audio research
D-52

Description
Solid state stereo power amplifier.

Introduced
1978

Discontinued
1980

Revisions
D-52B (1979)

Options
-

MSRP (US new retail)
D-52: $995
D-52B: $1,295. Later increased to $1,395.

Specifications

D-52B:

Power output 50 watts per channel minimum RMS (both channels operating) at 8 ohms from 1 Hz to 20 kHz with less than .25% total harmonic distortion. Typically less than .02% at rated power in midband. Approximate actual power available per channel at "clipping" (both ch. op.): 80 (4 ohms), 60 (8 ohms), 35 (16 ohms)
Power bandwidth  
Frequency response 0.05 Hz to 100 Khz (-3 db)
Input sensitivity 1.1 Volts RMS for rated power and load.
Input impedance 30 Kohms (nominal).
Output taps  
Output regulation  
Overall negative feedback  
Damping factor More than 500 at rated power and load (20 Hz to 20 kHz). (Effective internal impedance approximately .012 ohms.)
Distortion Intermodulation distortion: Less than .1% at rated output (56.56 V p to p) and load (SMPTE method). THD and IMD both decrease with decreasing output.
Slew rate  
Rise time  
Hum & noise Wide-band, unweighted, more than 90 dB below 50 watts at 8 ohms - power line components (hum) more than 80 dB below 50 watts at 8 ohms.
Power supply energy storage  
Power requirements 105-120/210-240 VAC, 50/60 Hz, 600 watts maximum. 120 watts at idle. 300 watts at rated power.
Other  
Dimensions 19" (48 cm) W x 5 ¼" (13 cm) H (standard rack mount panel size) x 10 ½ (26.7 cm) D (front panel back). Handles extend 1 ½" (3.8 cm) forward of the front panel.
Weight 39 lbs. (17.7 kg) Net, 45 lbs. (20.5 kg) Shipping

Reviews

Number 14 (D-52: Full Review), Number 15 (D-52B: Full Review)

Pictures

D-52:

D-52B: