Crown D-75A Stereo Power Amplifier, 2000-2014, made in USA

The D-45 and D-75A are perfect for moderate power applications such as recording or broadcast studio near-field monitoring, video suite audio monitoring, a recording/broadcast headphone amp or a small paging system. Designed, built and carefully checked to ensure reliable operation with a wide variety of loads, Crown D Series amplifiers are convection cooled. Their high reliability is particularly important in reducing maintenance costs. 

Link: crownaudio | !!!FULL DESCRIPTION!!! | Reference Manual | Service Manual

Date of manufacture (D-75A): 2000s ~ 2014

The D-75A is a cost-reduced version that came out sometime in the 2000s. 

It should have the same basic performance, but Crown took away the speaker connectors and replaced them with a terminal strip to save itself money. 

Crown also removed the dedicated unbalanced input and instead uses XLR combo jacka for balanced inputs only. The combo jacks will accept XLR or 1/4", but it's a 1/4" TRS balanced input, not the mono 1/4" jack that completely bypassed the balanced input for home Hi-Fi use — which is probably what most of you reading this want. 

The D-75A also has a Mono mode, but you have to open the case to switch it.

Crown offshored the D-75A to China in its last days before it was discontinued in 2014. It's best to avoid the newer D-75A, even if it looks cooler in black.

If you want a compact, inexpensive, indestructible professional amplifier, there are many reasons that this has been the world's most popular professional amplifier for decades.

It works great to power any desktop or nearfield system, and with its IOC LEDs lighting up before any significant distortion takes place, it's safe to use this where you might need more power. With the IOC LEDs, you always know if you're distorting or not. You can use all the power this amplifier has, regardless of load, and not have to play it softer to stay safe. Unlike consumer amplifiers, play it as loud as you want, and so long as the IOC LEDs don't light, you're not at the edge.

Most people don't realize that 35W is plenty of power for just about anything. A 100W amplifier only goes about one volume control click louder, and with the IOC LEDs you can use all of this amplifier's power without fear of distortion.

It also works especially well as a dedicated high performance headphone amplifier, with far more output and lower output impedance than any other dedicated headphone amplifier.

Enjoy!

Dual-channel (stereo) amplifier can optionally be configured to deliver double the power from a single (mono) channel. It also provides the following features:

• Powerful AB+B class circuitry yields maximum efficiency with minimum crossover “notch” distortion.
• IOC® (Input/Output Comparator) alerts of any distortion that exceeds 0.05% to provide proof of distortion-free performance.
• Signal presence indicators verify the presence of amplifier output.
• Detented level controls for precise repeatability.
• Ultra-low harmonic and intermodulation distortion result in the best dynamic transfer function in the industry.
• Very low noise and wide dynamic range.
• High damping factor provides exceptional loudspeaker motion control.
• Convection cooling system eliminates fan noise and maintenance.
• Mounts in a standard 19-inch (48.3-cm) rack.
• Front-panel headphone jack.
• Three Year, No-Fault, Fully-Transferable Warranty completely protects your investment and guarantees its specifications.

Rated Output Power 
8Ω Stereo: 35 WPC (15.44 dBW), 20-20,000 Hz at less than 0.05% THD (40 WPC (16.0 dBW) at 1 kHz at 0.1% THD).
4Ω Stereo: 45 WPC (16.53 dBW), 20-20,000 Hz at less than 0.05% THD (55 WPC (17.4 dBW) at 1 kHz at 0.1% THD).
8Ω Mono: 95 watts total (19.77 dBW), 20-20,000 Hz at less than 0.05% THD; 110 watts total (20.41 dBW) at 1 kHz at 0.1% THD).
It has a standard unregulated linear power supply that provides ± 30 V DC rails with twin 10,000 µF 40Vcapacitors.

Inputs 
Two balanced XLR, 20k Ω (10k Ω if you use only one side for the wrong kind of balanced input).
Two mono ¼" unbalanced, 25k Ω.

Input Sensitivity
812 mV ± 2% for 35W into 8Ω.

Frequency Response
20 ~ 20,000 Hz ± 0.1 dB at 1 watt. 

Phase Response
20 ~ 20,000 Hz, +10º -15º at 1 watt. 

Signal to Noise Ratio
106 dB below 35 W (15.44 dBW) into 8Ω.
This is -90.56 dBW or 875 pW or 83.85 µV or -81.53 dBV.

THD
< 0.001% from 20 ~ 400 Hz from 10 to 250 mW, increasing linearly to 0.05% at 20,000 Hz at 35 W.

IMD
< 0.05% from 10 to 250 mW.
<0.01% from 250 mW to 35 W.

Slew Rate
6 V/µS.

Damping Factor
> 533 damping factor into 8 Ω.
< 15 mΩ output source impedance.

Output Connectors 
Lab standard 3/4" spaced 5-way binding posts.
Designed for standard MDP lab connectors.

Quality
Made in Elkhart, Indiana, USA. 

Power Input
120 VAC ± 10%, 50 ~ 400 Hz.
Internal taps also for 100 V, 200 and 220 V (all ± 10%).
NE2H neon pilot light with 27k Ω dropping resistor.

Rated Power Consumption
15 W idle, 240W max.
2A rear-panel fuse and 2.5A internal fuse.

Size
1 RU.
1.75 x 19 x 8.375" HWD, depth is behind mounting flange.
45 x 483 x 223 millimeters HWD, depth is behind mounting flange.

Weight
10 lbs. (4.53 kg).

Export
Crown labled their export models as Amcron, not Crown.