The DH-120 may shatter the illusions of some audiophiles in their search for perfection with ever larger, heavier and more costly amplifiers. It demonstrates once again that quality, not quantity, is the deciding sonic factor. Engineered for adequate power, proper headroom and excellent overload characteristics, together with conservative ratings, the DH-120 surpasses in sound quality many amplifiers of substantially higher advertised output.
To the technically knowledgeable observer, the DH-120 is quite elegant. Its novel drive circuit is extraordinarily linear. Its very low distortion is achieved with relatively little negative feedback. The oversized heat sinks and power supply, the careful selection of critical components for their sonic attributes, and the evident product quality demonstrates our commitment to excellence.
The most important design element is the utilization of power MOSFET output devices MOSFET advantages include self-stabilization robustness linearity, high speed, vaccum tibe-like characteristics and they require no thermal compensation. Because MOSFETs can handle heavy currents current limiting circuits are not required.
The audio enthusiast will appreciate the extra features which make the DH-120 more versatile than conventional amplifiers. Independent level controls on each channel are valuable for such applications as bi-amplification. For those needing higher power in a small package a back panel switch converts to a bridged mono mode which uses both channels to deliver in excess of 125 watts. If separate speakers are to be used in another area, a second set of speaker terminals is provided. Alternatively, these terminals can be switched to power rear speakers to add ambience recovery to the main system.
Hafler ingenuity has developed a uniquely simple and effective means of recovering heretofore inaccessible sonic details which have been hidden in many recordings and broadcasts. These elusive signals consist of reflected and reverberant sounds which contribute the sense of space and depth in the recording location. When these sounds are reintroduced through loudspeakers placed behind the listener using the Hafler Ambience Recovery System you will find a new sense of immediacy and involvement emerging from many of your familiar recordings.
Specifications
Power rating: less than 0,009% Total Harmonic Distortion at any power level up to 62 watts continuous average power per channel into 8 Ω at any frequency between 20 Hz and 20 kHz with both channels driven.
Intermodulation DIstortion (SMPTE): less than 0,005% from 1 watt in 62 watts each channel into 8 Ω
Total Harmonic Distortion : 0,002% (8 Ω , 1 kHz)
Frequency Response (at 8 Ω )
At 1 watt : 4 Hz - 200 kHz -3db
At 62 watts : 10 Hz -40 kHz +0 -1/2 dB
Typical Channel Separation:
20 Hz : better than 75 dB
1 kHz : better than 85 dB
20 kHz : better than 65 dB
Signal-to-Noise Ratio (Unweighted): exceeded 103 dB referred to 62 watts into 8 Ω
Input Impedance: 22,000 Ω
Input Sensitivity: 11 volts rms for 62 watts into 8 Ω
Damping Factor: 100 to 1 kHz into 8 Ω ; 50 to 10 kHz into 8 Ω
Rise Time: 10 kHz, 45 volts peak to peak square wave, 10% to 90%, 2 µs
Slew Rate: 10 kHz, 45 volts peak to peak square wave, 30 V µs
Semiconductors: 22 Transistors; 4 Power MOSFETs; 23 Diodes; 8 Zener Diodes; 1 Diode Bridge
Power Consumption: 62 watts both channels into 8 Ω , 300 VA
Dimensions (W x H x D): 15-3/8" x 3-1/2" x 9"
Weight: 18 lbs Net
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