These was Valvet’s second from the top monoblock amps. They are not your typical full width chassis units but more like show box width units. So you could still fit both monoblocks on a single shelf but height might be an issue if the height between shelves on your rack is under 10″ (each monoblock set is approx 9″ wide, 4.5″ tall and 13″ deep). Power output is 55W in 8 ohm and 90W in 4 ohm. They operate in Push-Pull Class A mode where they share the same warm mid-range, sweet highs you get from tubes but with a faster, tighter sounding bass. Power delivery was immediate and smooth with great flexibility across the music’s bandwidth. A high resolution preamp is an ideal partner with the A4 if you want the sheer transparency of the music or a high end preamp if you prefer your musical presentation organic and warmer in nature. We had their flagship A4e quad chassis monoblock amps before and although they have a bit more power, they are both barely discernible in sound quality. You would really nee to nit pick to say the A4e is better. These amps are hand crafted in Germany and the quality workmanship is evident here. Previous owner ordered them with an additional pair of speaker binding posts so he could bi-amp his speakers.
Cosmetically, the units look almost good with just minor scuff marks here and there. We don’t have the original box for them but can securely pack them for safe shipping.