Help Needed Power Amp lacks punch

In case you didn't know it, you have a Mosfet amp. As a general rule, most Mosfet amps have less "slam" or "impact" than a well designed Bipolar unit. Mind you, not all Mosfet amps are "weak" on bass output, but they do tend to sound softer and more rounded. Part of this is why people say that they tend to sound "more tube-like" than Bipolar's along with a few other reasons.

If you haven't already been doing so, leave the amp powered up 24/7 for a couple of days. I've found that this tends to even out their tonal balance much better / faster than powering them up and using them as needed. If the amp hasn't been run in a long period of time, 48 - 72 hours of continuous power will get you most of the way there. After that, the unit will be pretty much as good as it gets within about two weeks or so. Mind you, these are just my sonic observations, so take them for what they are worth. Sean
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I put an Adcom 555 to shame in my system. My little McIntosh dished it out way more readily in the bass despite the Adcom's big power rating. Maybe you need a different amp? You could be having mismatch issues too which are compromising it. Arthur

I've found that the power cord can make quite a difference on big, mid-fi and above amplifiers. No experience with an Adcom specifically, though.

After doing some research I found the 555mkII had the most slam and for some reason the newer adcoms lacked a little.I don't know if they started doing something different but thats what I found.Good luck

Could be electric power issues. Is your AC power clean? Are you still using a standard OEM power cord? Don't plug the amp into a power strip; put it right into the wall.