[cheeba17]

i have an alpine amp. idr the specs on it right at the moment. but i want a 12" sub that would be loud! i had two tens but want one 12 to save space but i dont want to cut down on the sound. i have a extended cab and i want it to sound good. the plan is to put the sub behind the passenger seat with the amp under the seat. any suggestions? thanx

[d0sitmatr]

your going to lose some sound regardless.
you have to figure 2x10's = roughly 1x20" sub, so your moving almost 8" less air.

[Tys 4x4 FTW]

a single sub setup can sound better then 2. i had 2 12's in a ported box and i now run a single 12 in a sealed box that was recommended for my sub. sounds better then my 12's did.

[d0sitmatr]

true, but that would suggest the 2x12's werent in a box specified for their specs :)
the Amp also plays a huge role here too, if the amp you were using for the 2x12's is the same as your using for the single 12, then you were under powering the dual 12's.
also the type of amp, and how the wiring ran, if they were DVC or SVC subs....
there really are so many variables to consider.
(example:)
current: 2x10's @ 200wRMS/500w peak powered by a 1000w mono block D amp = 20 inches of air movement/response (generalized)

proposed: 1x12" @ 200wRMS/500w peak powered by a 500w mono block D amp = 12" of air movement/response (generalized)

12" air vs 20" air, you tell me which is going to produce more sound ?

to the OP
if possible, you would be better going with a single 15" sub. you can get away with a smaller box, and lose very little sound.

[RLong31]

Depends on specs on amp and subs, how they're wired together, quality of the box, etc. 2 10's and 1 12 inch sub are going to sound different regardless of how you set it up. 1 12 inch sub can be louder than 2 10's, Also, going to sound a bit deeper. It all depends how it's set up. If you do it right, it will sound good. A 15 inch sub is overkill IMHO.

[RLong31]

On another note, what kind of music you listen to? 10 inch subs are a little more crisp and are pretty good if you listen to rock music. The deeper bass of a larger sub is going to sound better with rap/hip-hop/pop etc. Please check the specs of your current amp and get a sub that will go along with it's power rating. Getting a sub that is too powerful for your amp is going to sound like crap if it is underpowered, not to mention you will blow it faster. Working at best buy, I saw most returns and repairs on subs from running subs underpowered, and from people buying crappy subs. Do your research, talk to a good install tech, not the guys on sales floor tryin to get his numbers up.

[cheeba17]

Alpine MRP-M500 Amp: Mono - Car Amplifiers at Onlinecarstereo.com

thats the amp i have.

all this info is very helpful!

[d0sitmatr]

Ryan is also correct in that you should get a slightly deeper bass with a 12", however it all boils down to everything being equalized.
Ive heard perfectly matched 8's that produced the same sound as 12's that were not perfectly matched. on the flipside, Ive heard some 12's that hit so hard its difficult to hear the rest of the music, and not while listening to rap/hip hop, but listening to hard rock.
so yes, the type of music you listen too should point you to the setup.

I use 2x10's because the music I listen too needs hard/deep bass while also needing to be precise when it hits. so 2 10's are a perfect match for my musical tastes.
my neighbor listens to a lot of rap, and he is using 2x15's, which of course can be heard when he is a mile or so away...

that amp is pretty good, so you should be ok going with a single 12" but I still say if you want to stay with close to the same sound go with a single 15"
if its boxed correctly you should see the results your looking for.
Im cheating and getting ready to make a box that will allow me the use of 1 side of my rear seat while still using both my 10's

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