957-7100 or toll free (USA only) (800) 854-4079 Customer Service: (714) 957-7150 or toll free (USA only) (800) 772-2834 Facsimile Numbers: Sales & Marketing FAX: (714) 754-6174 Customer Service FAX: (714) 754-6173 World Wide Web: www.qscaudio.com E-mail: info@qscaudio.com service@qscaudio.com © 2010 QSC Audio Products, LLC. All r
