I bought my adapter on ebay years ago. It was only $40 USD. You should check your local ebay listings, you should be able to find something. I never liked the bulk of the adapter and the XLR end of the headphone cable cluttering my desk. Eventually I found a cable maker on Etsy that terminated...

I have this ebay adapter and it works as expected. For me, it definitely widens the soundstage a tad and stereo separation is improved.

I would say after going balanced, the soundstage became tad wider and stereo separation was a bit better. It sounded a little more open/better overall.

I bought my adapter from a seller in Georgia last year. I haven't had any problems with it: https://ebay.us/Lsh1cc

I have both the balanced adapter and the Sbooster MK. II and both offer significant improvements. The balanced adapter definitely widens the soundstage and, at least for me, makes things a tad more detailed. The Sbooster was a more readily noticeable improvement even with no burn in.

I e-mailed sbooster about this and they thought that 13 was best, but yes, any voltage works. It's your preference.

That's a bold statement!

Yeah. Looks like a real rookie mistake.

I'm sure the actual voltage is somewhere on the label too.

Well damn...I set the output voltage to 13.2V. It's even better! I immediately noticed a wider and deeper soundstage. Everything sounded more airy too.

Just for due diligence, did you double check that you did in fact get the 120V version from the sticker on the body?

Bad luck! At least it didn't damage your B+. Where did you get your sbooster from?

@AlanU I applaud your DIY skills. This definitely is not for me. I just connected my Sbooster an hour ago and going through my reference tracks. I will break in at 12V first based on Sbooster's tech support. Definitely an improvement! First thing I noticed was that the noise floor is much...

Just to standby mode.

I submitted a support ticket over the weekend. Looks like I found a bug. This was their response: Hello Kerwin, Sorry for your inconvenience. It seems that you discovered a bug. I will inform our R&D team about that. Thank you for letting us know. Best regards Wojtek