Thinking of downsizing

I wouldnt exactly consider going from 1.5 cubes to 2 cubes as downsizing.

What's the point? SQ isn't dictated by subwoofer size. My current 21 can play as a midbass if you wanted it to and my last 15 before that could be used as a midrange (srs). Both can also play well below 20hz in the right box and do both at the same time lol. Your not going to gain SQ by dropping woofer size, you'll actually be adding more distortion, all things equal. What do you REALLY want out of your setup that your not getting now, then I can help answer your real question properly. As it is right now, your trying to switch from a truck to a car, because you want to go "faster". It doesn't always work like that...

My 10s play just a low as any other sub. I actually had them playing down to 23 hertz a while back so saying they won't play low is definately not true You just won't get as much from a 10 as apposed to a 12 or 15. Because of cone size

so if I were to go with a 10" XFL, I'd be able to hammer the lows and still keep the same amount of output?

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What exactly is wrong with your current setup that you would want to change?

Going from 1.5 cubes to 2 cubes is not downsizing.

My treo ssi 10" played 22hz till a tinsel tore

2.0 is a bit big for a single 10 xfl. Should keep it to 1.25-1.5

35hz is a bit high of tuning if 30hz and below is your main target, depending on the car this could be expected. You could try a slightly larger box and drop tuning some. 1.75 at 30hz would increase your 30hz performance by a good bit. Going to a smaller sub size isn't going to give you a huge change, you have enough room to do a larger box with a 12, I'd stick with that.

Keep the 12. Bigger box. Lower tuning.

Get this http://www.caraudio.com/forums/subwoofer-classifieds/568316-tc-sounds-lms-r-2-a.html