Help deciding on amp for subs

callandor2k · Post by **callandor2k** » Fri Feb 26, 2010 7:23 pm

Well I remeasured my trunk. If I were to go with a 15" ported. I highly doubt I would be able to even get the box into my trunk once it is built, due to the small trunk opening. There is barely a 14" opening front to back to slide a box into. And I don't want to mount the speaker facing up. So I think I will be restricted to 12" subs unfortunately.

So I was looking at dual 12" subs and porting them.

MB Quart RWE-304

or....

Alpine SWR-1242D - which was where I was at the beginning.

Which would be better? Both are 500w RMS rated and 1000+ max wattage.

callandor2k · Post by **callandor2k** » Fri Feb 26, 2010 8:58 pm

I located RE Audio's L-Ported Enclosure Calculator. With the room I have I can come up with this for dual 12" ported systems. Both subs would have the same box design. Only one would be reversed.

and this one...

Would either of these 2 be any good for the subs mentioned above? I know I don't have much room for ported sub boxes. Because I still want to be able to use some of my trunk if needed.

loudwagon15s · Post by **loudwagon15s** » Fri Feb 26, 2010 9:05 pm

no, port area and size is off, i dont know much about box design, but untill someone else posts, for 2 12's on 500 rms each, i'd say like 3.2 cubes after displacement, 18 sq inches of port per cube, tuned to 30-36 hz.

Bwcad1 · Post by **Bwcad1** » Fri Feb 26, 2010 9:11 pm

No box volumes are way to small and your ports are way to small. From the box you have there you will be best with a single 12 or maybe even a single 10. you dont have room for a 15 and you don't have room for dual anything IMO.

callandor2k · Post by **callandor2k** » Fri Feb 26, 2010 9:16 pm

Ok. I thought that they would be too small as well. Just wanted to see what you all thought.

MobileAudio219 · Post by **MobileAudio219** » Sat Feb 27, 2010 8:59 am

I wouldn't go any smaller than 2.0 cuft (ported) for a 12" type r.

callandor2k · Post by **callandor2k** » Mon Mar 01, 2010 4:26 pm

Ok. I think I figured it out. I think. I can go as high as 16.5" and as wide as 34" and as deep as 16.5" and still be able to get it into the trunk. I'll just have to fold down the rear seats and slide into the trunk. Gotta love 60/40 split folding rear seats with somewhat open access to trunk. With these measurements I can slide it into the trunk and twist it into position. And I will still be able to utilize the trunk.

This is jut an approximation for reference. But you get the Idea.

Btw this would be for the MB Quart RWE-352. As I am not for exact sure on it's tuning frequency spec I just took a rounded guess at ~33. I am no ported expert so numbers may not be exactly what they need to be or should be.

But that is the maximum size for a 15" ported that I can go.

Does that look / sound better than the way I was heading?

P.S.
Oh ya. Being powered by an MB Quart DSC1000.1. Which I got in the mail Friday.

callandor2k · Post by **callandor2k** » Mon Mar 01, 2010 4:54 pm

Or I could go this route....

2.95 cu. ft at 34Hz

Courtesy of another forum. Not sure on policy but I will not discuss name of forum or person posting it.

Bwcad1 · Post by **Bwcad1** » Mon Mar 01, 2010 5:10 pm

Much better. Not the best but it will work.

According to my calculations its tuned slightly lower than 34 but should be fine.

nobody here is against posting his name or what forum its all good.

callandor2k · Post by **callandor2k** » Mon Mar 01, 2010 5:18 pm

Bwcad1 wrote:Much better. Not the best but it will work.

I was hoping you would respond. The first one was just a... rough draft if you will. The second was a free bee on another forum. So I didn't figure it would be one of the best designs but would work.

Do you think you can design a better box using the measurements I provided for my maximum size?