Instruction/ maintenance manual of the product CX168 QSC
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1 User Manual CX168 8-Channel Installed Sound Professional Audio Amplifier TD-000095-00 rev .A *TD-000095-00*.
2 CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE THE COVER. NO USER-SERVICEABLE P ARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL. FCC INTERFERENCE ST A TEMENT NOTE: This equipment has been tested and found to comply with the limits for a class B digital device, pursuant to part 15 of the FCC rules.
3 INTRODUCTION: CX168 Overview .......................................................................................4 Front Panel Illustration .........................................................................................4 Rear Panel Illustration .
4 FRONT PANEL WITH SECURITY PLA TE INTRODUCTION Congratulations on your purchase of the CX168 power amplifier . T o help you obtain the best results from your purchase, we encourage you to carefully review this manual. With information including connections, configuration and operation, it offers many useful guidelines.
5 INTRODUCTION REAR PANEL DIMENSIONS AND MOUNTING POINTS.
6 INST ALLA TION: UNP ACKING & RACK MOUNTING Rack Mounting Supporting the Rear of the Amplifier What is Included Unless the amplifier is being installed in its final, fixed location, we strongly recommend supporting the rear of the amplifier . Supporting the rear of the amplifier is required for mobile and portable use.
7 INST ALLA TION: COOLING & AC MAINS REQUIREMENTS AC Mains Connection Do not obstruct the front or rear air vents! Make sure that plenty of cool air can enter the rack, especially if there are other units which exhaust hot air into it.
8 SETUP: SETTING THE MODE CONFIGURA TION DIP SWITCHES Setup By using the mode switches and connecting to the amplifier properly , the CX168 amplifier can be configured as a 1 to 8 channel amplifier . This flexibility enables the CX168 to be used for most any multichannel application.
9 SETUP: SETTING THE MODE: STEREO, P ARALLEL, OR BRIDGE Modes Stereo- Stereo mode supports two completely separate audio channels, usually referred to as ‘left’ and ‘right’. Stereo configurations have two separate input signals and two separate output signals.
10 SETUP: MODE SWITCHES: CLIP LIMITER AND LOW FREQUENCY FIL TERS The CX168 amplifier has separate clip limiters for each of the 8 channels. These clip limiters respond only to actual amplifier clipping. Amplifier clipping generates internal error signals which cause the clip limiter to quickly reduce gain and minimize the overdrive.
11 SETUP: MODE SWITCHES: CLIP LIMITER AND LOW FREQUENCY FIL TERS Frequency Response Curves Filter off Filter ON, 33 Hz. Filter ON, 70 Hz. Low Frequency Filtering T ips: The OFF position should be used only for subwoofer systems with rated frequency response below 33 Hz.
12 Unbalanced inputs : Connect the conductors to the connector as shown. Make sure that the unused side of the balanced input is connected to ground, as shown.
13 CONNECTIONS: INPUTS- Using the DataPorts If used, the DataPort must be connected to a QSC DataPort product using a QSC DataPort cable. Do not use computer cables; they look similar but can cause operational problems with your amplifier and/or DataPort accessories.
14 CONNECTIONS: OUTPUTS BRIDGE MODE PRECAUTIONS: Do not use 2 ohm or 4 ohm loads in bridge mode! 8 ohms is the minimum impedance for bridge mode operation. This mode puts a high demand on the amplifier and speaker . Excessive clipping may cause protective muting or speaker damage.
15 CONNECTIONS: OUTPUTS- USING THE TERMINAL BLOCK CONNECTORS The output connections are made by attaching speaker wires to the 8-pin terminal block connectors. Once these connectors have been “ populated ” with the necessary speaker wire connections, plug the terminal blocks into their respective output jack.
16 If the POWER LED fails to illuminate when the switch is in the ON position: The power switch is a rocker -type switch. It is located on the left side of the front panel. T o turn the amplifier on, push in on the top of the switch. T o turn the amplifier off, push in on the bottom of the switch.
17 OPERA TION: LED INDICA TORS CLIP : Each channel has a red ‘ clip ’ LED that illumi- nates when the channel clips. It is located to the upper - right of each channel ’ s gain control. Normal indication: illuminates briefly at extreme output power peaks.
18 Gain Controls T ypical gain control showing attenuation level markings and LED’ s for the channel. Note that there is only one BRDG (bridge) and one P AR (parallel) indicator per channel pair .
19 OPERA TION: GAIN CONTROL SECURITY PLA TE Gain Control Security Plate After final gain adjustments have been made, the gain controls can be covered with a security plate. This easy-to-use security plate makes it difficult for others to adjust the gain.
20 QSC ’ s DataPort equipped amplifiers offer operators of larger audio systems a high degree of system monitoring and operation from remote locations. A system operator in a sports complex might be located hundreds of yards (meters) from the actual amplifiers, making ‘ normal ’ control and monitoring of the system difficult, at best.
21 What Can I Connect to the DataPort? OPERA TION: USING THE QSC DA T APORT CONNECTIONS General Guidelines to using the DataPorts on the CX168 1. Each channel pair ( Ch.1-2, Ch.3-4, Ch.5-6, and Ch.7-8) has its own dedicated DataPort connector that applies control and monitoring functions to its specific channel pair .
22 A simple application of the CX168 would be an installation with 4 rooms of coverage; each room to be provided with a stereo audio feed. All speakers are 4 ohm or greater impedance and have a frequency response rated down to 45 Hz., making them suitable for the 70 Hz.
23 APPLICA TIONS: TYPICAL APPLICA TION EXAMPLES T ri-Amp’d Stereo Cabinets with Subwoofer Driven by Bridged Channel Pair (continued) Routing is a function of ‘ easiest wiring ’ order and is: LF Driver Left: Ch. 4 Mid Driver Left Ch. 3 HF Driver Left Ch.
24 Parallel Mode: Stereo Mode: NOTE: Ensure that the MODE SWITCHES are set to STEREO when feeding two separate signals to the two channels. STEREO MODE OPERA TION P ARALLEL MODE OPERA TION APPENDIX: DESCRIPTION OF STEREO & P ARALLEL OPERA TING MODES NOTE! In the following diagrams, channels 1 and 2 are shown as examples only .
25 APPENDIX: DESCRIPTION OF BRIDGE OPERA TING MODE BRIDGE MODE OPERA TION- Note that speaker connection for bridge mono mode is different than other modes. See section on Connections: Outputs for proper bridge mode output connections. Bridge mode combines both output channels into one output.
26 APPENDIX: MUL TIPLE SPEAKER LOADS IN SERIES Series connection is where the same signal current flows through each of the speaker loads. The signal goes into one terminal of the first speaker and out its other terminal; then the signal goes into one terminal of the next load, and so on.
27 APPENDIX: MUL TIPLE SPEAKER LOADS IN P ARALLEL If each speaker load is connected across the same signal source (the output of the amplifier), then the loads are in parallel with one another . If one of the speakers fails in a parallel-connected system branch, the remaining speakers will continue to operate.
28 • INDICA TION: CLIP LED FLASHING • If the red clip indicator flashes when signal is applied, the amplifier output may be shorted. Check that the speaker cable connec- tions are tight and reliable at both ends. Check the speaker cables for stray strands or breaks in the insulation.
29 PROBLEM: DISTORTED SOUND Magnetic field from power supplies in equipment can induce hum into cabling that is located in the field. If hum is a problem, try relocating cabling so that is away from power supplies, transformers and other magnetic field producing devices.
30 SPECIFICA TIONS CX168 OUTPUT POWER in watts FTC: 8 ohms per channel (20 Hz.-20 kHz., 0.05% THD) 90 4 ohms per channel (20 Hz.-20 kHz., 0.1% THD) 130 EIA: 8 ohms (1 kHz, 0.1% THD, 1 channel driven) 120 (100 watts, all channels driven) 4 ohms (1 kHz, 0.
31 SPECIFICA TIONS CX168 AMPLIFIER PROTECTION Full short circuit, open circuit, thermal, ultrasonic and RF protection. Stable into reactive or mismatched loads.
32 Disclaimer QSC Audio Products, Inc. is not liable for any damage to speakers, amplifiers, or any other equipment that is caused by negligence or improper installation and/or use of the ISA amplifier .
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36 QSC Audio Products, Inc. 1675 MacArthur Boulevard Costa Mesa, California 92626 USA “ QSC ” and the QSC logo are registered with the U.S. Patent and T rademark Office.
An important point after buying a device QSC CX168 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought QSC CX168 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data QSC CX168 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, QSC CX168 you will learn all the available features of the product, as well as information on its operation. The information that you get QSC CX168 will certainly help you make a decision on the purchase.
If you already are a holder of QSC CX168, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime QSC CX168.
However, one of the most important roles played by the user manual is to help in solving problems with QSC CX168. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device QSC CX168 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
