Thiel Owners

I had a similar experience with the bass in my 3.7s sounding a bit weak.  I got out my measurement mic and real time analyzer to measure it and it measured fine on sine waves.  Still, it bothered me enough that when the store I bought the amp at was selling off their demo I bought it and ran two amps bridged mono.  The difference was pretty striking.  Even at moderate volumes the difference in definition was very noticeable.  I don't know if doubling the power supplies or capacitance or what made the difference but the improvement was big enough that I didn't second guess having spent the money.  

@tomthiel, I've used Mark Levinson ML331's and Krell KAV250 with the Thiels before and the Bel Canto REF500M mono blocks are definitely better than either of those. Especially in the bass and mid-bass. I don't think it's the amp.... I can borrow a few different amps from friends and test your theory, but I don't think that's it.

@jon_5912, the amps are mono blocks already, so I'm already there... :-)

Just suggesting that particular impedance issue.

@jon_5912 ,What amps are you using in bridged mono? I'm thinking of adding another Classe CA-300 and doing the same thing with my 3.7s.

I'm using a pair of Cambridge 840s.  They're a lot smaller than the CA-300.  Their combined power is probably comparable to a single CA-300.  I have my doubts about whether a pair of CA-300s would be significantly better than one.  That's 1,700 watts/channel into 4 ohms, a lot more than you can get out of the wall.  

I used to use a pair of Classe CA-200s but they both developed some intermittent crackling that the shop couldn't fix so they've sat unused for about the last 8 years.  They are very good and powerful amps but they definitely have a bit of a warm sound.  I prefer the sound of the Cambridge amps as I find them a bit more neutral.  The build quality isn't as good as it's a Chinese made, more budget conscious brand.  They've operated flawlessly for about the last eight years so I can't complain.