Crown DC300A free download

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w crolun DC-300A IM-9 S3P2-15-6 INSTRUCTION MANUAL SERIAL NO ISSUED DUAL CHANNEL LABORATORY AMPLIFIER DC-300A CROWN INTERNATIONAL, INC., BOX 1000, ELKHART, INDIANA 46514 0 Serial Number 1. Quies. offset of less than 1OmV 2. 1 KHz 180 watts RMS minimum into 8 ohms, per channel, both channels operating, 0.1% total harmonic distortion 4 ohm test w crown In-runaTlonac BATCH I D SERIAL NO 020163 Proof of Performance Report DC-300A laboratory power amplifier Amcron Label DCA-11 Line Voltage Requirement\ao,VAC CH.l J CH.2 J 3. ,/ 4. Protection tests 5. Reliability test \ 6. 20KHz 1 5 5 w a t t s p e r c h a n n e l minimum RMS (both channels operating) into 8 ohm. 0.05% total harmonic distortion 7. 10 KHz. sq. wave 8. Mono operation 9. IM Dist. into 8 ohms (%) (60-7KHz 4:1) S.M.P.T.E. 155W 49.0W 15.5w 4.9w 1.55w 490mW 155mW .. 4 9 m W c ci/ Y' 15.5mW `2 1 db la/db z -002 -002 * c?oJ. _ cl03 _ @O'j .00cc 10. Hum and noise-db below 155W into 8 ohm (20Hz - 20KHz) 11. Quies. AC power input at 120 VAC is a W see reverse side for explanation of tests performed `TOTAL PERFORM A N CE IS WHAT COUNTS" 4. Protection Test - This is a test with a 2 ohm load which determines the threshold at which the protection circuitry will be activated. Sharp clipping should occur with no evidence of instability. The positive and negative limiters operated independently and therefore may not be activated simultaneously. Reliability Test - This test puts the output stages through an extremely vigorous thermal cycling. The test is a very low frequency input signal driving the output to full power across a short circuit for a predetermined period of time. 20KHz CROWN test and check-out procedures reflect our basic design philosophy; we believe that reliability can be engineered into a product. As such, our check-out is designed to expose and correct a problem, before it happens. This testing begins when the unit is still a pile of parts; grading and selection of components is standard. The final test-inspection is the culmination of this vigorous program, but our concern doesn't stop here. Our products are backed by an extensive field service program, and protected by a comprehensive warranty. A word about our testing procedure is in order. All our specifications are referenced to an AC input of 120 VAC. The high current demand with high power tends to cause the line voltage to sag, or the sinusoidal waveform to distort. With a distorted waveform (or lower line voltage) the peak voltage is lowered. Since it is the peaks that charge the filter capacitors in the amplifier power supply, and thus determine the maximum power output, a line voltage problem reduces the maximum power output. CROWN uses a peak equivalent AC voltmeter which measures the peaks of any waveform and converts this to an equivalent rms reading for a sinusoidal waveform. This way we can vary or regulate the line voltage, no matter how distorted the waveform, to an equivalent of a 120