I calculated my actual box to be 0.31cf, but the dimensions I have posted up top could possibly be 0.32cf (not much difference). I accidentally deleted my original design, so the dimensions you see posted up are from a combination of memory and rough measurements of the finished product. After seeing the box mounted I see some dimensions that can be expanded (like frontwards into the front passenger foot area, and extra 2" is possible). I was pretty happy to be able to get 0.3cf though as that seems like a pretty standard volume for smallish woofers.

 

You're right. I calc'd wrong. 0.309cf.

You're right about the versatility of a box this size. Another 2" out the front would simply add to that.

Well, if my design doesn't work, I'll always have this design to fall back on. Thanks again.

 

Great design! Thanks for sharing! I was thinking doing the same thing as well! Now I can save much time and just make it base on your template. Have you try to seat on it? Does it vibrates the seat much? The reason I ask is that my wife will be the passenger most of the time when I drive.

 

Thanks! I haven't sat on that seat much but my girlfriend says you can feel certain notes better than others. It's not like a massage chair, but there's a little something there. Good luck if you decide to do it.

edited:
Alright, I was listening to music on the way home and kept reaching over to feel the bottom of the passenger seat. It vibrates! It does it more with "808" style bass http://en.wikipedia.org/wiki/Roland_TR-808 but will do it with some normal bass lines with non-synthesized bass. With rock music the most dominant bass is usually from the kick drum. Overall it hits with enough oomph to shake mirrors and give out some nice clean bass.

When I got home I hopped on the passenger seat. My weight alone damped most of the vibration you can feel when the seat is empty - things like long extended bass notes. Punchy percussive bass (kick drum) will still punch through to be felt by the passenger. In my opninon I don't think it's annoying or distracting at all to the passenger.

 

Hey Rock, thanks for the tips! I think I will have to install a little switch on the amp's remote wire so that I can switch off the sub when my wife is riding, then turn it back on when I am driving alone, I think that's only solution since my wife is very picky, she will be annoyed by the vibration.

How about the bass sounds? I was told that sub does not sound good if it is under the seat since there is not enough air for it in that tight space. Does your bass fill up the cabin pretty good? I know that you said it sounds pretty good, just want to know the details.

Thanks! You are the man!

 

A switch could work, but a **** would be even better. I have one from my old car that wires in line with your RCA cables. It acts just like a volume ****. I haven't installed it yet, but it's going to be nice to be able to adjust the sub volume. It sounds like your wife might be annoyed with any sub so some sort of switch/**** sounds in order.

The sound doesn't hit as hard as when it's in the rear hatch area but it does sound more even throughout the cabin as opposed to being boomy in the back seat. I know there isn't much clearance for the woofer, but it sounds good. It doesn't sound 'choked' at all. Notes bloom just fine.

Of course, YMMV. Good luck!

...and by the way, nice rims! I always liked the AR1 and it's nice to see them on an xB2.

 

**** sounds like a good idea, I think RF actually makes one for my amp and I can just plug it in, may be I should get one.

I don't really like so much boom but want to have some deep accurate bass. I guess that's what I am looking for.

Thanks to your shared information, I have made the enclosure myself based on your template. (Although it took me 4 hours...) It is not really easy to make because of its shape, but certainly "do-able". The box is basically finished, just need to furnish it with carpet. I will post the pic once I finished it.

"YMMV" ???

Thanks man! I always like "mesh" style rims... especially AR1 looks like two-piece BBS.... hahaha.

 

I hope the box works out for you. Did you cut the floor vent and relocate the sensor that hangs down from the seat? If you need tips on that it's in one of the other under-seat subwoofer threads. Please post pics and your impressions. Exactly which sub do you have? Is it the P1 or P2? Although I have the eD 9kv.2 and it's great I'd love to hear the Image Dynamics ID8. I've always been a fan of ID products.

Anyway, I'm really curious to hear your impressions...

...and YMMV = "your mileage may vary" as in, "you may experience different results.

 

just use the sub controls on your H/U..... when my wife dont want to hear good bass fill, I reach for the H/U.. bring up the sub menu. turn it off!!!! no switch..... you already got it built in......... jh

 

That's true I forgot about that. After trying it both ways I prefer to use a remote **** rather than going through the menus on the HU. If only you could program shortcuts on the HU...

Im my current case, there is no subwoofer lever control on the Scion Nav System. For now it's a flashlight and a screwdriver (for fiddling with the gain control). But dyxb, you should look into jh's suggestion as well. It's the cheapest way.

 

I'm the one that purchased the old pioneer sub/enclosure from 'beef. I've been idle on these forums for a while, but wanted to chime in that I was able to fit it under the driver's seat with the only modification being removing the grill from the box. The plastic vent under the seat is blocked, but it did not have to be cut, simply 'pushed' forward.

I did have to remove (not fully, just unbolt) the driver's seat to get it to fit perfectly. Unfortunately I didn't take any pictures. I may try to get some at some point, even though they'll be tough to understand/visualize with the seat fully in place.

This sub suits my neads almost perfectly. If I want more bass I may just add another pioneer box under the passenger's seat, although that's where my amp (Alpine PDX 4.100) resides.

--falz

 

That's awesome. I'm glad to see it put that Pioneer to good use and that you're enjoying it. I always thought it sounded pretty good. Good point also that you can simply push the vent forward. I noticed that there is a lot of play, but I didn't know you could push it all the way in. The new eD enclosure I have now slides right under the seat if you slip it in through the back with the seat moved forward. I wish I had your amp!

 

Many thanks to RocktheBeef and others in this and the Underseat v1.0 thread. Y'all have got some great ideas cooking!

What you had in the Pioneer Premier slim 9" and the amp pushing it sounds exactly what I would like - something to fill out the low end but not enough to rattle fillings and body panels. I took the dimensions from the box above and lopped off the lowest 1" joint, making the bottom 11.25" long and 5.5" high on the back, and 2.75 on the front. I'm going to cut the side panels the same and inset that bottom panel by the 1", giving the box "legs" from front to back and allow it to sit on top of the floor vent and make kind of a channel for the vent.

I recalc'ed the interior volume at .26cf, still well within the specs for the Premier 8".

I'm pretty handy with a table saw and drywall screws, so i'm going to build it myself. One question, though: what's the nominal thickness of the carpet on the box? I found some black outdoor mat at Home Depot that's 1/4" thick. Will that work? I may have to score it to make the corners as sharp as I'd like.

Once again, thanks guys!

Edit: Would The Pioneer GM-3300T, Continuous Power Bridged (4 ohm) 150W x 1, be a good amp to pair with that sub?

http://www.pioneerelectronics.com/PU...GM-3300T?tab=A

 

I think that sub would be very happy in the box you're building. I think the amp you posted is pretty ideal. I was considering that same model at one point. As far as the carpet goes it sounds like the stuff you picked up is too thick. The carpet that most boxes have is fairly thin and won't need any scoring. If you can't find any maybe you can buy a few yards from your local Best Buy or Circuit City from their car audio department.

 

Thanks for the tips. I haven't got any carpet yet. I was just pricing at Home Depot. Crutchfield wants $30 for a roll, so I'll take your suggestion and run with it. HD's MDF is only $9 a sheet, and I love a good workshop project. Thanks again!

 

Really nice setup for a sub.

Help me understand....can I drive one with the standard HU?
Is there sub-out wiring or drive it from the rear speakers to an amp?

What's a good source for the sub and an amp?
Can you spec components for me, I'm dumb

I just did a stereo setup on my boat last year and it turned out awesome, so a little more bass is in order for the new xB.

BTW, first post, just got the rig, 500 miles on it. LOVE IT!

Scionlife is great!

Thanks!!

 

None of the Scion head units will power a sub, and the standard doesn't have rca pre-outs. You'll have to go with a line out converter or choose an amp with speaker level inputs.

As for a good source, i'd shy away from the big box retailers. Too many horror stories out there. I've heard good things about Crutchfield.com. Personally, the almighty dollar rules, and I'll probably end up on eBay for the stuff I'm getting. If you're not picky about what you want, you can find systems all day long on Craigslist.

Good luck!

 

Sorry guys, I built the box last week but didn't get the time to complete my installation (plus Wife's b-day coming up and ..... dada.da....) WIll post pic and impression later.

 

do u think to pioneer slim 10" would fit?

it looks close....

 

I couldn't find the mounting specs for that woofer. The biggest hole you can put in my design is 10.5". My guess is that it would fit, but you'd have to double check. The 3" mounting depth might not clear the shallow parts of the box that stick out.

One note is that the 10" slim Pioneer has an xmax of 6mm where the eD 9kv.2 has an xmax of 14.1mm. If you do the math (pi*r^2*xmax) the pioneer will move 18.56 cu in of air in its biggest stroke and the 9kv.2 will move 27.91 cu in in its biggest stroke. The 9kv.2 is no joke. The Pioneer is more efficient though... But the 9kv.2 can move more air than lots of 10s out there whereas the slim pioneer moves less air than most 10s out there. I don't think it's even a close comparison. The Pioneer probably costs more too.

btw, I did this quickly and I know Pioneer has several models to choose from. I don't even know which one I took the specs from, but it was one of their slim 10s.