BPT 3.5 Signature vs. 3.5 Sig PLUS

The PLUS is more extended and neutral as well as more dynamic, it's not as dark and colored.

Thanks, Owl. The characteristics of the Sig you describe are what bother me somewhat about the conditioner. Do you own the 3.5 Sig PLUS?

Yes, and I'd highly recommend if you have the non plus to do the upgrade. It brings in all the good of the BPT Sig and none of the aformentioned characteristics that in some systems may not strike the best balance. To me it sounds like a completely different unit, not just an "upgrade". In my opinion it's a no brainer. Truly one of the best values in audio I've EVER found and easily worth the money. FWIW, I don't run my amps through it, but everything else goes through it.

I have owned both units as well. My findings are similar to Owl's. The BPT 3.5 Signature was excellent, however a bit closed in on top, or perhaps a bit dark overall. The 3.5 Signature PLUS not only seems more neutral in overall character, there is more extension in both treble and bass, and the noise floor is even quieter - no joke. I have my amps plugged into the unit, and Chris Hoff at BPT gave me the tip to try the amps plugged into both the "amp" plugs as well as the duplex next to it, as one has different sonic characteristics than the other, and system matching will determine which works best...

I personally feel the upgrade between the 3.5 Sig to the 3.5 Sig Plus was well worth the cost difference.