I used to have a pair of FOSI V3 Monos where I settled on the MUSES02 op-amps after trying the Sparkos. They were reasonably priced (relatively) and sounded the best to me.
op amp rolling
https://photos.google.com/photo/AF1QipO7mVKfzW_dSV5rxCvMv4z2gwdtk1cLM3eSFhIy
I have a setup for a send system that I have been playing with to see what I can do on the cheap and I've been quite surprised at the result so far. I've been reading about supposedly major improvements in performance of the Fosi ZA3 amps with op amp swaps. I'm wondering if anyone else has had any experience with the various ones available. I'm running the dual mono with XLR on each speaker bi wired to max the power which means I'll need three per amp which will cost more than the amps so I'd like to get it right the first time if I can. I'd like to take some of the sibilance from the top end which some I reckon comes from the nature of the speakers (Klipsch RPM 600II). Any opinions/advice would be most welcome. I'm looking at the Burson v7 vivid and the sparko but the sparko has been reported as softening the ZA3 too much which the reviewers on youtube seem to like for the V3 mono but not for the ZA3. I have attached a link to the setup because I cand figure out how to attach the photo to this forum. Thanks in advance
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Using the Node icon for all the frontend duties eArc for video stuff and a cheap Sony Blu Ray player just in case. Pretty bare bones but that was the point. 2500. Total investment! The result is still surprisingly good! Just thought swapping out the op amps might take some of the digitallyness off the amps lol. Not a word- I know! |
https://forum.audiogon.com/users/johnnybwood There are five op amps inside the fosi ZA3 - one for each channel (2), one for the sub out, and one for each input (RCA and XLR). If you are decided on your output and running them as monoblocs, you only need two new op amps and can pull the extraneous ones. That means you only need to purchase four op amps, or two pairs. Put one in the XLR or RCA slot, and one in the right (mono) channel out. I thought the sound became more alive, expanded the dynamic range. It puts the high end in your face a bit, but not bright. They are aptly named vivid. For $160 or so per pair, it was worth the punt and totally worth it for the project and education on Class D. Is it worth the sound? For me, totally. |
Thanks! I've been looking at the vivids. I'm running one dual mono for each speaker with XLR splitters and biwire to maximize the output. Tried them mono non-biwired not nearly as defined and lost there punch so I feel splitting is worth. That will mean three pairs of op amps. Iv3 heard theonos are brighter than the za3's so don't think I will go that way. |
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