Is an isolation transformer better than a power conditioner?

@mglik 

Given my long term experiences I'd encourage you to go the route of the balanced AC transformer via Equitech. I have not heard theirs specifically  but the principle/concept is good and the brand is well regarded. I've used the BPT 3.5 Signature plus (Balanced AC PC/isolation transformer) for over 13 years and it is excellent in my opinion. Every component is plugged in to it including my SET amplifiers. They all sound noticeably better than when  plugged into my 20 amp dedicated line wall circuit. I am a very firm proponent for  balanced AC electrical power for audio components.

Charles

Personally I like dedicated lines into the sound room and furutech receptacles and power cords all these I find far better than any power conditioner I bought or tried. Regards

As an electronic engineer, I feel that power conditioners should not be necessary. The power supplies inside quality audio kit should be able to reject any noise on the powerline, it's flawed if it can't! Where there may be a benefit is with main AC driven turntables, where noise may be transmitted to the motor.

'Improved but not dramatically'

I posit that such a perceived change not further described is highly likely to be the result of expectation bias and not an objective sound improvement.  The description is low-key and unexciting, expressing disappointment and not satisfaction.  Non-specific and not recognising any particular change in the sound.  A sop to the supplier who took the dollars and a false justification to assuage the dollars spent.