Ok so I haven't posted here...ever...but now I have a new project which is a subwoofer. I have 2 OLD 10"s in seperate cabinets but they are VERY old (like 20 years) and weak (25RMS each) so I am replacing them. I have a Sony STR-DE135 that I got from Best Buy a few years ago, $150. 100watts x 2 and I will guess that is max since Sony likes to BS wattage all the time. The speakers are also Sony's from Best Buy, SS-MB215 to be exact. They are 140watts x 2 max. 1" tweeter, 3" mid, 8" woofer. If you turn these up letting them do all the bass distortion becomes apparent, which is the reason I had "subs" because they didn't distort so easy and really helped the low frequencies. This is all for my computer, which is used for music, games and maybe one day movies but mostly music. The mobo is soundstorm certified, so there is not a problem there... But my birthday (18th) is coming up and I was going to improve my audio....now I have a few questions... I was reccomended the Dayton Series 2 sub...8ohms... And there is only about 2 different sub amps, so I gotta go with the PE 250watt remote controlled one... But it seems the amp puts out more power at 4 ohms, and at 8ohms it isn't even close to the sub's potential so I decided to look at the Dayton Quatro...a "Series 2" that is 4ohms... It does 4ohms, so it's much closer to the sub's RMS and it would seem a good match, and apparently it is "improved" over the Series 2...but it's cheaper...so I dunno... I am looking to have a new sub under 350...that or completely new speakers all together if these Sony's suck all that much...if I can still get good bass... Thanks.