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Hafler DH-200
Power Amplifier (1980s)
© 2011 KenRockwell.com. All rights reserved.
Intro Specs Performance Measurements Compared Usage Recommendations
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 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 Infrasonic response, 0.1 Hz - 100 Hz.
-3 dB point: 0.53 Hz.
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 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
THD versus frequency, Hafler DH-200.
THD versus power level, Hafler DH-200.
Note extended scale to 0.0003% THD.
THD at maximum output levels: Hafler DH-200.
SMPTE IMD
SMPTE IMD, Hafler DH-200.
19+20 kHz DFD
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.
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 driving a pair of B&W Matrix 805 at 100 milliWatts.
Extremely enlarged vertical scale.
THD
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.
Rear, Hafler DH-200 Power Amplifier. enlarge.
Introduction top
Intro Specs Performance Measurements Compared Usage Recommendations
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
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
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.
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