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Hafler DH-200
Power Amplifier (1980s)
© 2011 KenRockwell.com. All rights reserved.

Intro   Specs   Performance   Measurements   Compared   Usage   Recommendations

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Hafler DH-200 Review

Right now, all I have is this lab report. Audition is still to come.

 

Hafler DH-200 Power Amplifier (about $150 used). enlarge. This free website's biggest source of support is when you use these links, especially this link directly to Hafler amplifiers at eBay (see How to Win at eBay), when you get anything, regardless of the country in which you live. Thanks! Ken.

 

August 2011   Audio Reviews   All Reviews

$330 new, kit form, 1981

80W idle warm power consumption.

thin skimpy power cord.

need harmonic series and 0.2 dB FR

 

Measurements

All measured driving an 8 Ω load at 1 Watt at 1 kHz unless otherwise stated.

All fed from the 5 Ω source impedance and measured with an R&S UPL laboratory audio analyzer unless otherwise stated.

 

Maximum Output Power at 1 kHz into 8 Ω load

126W at 120.3 V AC power input at 0.1% THD (1.66V RMS input).

135W at 120.6 V AC power input at 1% THD (1.738V RMS input).

 

10 ms burst of 1 kHz (10 cycles) at 1 per second: 50V Pk = 35.3V RMS = 156W Pk at 122.1V AC power input. Burst Input level: 1.85 V RMS.

 

Gain: 25.6 dB (19.07x)

Measured at 1 kHz, 1 Watt output into an 8 Ω load:

Sample
Left
Right
rocker
25.450 dB
25.763 dB

This calculates out to 19.07x gain.

148 mV in is 1W out into 8 Ω.

1.48 V is 100 W out into 8 Ω.

 

Frequency Response: +0, -0.1 dB

1 Watt output into an 8 Ω load:

Hafler DH-200

Hafler DH-200 Frequency response, ±1 dB scale.

Note about 0.3 dB channel imbalance, otherwise, easily within +0, -0.1 dB from 10 Hz - 20 kHz.

 

Hafler DH-200

Hafler DH-200 Infrasonic response, 0.1 Hz - 100 Hz.

-3 dB point: 0.53 Hz.

 

Hafler DH-200

Hafler DH-200 frequency response to 110 kHz.

-1 dB at 70 kHz.

-3 dB point in excess of 110 kHz, probably around 180 kHz.

 

DC offset: < 50mV

Left
Right
+29 mV
+48 mV

 

Noise: -83 dBV A

Hafler DH-200

Hafler DH-200 Output noise spectrum.

As fed from a 5 Ω source impedance, the Hafler DH-200 has more noise than an ADCOM GFA-545 II, but I've still never heard it, even with my head held to a loudspeaker.

 

A-weighted noise:

 
Left
Right
Input fed from 5 Ω source impedance
-81.2 dBV
-84.9 dBV
No input connection
-73.8 dBV
-77.6 dBV

 

Unweighted noise:

 
Left
Right
Input fed from 5 Ω source impedance
-77.8 dBV
-68.7 dBV
No input connection
-76.0 dBV
-57.9 dBV

 

 

Distortion: 0.0005% THD

THD

Hafler DH-200

THD versus frequency, Hafler DH-200.

 

Hafler DH-200

THD versus power level, Hafler DH-200.

Note extended scale to 0.0003% THD.

 

Hafler DH-200

THD at maximum output levels: Hafler DH-200.

 

SMPTE IMD

Hafler DH-200

SMPTE IMD, Hafler DH-200.

 

19+20 kHz DFD

Hafler DH-200

DFD at 1 Watt RMS, Hafler DH-200.

Difference-frequency distortion is extremely low at -104 dB, while a typical amp is at -90 dB.

 

Hafler DH-200

DFD at 50 Watts RMS, Hafler DH-200.

Exceptionally good performance at -100 dB. A typical amp might be around -95 dB here.

 

Driving a pair of B&W Matrix 805

Frequency Response

Hafler DH-200

Hafler DH-200 driving a pair of B&W Matrix 805 at 100 milliWatts.

Extremely enlarged vertical scale.

 

THD

Hafler DH-200

Hafler DH-200 driving a pair of B&W Matrix 805 at 100 milliWatts.

Distortion at low power seems to rise from levels seen at 1 Watt above driving a resistive load, however these readings are a result of the amplifier's noise at a lower power level.

My ears prefer not to tolerate driving the B&W Matrix 805 at 1 watt with sine waves in the lab; even at 100 milliWatts its louder than I'd prefer.

 

Damping Factors and Output Impedances

Output Impedances

Left
Right
50 Hz
59 mΩ
29 mΩ
1 kHz
61 mΩ
29 mΩ
10 kHz
98 mΩ
46 mΩ
20 kHz
160 mΩ
85 mΩ

 

Damping Factors at 8Ω

Left
Right
50 Hz
136
280
1 kHz
131
272
10 kHz
82
172
20 kHz
50
94

 

Method and raw data

Voltage drop when applying an 8 Ω load:

Left
Right
50 Hz
-0.0635 dB
-0.0310 dB
1 kHz
-0.0665 dB
-0.0319 dB
10 kHz
-0.1061 dB
-0.0503 dB
20 kHz
-0.1718 dB
-0.0920 dB

R source = (R load/attenuation ratio) - R load.

 

Hafler DH-200 Power Amplifier

Rear, Hafler DH-200 Power Amplifier. enlarge.

 

 

Introduction         top

Intro   Specs   Performance   Measurements   Compared   Usage   Recommendations

adorama

 
B&H Photo - Video - Pro Audio

Ritz Camera

I use Adorama, Amazon, Ritz, B&H, Calumet, J&R and ScanCafe. I can't vouch for ads below.

The

 

Rated Specifications         top

Intro   Specs   Performance   Measurements   Compared   Usage   Recommendations

±

Ω

µ

¼

½

¾

Input

3 VR

 

Output

8 VRMS

3 VRMS or more into 2 kΩ.

 

Frequency Response

20 - 20,000 Hz ±1dB.

 

Distortion

Less than 0.25%.

 

Internal Components

8 integrated circuits ("ICs").

28 transistors.

91 diodes.

 

Power

6-foot rubberized cord.

Unpolarized plug.

120 VAC.

50-60 Hz.

25 watts.

1/4 amp AGC fuse.

 

Size

9.5 x 5 x 11.8 inches, WHD, without wood case.

 

Weight

6 pounds (2.7 kg).

 

Warranty

Three years, parts and labor.

 

Price

$375, 1994.

 

Performance         top

Intro   Specs   Performance   Measurements   Compared   Usage   Recommendations

 

Overall

This cra

 

Measurements         top

Intro   Specs   Performance   Measurements   Compared   Usage   Recommendations

 

I used a state-of-the-art Rohde &Schwarz UPL for these measurements.

The traces are color coded for the Left Channel and the Right Channel.

 

Processors Bypassed

Phase Linear 1000 Autocorrelator frequency response

Gain vs frequency, Phase Linear 1000, processing bypassed, 200mV sine wave input. (measurement: Rohde & Schwarz UPL.)

I didn't separate the traces for clarity; there really is an 0.2 dB imbalance.

 

 

 

 

Compared         top

Intro   Specs   Performance   Measurements   Compared   Usage   Recommendations

Dynamic Range versus Data Compression

Dynamic range compression is when the differences between loud and soft are reduced. After dynamic rang

 

Usage         top

Intro   Specs   Performance   Measurements   Compared   Usage   Recommendations

Hafler DH-200 Power Amplifier

Rear, Hafler DH-200 Power Amplifier. enlarge.

See also the Hafler DH-200 Owner's Manual.

 

 

Recommendations         top

Intro   Specs   Performance   Measurements   Compared   Usage   Recommendations

Hey, for $150 or so, the

 

If you've found this report helpful, this free website's biggest source of support is when you use these links, especially this link directly to the Hafler DH-200 Power Amplifier at eBay (see How to Win at eBay), when you get anything, regardless of the country in which you live. Thanks! Ken.

 

More Information

 

 

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