Quote:
Originally Posted by mrarroyo 
MPX3 owner here, of the amps I have listened too the Supra and Balancing Act prototype sounded as good or better. However was not able to do a side by side so take my comments in stride. Need to listen to the ZDT and WA 5 LE.
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I heard them both within a few minutes of each other. The WA amp was smooth and refined. The ZDT was detailed, more neutral and faster, but not altogether lacking in character. The WA5 reminded me of my MPX3 Slam SE, but it was smoother.
I easily preferred the ZDT, but that is highly personal. It IS a different sound than the MPX3, but very engaging. The only tube to fiddle with is the driver, but you could perhaps add a bit more character to the sonics by using a US-made 1950s 5751 or even a 12AY7 which is quite dark with a marvelous tone for acoustic music. I don't know