Some context here: https://www.superbestaudiofriends.o...solid-state-power-amp-adventures.3789/page-29 I picked one of these up for cheap, thinking it would be be Class D based on its light weight. (I'm still looking for a class D amp that I find satisfying). Looks like I could have gotten fooled (explains why I actually thought this thing sounded too damn good for class D?). I realized that only the Crown DriveCore stuff or DSi series are officially stated to be class D. Crown's lineup is extremely confusing. I'm not sure that even their reps can explain. I don't know if the CDi (non DriveCore) is class AB? Crown is very coy about a lot of shit these days. The light weight of the CDi1000 is actually from the switching power supply. The CDi1000 puts out 275W into 8-ohms and 500W into 4-ohms. There would a giant transformer and more heatsinking if an LPS were used. Well, even though it's not class D, at least I'm now beginning to be a believe that SMPS can sound good. Maybe by 2030, I will like class D amplification. (And yes, I've heard the Hypex ncore stuff, including a $10k one - I still think they sounds like ass, insipid - or maybe it's just bad synergy with the speakers I happen like, which tend to have simple xovers and be highly efficient). What I'm trying to figure out are the differences between the CDi1000 and XTi1002. The specs and functionality seem to be same, but the CDi series is twice the price. The CDi does supposedly have better digital goodies (this is 2020 now, so these amps have DSP capabilities such as xover, EQ, delay, protection, etc.), but I have not tried them out yet. The most evident differences are on the back of the chassis where the CDi series, being meant for fixed installation, uses Phoenix and screw terminals for input and speaker outputs. The XTi series, being for portable sound reinforcement, offers XLR inputs and Speakon and binding posts. I do wonder if the XTi from a pure sonics (not DSP functionality) point of view sounds any worse than the CDi. For those who are concerned about the Phoenix 3 terminals, adapters can be found for cheap. We will need the female XLR. https://www.amazon.com/gp/offer-listing/B003D83OWC/ref=dp_olp_0?ie=UTF8&condition=all For my evaluation of the amp thus far, I've switched the DSP off. I'm curious as to how much of a sonic penalty there is with its functions switched on. What makes the Crown CDi series super appealing is that I might be able to build active systems with ease, i.e., without the use of say a MiniDSP and 8-gang pots if I wanted to do something like a crazy four way. By the way, the one fan in the back is actually quiet. Nothing at all like the old school power amps. The fan does appear to speed up when more power is demanded.