Gebruiksaanwijzing /service van het product CX Series van de fabrikant QSC Audio
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31 CX Series USER MANUAL ▼ ▼ ▼ ▼ ▼ CX4 ▼ ▼ ▼ ▼ ▼ CX4T ▼ ▼ ▼ ▼ ▼ CX6 ▼ ▼ ▼ ▼ ▼ CX6T ▼ ▼ ▼ ▼ ▼ CX12 ▼ ▼ ▼ ▼ ▼ CX12T Rev.
1 T able of Contents P ART 1—CX SERIES USER MANUAL I. Warning Notices ....................................................................................................................................... 2 Speaker Damage ..........................
2 EXPLANATION OF GRAPHICAL SYMBOLS The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to alert the user to the presence of uninsulated “dangerous voltage” within the product’s enclo- sure that may be of sufficient magni- tude to constitute a risk of electric shock to humans.
3 I. Warning Notices SPEAKER DAMAGE The CX Series amplifiers are among the most powerful professional amplifiers available and are capable of producing much more power than many loudspeakers can handle. It is the user’s responsibility to use suitable speakers with the amplifier and to use them in a sensible way that will not cause damage.
4 II. Overall Description The CX Series from QSC comprises six high-efficiency professional power amplifier models, each with two independent channels. The table below lists the range’s audio power ratings. Each channel has its own power transformer secondary.
5 2 4 1 12 Front features of CX6, CX6T, CX12 or CX12T amplifier 2345 1 12 10 9 7 7 8 14 6 11 10 11 13 10 9 7 7 8 6 14 13 Front features of CX4 or CX4T amplifier 1 — Power Switch 2 — Power Indicato.
6 Channel 2+ Channel 2- Ground Ground Ground Channel 1- Channel 1+ Loosen screw, insert wire here, then tighten screw. III. Inputs CX amplifiers feature balanced inputs, connected via a Euro-style 7-terminal detachable header. Attach input signal wires as shown.
7 Output connections for CXT, bridged mono mode, 200 volt line. Output connections for CXT, bridged mono mode, 140 volt line. If your application calls for connecting an 8-ohm speaker and a distributed line to the same amplifier channel, the CX4T, CX6T and CX12T can do that.
8 V . Controls & Displays CX4 AND CX4T The channel attenuator controls, labeled in dB of attenuation , are located on the rear panel. They have 11 detents, adjustable from 0 dB (full gain) to × (full attenuation). The LED displays for each channel function as shown at right.
9 CX6, CX6T, CX12 and CX12T When the amplifier is first turned on, the red “ PROTECT ” LED on each channel will light for about two or three seconds, during which the output relays will stay open to mute the speakers.
10 • If the fan is not running at full speed, or the channel does not reset to normal after a cool-down period, the muting is probably because of a DC fault or other amplifier failure, especially if the “ SIGNAL ” or “ CLIP ” indicators are lit even with the attenuator turned all the way down.
11 The standard input panel installed on the CX Series amplifier has balanced Euro-style detachable header inputs, gain controls, and the Parallel-Stereo-Bridge switch. The panel ’ s circuit board has solder footprints for passive roll-off circuit components, input isolation transformers, and other special customizations.
12 Instructions for bridged operation CX4 and CX4T 1. To engage the bridged mono mode, jumper the barrier strip inputs on the rear, in accordance with the diagram printed under the barrier strip inputs. Connect the amplifier input to channel 1 only, with the jumpers as shown to channel 2.
13 MAXIMUM LONG-TERM OUTPUT POWER In a properly designed sound system, you can obtain the desired sound level without using the full output power of the amplifier; if the “ CLIP ” indicators flash once in a while, that is perfectly normal.
14 HEAT EMISSIONS Essentially, a power amplifier draws electrical energy from the AC mains, converts it to DC, and then converts it again into an analog of the input signal to send out to the loudspeakers.
15 PROTECTION CIRCUITS The design goal in high-efficiency amplifiers such as the CX Series is to increase the amplifier ’ s ability to deliver peak power without increasing its size, weight, and cost. However, the higher power flow through the output components makes effective, responsive protection circuitry absolutely vital.
16 VII. Specifications CX4 CX4T CX6 CX6T CX12 CX12T POWER OUTPUT Direct output, watts per channel, both channels driven 8 Ω , 20 Hz – 20 kHz, 0.1% THD 1 5 0 2 0 0 4 0 0 8 Ω , 45 Hz – 20 kHz, 0.1% THD** 1 5 0 20 0 4 0 0 8 Ω , 1 kHz, 1% THD 1 7 0 1 7 0 22 0 2 2 0 4 7 5 4 75 4 Ω , 20 Hz – 20 kHz, 0.
17 VII. Specifications (cont.) CX4 CX4T C X6 CX6T CX12 CX12T VOLTAGE GAIN @ direct outputs: 35 × (31 dB) 35 × (31 dB) 40 × (32 dB) 40 × (32 dB) 56.5 × (35 dB) 56.5 × (35 dB) INPUT SENSITIVITY, VRMS for rated power, 8 ohms 0.98 0.98 1.03 1.03 1.043 1.
18 VII. Specifications (cont.) POWER CONSUMPTION (see chart on page 13) Normal operation: 1/8 power @ 4 Ω per channel Worst case continuous program: 1/3 power @ 2 Ω per channel Maximum: full power @ 2 Ω per channel Multiply current times 0.
19 Part 2 — CX Series Application Guide W ith the helpful advice and input from contractors and consultants around the world, engineers at QSC designed the CX Series amplifiers to be a versatile and reliable foundation for high-quality installed sound systems.
20 1watt in 1 meter 2 meters 3 meters 92 dB SPL 86 dB SPL 82.5 dB SPL 80 dB SPL 4 meters sensitivity = 92 dB, 1 watt@1m IX. Designing the Distributed Sound System There are several main steps in desig.
21 reflective surfaces — wood floors and ceiling, concrete and plaster walls, etc., the type of room that tends to make speech unintelligible — might benefit from using many low-powered loudspeakers placed throughout the room and close to the listeners, instead of using a couple high-powered, centrally-located loudspeakers.
22 -10.0 -8.0 -6.0 -4.0 2.0 4.0 6.0 8.0 0.5 10.0 12.0 14.0 16.0 18.0 20.0 0.1 1 0.2 10 100 5 20 50 2 0.0 dB(ref1watt) Power(Watts) -2.0 DETERMINING POWER LEVELS After you’ve determined where to place the loudspeakers, you need to calculate the power each one requires.
23 EXAMPLE A loudspeaker (sensitivity: 94 dB @ 1W, 1 meter) in a busy office covers an area with an ambient noise of 72 dBA, measured at a seated person ’ s ear position at the desks. The client wants superb intelligibility, so your goal is to provide an SPL of 97 dB (72 plus 25) to the intended listeners.
24 USING COMPONENTS WITH DIFFERENT VOLTAGES Sometimes it may be practical to use a transformer or loudspeaker/transformer combination with a different voltage system from what it was originally intended. For example, a 70-volt transformer could be used in a 25- volt system, although you would have to derate the power taps similarly.
25 X. How Many Speakers? How many loudspeakers can you connect to the distributed line? The amplifier itself determines the amount of audio power available to the line, and from that figure you must compensate for insertion loss in the speaker transformers and for headroom when you determine how much power is available for the speakers.
26 XI. Other Design Considerations SPEAKER TRANSFORMER SATURATION Speaker transformers tend to be fairly small, and some vary widely in quality. They tend, therefore, to be prone to core saturation at low frequencies.
27 speaker, it will affect the sound level from the distributed line ’ s speakers also, possibly altering them from your intended levels. An alternate method is to attach an 8-ohm speaker across the 25-volt outputs.
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29 AC CURRENT CONSUMPTION A major objective in the design of the CX Series amplifiers — even the higher-powered models — is to permit their operation from readily available, standard AC power sources.
30 XII. Address & T elephone Information Address: QSC Audio Products, Inc. 1675 MacArthur Boulevard Costa Mesa, CA 92626-1468 USA Telephone Numbers: Main Number (714) 754-6175 Sales Direct Line (714) 957-7100 Sales & Marketing (800) 854-4079 (toll-free in U.
32 1675 MacArthur Boulevard Costa Mesa, California 92626 USA PH: (714) 754-6175 FAX: (714) 754-6174 “ QSC ” and the QSC logo are registered with the U.
Een belangrijk punt na aankoop van elk apparaat QSC Audio CX Series (of zelfs voordat je het koopt) is om de handleiding te lezen. Dit moeten wij doen vanwege een paar simpele redenen:
Als u nog geen QSC Audio CX Series heb gekocht dan nu is een goed moment om kennis te maken met de basisgegevens van het product. Eerst kijk dan naar de eerste pagina\'s van de handleiding, die je hierboven vindt. Je moet daar de belangrijkste technische gegevens QSC Audio CX Series vinden. Op dit manier kan je controleren of het apparaat aan jouw behoeften voldoet. Op de volgende pagina's van de handleiding QSC Audio CX Series leer je over alle kenmerken van het product en krijg je informatie over de werking. De informatie die je over QSC Audio CX Series krijgt, zal je zeker helpen om een besluit over de aankoop te nemen.
In een situatie waarin je al een beziter van QSC Audio CX Series bent, maar toch heb je de instructies niet gelezen, moet je het doen voor de hierboven beschreven redenen. Je zult dan weten of je goed de alle beschikbare functies heb gebruikt, en of je fouten heb gemaakt die het leven van de QSC Audio CX Series kunnen verkorten.
Maar de belangrijkste taak van de handleiding is om de gebruiker bij het oplossen van problemen te helpen met QSC Audio CX Series . Bijna altijd, zal je daar het vinden Troubleshooting met de meest voorkomende storingen en defecten #MANUAl# samen met de instructies over hun opplosinge. Zelfs als je zelf niet kan om het probleem op te lossen, zal de instructie je de weg wijzen naar verdere andere procedure, bijv. door contact met de klantenservice of het dichtstbijzijnde servicecentrum.
