Rated Output Power

8 Ω Stereo

80 watts (19.03 dBW) minimum per channel  from 1 ~ 20,000 Hz at 0.05% THD or less.

95 WPC (19.78 dBW) on the back of the performance sheet or 90 WPC (19.54 dBW) in Crown’s manual at 1 kHz at 0.1% THD.

You’ll see also that Crown elsewhere refers to rated power as 75 WPC (18.75 dBW), especially where it refers to sensitivity.

4 Ω Stereo

125 watts (20.97 dBW) minimum from 1 ~ 20,000 Hz at 0.05% THD.

145 to 155 WPC (21.61 ~ 21.90 dBW) at 1 kHz at 0.1% THD.

8 Ω Mono

315 watts (24.98 dBW) at 1 kHz at 0.1% THD.

16 Ω Mono

160 watts (22.04 dBW) minimum from 1 ~ 20,000 Hz at 0.05% THD.

180 watts at 1 kHz at 0.1% THD.

Output Loads

4Ω, 8Ω and 16Ω.

Safe with any load, including shorts — open circuits and reactive loads — although it will kick-in its protection circuitry with 2Ω loads.

Topology

It has a standard unregulated linear power supply with ±45V DC rails and dual 9,400 uF 50V capacitors, and an extra low-current 55V rail to help in biasing.

Class A + AB.

The drivers operate in class A at low levels. The output transistors don’t turn on until the output demand it, at which point they are class B. The drivers handle all the zero-crossings.

Like almost all Crown linear amplifiers, it’s based on the 1968 patent for the DC-300, and you’ll see “patent number 3,493,879” on the back.

There’s an operational amplifier at the front end, and the IOCs light if the error output of this operational amplifier exceeds a certain value.

Input

Two mono ¼” unbalanced phone jacks, 25 kΩ ± 30%.

The inputs feed 25 kΩ potentiometers directly, whose outputs feeds the amplifier.

Input Sensitivity

1.19 V ± 2% for rated power into 8Ω.

Sad part is Crown never really comes out and tells us the rated power for this D-150A Series II version.

Since its gain is 20.6x (26.28 dB), 1.19 V in gives us 24.514 V out, or 75 watts for rated power.

There’s an internal jumper to increase the gain to 0.775 V sensitivity.

Frequency Response

DC ~ 20,000 Hz ± 0.1 dB at 1 watt.

DC ~ 100,000 Hz ± 1 dB at 1 watt.

Phase Response

DC ~ 15,000 Hz, +0º -15º at 1 watt.

Signal to Noise Ratio

110 dB below “rated power” into 8Ω, 20-20,000 Hz measurement bandwidth.

If you take rated power as 75 W (18.75 dBW), this means -91.25 dBW or 750 pW or 77.46 µV or -82.22 dBV of noise.

If you take rated power as 80 W (19.03 dBW), this means -90.97 dBW or 800 pW or 80 µV or -81.94 dBV of noise.

THD

< 0.001% from 20 ~ 400 Hz, increasing linearly to 0.05% at 20,000 Hz at 80 W.

IMD

< 0.05% from 10 to 250 mW.

<0.01% from 250 mW to 80 W.

Slew Rate

6 V/µS.

Damping Factor & Output Impedance

> 400 damping factor into 8 Ω from DC to 400 Hz.

< 15 mΩ in series with < 3 µH 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, 220 and 240 V (all ± 10%).

Red LED power light, although it looks amber when off.

3-wire 5-foot captive cord.

Rated Power Consumption

Less than 40 W at idle, 750 W max.

MDX 6.25A rear-panel fuse.

See also Actual Power Consumption.

Size

3 RU, 8″ deep measured.

5.25 x 19 x 8.75″ HWD, depth is behind mounting flange.

133 x 483 x 222 millimeters HWD, depth is behind mounting flange.

Weight

24 lbs. (10.9 kg).