or Connect
AVS › AVS Forum › Audio › DIY Speakers and Subs › Evaluating the room and (distributed) subwoofer options
New Posts  All Forums:Forum Nav:

Evaluating the room and (distributed) subwoofer options

post #1 of 6
Thread Starter 
I'm hoping to achieve two things with this thread;

(1) Determine what alignment to go with (IB, sealed, folded horn etc)
(2) Devise a plan to measure optimal locations for said alignment, as they will most likely be built in.

However, maybe I need to measure the room before we can talk alignments, but anyway....

Below is a floor plan of the dedicated HT room. Ceiling height is 8.5 ft, giving a total volume of around 5300 ft^3. My mains have an f3 of 80hz (I think) so that's where I'll have to cross to the subs.

I have around $2K to spend on drivers and building materials. I'll be using my current amps, approx 5K watts and a Behringer DCX will be performing processor duties.

My first though was three or four IB manifolds (2x18 or 4x15 each) around the floor. Possible locations are green areas on the floor plan. The location near the sink would be on the wall however.

Another option would be a bank of horn subs in the cupboard (7x2x8.5 ft of vacant space) with an additional sub located in the garage* below the HT with the mouth firing up.

A sealed array could also work, but I think that might clutter the room and quickly go over budget. However a sealed sub or two could further smooth out an IB's response?

Anyway I think the IB will be the clear winner due to ULF and around 120db (above 20hz) of output but I'm opened to suggestions.

As for determining optimal locations, I was planning on buying a sealed 15" sub kit from parts express along with some measuring gear and see what kind of response the various locations give me. Does this sound like the correct approach?

BTW I'm also planning on DIYing some acoustic treatments, but the rear two corners of the room are taken up with the sink and fireplace, so I'm going to be relying on a distributed sub solution to smooth the response. The room treatments will be more for mid bass and above.

* The garage is below the HT room, but offset such that the pink area depicted in the floor plan is solid ground. In other words any sub located in the garage will have to be a minimum of 7ft from the back wall of the HT room.
LL
post #2 of 6
Will this be a dedicated room? Where do you want to place the screen?

To get you started, download http://www.pvconsultants.com/audio/reflection/rrc.htm It only does two sources but, by playing with it enough, you can get an idea of what you need to do. Rather than the 15" PE, you might get 4 smaller "throw away" subs to test placement options. Put them on Craigslist when you're done.
post #3 of 6
Thread Starter 
Quote:
Originally Posted by pnw View Post

Will this be a dedicated room? Where do you want to place the screen?

To get you started, download http://www.pvconsultants.com/audio/reflection/rrc.htm It only does two sources but, by playing with it enough, you can get an idea of what you need to do. Rather than the 15" PE, you might get 4 smaller "throw away" subs to test placement options. Put them on Craigslist when you're done.

Thanks for the link Paul, that calculator looks pretty cool. I'll download it and have a play around.

The screen is going to be up against the front of the room where the five windows are and it's more or less a dedicated room - I'll edit my pic to make that clear, thanks for picking up on that.

IIRC PE has some nice little 10" subs that could work for your suggestion, but isn't it possible to place a single sub at the listening position and measure various locations around the room and then sum the results?
post #4 of 6
Doesn't necessarily work that way. Play with the spreadsheet for a while and you'll see some interesting results.
post #5 of 6
Thread Starter 
Thanks Paul, will do.
post #6 of 6
Thread Starter 
These look like they fit the bill for a cheap driver for testing as per Paul's suggestion. $14 for a 10", not bad. I think I'll do four 2x10 boxes and that should give me enough swept volume to include them in the final build (to smooth out the FR), if they sound good enough. If they're sub par, then I can always use them else where.

Has anyone ever complemented their IB with sealed subs?

http://www.parts-express.com/pe/psho...number=299-106
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: DIY Speakers and Subs
AVS › AVS Forum › Audio › DIY Speakers and Subs › Evaluating the room and (distributed) subwoofer options