Hafler	Manufacturer	Model	Comments
	Hafler Arizona, USA Website	DH110 Preamp DH500 Poweramp (with original owners manuals)	Reviews "Simply put, this amplifier will hold its own with many of todays well respected high end 2 channel amps costing more, much more." Modifications

Hafler DH-500 Power Amplifier 839 kb

Power Rating: Less than 0.025% total harmonic distortion at any power level up to 255
watts continuous average power per channel into 8 ohms at any frequency between
20 Hz and 20 kHz with both channels driven.
IM Distortion (SMPTE): Less than 0.007% from 1 watt to 255 watts into 8 ohms
Typical THD at 255 watts into 8 ohms: 1 kHz-0.002%; 10 kHz-0.007%
Frequency Response into 8 ohms: -3 dB, 0.5 Hz to 120 kHz at 1 watt
kO.5 dB, 5 Hz to 40 kHz at 255 watts
Typical Channel Separation at 1 kHz: 60 dB
Signal to Noise Ratio: Exceeds 100 dB referred to 255 watts into 8 ohms, unweighted
Exceeds 90 dB referred to 1 watt into 8 ohms, A weighting
Input Impedance: 47,000 ohms
Input Sensitivity: 2.35 volts for 255 watts into 8 ohms; 0.145 volts for 1 watt
Damping Factor: 200 to 1 kHz into 8 ohms; 60 to 10 kHz into 8 ohms
Rise Time: 10 kHz, 80 volts p/p square wave, 10% to 90%: 2.5 us.
Slew Rate: 1 kHz, 120 volts p/p square wave: 45 V/us.
Semiconductor Complement: 27 transistors, 12 power Mosfets, 33 diodes, 8 zener diodes,
one integrated circuit, one diode bridge.
Power Consumption: 240 VA quiescent; 1200 VA @ rated power into 8 ohms, 2 channels
Size: 7-l/4” high, 19” wide, 13” deep including handles
Net Weight: 45 lbs.
Shipping Weight: 49 lbs.

Hafler DH-110 Pre Amplifier 928kb

The numbers in parentheses refer to the paragraph in the IHF specifications manual which defines the test procedure.
PHONO PREAMP SECTION
Rated Output: 3 Wms, 8 Hz-105 kHz
Maximum Output (3.5): 12 Vrms, 20 Hz-20 kHz at recording output
Total Harmonic Distortion: Less than 0.0006% @ 1 kHz, 3 Vrms
Frequency Response (3.13): +0, -0.25 dB, 20 Hz-20 kHz
RIAA Equalization Accuracy: +0, -0.1 dB, 30 Hz-15 kHz
Full Power Bandwidth: -6 dB, 4 Hz-210 kHz
Sensitivity (3.7): 12.5 millivolts
Maximum Input Signal @ 1 kHz (3.8): 300 millivolts; [3 V @ 20 kHz]
Gain: 34 dB @ 1 kHz
Input Impedance: 47,000 ohms in parallel with 30 pF; user adjustable.
Plug-in capacitors are installed to increase this
to 150 pF on Phono 1; 250 pF on Phono 2
Signal to Noise, weighted (3.12): 87 dB
Slew Rate: 12 volts per microsecond
LINE AMPLIFIER SECTION
Rated Output: 3 Vrms, 4 Hz-210 kHz
Maximum Output (3.5): 14 Vrms, 20 Hz-20 kHz
Total Harmonic Distortion (3.4): Less than 0.001%, 20 Hz-20 kHz
Frequency Response (3.13): +0, -0.1 dB, 20 Hz-20 kHz
Full Power Bandwidth: -6 dB, 2 Hz-420 kHz
Sensitivity (3.7): 50 millivolts
Maximum Input Signal @ 1 kHz (3.8): 14 Vrms; volume control @ -20 dB
Gain: 20 dB ± 1 d B
Input Impedance: Greater than 25,000 ohms
Signal to Noise, weighted (3.12): 90 dB
Slew Rate: 12 volts per microsecond
Rise Time: 2.5 microseconds maximum, Phono in / Line out, 10 Vp-p,
1 kHz square wave; load is 10,000 ohms in parallel with 10 nF
Crosstalk (3.14): down 72 dB, any input to any output
Separation (4.2): greater than 82 dB @ 1 kHz; greater than 52 dB @ 20 kHz
Gain Tracking Error (4.4): less than 0.5 dB
Maximum Output Noise: less than 350 microvolts, wideband
less than 95 microvolts, ‘A’ weighted
[with 1 Kohm input termination, volume full CW]
Bass Control: 217 dB @ 20 Hz, moving inflection, variable turnover
Treble Control: ±17 dB @ 20 kHz, shelving @ 5 kHz, fixed turnover
Filter Response: -3 dB @ 25 Hz; -6 dB @ 15 Hz; -12 dB @ 8.2 Hz; -25 dB @ 3 Hz
Filter Cutoff (3.13.2.2.1; 3.13.2.2.2): 25 Hz; -12 dB/octave
GENERAL SPECIFICATIONS
Semiconductors: 30 transistors, 3 ICs, 12 diodes, 2 LEDs
Inputs: 2 Phono, Tuner, Compact Disc or Video, 2 Tape recorders, EPL
Outputs: 2 Tape (buffered), 2 Line, EPL, Headphone Jack
Controls: Volume, Balance, Bass, Treble, Input Selector, Phono l/2 Selector,
Monitor Selector, Mono-Stereo, Filter, External Processor Loop,
Tone Control Engage, Power
Intermodulation Distortion: Both SMPTE and CCIF IMD at operating
levels from phono input to line output are below the
residual of currently available instrumentation
AC Supply Voltage: 100-130 and 200-260 VAC, 50/60 Hz
Power Consumption: 3.5 watts
AC Convenience Outlets: 3 switched, 5 amp continuous, 72 amp surge
1 unswitched, 5 amp continuous
Size: 17” wide x 3” high x 8½” deep
19” rack mounting accessories included
Shipping Weight: 12.5 lbs.
Net Weight: 10 lbs.