Crown International, Inc. Other trademarks are the property of their respective owners. Obtaining Other Language Versions: To obtain information in another language about the use of this product, please contact your local Crown Distributor. If you need assistance locating your local distributor, please contact Crown at 219-294-8200. Note: The information provided in this manual was deemed accurate as of the publication date.
Com-Tech Power Amplifiers Important Safety Instructions 1) Read these instructions. 2) Keep these instructions. 3) Heed all warnings. 4) Follow all instructions. 5) Do not use this apparatus near water. 6) Clean only with a dry cloth. 7) Do not block any ventilation openings. Install in ac- 8) Do not install near any heat sources such as radia- 9) Do not defeat the safety purpose of the polarized or 10) Protect the power cord from being walked on or...
Warranty. ITEMS EXCLUDED FROM THIS CROWN WARRANTY This Crown Warranty is in effect only for failure of a new Crown product which occurred within the Warranty Period. It does not cover any product which has been damaged because of any intentional misuse, accident, negligence, or loss which is covered under any of your insurance contracts.
Nor does it cover every possible situation which may arise during installation, operation or mainte- nance. If your unit bears the name “Amcron, ” please substitute it for the name “Crown” in this manual. If you need special assistance beyond the scope of this manual, please contact our Technical Support Group.
Com-Tech Power Amplifiers Com-Tech Amplifiers (120 VAC, 60 Hz Units) ... 8 Front Facilities ... 10 Rear Facilities ... 11 Mounting Dimensions ... 12 Top View of a Rack-Mounted Unit ... 13 Extra Cooling with a Rack-Mounted Blower ... 14 Wiring for Dual 8/4 Ohm Mode ...
“randomness”. Turn-on inrush is lim- ited by Soft-Start circuitry, so Com-Tech amplifiers never need a power sequencer. (To change the turn-on delay time, contact Crown’s Technical Support Group.) H. Power Cord All 120 VAC, 60 Hz North American units have a NEMA 5-15P plug with an integral voltage presence lamp.
Com-Tech Power Amplifiers J. Dual/Mono Switch For 8- and 4-ohm operation, remove the cover plate, if so equipped, then slide this switch to the center for Dual (two-channel) mode, to the left for Parallel-Mono mode or to the right for Bridge-Mono mode. WARNING: Do not change this switch unless the amplifier is turned off.
3 Installation This section covers basic Com-Tech installation proce- dures. All Com-Tech amplifiers are intended for rack mount installations using a commercial 19-inch (48.3-cm) EIA rack standard metal cabinet wired with a commercial grade electrical outlet box and recep- tacles. All Com-Tech Amplifiers utilize a convenient 3-foot long (0.9-m) power cord for such installations.
There are at least three ways to provide extra cooling for an amplifier that does not have an internal fan. The most effective method is to install an internal fan which is available from Crown as an accessory (refer to sub- RACK CABINET section 8.3).
Please use care when making connections, selecting signal sources and controlling the output level. The load you save may be your own! Crown assumes no liability for damaged loads resulting from careless amplifier use or deliberate overpowering.
140-volt output, you may need to cross-reference the ratings of the step-down transformer taps with Crown’s constant voltage computer (see Section 8.3). If you need a single channel with higher power to drive a 70-volt line, use Parallel-Mono mode.
Com-Tech Power Amplifiers WARNING: Both channels must be configured for the same output mode (8/4-ohm or 70-volt) before switching to Bridge-Mono mode. Bridge-Mono wiring is very different from the other modes and requires special attention. First, turn the amplifier off. Then select Bridge-Mono mode by sliding the dual/mono switch to the BRIDGE MONO (right) po- sition.
Com-Tech Power Amplifiers To select Parallel-Mono mode, turn off the amplifier and slide the dual/mono switch to the PARALLEL MONO (left) position. Connect the input signal to Channel 1 only. The Channel 2 input jack and Input Attenuation control are bypassed in this mode, so they should not be used.
4. Turn the entire system off before changing connections. Turn level controls down before powering the system back up. Crown is not liable for damage incurred when any trans- ducer or component is overdriven.
Com-Tech Power Amplifiers Use Good Connectors 1. To prevent possible short circuits, do not expose the loudspeaker cable connectors. 2. Do not use connectors that might acciden- tally tie two channels together when making or breaking connections (for example, a standard three-wire stereo phone plug).
Consider the power handling capacity of your load be- fore connecting it to the amplifier. Crown is not liable for damage incurred at any time due to overpowering. Fus- ing loudspeaker lines is highly recommended (see Sec- tion 3.3.5). Also, please pay close attention to Section 4.1, Precautions .
Com-Tech Power Amplifiers 7. If the size of the cable exceeds what you want to use, (1) find a way to use shorter cables, like using the IQ System , (2) settle for a lower damping factor, or (3) use more than one cable for each line.
Example: Z = 8 ohms. Peak Power = 75 W Answer: Fuse = 1.5 A Fig. 3.16 Loudspeaker Fuse Nomograph fuses and high-frequency drivers are protected by high- speed instrument fuses. Depending on the application, you may want to use a PIP module to protect your loudspeakers.
11. Tampering with the circuitry by unqualified personnel, or making unauthorized circuit changes may be hazard- ous and invalidates all agency listings. Remember: Crown is not liable for damage that results from overdriving other system components. 4.2 Indicators The front panel of a Com-Tech amplifier has several helpful indicators.
Page 26 Com-Tech Power Amplifiers To do this, Crown established a rigorous program to measure the safe operating area (SOA) of each output device before installing it in an amplifier. Next, Crown designed intelligent circuitry to simulate the instanta- neous operating conditions of the output devices.
SOA. Limiting is proportional and kept to an absolute minimum—only what is required to pre- vent output device damage. This level of protection enables Crown to increase out- put efficiency to never-before-achieved levels while greatly increasing amplifier reliability.
If it trips again or the unit fails to operate properly, contact an authorized service center or Crown’s Technical Support Group. A three-position input sensitivity switch is located in- side the amplifier’s PIP compartment. It is set at the fac- tory to a sensitivity of 0.775-volts (8/4-ohm mode).
Com-Tech Power Amplifiers 4.5 Energy Saving Circuit Application The new CT-10 Series amplifiers incorporate a new feature to significantly decrease the use of energy when the amplifier is idle. The Energy Saving circuit allows the amplifier to cut back its energy consumption based on the signal level offered to the inputs.
From the error amp, the voltage translator stage chan- nels the signal to the Last Voltage Amplifiers (LVAs), de- pending on the signal polarity. The +LVA and the –LVA, with their push-pull effect through the bias servo, and drive the fully complementary output stage.
(+) output terminals on the back panel, twice the volt- age can be output. Reference Manual The Channel 1 output feeds the Channel 2 error amp. Because there is a net inversion, the Channel 2 output is out of polarity with Channel 1. This produces twice as much voltage across the load.
6 Specifications The following specifications apply to all models in Dual mode with 8-ohm loads and an input sensitivity of 26 dB un- less otherwise specified. MAP at 1 kHz: This term refers to maximum average power in watts at 1 kHz with 0.1% THD. Full Bandwidth Power: This term refers to maximum aver- age power in watts from 20 Hz to 20 kHz with 0.1% THD.
“Soft-start” circuitry provides low inrush so power sequencers are rarely needed with multiple units. Note: The turn-on delay time may be changed. Contact Crown’s Technical Support Group for details. Circuit Breaker: Circuit breaker current ratings vary based on the Com-Tech model and AC mains voltage.
ments. Com-Tech 210 amplifiers are 3.5 inch (8.9 cm) high. North American models of Com-Tech 410 amplifi- ers are also 3.5 inch (8.9 cm) high. 50-Hz models of Com-Tech 410 amplifiers are 5.25 inch (13.3 cm) high. Com-Tech 810 amplifiers are 5.25 (13.3 cm) high. Com-Tech 1610 amplifiers are 7 inch (17.8 cm) high.
When measuring power, 0.1% THD appears to be the industry standard for distortion. Two of the maximum average power specifica- tions shown in each minimum power matrix are measured at 0.1% THD so you can easily compare Crown specifications to those of other manufacturers.
Maximum Power Specifications Crown’s maximum power specifications represent the largest amount of output power you can expect from your amplifier when it is driven to full output under the given conditions. These specifications can be used to prevent loudspeaker and hearing damage.
Com-Tech Power Amplifiers 7 AC Power Draw and Thermal Dissipation “ “ “ “ “ Soft-Start” inrush current limiting, protects the house circuit breaker when several amps are turned on simul- taneously. This section provides detailed information about the amount of power and current drawn from the AC mains by Com-Tech amplifiers and the amount of heat pro- duced under various conditions.
8 Ohm Dual / 16 Ohm Bridge-Mono / 4 Ohm Parallel-Mono AC Mains Current Draw (Amps) Thermal Dissipation Power Duty Draw Cycle 100-120 V 220-240 V btu/hr (Watts) Fig. 7.2 Com-Tech 410 Power Draw, Current Draw and Thermal Dissipation at Various Duty Cycles 8 Ohm Dual / 16 Ohm Bridge-Mono / 4 Ohm Parallel-Mono AC Mains Current Draw (Amps)
Processor with DSP (Digital Signal Processing) for PIP- compatible amplifiers. As a component of the IQ System, it connects the amplifier to the Crown Bus so the amplifier can be controlled and monitored. Its DSP capabilities enable it to be programmed with a variety of functions,...
IQ-PIP-USP2 is an IQ2 -series component. This means it supports Crown’s UCODE protocol and requires an IQ System with an IQ2-compatible IQ interface. UCODE (universal code) enables users and third parties to develop custom software objects to control and monitor IQ2-compatible components like the IQ-PIP-USP2.
We recommend the kit if you will be operating a Com- Tech 210 at high levels, in high temperatures for long periods, or with high duty cycle input signal, (see Sec- tion 3.2.1). Contact an authorized Crown servicer for installation of the optional fan kit. 8.4 Constant Voltage Computer Crown’s constant voltage computer is a easy-to-use...
Ac- cessories are not needed—do not send the product documentation, cables and other hard- ware. If you have any questions, please call or write the Crown Technical Support Group. Crown Customer Service Technical Support / Factory Service Plant 2 SW, 1718 W.
Crown Factory Service Information Shipping Address: Crown Audio, Inc., Factory Service, Plant 2 SW, 1718 W. Mishawaka Rd., Elkhart, IN 46517 Phone: 1-800-342-6939 or 1-219-294-8200 Fax: 1-219-294-8124 Owner’s Name: _________________________________________________________________________ Shipping Address: ______________________________________________________________________ Phone Number: _____________________________ Model: ________________________ Serial Number: ______________ Purchase Date: ___________ (Be sure to describe the conditions that existed when the problem occurred and what attempts were made to correct it.)