subwoofer box size

Home / the12volt's Install Bay / Car Audio / subwoofer box size (

Topic Closed)

Welcome Guest :)

Members

< Prev Topic Next Topic >

monorail

Member - Posts: 22

Joined: December 12, 2005

Location: United States

Posted: January 21, 2006 at 5:50 AM / IP Logged

I've got 2 12" Precision JW12 subs. The recommended sealed box size is 1.75 cubic feet per speaker. My question is what is the absolute minimum box size I can use with batting. I'd like to keep it around 1.5 cubic feet or less, is this feasible?

stevdart

Platinum - Posts: 5,816

This member has made a donation to the12volt.com. Click here for more info.

This member has been recognized as an authority in Mobile Audio and Video. Click here for more info.

This member consistently provides reliable information

Joined: January 24, 2004

Location: Pennsylvania, United States

Posted: January 21, 2006 at 9:58 AM / IP Logged

Is this it? I'm highly skeptical that this is an identical copy of a JL 12W6. I'll be up front about this type of sub (category - brand name knockoff): you don't design boxes for these. You buy a prefab box, put them in it and hope for the best. But otherwise, to be a litlte nicer about this...polyfil stuffing will give you a net increase of air space of 10 to 30%.

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

monorail

Member - Posts: 22

Joined: December 12, 2005

Location: United States

Posted: January 26, 2006 at 7:18 PM / IP Logged

stevdart,

Yes, those are the ones. And yes, they are cheapos. My 16 y/o son bought them online without a clue, so that's what he's getting installed.

I never had any intention of building a box, it's gonna be prefab for sure. I can get a 1.25 cu.ft. per side box for $35 at the flea market. I figure with a little polyfil it'll be close enough. Like you said, hope for the best.

I do have one other question though. They are rated at 450W rms each (6 ohm DVC). If I wire the speakers in parallel and the voice coils in series, do I have 450W or 900W rating if driven by a single channel? The reason I ask is the amp he has (another cheapo) is rated at 720W rms bridged mono into 4 ohms. I know the output will drop into the 6 ohm load, but I want to make sure the speakers won't be overdriven.

If you're interested, the amp is an SPL ST2-1440.

Flame away if you like, and thanks for any replies.

geepherder

Platinum - Posts: 3,668

Joined: October 27, 2003

Posted: January 26, 2006 at 7:22 PM / IP Logged

The power supplied by the amp will be divided by the subwoofers, so you'll be fine.

My ex once told me I have a perfect face for radio.

monorail

Member - Posts: 22

Joined: December 12, 2005

Location: United States

Posted: January 26, 2006 at 7:36 PM / IP Logged

Thanks geepherder! I was hoping that was the case.

stevdart

Platinum - Posts: 5,816

Joined: January 24, 2004

Location: Pennsylvania, United States

Posted: January 26, 2006 at 7:49 PM / IP Logged

I, too, have a son who is a bit older than that now...and I myself have made some very foolish "got to have it now" online buys at one time. So I know where you're coming from. What geepherder said...you won't have to worry about overpowering. In all reality, at least you're dealing with apples-to-apples. There will probably be no more than 200 watts going into each of those subs on a fair day with a strong wind at the back of the amp, and the subs can probably handle that amount of RMS power all day long. But get the gain adjustment right.

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

monorail

Member - Posts: 22

Joined: December 12, 2005

Location: United States

Posted: January 29, 2006 at 5:56 PM / IP Logged

Hey guys, did the install this weekend. No problems and it sounds remarkably better than I had imagined. The subs work fine and the amp is definitely not being overpowered.

Thanks for the help!

Sorry, you can NOT post a reply.
This topic is closed.

Printable version

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot delete your posts in this forum
You cannot edit your posts in this forum
You cannot create polls in this forum
You cannot vote in polls in this forum

Search the12volt.com

Follow the12volt.com

Disclaimer: *All information on this site ( the12volt.com ) is provided "as is" without any warranty of any kind, either expressed or implied, including but not limited to fitness for a particular use. Any user assumes the entire risk as to the accuracy and use of this information. Please verify all wire colors and diagrams before applying any information.

subwoofer box size

Sorry, you can NOT post a reply.This topic is closed.

Sorry, you can NOT post a reply.
This topic is closed.