Adcom 5500 worse than Adcom 545??

[FutureAudio]

I bought few adcoms amps from a guy locally for my polk HT system:

1x5500
1x5300
1x5200

1x545

Adcom 5500 sounds kinda harsh and not enjoyable at all while Adcom 545 sounds full and better than any of the other amps.

I'm using HK receiver as preamp. Is there something wrong with the system eg. do I need to get a better preamp like xiang sheng tube preamp or something?

What do you guys think?
I could use ANY suggestions or help.

Thanks in advance.

Ps. I'm using these to power 2xLsi15 ( PB10-NSD subwoofer directly through HK receiver )

[heiney9]

I have always prefered the original Adcom series and especially the 545. I had a 545 for close to 20 years.

It could also be the fact you are using an AVR for a pre-amp. The 5xxx series are Mosfet amps and while I prefer the older bi-polar design; the 5xxx series still sounds great. Meaning it's just my preference and there are very small differences between the two.

H9

[FutureAudio]

Any suggestions for preamp?
What would be the best amp $500 - $700 for lsi15 if adcom 5500 doesnt do a good job? :\

[ben62670]

I like the 545 also. I had a 5400 that didn't sound as good. A bit harsh and overly analytical.
Ben

[FutureAudio]

Dang...I paid abt $350 for 5500 and $125 for 545 ..wish I knew this before :\

[concealer404]

Tell us what you think about the 5200... i wasn't really a fan of that one, either.