I have the exact same question. I dealer told me that the mono 120's sound fantastic, but the did not have the v4's for a direct comparison. Hope somebody in the forum can help.
I have Quicksilver V-4 amps and they sound great with all speakers I have used with them. They run cool for tube amps, and it is easy to adjust bias, which I check occasionally and does not usually require adjustment. I have not heard the Mono 120, but would guess it sounds similar.
+1, Hard to go wrong with the V-4's. Had them in SE and Balanced version. They get the tone right, which I think some designers may be losing touch with. I have not had the opportunity to hear the Mono 120's.
I have heard the original v4 that were 135 w or something like that and they are great . Would love to hear the 120's.... I am sure they are great. The new 60 watt Quicksilvers are more my speed. I own a pair of Mid Monos and would buy another Quicksilver in a heartbeat. They are great amps. Look past the plain exterior, they are built like a tank , are super reliable , and sound great. Huge value for the $$$
Randy at Optimal Enchantment in Santa Monica has extensive experience w Quicksilver...suggest a call...he has been a trusted advisor to me for many important system decisions...
I had V-4's with 3A Sigs & two 2Wq subs the sound was very enjoyable. They were easy to run and problem free, great amps. Randy is the man I went often to visit, listen and learn. I've purchased cables, my Basis 2500, Air Tight PC 1 and all kinds of AudioQuest wire from Randy.
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