Can a new amplifier affect speaker placement?

I'd give it some time to settle -- more than anything, in your own mind. Get used to the sound, and why it's different. (That is, unless you're looking at a return window in which you need to make decisions, but even then, give it as much as you can). When you say that the bass isn't as rich, what do you mean. Leaner, less boomy, tighter, faster, less extension, less textured, less energy...? Some of these things can be good thing, some of them less so. Could be that the amp is simply less capable of controlling your woofers. Could be that it is more capable, and that what you're hearing less of is actually a product of better control and more accuracy. Could be that, whichever it is, it really doesn't matter because you prefer the sound of the Creek. So, sure, can happen -- any of those things. Could also be that moving your speakers will give you better (or worse) results. I'd experiment with all that. And put in some time with the new one -- as much as you can or have patience for -- then switch back. I've always found that switch back to be the most enlightening moment regarding whether the change was worth it. Just my two cents.

+1 Mezmo.

Both amps are overachievers in their price category.
Sturgl
03-07-13

Yes, all amps in specific, and equipment in general, are overacheivers in their price category. LOL! I'm sorry, but that just sounds like sales-speak to me. A component's performance and price are not directly linked.

Don't buy the hype, listen with your own ears, and let them be the judge. If the NAD is brand new, give it some time to burn in, but just because it cost more does not mean it will be better than your old amp.

Absolutely yes, it can.

Each amp change I have made in recent years has required changes in speaker placement for best results. The biggest was moving to current Class D amps from prior Class A. That produced a startling change in soundstage, imaging and dynamics that required subsequent tweaks to get tuned back in.

The issue might be related to the nature of amp. The NAD is a digital amp, which I believe is called a class "D". The Creek is a hi-current type, probably "AB". From what I've been reading digital amps can be a bit thin sounding. Some of the positive points about "D" types are little to no heat and low electric consumption. The NAD might not be the best amp for you at this time. NAD makes more convention designed amps that are well reguarded too. You might want to look into one of those if you're looking exclusively for that brand - good luck.