(SOLVED) Need help with Burson Soloist 3xp opamp swap and DC offset

I ordered the sparkos SS3602 dual op amps and wanted to swap them into the input stage.

I tried to be careful, I let the burson stay on for a full day before measuring. When I finally did measure I got around 60mv of DC offset on the xlr and single ended out. That seemed way off to me as I heard early in the thread that I should measure 1-5mv stock.

So I started turning the blue trim pots on the burson to see if I could lower it. I turned them to the left, and mv went up, so I turned them to the right, it started going down, but then I couldn't seem to get it any lower than 30mv. I turned some of them back to the left and eventually was able to measure around 17mv on both channels through both xlr and single ended.

When I plugged in headphones, the small pop I would always hear was now almost completely gone. "This is a good thing" I thought. So I then swapped in the sparkos and mv was measuring about the same. Started listening, and things were fine. Then I swapped back to the V6 vivids and things were also fine. But I did now hear a very small pop again when plugging in.

I swapped to the sparkos one last time, and this time as soon as I plugged in there was a very loud pop in the right driver! I unplugged the headphones and measured again, left channel was now suddenly changing quickly from 0-10mv and back again, while right channel measured 28 VOLTS! Not 28 millivolts, 28 VOLTS!

I just remeasured again, and now suddenly things seem fine, both channels are around 20mv. What the hell is happening and what do I do to fix this? Burson has not responded to my emails other than saying they would get back to me when I first emailed them 2 weeks ago.

 

Not sure I can help you with the specific problem as I'm not familiar with any of that hardware. I can only wonder whether one of the OPAMPs went in backwards to give the 28V.

But DC offset on a balanced/XLR output doesn't really pass a logic test. How exactly did you measure that? The test there is voltage between hot and cold on a particular channel, and you don't measure to ground, because that's the whole point of a balanced connection. And unless something goes very, very wrong with the amp it will almost always be zero.

 

I have made sure I aligned pin one correctly. I admit, I am not knowledgeable in electronics just trying to figure things out the best I can. The way I am measuring is by connecting an XLR headphone cable I use for my Arya, it splits out into two mono jacks. The burson Soloist 3xp is known to have DC offset. Burson acknowledges it, and claims it to be intentional. There are four small blue trim pots that I understood were to be used to adjust DC offset.

I have tried contacting burson to receive instructions on how to op amp swap, but it has been two weeks, and all I got was a reply saying they would get back to me.

Op amp swapping was a feature that they sell the burson on. They should just have instructions in the manual, but they dont

 

https://imgur.com/a/eBsYYLw

 

After talking with Andrew from Sparkos and swapping op amps back and forth, I realized that the stock v6 vivids fit into the sockets much more securely than the sparkos ones.

So I thought maybe it's as simple as them not making a good connection, and bent the pins outward slightly, and this has fixed my issue!