Out of curiosity why does SPL and SQ have to be polar opposites? If you are not straining your speakers in a SQ set up and you add more power, shouldn't you by definition still have the same SQ but with more spl? I agree that for most, adding one or the other does in fact decrease one whether it be the SQ portion or the actual SPL. I listen to rock mostly. Been to over 200 concerts in my day. My car accurately reproduces concert volumes and then some crystal clear. Not trying to start a fight but just curious about the answer. I guess what I am trying to say is that yes if you add megawatts and multi woofers for bass and do not do the same type of upgrades for the rest of the speakers then yeah SPL at the expense of SQ.

I use a TC3000 15" powered by a SAZ 1500D in a ported enclosure tuned to 35 htz. I have 8" mid bass drivers in my doors receiving 250 watts apiece. BG planar mids on axis in the kick panels receiving 150 watts and BG planar tweets on axis in the dash receiving 100 watts apiece. Time alignment Xover and EQing being taken care by an Alpine H701. Gets plenty loud in the mid 140's. Loud enough to pop my trunk seal.

Can it sound like crap? You betcha!! But with the right adjustments it plays beautiful. The Holly Cole trio is amazing at ear bleeding volumes. My boy's rap is just plain rediculous even set up for Holly. Just wanted to describe what I am using so you understand my reference point. A system can be super loud and sound great without fooking with the bass boost or making a fart cannon enclosure.

Hopefully I did not step on toes. God knows a lot of you like M5 have been extrememly helpful to me on my system by answering all of my questions.

cub

Simple answer, we all know that everything is in the enclosure and SPL enclosures are the opposite of SQ enclosures. Specifically one is meant to peak as high as possible and the other is meant to have absolutely no erroneous peaks. Considering this thread was only about subwoofers they are indeed polar opposites.

Sounds to me like loud is the most important though Jim.

The real question is how much space do you actually have??

No. Loud is not the most important. I want good SQ but It has to be louder than what I had. My M-class are quieter than before and I want more.

I dont have alot of space. I have about 16" deep by probably 42" ish wide by about 30 something tall. Thats my whole backseat, well, what was a back seat. My two 10's take up a little over half the width of my seat. I could fit sealed better though. I thought about maybe building a sealed box for my mclass and see the difference in sound.

Amusing since personally I think the M-class drivers sound a bit like fart cannons and you are asking for something louder...

m-class as fart cannons??? with a 200wrms rating?? fart cannon? lol, the m-class is their sq woofer. memphis lineup from entry to highend..

pr

m-class

s-class

m1

m3

mojo

teh s-class is their shallow mount, m1 is a cross breed between the pr,m-class and m3. but the one thing the m-class doesn't sound like is a fart cannon, lol.

wheeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee

As for my definition of smooth is a good non distorted tone over their whole frequency range while still having a well controlled cone when it comes to faster bass drums beats in rock and metal.

A pair of Icon 12's in a ported enclosure tuned around 32Hz would give you way more output and still have the control you are looking for.

As long as you can fit the space. A pair of 10" Icons ported would probably get you close as well.

Thank you for the help and recommendations.

Someone told me that I dont have the amp to push two of them. I think I do. I think pushing around 700-750 rms a peice would be plenty. But do you think it would be too hard on my amp?

a pair of ICON 10s ported (personally, i'd shot for 34-36hz, but i'm a bit of a basshead) off that 1500d will flat out kill waht you have now. it'll sound good, get loud and not strain neither sub, nor amp. (box dependant of course)

wheeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee