Kinda hard to say because I don't know what certain frequencies are in certain songs, but I think they should be able to play the mid to upper 40's with no problems. I determined the frequency the drop off happens by playing test tones. As far as clean and loud and the definitions of them....The clean part was more me asking if the AQ puts out clean power...people are always using the term "clean power" and I was just wanting to know if the AQ qualifies as an amp that puts out clean power. Loud....what's loud is very much subjective, I get it, I guess I was just wondering if the DD 2512's would fall under the "loud" category if pushed with the AQ2200 in a properly built enclosure. I'm not looking for a meter monster or nothing like that, I just want a daily driver that has a bangin' sub stage with a clean sounding front stage. My equipment prospects are my own choices, nobody led me to either of them...I have an AQ1200 that I am happy with, it didn't cost very much and pushed my subs nicely which is why I considered the AQ2200. As for the subs, I just wanted to go with something not many others out here have. Your problem lies in the fact that you currently have SQ subs in a box that isn't geared towards your music listening style. It may be what ID recommended, but that recommendation was either based on information you relayed to them wrong or done blindly. I personally wouldn't buy an AQ amp. Has nothing to do with being clean and even still it is your subs, I pretty much bet you couldn't hear "dirty" even if dirty were 10% THD in your subs. Amazing how crappy ears are in hearing low frequency info. If you want a budget amp continue on the path, but I would personally either spend more on the amp or buy used. I also haven't ever heard a DD setup that I would consider adequate. Nothing to do with loud as that is no problem, but coming from the ID's you are going to be disappointed in the frequency response as what you have now will be way more musical. IMO if your fronts are truly clean it'd be a shame to dirty the whole setup that way.