Center Defeat Bass and Treble Tone Control
The bass and treble controls provided on A-420 are specially designed with a center defeat position. When set to their center positions, tone control response is perfectly flat, with no influence on the original signal. When tuned for either a boost or cut, they provide smooth, accurate response over a conveniently wide range.
Subsonic Filter
A switchable subsonic filter is provided on the A-420, a subsonic filter is built into the phono equalizer amplifier stage, providing the same performance benefits automatically, whenever the amplifier is reproducing a phono source.
Independent Speaker A/B Selectors
The A-420 provide rear panel connectors and front panel selectors for two separate pairs of speakers. They can be driven independently or simultaneously, allowing you to drive two remotely located speaker pairs together, or to drive a dual speaker pair setup in a single listening environment, for more listening flexibility.
Specifications
Minimum RMS Output Power per Channel: 50 Watts (8 Ω ) from 20 to 20,000 Hz at no more than 0,015% thd
Dynamic Power per Channel (IHF) : 85 W (8 Ω ), 115 W (4 Ω ), 120 W (2 Ω )
Power Bandwidth (Half Rated Power, 8 Ω ): 10 to 50,000 Hz (0,05% THD)
Damping Factor (1 kHz, 8 Ω ): no more than 50
Input Sensitivity/Impedance
Phono MC : 160 µV/100 Ω
Phono MM : 2,5 mV/47 k Ω
CD, Video, Tape : 150 mV/30 k Ω
Maximum Input Level
Phono MC : 11 mV (0,02% THD)
Phono MM : 155 mV (0,02% THD)
Output Level /Impedance
Rec Out : 150 mV/600 Ω
Headphone Jack Rated Output/Impedance (8 Ω ): 0,7 V (0,015% THD)/220 Ω
Frequency Response:
CD, Video, Tape : 20 to 20,000 Hz +0 dB -0,5 dB
RIAA Equalization Deviation (20 to 20,000 Hz)
Phono MC RIAA : ± 0,8 dB
Phono MM RIAA : ± 0,5 dB
Total harmonic Distortion:
Phono MC to Rec Out (3 V) : 0,01%
Phono MM to Rec Out (3 V) : 0,007%
CD, Video, Tape to Sp Out : 0,01%
Intermodulation Distortion (8 Ω )
CD, Video, Tape : 0,005% (1 W), 0,01% (half Rated Power)
Signal-to-Noise-Ratio: (IHF-A Network)
Phono MC (500 µV input Shorted) : 74 dB
Phono MM (5 mV input Shorted) : 90 dB
CD, Video, Tape (input Shorted) : 100 dB
Signal-to-Noise-Ratio: (new IHF)
Phono MC (500 µV input Shorted) : 72 dB
Phono MM (5 mV input Shorted) : 76 dB
CD, Video, Tape (input Shorted) : 85 dB
Tone Controls
Bass Boost/Cut : ± 10 dB at 20 Hz
Turnover Frequency : 350 Hz
Treble Boost/Cut : ± 10 dB at 20 kHz
Turnover Frequency : 3,5 kHz
Loudness Control (Level Related Equalization): -20 dB
Dimensions (W x H x D): 435 x 112 x 327 mm (17-1/8” x 4-3/8” x 12-7/8”)
Weight: 5,9 kg (13 lbs)