Custom build, humor me and discuss

[annunaki]

Well I just measured mine and there is only 2" under it haha... BUT..the bottom of the couch has just a thin wrapping that you can press in and see that its hollow beneith. I think this is just to make the couch look finished. I didn't take a knife to it (yet) to see how much room is actually under there... but I bet there is some real room. Just pushing I get like 5 or 6".

I think this project is neatest if we designed something that only fit under most couches and didn't use anything behing. Because, lots of people have their couch sitting in the middle of the room so behind wouldn't work for hiding it. If there is room behind and its just up against a wall, then lots of stuff could be fit back there, even my giant. In that case, basically what I call a "truck box design" would work, like the car audio guys build for regular cab pickup trucks that fit the profile of the seat versus the rear firewall.

I bet under most of our couches is a lot ton of dead space. I think the design would require a low profile driver to work for most people. So far we have a Tang Bang and a Diamond, and I just found this on JL's website:

http://mobile.jlaudio.com/products_subs.php?series_id=30

3-ohm, just as a note.

Thsi thread has me thinking of a project of my own now

 

[MidnightSensi]

Haha, me too.

I just mapped out a pair of JL Audio shallow mounts in a vented box tuned to 22Hz at 8-cubic feet. and they will do almost 116dB flat to the tuning frequency without overexcursion. Feeding the pair 500-watts. The problem is at 8cf, the box is too big for most people.

I then tried a single JL, with a 4cf box, which still might be a bit big.. and at 225-watts the output is only 109dB to the tuning frequency.

Could run more power with a limiter, but, I've blown so many subwoofers I'm not a big fan of having to limit excursion above the tuning frequency.

 

[MidnightSensi]

Holy expensive driver batman

http://www.shopatron.com/product/part_number=92181/1451.0

I'm out on the shallow mount JL. 570 bucks, wtf.

See it as low as 350 or so on google shopper, but, that would be without warranty.

 

[Nemo128]

I was hoping this would start up some good discussion.

MidnightSensi, you're right, the length of my listening room is roughly 22 ft front to back and 16 ft left to right. However, my speaker-defined listening environment is, let's say, the top right corner of that top-down view with dimensions 10 ft front to back and 8 ft left to right. The couch is at the point 10ft from the front wall. If you can picture that, you see what I'm up against.

annunaki, what do you think about those Tang Bang subs? If I can get it through one of my contacts, that low-pro JL might be an option too.

The woman (architect) is working on a floor plan and 3D model now of stuff, so I can put some real perspective on it for whoever wants to help.

 

[MidnightSensi]

I was hoping this would start up some good discussion.

MidnightSensi, you're right, the length of my listening room is roughly 22 ft front to back and 16 ft left to right. However, my speaker-defined listening environment is, let's say, the top right corner of that top-down view with dimensions 10 ft front to back and 8 ft left to right. The couch is at the point 10ft from the front wall. If you can picture that, you see what I'm up against.

annunaki, what do you think about those Tang Bang subs? If I can get it through one of my contacts, that low-pro JL might be an option too.

The woman (architect) is working on a floor plan and 3D model now of stuff, so I can put some real perspective on it for whoever wants to help.

Post up the 3d model for sure, did you measure how much room you have under your couch? We need to allow for excursion of the subwoofer too.

 

[Nemo128]

Woman wants to start working on the model tonight. She's quick though, and I bought her a freagin Quadro so she better get it done quick if she knows what's good for her!!!!

Now just gotta make sure she never sees this post...

 

[MidnightSensi]

a 5600?!?!?!

 

[lsiberian]

Post up the 3d model for sure, did you measure how much room you have under your couch? We need to allow for excursion of the subwoofer too.

We wouldn't want him to pop up out of the seat.

Or feel something that should never be experienced.

 

[Nemo128]

We wouldn't want him to pop up out of the seat.

Or feel something that should never be experienced.

LOL! I'd probably like both.

Sensi, a 3450. I got it for her when she was doing her MArch about 2 years ago. She hasn't earned the 5800 yet, but let's see how quickly she gets my model done...

 

[MidnightSensi]

Been home sick today so been looking at drivers for my next little project...

Ran upon this Diamond Audio d3 driver, fairly inexpensive and a 4.1-in mounting depth. I like the DA stuff, but, its coincidental that I recommended two in one thread. I've never used a d3 before, but I've been searching for some 8s for something else so this came to mind.

http://www.diamondaudio.com/content/view/132/146/

 

[Nemo128]

I've used D3s in cars. Very clean and pretty efficient. Diamond isn't exactly cheap though. Still, might be more cost effective than JL. But I do get some discounts on JL, not on Diamond...

Still working on putting that floor plan together. I'll take dimensions tonight or tomorrow of the space under the couch.

 

[Nemo128]

WAF is high on that PartsXpress DYI project. Something like that, I can do it right now.

Environment specs to come!

 

[Nemo128]

Measurements!!!!

Ok, these are the available dimensions under the couch:

61" Length x 24" Depth x 6" Height

I want to make note of the height. It is 6" from the floor to the lowest point on the bottom of the couch. The front actually has a height of 6.5", but the back gets to 6". Obviously you guys would want some space between the sub and the couch, so 6" is to the very bottom of the couch without any air space.

I will follow up with some listening environment specifics as soon as possible.

I hope to get some good feedback. Project is green light with the woman and I can do as I want.

 

[annunaki]

Allowing .5" for clearance & isolation, there would be approximately 3.1 ft^3 gross volume before bracing, woofer & vent displacement. Is there anyway to tell if you can get more height under specific areas of the sofa? If so, how much?

3.1ft^3 gross volume is not much area all things considered, especially for a vented application.

Ok, these are the available dimensions under the couch:

61" Length x 24" Depth x 6" Height

I want to make note of the height. It is 6" from the floor to the lowest point on the bottom of the couch. The front actually has a height of 6.5", but the back gets to 6". Obviously you guys would want some space between the sub and the couch, so 6" is to the very bottom of the couch without any air space.

I will follow up with some listening environment specifics as soon as possible.

I hope to get some good feedback. Project is green light with the woman and I can do as I want.

 

[Nemo128]

I think that's pretty much what I can use. Wouldn't that be closer to 4ft^3?

I might be able to open up the bottom of the couch and claim more space, but it wouldn't be all usable. There's bracing under there, it'd need to be an odd shape.

If the woman gets this floor plan done soon, you can see what I'm working with.

I'm seriously considering the low-pro JL subs. Looks very interesting indeed...

 

[annunaki]

You have to subtract 1.5 inches from each of the three axes due to the enclosure thickness. That is how I ended up at 3.1ft^3 gross internal volume.

I am looking at using a Tang Band driver for my friend's in-wall application. 1.25ft^3 vented tuned to 22hz or so. Output is not real high, but I am looking at using 4 of them potentially. The problem is that the vent displaces a lot of air as it is quite long with such a small vented application.

I will keep my eyes open for you though.

 

[Nemo128]

That sounds good, seems similar to that DYI on PE.

Can you tune it even lower with that size of enclosure?

I'm looking at $500-600 total to spend.

 

[annunaki]

That sounds good, seems similar to that DYI on PE.

Can you tune it even lower with that size of enclosure?

I'm looking at $500-600 total to spend.

Tuning lower is not an option due to an excessive spike in response near the tuning frequency. An 80hz x-over with a 2nd order slope would be required as well. One could go higher in frequency if needed.

 

[Nemo128]

Sounds good. Let me know how that comes out. I may mimick your build.

What do you think the quality of the bass would be with this? Man, I so want to do this. I've already started looking for that BASH amp and getting the wood ripped since I don't have a table saw handy...

 

[Nemo128]

I was modeling a bunch of subs with my limited knowledge in WinISD.

The Pioneer TS-SW2541D looks very interesting indeed.