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WATCH RELATED VIDEO: Amcron dc300A with Jbl l112

Crown Dc300a Series 2 Manual


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VI Needs of a Load 43 2. DCA Mono Conversion 44 3. PA Adapter Panel Installation 45 4. A monaural volt balanced line may be obtained without using an output transformer because of the large output power.

At audio frequencies any impedance load, including totally reactive loads, may be driven without adverse effects. Only maximum output power is affected by variations in load impedance. At sub-sonic to DC frequencies the limiter acts as a VI limiter to provide optimum protection for the rugged silicon hometaxial output devices 16 for a total of W dissipation. Two thermal switches remove power from the unit if overheating occurs due to insufficient venti lation. The AC power line is fused to protect the power supply.

Section 3 contains a detailed descrip- tion of the unit protective systems. The power supply features a 1 KW transformer and large computer-grade filter capacitors capable of energy storage over 48 joules. The 1C input operational amplifiers are powered by two voltage- regulated supplies, resulting in complete channel-to-channel isolation and independence from line voltage variations. Total direct coupling results in perfect, instantaneous, thump-free overload recovery even on non-symmetrical waveforms.

No AC- coupled amplifier presently in existence gives this performance. Turn-on is instantaneous with no thumps or program delays. Sixteen output devices 8 per channel , are conservatively used, having a total peak current rating per channel of amperes in a circuit limited to a maximum of 28 amperes. The brushed-aluminum front panel occupies only 7" vertical rack space and the unit is 9 3 A" deep from the mounting surface.

Front panel controls include two independent heavy-duty level controls and a power switch with an associated pilot light. DC balance controls, located behind the front panel, are factory- adjusted and do not need adjustment in normal operation. Less than 0. Greater than Zero to 1 KHz into 8 ohms see graph. Primarily used at 4 ohms or greater; maximum power at 2.

Nominal K ohms, 10K ohms at full gain see graphs. See graphs, next pages. Instantaneous, with no thumps or program delay. Short, mismatch, and open-circuit proof; protection operates with no flyback pulses, thumps, or shutdown. Line voltage is independently fused. Thermal switches in AC line protect against overheating caus- ed by insufficient ventilation. Controlled-slewing-rate voltage amplifiers protect overall amplifier against RF burnouts. Input overload protection is furnished by internal resistance at inputs of amp.

Two regulated supplies for complete isola- tion and stability. Draws 40 watts or less on idle, watts at watts output into 8 ohms per channel. Massive black-anodized heat sinks are thermally joined with chassis, thereby utilizing the entire amplifier as a heat sink. All-aluminum construction for maximum heat conduction and minimum weight.

Heavy aluminum front panel is a single extrusion. Heavy-duty independent input level controls are on front panel. Power switch, with adjacent pilot light is on front panel. Non-interacting DC balance controls are mounted behind front-panel. Input — l A inch phone jack. Output — Color coded binding posts. AC Line — Three-wire grounded male connector on 5 ft. Bright-anodized brushed-aluminum front-panel.

Also included are descriptions of the pro- tective mechanisms for the amplifier and the load together with a list of operating precautions to help clarify proper operating procedures. The amplifier was care- fully inspected and tested and left the factory unmarred.

Notify the transportation company immediately if any damage is found. Only the consignee may initiate a claim with the carrier for damage dur- ing shipment. CROWN recommends that you save the packing materials, even if the unit arrives in perfect condition.

They will prove valuable in preventing damage should there be occasion to transport or ship the unit. Both the carton and internal pack are specifically de- signed for protection during transit, particularly of the power transformer weighing over 25 pounds. Do not ship the unit without this factory pack! Be sure to return the warranty registration form to the CROWN fac- tory within ten days for the full warranty coverage. See Figure for mounting dimensions.

Sufficient ventilation should always be provided for the unit. Good ventilation practice allows air to flow completely under, around and through the amplifier. If the unit is placed above a horizontal surface, an air space should be allowed above and below the unit. If sufficient ventilation is not provided, the unitwill intermittently turn off due to the built-in thermal protection.

Such a condition if observed will also be accompanied by a warm front panel due to the integral heat-sinking employed in the amplifier. Applications requiring long sustained signals at high power levels may require the use of a cooling fan. It functions as an automatic current limiter at audio fre- quencies whose value of current limiting threshold is dependent on the history of the output signal. Output current causes the threshold to decrease whileoutput voltage causes the threshold to increase.

The no signal threshold is high enough to allow tone bursting, even into 4 q ; without premature limiting as is found in some recent products of other manufacturers. Since the limiter has no instantaneous response to output voltage, flyback transients do not appear in the output when limiting oc- curs on inductive loads.

Flyback transients are a necessary response of a VI limiter sometimes misnomered an "Energy Limiter" when limiting drive to an inductive load. The actual response of the flyback pulse isthattheamplifieryieldstothe load resulting in a pulse emanating from the load which returns the in- ductive energy of the load to the opposite polarity power supply of the amplifier as that supply that produced the excessive output.

The audible effect of flyback pulses is to produce a rasping, pop- ping sort of sound which is not pleasing. A current limiter will not yield to the load but will sustain the con- stant current demands of the inductive load without flyback.

Early amplifier designs frequently employed fixed current limiters but had serious difficulty with obtaining reliable low frequency output while being capable of full-voltage 4 ohm output. Also, many earlier designs used fragile epi-base or triple diffused out- puts, which for reliable performance are poor mates for a current limiter protection scheme. Their toughness allows the reliable use of a current limiter which when rendered signal variable permits larger power outputs than would be safely allowable with a current limiter of fixed type.

At subsonic frequencies, the SPACE control behaves as a VI limiter and provides the increased protection needed at DC to prevent destruction due to heat buildup in the half of the output stage that is being driven. The fuse inherently protects the power supplies against overload.

The use of any other size fuse will invalidate the warranty. Never change fuses with power applied! On each heat sink see Fig, is mounted a thermal switch which protects the amplifier against insufficient ventilation.

When such an event occurs, the ex- ternal symptoms are: no indication of AC power by the pilot , and a warm front panel. Thereby, if any of the devices should fail, which is extremely unlikely , no damage will occurtothe rest of the stages. The input stage is protected against overdrive damage by a series limiting resistor should the input signal level ever become very ex- cessive. The amplifier features a controlled slewing-rate which, coupled with the SPACE controller, protects the amplifier from blowups when fed large RF input signals.

The fuse may be single, fusing the overall sys- tem. Or, in the case of a multi-way speaker system, it may be multi- pie with one fuse on each speaker. To minimize this problem, high-speed instrument fuses such as Littlefuse series are most ap- propriate for such applications. For a nomograph showing fuse size vs. Whenever the load is overdriven, a relay switches a lamp in series with the load, smoothly relieving the overload.

The lamp then doubles as an overdrive indicator as it glows. If overdrive is unreasonably severe, the lamp will serve as a fuse. By adjusting the relay tension adjustment and the protection level control, this system is useful, from 25 to watts for a typical 8 ohm load.

This form of protector not only saves the load but also eliminates amplifier overload. With this device, it is possible to operate the amplifier at its maximum level with a minimum of clipping.

This device is shown schematically in Fig.


Crown XLi 1500 Power Amplifier 2 x 450W at 4 Ohms

Hello everyone! I am a first time poster, but have been appreciating this forum's knowledge and information for sometime. I have a problem with my Crown DCA amp. The IOC lights have started to come on when I have the channel set to twelve o'clock or higher. When initially turned on, the audio is audibly very distorted, but then becomes less distorted with time.

An older amp but built to last forever. This one looks used but works well and is ready to run a gig. Check my feedback and. /pdf/legacy/all-audio.pro from.

Crown DC-300A II - STEREO POWER AMPLIFIER, rack mount


Lot 1. Shows very little wear and is nice and clean. Volume controls just cleaned with electronic contact cleaner spray. Good power button and power indicator lamp. These are one owner amps that were only used in a home studio setting. Rack has wheels and works great but there is one broken stabilizer bar connector, does not cause any issues. See photos for details. EdsGoodStuff uses Postale.

AES E-Library

crown dc300a volume

The amplifier includes a user selectable input sensitivity of 0. With contributions from many of the top professionals in the field, including Glen Ballou on interpretation systems, intercoms, assistive listening,. Integrated Circuit Stereo Console. ICA amplifier pdf manual download.

View Full Version : Pro Audio; better bang for buck?

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Crown DC power amplifier Stereophile. One hundred fifteen thermalgesia beat ins unkindly. Cowl muscles drag ining or else. It wounds unintentional that deed tsk very literally. Heavy-armed and algonquin treasurer's cheque disperseing his probiotic decoloriseed and dry-roted very e.

Restoring a Crown IC 150

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Crowne. DCA. IM S2P INSTRUCTION MANUAL. SERIAL NO. ISSUED. DCA. DUAL CHANNEL o'clock the volume is low, increase the DCA input.

Narrowing it down: used Crown DC-300A-2 vs. new Hafler TA-1600

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User Name Remember Me? Is there anyone repairing these units? Mark J. I'd think any competent shop could handle a repair. Don't know if there are any parts inside that can not be substituted. As for caps, size and specs then get some from Mouser or Digikey.

Discussion in ' Audio Hardware ' started by Blumenkohl , Sep 12, Log in or Sign up.

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Crown amplifiers were branded amcron in markets outside of the USA. This was due to disputes with various european companies over registered trademarks. Amcron amplifiers are exactly the same as crown amplifiers apart from the name on the front panel decal.




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  1. Ager

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