SWITCH HI END PER DUE AMPLI E DUE COPPIE DI DIFFUSORI A ROMA

Costruzione senza compromessi, ho molte foto le invio agli interessati. il miglior ed unico switch hi end per poter avere collegati due amplificatori e due coppie di diffusori e poterli ascoltare incrociando le possibilita'. costruzione ai massimi livelli. di seguito la descrizione del produttore: stereo amplifier/loudspeaker switch box. the difference to the multitude of a/b switch boxes available today is that this new switcher must allow valve amplifiers and/or transistor amps to be used transparently. as you will know, if you leave a valve amplifier without a set of loudspeakers connected then the output stage will destroy itself causing an extensive repair bill. wish list: 2 x stereo amplifiers - valve and/or solid state transparent 2 x sets of stereo loudspeakers common earth for all negative amplifier and loudspeaker connections each amplifier can drive speakers 1 or speakers 2 each amplifier can drive speakers 1 and speakers 2 without changing the impedance load to the amplifier each amplifier has 2 x 4 ohm dummy loads connected if it is switched out of circuit there must be no switching noises through the loudspeakers the switch box must be musically transparent. the switch box should be capable of switching up to 10 amps (1kw) per channel. it should be impossible to switch 2 x amplifiers back to back! designing such a simple yet complex circuit has been a challenge. free standing push button switches and toggle switches cannot safely take the power! relay drive is the best solution - so that the controlling switches can be miniature toggles. a power supply to drive the relays is required but, should this fail - then the amplifiers must see the dummy loads by default. housed in a lovely chinese black anodised case width 226mm (9 inches) height 70mm (2.75 inches) depth 271mm (10.75 inches).