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.
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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Hi @johnnybwood I have the Fosi V3 mono, but mine is being used to drive my home theater setup only. I started with this amp because it has good reviews and is inexpensive. after I purchased it, I read of OP-amp rolling, so I did jump in the bandwagon Well, I can tell you, it does (OP-amp rolling) improve on the V3 sonics. IMHO, the opamp rolling improves about 20 to 30% based on what I hear. The opamps I use are the Sparkos SS3602 for the final drive and Burson Vivid v7 on the pre-drive stage. I like this combo rather than a full sparkos as the Vivid seems to add body to the instruments and the Sparkos is a dynamic op-amp As again, YMMV as 20 to 30% (estimated) improvement may not be much BUT you can hear it. You also mentioned that you have the Klipsch RP600m2, which I have as my Horn reference speaker. I actually used the Klipsch to verify what I hear is true or just imaginative. Yup, OPamp rolling is like tube rolling, it does make a difference. The V3 are in my home theater driving the L/R speakers, and they are B&W 707. I'm impressed that the V3 can drive this 84db sensitive speakers to loud enough levels and the clarity is amazing. You claim you have the Za3, which I am not familiar with. just be extra careful when you choose the Burson opamps. it has a tall heat sink, which can pose a problem on the Za3 case. based on the comments above, I suggest you get a pair of sparkos and pair of Vivid v7. On a single amp, try a combination of the opamps and listen on your Klipsch what sound you like. note, sparkos are dynamic, Vivid V7 are detailed and has body and Rp600MII are detailed/shouty. another note, that opamp for the balance input and single ended, (it's the one closest at the back panel) does NOT have any effect (to me hearing) when I am using balanced input connection.
good luck
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so you're saying swapping didn't yield any benefit on the balanced input stage, only RCA? Just amplification stage? I was looking at the vivids so I take a shot at those. The za3's have enough height inside the case for those. I didn't the v3's would have room. Shouty is an apt description of those speakers. It's quite a departure from the sound of my electrostats but I like mixing up listening experiences. Hearing things in a different way. |
yes, swapping the opamp close to the input side of the amp did not (I could not discern a tonal difference). If there was, I was not able to detect it. Note, I am using a balanced XLR. However, the opamps that were close to one another which was more in front of the amp, has most impact. So, in my particular configuration, I find that the Vivid v7 position was closed to the front, while the Sparko was towards the middle of the amp board. Swap it around and listen which best suits you |
if I’m to understand what I’ve been reading the op amp in the back is to convert the RCA input to a balanced signal so I believe it can be removed from the unit if using XLR. I've ordered two pairs of V7 classics to try on the Two amps running dual mono biwired. I'm hoping they will take some of the hard edge off the speakers and give a more analog feal from the system. Will be reporting back next week. Cheers! |
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