Stereo Power Amplifier (1990)
Power output: 35 watts per channel into 8Ω (stereo), 95W into 8Ω (mono)
Frequency response: 20Hz to 20kHz
Total harmonic distortion: 0.05%
Damping factor: 400
Gain: 20.6 dB
Input sensitivity: 0.8V
Signal to noise ratio: 106dB
Speaker load impedance: 4Ω to 16Ω
Semiconductors: 42 x transistors, 18 x signal diodes, 2 x zener diodes, 4 x rectifiers, 3 x IC
Dimensions: 483 x 229 x 445mm
Finish: satinized aluminium front panel
If you have any problems opening files please read the download FAQ. All files are provided under strict licence and reproduction without prior permission or for financial gain is strictly prohibited.
If you have additional documentation please consider donating a copy to our free archive.
Reviewed Nov 05th, 2013 by John Buckham
The Crown D-75 series of professional power amplifiers is a stalwart of an amplifier. Unfortunately no longer in production, these workhorses provided long and incredibly dependable service in locations where a low power (35 w/pc) amp was needed. Most radio stations have at least one, it's a staple of the broadcasting industry.
In a nutshell -
Sonic Accuracy: 10
Ease of service: 6
User Friendliness: 6
Designed to be mounted in a 19 inch equipment rack these amps are convection cooled, the power devices mounted to the front panel excursion for cooling. These amps produce very little heat. Inputs are unbalanced 1/4 inch jacks, or balanced XLR connectors. Outputs are binding posts (earlier) or screw terminals (later). Front panel consists of a power on indicator (it's neon, and shows through the front panel - on older amps is usually burned out) two gain controls (round early, flat sided later) and a two signal output present indicators and two I.O.C. (overload) indicators.
In use these things ought to be a strait wire with gain, and on the bench the high signal to noise ratio and very low THD and IMD figures would suggest a very pleasing sound. Sadly, many audiophiles do not agree with this statement. It would seem depending on what type of speakers you are powering and preamp you have driving it, your listening experience may be varied. Audiophile listening impressions come back as: dry, wirey or presents a shallow and narrow sound stage-but not always. I also have heard great raving reviews. You will need to make the determination with your own ear and gear.
This amp was produced for years and years...it went through several design versions, all of them sound subtly and sonically different.
If you are planning to get a Crown D-75, and you could do a lot worse, if you are a serious audiophile I would suggest that you audition it before you buy it. If you are a professional planning to use it in a commercial/studio installation I would highly recommend it with no reservations.
It's a competent, reliable and rugged amp. But may of them are more than 20 years old and have spent their lives in racks turned on. One of the most important upgraded is to install new filter capacitors, if the unit is more than 10 years old. Crown still provides excellent factory support for these units and parts availability.