[jg968]

I came up with a fairly simple design for a cubby sub that uses a small section of sono tube cut at an angle to minimize standing waves and a flat panel. It is designed to fit snugly into the rear passenger side cubby. I've made 2 so far, one for each of the two 968s in our family. We love them. The difference in the overall sound quality is amazing.

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[rxter]

Looks great. Both cars coupes?

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[jg968]

Yes, two blue coupes. Eric's is Maritime blue with classic grey/light grey (egebhard on this forum). Mine is Cobalt blue with black/light grey. Not that we wouldn't mind having a cab. Just have never found a nice one, in you guessed it - blue.

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[rxter]

There've been a lot of discussions regarding subwoofers. The cubby in the coupe has been used to good effect by others as well. I think someone was selling a kit at one point. Your design and installation looks nice and I am sure rounds out the sound in the coupe.



Cabs are a whole different animal and we have all struggled to get the right mix of mid and low bass, especially with the top down. Mine sounds great in the garage, sounds pretty good in the driveway, so-so on the access road, and like crap on the freeway. Oh well the price we pay for al fresco motoring.

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[jg968]

Yes, that's a difficult sound problem to solve. I agree, just enjoy the open air and get some great in-the-ear buds....

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[DaveN]

I have a sub in both my S2 and 968 in the right rear well. Nice of Porsche to put thoses there <img src="/forum/images/smilies/968/smile.png" class="smilie" alt="" /> I built a 3/4" plate to fit the top of the opening and just filled it with Hollowfill. They are only 8" subs to the best I can hope to do is fill in the bottom a little without taxing the 6.5's in the rear.

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[Byte]

I like your install. Nice. Here's something I found before, but I like your design better. Looks more "finished".

http://www.klaindustries.net/subwoofer/subwoofer-1.htm

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[tamathumper]

I bolted one of these right to the wood that covers the DME in the passenger footwell, then re-attached the rug over it. That position was nice and close to the battery for the dedicated power line. I mounted the little gain adjustment knob out of sight on the left wall of the glovebox, but it puts out so much bass I can't turn it all the way up so I just leave it at about half-mast.

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[flash]

what is the air volume? what driver are you using?

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[DaveN]

I routed my wires out the back and under the carpet so you don't see them unlike the KLA.

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[jg968]

I used a Dayton RSS210HF-4 8". The enclosure is approximately 0.5 cu ft sealed and filled with acoustic-stuff.

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[JWahlsten]

Define acoustic stuff.... I'd like to get a little more bass filled in as well. What are you driving it with?

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[jg968]

JWahlsten - Acoustic Stuff is a sound absorbing material I buy from PartExpress.com. It looks like cotton fill, but is some other kind of fiber. It's also where I bought the 8" driver. I'm driving it with a Kenwood KAC-6104D, a 200W x 1 at 4ohm amp - picked it because it was the smallest 200W amp available from Crutchfield. It is mounted in my glove compartment. I added some rear holes for venting and wires to the glove box. I did that because I didn't want to run a bunch of wires to the back. With the amp in the glove compartment, I just had to run the speaker wire to the back. That was relatively easy to hide.

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[flash]

hmmmm - .5 cu ft??? are you sure about that?



i ask because it sure looks a lot smaller than that. based on the tube being 8", it would have to be over 17" long to be .5 cu ft. that sure looks a LOT shorter than that.



to reach the 27hz that driver is capable of, it needs 1.14 cu ft.



what i see there in the pic looks like about 10" of tube. that would be about .275 cu ft. that would limit the low frequency support to about 70hz. below that it would just waffle about.



interesting idea, and i'm sure it's better than without anything at all, but i think it needs to be bigger to really work well.

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[JWahlsten]

Thanks, jg968.



I can use the bass...

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[jg968]

Flash - Yes, it's not .5 cu ft by measured dimensions. But I'm sure you're aware you can increase the effective volume with acoustic stuffing. It's more like .3 or .4. And because it's sealed, the speaker is not going to "waffle about". But you're right, it is probably in the 60-70 Hz F3 range. Sure sounds a lot better than the stock speaker config though. I'll do some testing and let you know what frequencies are produced and at what level. I'm really curious.

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[flash]

yeah - hard to tell from the pic how long it is or what the actual diameter is. i was guessing based on the driver size, and came up with about .3 cu ft



i'm quite sure it sounds better than the stock speakers. i can't believe how wimpy the OEM installation is. the drivers aren't bad, and with a bit of a mod can sound actually quite good, albeit limited on power capacity, but the installation just plain sucks.



the "waffle" reference was the best i could come up with to describe what happens when a box is too small for the frequency being sent to the driver. the speaker gets "stuck" in between cycles attempting to move in response, and "waffles" as a result. i didn't mean to say that it was just flopping around.

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[bombfactory]

Anyone know what the volume and freq. response is for the KLA box? Should I fill it with any 'foamy stuff' once I buy one and get it installed?

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[flash]

volume is about .25 cu ft as i remember. the best i could get out of it with the punch driver (which only responded down to 40 or something to begin with) was 65hz.

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[bombfactory]

Thanks Flash. Guess 65hz is better than nothing.



Finally figured out my dead left front channel. It was two issues: loose connection in the door and a bad neg terminal on the amp. Fixed the connection and hooked channel 1 neg speaker wire up to channel 2 neg terminal and all is good.

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