I just put it out there to test, this isn't my final setup. I'm moving to a place where I'll have a huge room to dedicate for listening and I can't wait. Actually, I tested a few amps and surprisingly an old Yamaha AVR receiver putting out 75watts/channel made the speakers sound their best. The TT2 sounded very clean but was missing low end impact, even when connected to balanced outs - which was a surprise to me. I was hoping the TT2's 18watts/channel would be the perfect match for them considering how efficient they are.
Maybe you are confusing power and sound signature.
I presume that you are direct driving the speakers. The TT2 is producing a neutral sound signature, with no bass range artificially boosted by distortion, and the speakers are reproducing this.
Your old Yamaha AVR receiver may well have a sound signature with a boosted bass range, which your speakers then reproduced.
The speakers may have sounded good, but you could merely have been enjoying the distorted bass notes.
A higher impedance mismatch between amp and speakers can lead to more perceived bass with a bit more second-order harmonic distortion.
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