Have there been any signifigant changes in the last 20 years in amps I should be concerned with?
I'm looking at a re-capped and maintainenced older amp (Adcom 555 II) vs a newer similar amp (Emotiva XPA-2). Ignoring the obvious differences (XLR inputs, power differences, warranty), can anyone point out why I would want to avoid one or the other?
Yes, there have been improvements in SNR and low-level distortion, probably due to better ICs in the initial driver stages, and discrete component manufacturing has improved over the past 20 years too. Are these improvements audible? Maybe, depending on your speakers, the quality of your source components, and your ears.
I'm not a fan of the XPA-2, based on Gene's 1W measurements. The XPA-2 is a lot of power for the money, but cleaner power is available. The question is, what is your budget?
You might consider one of the Crown XLS2500s that some folks here rave about. The price is certainly right, but I haven't heard them personally. Some of us also like the ATI AT2000/3000 series, but they cost more and weigh more.
How much is the re-capped Adcom?