i'm over "vs threads" as much as the next guy but...

[BoomBoxStereo 10+ year member]

i'm really having trouble deciding between 2 12" Obsidian D4's or 1 SA 15. i haven't really gotten any help or advice in which people would prefer, so i'm hoping this thread will clear it up. i never ran a 15 before, but i have run 12s so i'd like to hear peoples opinions before i go spending money!

thanks everyone!

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[4OZGLOVES 10+ year member]

Going to have a cone area advantage with the 12's. they would likely be louder.

 

[BoomBoxStereo 10+ year member]

Going to have a cone area advantage with the 12's. they would likely be louder.

i'm also looking for lows that'll shake me inside lol, will i be able to achieve that with the obsidians?

 

[hispls 5,000+ posts]

How much space are you willing to sacrifice to a box?

 

[BoomBoxStereo 10+ year member]

How much space are you willing to sacrifice to a box?

i'll be using one of these two boxes if it is for the 12's:

http://www.caraudio.com/forums/miscellaneous-car-audio-classifieds/560065-sale-enclosures-two-12s.html

if it's a 15, my dimensions are 16" deep at narrowest point, 40" wide, and 22" high to the top of the rear seat (not including the headrests)

 

[BrownVanMan 10+ year member]

how much power ya got is a good conciderations too. the 2 OA would need about 1500 watts but the sa 15 6 to 800

 

[Kangaroux 5,000+ posts]

how much power ya got is a good conciderations too. the 2 OA would need about 1500 watts but the sa 15 6 to 800

Those obsidians are very efficient and will get loud off little power, they don't need a lot to do their thing.

OP I've used the OA's and they are probably some of best bang for your buck subs on the market right now.

 

[BoomBoxStereo 10+ year member]

how much power ya got is a good conciderations too. the 2 OA would need about 1500 watts but the sa 15 6 to 800

my Diamond Audio D1000 @ 1 ohm giving me 1100 watts

 

[itsblown 10+ year member]

go to the 2 12s it will be louder. Ive ran both 2 12s and 1 15 for the 1 15 to be louder it needs to be on a lot more power and a way better of a sub. The oa and the sa are pretty similar.

 

[skylineTT 10+ year member]

Agree with the obsidians. They'll do fine on 1100 watts.

 

[pro-rabbit 5,000+ posts]

i'll be using one of these two boxes if it is for the 12's:
http://www.caraudio.com/forums/miscellaneous-car-audio-classifieds/560065-sale-enclosures-two-12s.html

if it's a 15, my dimensions are 16" deep at narrowest point, 40" wide, and 22" high to the top of the rear seat (not including the headrests)

The 12s will likely net the best result. However, the enclosures you have won't allow them to. You will need a new enclosure no matter what you purchase.

 

[-BenBen- 10+ year member]

I went from 1 15 fi btl tuned to 29 hz, to 2 12 american bass xfls tuned to 33hz, and the 15 got louder on the same power. i will be adding more soon tho and a new box. my 12s are in a 3.75 cu box after disp. and soon ill be going to a 5 cu box. the btl was in a 4 cu box and was a side port . xfls have a 8 inch aero port

 

[wickedwitt 10+ year member]

go to the 2 12s it will be louder. Ive ran both 2 12s and 1 15 for the 1 15 to be louder it needs to be on a lot more power and a way better of a sub. The oa and the sa are pretty similar.

This.

If you can make a proper box, the 2 12s should win all day/every day in every way. Louder, lower with authority, and longer lasting due to having 2x the VC to spread the heat caused by power.

I went from 1 15 fi btl tuned to 29 hz, to 2 12 american bass xfls tuned to 33hz, and the 15 got louder on the same power. i will be adding more soon tho and a new box. my 12s are in a 3.75 cu box after disp. and soon ill be going to a 5 cu box. the btl was in a 4 cu box and was a side port . xfls have a 8 inch aero port

I bet the 12s end up on top in the new box.

 

[hispls 5,000+ posts]

i'll be using one of these two boxes if it is for the 12's:
http://www.caraudio.com/forums/miscellaneous-car-audio-classifieds/560065-sale-enclosures-two-12s.html

if it's a 15, my dimensions are 16" deep at narrowest point, 40" wide, and 22" high to the top of the rear seat (not including the headrests)

OK, so plenty of space. You should expect similar performance (provided you have a good box) out of either with an edge on power handling and impedance options if you get a pair of 12's.