My Boston Acoustics are a 1" tweeter, 4", and 6" mid range. I've built fiberglass kick panels for the 1" and 4" drivers and am planning on putting the 6" drivers in the doors. I'm going to be running the passive crossover networks until I go fully active with the MS-8. I'm planning on bi-amping the 6.43.
I figure the only way to fit the IDMAX will be to invert it. I've never had an inverted subwoofer setup. I'm planning on a sealed box behind the seats. With the subwoofer facing backwards, the magnet will be hidden in the center console.
Are there any things special I should consider for an inverted subwoofer setup? Should I wire it out of phase since its facing backwards?
I can't imagine the rear wave being the exact opposite as the front wave from the speaker. I mean, an engineer or whoever designs a subwoofer with the front wave projection as priority #1. So there has to be some give and take with characteristics such as damping. The speaker is designed to dampen the front output, and in the same thoughts, the speaker's suspension is optimized for the front output. All of this means that the rear wave isn't going to be as "true" of an output (for a lack of a better term) as the front wave.
Also, in a sealed box with a natural roll off of 12 db/oct reversing the phase by inverting and then inverting that phase again to align it with my setup. Will this cause some phase/harmonic phase issues? Or am I going in too much detail here?
I'm just not sure how much the speaker cares how it's mounted. I also have an incredibly small amount of space to work with.
Re: I'm looking for information/advice on inverted subwoofer applications.
It should not matter unless the sub makes noises from the back like tinsel slap/etc. You are displacing the same amount of air with the cone movement, so it makes the same bass. There might be a tiny difference but in sub bass ranges in a car its not something anyone will be able to hear typically....the install is going to matter significantly more. You usually start with it out of phase because the speaker is built with polarity to be in phase from the front, a 'normal' or typical mounting. Otherwise the phase issues should not be any different than front facing would have. The motor runs the same way front or back, it has the same force/etc. The negative moves it just like the positive, just like if you put a battery on it momentarily then reverse it you should get the same movement just opposite direction. Your box, the sub, and all that will dictate most of the sound just like any other install.
Pioneer 880PRS~boston comps/alpine coax on Kappa 4 Z~back to Alpine mrd-m500 v12 on pyle 15s IB
Re: I'm looking for information/advice on inverted subwoofer applications.
Cool. Thanks for the replies guys. I didn't think it would really make any difference at all.
Here's my current box that I'm unhappy with.
I built it because I had all the parts laying around. I'm not fond of the sub at all. I recently changed my interior in my truck. I used to have the center seat that flips up for a 3rd person. Now I've got leather power/heated seats and center console.
I was thinking I'd redesign the next subwoofer box a little differently. I could invert the IDMAX into the console.
Now that I've been thinking about it, I'm wondering if I could down fire the IDMAX instead. It could be mounted just behind the center console.
Re: I'm looking for information/advice on inverted subwoofer applications.
I had a few subs inverted and the second time i forgot to phase switch (this amp had no phase knob on it like the last.) So be careful on that.
My impressions of the inverted look is pretty good its nice seeing a nice clean or big magnet and as do on lookers at shows. As far as response it did change, slighly less deep but more loud and this was on the same box and ported but thats just my experiences.
My friend is in a similiar situations and is asking me for opinions and his seats fold up and down but fold low so im interested to see how you handle yours and may steal your idea lol
Re: I'm looking for information/advice on inverted subwoofer applications.
Well, the only reason I thnk I can fit the IDMAX is because I switched to the console setup. Trucks like mine never came with consoles, or heated seats for that matter.
I don't really want to invert to show it off. It's not really my thing. I know other people dig it, and I thnk that's cool. To me, I'd just be asking for trouble. Some how I'd figure out a way to spill a 44oz pop, or throw a burrito in to the driver. LOL!
If I do inverted, the driver will be hidden. This would simply be for air space concerns.
I'll have to do some measuring and see if the IDMAX can fit facing down. I'd rather do that for the protection of the driver.
I have an idea in my head. Imagine that box from above. Except remove the center part where the 10" Pioneer is. Face the driver down. I'd make most of the box out of MDF, and then cover the contours in fiberglass. That way the box could blend into the console.
I'll have to take some pictures to help illustrate what I'm talking about. Give me a few months and I'll experiment with building the box. I just ordered a ton of parts and pieces for the install. I'm holding back on the MS-8 until I get everything up and running. Maybe by then the 360.3 will be out.
Thanks for the help guy's.
Oh, does anyone have any good build threads on regular cab trucks? I've found a few, but not quite what I'm looking for.
I'm looking for information/advice on inverted subwoofer applications.
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