D-75 User Manual
Contents
1. the standards for long term use amplifiers and is used wherever audio is found in the lab on the road in the home and in the Studio Designed built and carefully checked to assure reliable operation into a wide variety of loads the D 75 is especially appropriate for systems where cost is a primary concern since its high reliability can be especially important in reducing start up and mainte nance costs The D 75 provides 35 watts per channel minimum RMS both channels operating into an 8 ohm load over a bandwidth of 20Hz 20 kHz with a rated total harmonic distortion of not more than 0 05 of the fundamental output voltage The frequency response of the unit varies no more than 01dB from 20 Hz 20kHz at 1 watt into 8 ohms The D 75 requires only 13 4 4 45 cm of vertical rack space and includes such features as active balanced inputs XLR connectors an easily accessible mono stereo switch and front panel LEDs indicating distortion and signal presence A special feature of the D 75 is the provision for isolating chassis ground from electrical ground Like all Crown amplifiers the D 75 offers traditional Crown durability and a full 3 Year No Fault Warranty T he Crown D 75 power amplifier is one of D SERIES Specifications Feature Summary Distortion Indicator Advanced OC Input Output Comparator alerts the user in the unlikely event that distortion of any kind exceeds 0 05 Exceptionally Low Di2. grounded connector Controls Power A two position rotary switch located on the front panel to turn the amplifier on and off Level A level control for each channel located on the front panel Dual Mono A two position switch located on the back panel selects between Dual stereo and Bridged Mono modes of operation Indicators 10C Normally off these red indicators flash in the rare event the output waveform differs from that of the input by 0 05 or more Signal These green indicators flash synchro nously with the input signal to show its presence Input Output Input Connector Balanced 3 pin XLR connector and unbalanced 4 inch phone jack for each channel Input Impedance Nominally 20 K ohms for balanced XLR inputs 10 Kohms for unbalanced XLR use and 25 K ohms for the unbalanced phone jack inputs Input Sensitivity 0 812 V 2 for rated power into 8 ohms Output Connector Color coded binding posts banana jacks Output Impedance lt 15 milliohms in series with lt 3 microhenries Construction All aluminum construction for maximum heat conduction and minimum weight Satinized aluminum front panel with gray suede Lexan insert Dimensions 19 in 48 3 cm wide 1 75 in 4 5 cm tall 8 375 in 22 3 cm deep behind front mounting surface Weight 10 Ibs 4 53 kg Mounting Standard EIA 310 front panel rack mounting Please contact a Crown representative for full details REMPLACER
3. SE REPLACE ONLY WITH 3AG 2A 125 250V Max Average 40 mS Tone Burst EIA Watts FTC Continuous Average Power at 0 1 THD Configuration See note 1 amp Load ohms Stereo both channels powered Crown s 3 Year No Fault Amplifier Warranty And 3 3 No Fault Extended Warranty Crown International now offers a 3 Year No Fault Warranty for every new Crown amplifier an industry standard With this unprecedented No Fault pro tection your new Crown amplifier is warranted to meet or exceed original specifications for the first three years of ownership During this time if your amplifier fails for any reason or does not perform to original specifications it will be repaired or replaced at our expense This includes parts labor and round trip shipping even a shipping carton should you need one About the only things not covered by this warranty are those losses normally covered by insurance and intentional abuse And the coverage is transferable should you ever decide to sell your amp That s not all for a modest fee Crown will extend that protection for an additional three years with our 3 3 No Fault Extended Warranty Now that s commitment See your Crown dealer for full war ranty disclosure and details on the No Fault and 3 3 No Fault Extended Warranty See note 2 single Cycle Tone Burst Watts at lt 0 05 THD See note 3 Power at 0 1 THD Architect Engineer s Specifications The p
4. completely solid state design with a frequency response from 5Hz 20 kHz 1 dB at 1 watt into 8 ohms The power amplifier shall be a Crown D 75 1990 Crown International Inc e Crown International Inc reserves the right to make changes in specifications or products without prior notice Crown and IOC are registered trademarks of Crown International Inc Watts at lt 0 05 THD See note 4 50 Hz at 1 THD See note 5 1 Continuous power in the context of Federal Trade Commis sion testing is understood to be a minimum of five minutes of operation Harmonic distortion is measured as the RMS sum total as a percentage of the fundamental output voltage This distortion specification applies for all wattages greater than 0 25 watts 2 A 1 kHz sine wave is presented to the amplifier and the output monitored for non linear distortion The level is increased until the THD reaches 0 1 At this level the average power per channel is reported 3 A single cycle of sine wave is presented to the amplifier and monitored for non linear distortion The average power during the burst is reported Speakers must be able to withstand this level if they are to be safely used with this amplifier 4 A 40 millisecond burst or two cycles of sine wave whichever is of greater duration is used and the power computed as the average power during the burst The duty cycle of this test is 10 percent This power level is a measure of how loud an ampli
5. fier is as perceived by the hearing process 5 EIA standard RS 490 both channels driven Crown Made in US A Exported as Amcron P O Box 1000 Elkhart Indiana 46515 1000 TEL 219 294 8000 FAX 219 294 8329 Crown Division 219 294 8346 Amcron Division K 1076 7
6. ower amplifier being of two channels shall deliver a minimum of 35 watts into 8 ohms each with both channels operating or 45 watts into loads of 4 ohms each with both channels operating When strapped into mono it shall be capable of delivering 70 watts into a 16 ohm load or 95 watts in 8 ohm loads The amplifier s outputs shall have internal protection against possible shorted mismatched and open circuits It shall provide instantaneous limiting with no annoying thumps or cutouts The circuitry Shall incorporate voltage amplifiers whose slew rate is controlled to protect the overall amplifier against RF burnout The amplifier shall provide in dual channel operation a voltage gain of 20 6 2 or 26 3 0 2dB at maximum gain have an input sensitivity of 0 81 volts 2 for full rated output and be capable of driving any load safely including completely reactive loads Hum and noise shall be 110dB below the rated output from 20 Hz to 20 kHz Intermodulation distortion shall be less than 0 05 from 01 watt to 35 watt into 8 ohms per channel The dimensions shall allow for standard 19 48 26cm EIA rack mounting It shall be 13 4 4 45 cm high and 9 22 86 cm deep from the mounting surface It Shall weigh 10 Ibs 4 5 Kg net The power requirements shall be 50 to 400 Hz AC with adjustable taps for 120 or 240 V 10 At idle the amplifier shall draw 15 watts or less maximum current draw The amplifier shall be class AB B and be of
7. stortion AB B design results in very low distortion Bridged Mono Mode Bridged Mono mode is provided for double output voltage Compact Size Occupies only 1 75 inches of vertical equipment rack space No Fault Warranty A 3 year standard No Fault warranty which may be extended for an additional three years Includes round trip Shipping Performance Note The following performance measurements were made in Dual stereo mode with both channels driven into an 8 ohm load Frequency Response 0 1 dB from 20 Hz to 20 kHz at 1 watt Phase Response 10 15 from 20 Hz to 20 kHz at 1 watt Signal to Noise Ratio 106 dB 20 Hz to 20 kHz at full output Total Harmonic Distortion THD lt 0 001 from 20 Hz to 400 Hz and increasing linearly to 0 05 at 20 kHz at 35 W Intermodulation Distortion IMD lt 0 05 from 10 mW to 0 25 W and lt 0 01 from 0 25 W to 30 W Slew Rate 6 V per microsecond Damping Factor gt 400 from DC 0 Hz to 400 Hz Power Output Power Note Maximum average power at 1 kHz with 0 1 THD Dual stereo 55 W per channel into 4 ohms 40 W into 8 ohms Bridged Mono 110 W per channel into 8 ohms 80 W into 16 ohms Load Impedance Rated for 16 8 4 ohm use Safe with all types of loads even reactive ones Required AC Mains 50 400 Hz AC with selectable transformer taps for 100 120 200 220 and 240 V 10 operation Crown AC Line Connector Standard three wire
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