B

Bass Head

Audiophyte
Hello,

New to the forum and really wanting some opinions on the best way to set up the new "boom room" as I have nick named it. It is actually part of my man cave that is under construction. The room is as of now completely open, I am thinking about getting rid of the pool table and making a huge TV room, also know as a boom room, because of my speakers and setup I am currently using. As you can see from the pic, it is a blank canvas.



As of right now it being open was really hard to get bass response we wanted, and have tried a ton of different scenarios to get the level of bass we wanted from the home theater setup. I guess I should start by listing what equipment we are running. We use a "Central Head Unit" as we call it to do all the processing of the channels of surround, which basically means we are running one receiver that controls other amps and receivers to be able to adjust volumes of every channel of the surround in a different aspect. We are currently running a NAD T 763 which we love for the preouts on every channel, we have amps for every channel, as a whole running seperate amps and receivers for each channel in the following pics.


Now as I am sure that most of you have already noticed, we are running 2 car audio amps in our setup, this is because they are really cheaper than home audio, and you can push a ton more power. To be honest 99% of our setup is car audio, all mids and highs are Audio pipe as well as the subs.



So basically to break things down we are using mids and highs, that are car audio Audio Pipe in Cerwin Vega MX400 cabinets, heres the kicker though, each speaker is wired differently from a different amp. basically the mids have their own amp. the highs (tweeters) have their own amp, and the subs have their own amp, all in the same cabinet, which is the same for the mids and highs, also Audio Pipe, as surround channels, which are simular to the center channel listed in the picture above.

No we get down to the lows (no pun intended) lol. The lows have been troubling for us because of the size of the room itself. Now the MX 400 cabinets were used soley because of their response with the speakers and high "punchy" bass, they are accurate and sound really good with freq. that are higher, however they lacked in low bass, anything below ill say 40 hz. This is where we decided to make a "bass module" that grew to be the sum of 4 Audio Pipe 15 s. This box is huge and designed for these subs to give off a low bass tone that would shake anything around it. The box is tuned at 28 HZ, (which I think is the best freq. for these subs to be tuned at, as you can see in the pictures we first tried a sealed box, which we were not at all happy with. Now we started this bass module just out in the open, which a room this size, it was hard to get the bass response we wanted, after many many trials, it dawned on me, (my thoughts here) "If I had a mini van, parked up here, with 4 15s in it, it would make bass that was more omni directional to fill the room." Which sparked the idea of a Bass Closet. What does this mean, I basically googled the air space of a mini van, but this into a speaker calculator and determined how big my closet would have to be to reproduce the same effect, we even took it a step further, as to tune that closet to 30 HZ, as an entry way, set the box in it and tested. We were amazed in part at the way the SPL would fill the room using this type of setup.


Now that we have all the testing done, my idea is simply this, to take a section of the huge area, and create a TV room, that will incorporate the boom closet, in the very front of the room, with my TV setup directly in front of it



Now this room will be specially designed, what I was thinking is to start by framing the walls out on 8 inch centers. I have my boom closet on 8 inch centers now, we started on 16 s and there was too much vibration, the walls of the boom closet are 3/4 MDF, with drywall on the other side. Lesson learned, I am going to frame out the new boom chamber with 8 inch centers, with a front firing port into the TV room, as I said directly behind the TV set up. The TV room itself is going to be set on 8 inch centers, with all walls, not drywall but 3/4 MDF, both in and out, with as much insulation as I can stuff into them.

So I guess my question is, do you think that the 3/4 MDF in and out will be too much, do you think that this will greatly increase the spl, by firing the boom closet into a smaller room? To break down system specs

(5) Audio Pipe ATR-4421 Titanium Tweeters
(5) Audio Pipe APSL-6 Low Mid Freq Loudspeakers
(6) Audio Pile TS-PC15 Subwoofers
7,500 watt car audio amps on the subs
Mixture of smaller amps on the surround speakers

Any thoughts or suggestions would be greatly appreciated

Thank you
 

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JohnnieB

JohnnieB

Senior Audioholic
Hey basshead.
Have you considered an infinite baffle?
 
JohnnieB

JohnnieB

Senior Audioholic
Well from what I gather from the photos, you're putting an enclosure inside an enclosure. Not sure how this sounds better. o_O
With an infinite baffle, your front and back sides of the driver are completely separated from each other, like a sealed enclosure, except your room is the enclosure.
Here's a link to an infinite baffle setup.
http://www.avsforum.com/forum/155-diy-speakers-subs/1432588-7-x-re-audio-xxx-18-subs-infinite-baffle-sub-ultimate-ib-build.html
This particular example is a bit extreme. There are plenty of threads on this forum on infinite baffle subs. Just figured since you were building enclosures, this might be a better way to go.
 

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