Integrated 2/4 Channel Quadrophonic Amplifier
The 4VN-880 integrated amplifier features a 3 stage direct coupled equaliser circuit and NF type tone control.
The use of BTL connection enables the amplifier to double its power when it is used as a 2-channel amplifier.
In the first stage of the main amplifier there is a phase reversing circuit which reverses the phases of the input signals.
The original input signals go to the CH-1 and CH-3 amplifiers and the reversed phase signals go to the CH-2 and CH-4 amplifiers.
At output the signals are composed giving an output theoretically 4 times greater than in 4-channel playback.
Power output: 55W/ch into 8Ω (stereo), 25W/ch into 8Ω (quadraphonic)
Frequency response: 20Hz to 50kHz
Total harmonic distortion: 0.5%
Damping factor: 50
Input sensitivity: 2mV (MM), 100mV (line)
Signal to noise ratio: 65dB (MM), 75dB (line)
Output: 100mV (line), 30mV (DIN)
Speaker load impedance: 4Ω to 16Ω
Dimensions: 138 x 420 x 362mm
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Reviewed Aug 27th, 2015 by 99thDimension
Beautiful by design both in looks and in reproduction of sound. Currently hooked up to 5 way open baffle speakers. Using the four channels to bi-amp the speakers in a stereo set up.
This amp was in storage for a few years so a few precaution were taken before hand.
Using compressed air all internal boards and amplifier modules plus power supplies were blown back to like new condition.
Checked all capacitators for swelling and all soldier joints for any dark grey cold joints.
Rotated all pots at least 20 times from min to max settings.
Turning all pots to min and all switches to norm plugged the unit into sources and speakers.
Crossing fingers plugged amp into AC.
Waited 5 minutes took a good sniff all good.
Engaged power switch to on waited another 5 minutes took another sniff all good. Checked the heat sinks all cool to the touch.
Turn on source turn up volume to a guarter turn and left amp running that way for a half hour. Sniff again and check heatsinks warm to the touch all equal in warmth.
Turned amp up to halfway point spitty highs and boomy bass, to be expected the caps need to be recharged and biased by the power supply.
12 hours of running at half volume it turned into a sweet detailed sounding amp with a solid foundation on the lower octaves.
Puttin it through it paces from Jazz to Dubstep the soundstge was well defined and 3 demensional.
Imho the 4NV series of JVC was the golden era for JVC.
Reviewed Feb 01st, 2015 by Karl79
really good jvc quadraphonic amplifier!! I have one that still Works and sounds pretty good.! now seeking information about building speakers for this amp.