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?
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%.
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Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
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.
The power supplied by the amp will be divided by the subwoofers, so you'll be fine.
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My ex once told me I have a perfect face for radio.
Thanks geepherder! I was hoping that was the case.
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.
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Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
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!