Home theater subwoofer advice

For livingroom sound better than in a theatre.
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billkatz
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Home theater subwoofer advice

#1 Post by billkatz » Sun Jun 11, 2017 10:20 pm

My tablesaw has been sitting idle for too long, and while my DR250/T39 system doesn't get used much, it doesn't really fit by my television. The room my TV is in is about 15' x 15', but has little wall space, owing to the many doors and windows.

A couple quick pictures:
First, looking at the TV. The space between the door and outside window is all I have to work with:
tv_credenza.jpg
Looking at the TV, sitting on a credenza, with cheap Costco speakers
I think a pair of floor-standing TLAHs on wither side of the credenza might work, with a curved SLA under the TV.

And the couch on the other side of the room (currently flanked by the O15TB my son uses for electric bass, one set of DR250/T39:
couch_bookcase.jpg
Looking back at the movie watching couch
I have three ideas for subwoofers:

1) Table Tube built as a coffee table in the middle of the room
2) Table Tuba long style on the floor behind the couch (the recliners built into the couch require it be spaced away from teh wall anyway)
3) THTLP, built as narrow as possible for a 12, also on the floor behind the couch.

I don't really have a wall at either end of the "behind the couch" space to fire the sub against, and I can't block the closet door (to the right of the T39). Perhaps I could slide the bookcase to teh other side of the couch and point the sub at teh left corner near the sliding glass door.

Any suggestions/advice?
Built:
1 Omni-15 Tall Boy
2 DR250s
2 Titan 39s

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LelandCrooks
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Re: Home theater subwoofer advice

#2 Post by LelandCrooks » Mon Jun 12, 2017 10:37 am

TT long behind the couch makes the most sense. Recline it first though and measure to make sure the cab won't interfere.
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DJPhatman
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Re: Home theater subwoofer advice

#3 Post by DJPhatman » Mon Jun 12, 2017 2:49 pm

LelandCrooks wrote:TT long behind the couch makes the most sense. Recline it first though and measure to make sure the cab won't interfere.
I'd build a "platform" for the couch using THTLP. Do you have any of that flooring left, or at least available?

Also, how important is the "credenza"? Could it be "rebuilt" into a sub pretending to be a credenza?

Skip the floor-standing TLAH, and put them on the wall. No precious floor-space is lost. Curved SLA under the TV should be fine. Have you given any thought about surrounds?
I know money often seals the deal, but seriously, quality is an investment, not an expense... Grant Bunter
Accept the fact that airtight and well-braced are more important than pretty on the inside. Bill Fitzmaurice

billkatz
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Re: Home theater subwoofer advice

#4 Post by billkatz » Mon Jun 12, 2017 11:55 pm

LelandCrooks wrote:TT long behind the couch makes the most sense. Recline it first though and measure to make sure the cab won't interfere.
I just measured with the seat reclined, and 15" x 18" will fit just fine. Thanks!
Built:
1 Omni-15 Tall Boy
2 DR250s
2 Titan 39s

billkatz
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Re: Home theater subwoofer advice

#5 Post by billkatz » Tue Jun 13, 2017 12:07 am

DJPhatman wrote:
LelandCrooks wrote:TT long behind the couch makes the most sense. Recline it first though and measure to make sure the cab won't interfere.
I'd build a "platform" for the couch using THTLP. Do you have any of that flooring left, or at least available?

Also, how important is the "credenza"? Could it be "rebuilt" into a sub pretending to be a credenza?

Skip the floor-standing TLAH, and put them on the wall. No precious floor-space is lost. Curved SLA under the TV should be fine. Have you given any thought about surrounds?
Raising the couch seems like a lot of work...

The wall is only 7' wide, and I have just 41" above the light switch, so I might have to go with the 8 speaker version and trim and inch or so off of it to fit it over the switch. Would I want the rectangular version given the close spacing? It seems too close for the triangular versions.

For surrounds I'm planning on building the 2 woofer version of the SLA from the recent plans intended for surrounds. I actually planned for this, and have outlet boxes in the ceiling at the two back corners of the room with wire in the wall back to where the TV is.
Built:
1 Omni-15 Tall Boy
2 DR250s
2 Titan 39s

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DJPhatman
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Re: Home theater subwoofer advice

#6 Post by DJPhatman » Tue Jun 13, 2017 7:56 pm

billkatz wrote:Raising the couch seems like a lot of work...
Doing things the right way, the first time, saves you work/time. TT behind the couch is fine. Build a second to fit under the credenza.
billkatz wrote:The wall is only 7' wide, and I have just 41" above the light switch, so I might have to go with the 8 speaker version and trim and inch or so off of it to fit it over the switch. Would I want the rectangular version given the close spacing? It seems too close for the triangular versions.
Check out Bill's:
Image

You have plenty of space! Worse case scenario is you take out most of the toe-in.
billkatz wrote:For surrounds I'm planning on building the 2 woofer version of the SLA from the recent plans intended for surrounds. I actually planned for this, and have outlet boxes in the ceiling at the two back corners of the room with wire in the wall back to where the TV is.
Smart!

About the credenza: see authorized builder Scott Brochu"s "hidden" center and sub in this post.
I know money often seals the deal, but seriously, quality is an investment, not an expense... Grant Bunter
Accept the fact that airtight and well-braced are more important than pretty on the inside. Bill Fitzmaurice

billkatz
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Re: Home theater subwoofer advice

#7 Post by billkatz » Sat Jun 17, 2017 4:55 pm

DJPhatman wrote:
billkatz wrote:The wall is only 7' wide, and I have just 41" above the light switch, so I might have to go with the 8 speaker version and trim and inch or so off of it to fit it over the switch. Would I want the rectangular version given the close spacing? It seems too close for the triangular versions.
Check out Bill's:
Image

You have plenty of space! Worse case scenario is you take out most of the toe-in.
I could hang rectangular TLAHs on either side of the TV. I can't really get anything in the left corner as to the left of the door you see are two more doors that make up the laundry closet.
DJPhatman wrote:
billkatz wrote:For surrounds I'm planning on building the 2 woofer version of the SLA from the recent plans intended for surrounds. I actually planned for this, and have outlet boxes in the ceiling at the two back corners of the room with wire in the wall back to where the TV is.
Smart!

About the credenza: see authorized builder Scott Brochu"s "hidden" center and sub in this post.
I've seen that - beautiful cabinet work. I don't think my finish cabinetry skills are up to that level. If the TT behind the couch is insufficient, I can always add another as a coffee table. I may yet see if I can squeeze a THTLP behind the couch - the 12" version minimum size is 15" x 18".

On a related topic - is it OK to use hardwood for the face of TLAHs instead of Baltic Birch to give a better finish? I see it mentioned in the SLA plans, but not the TLAH plans.
Built:
1 Omni-15 Tall Boy
2 DR250s
2 Titan 39s

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Bill Fitzmaurice
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Re: Home theater subwoofer advice

#8 Post by Bill Fitzmaurice » Sat Jun 17, 2017 5:00 pm

Never use hardwood wider than nominal 1x8. It's expansion characteristic is very different from plywood or MDF, so broken joints will likely occur at some point.

Jeffrey16
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Re: Home theater subwoofer advice

#9 Post by Jeffrey16 » Mon Jun 19, 2017 9:24 am

Hi Bill,

With your set up, did having your tv below your right channel speaker affect imaging or have any negative effects? Thanks

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Bill Fitzmaurice
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Re: Home theater subwoofer advice

#10 Post by Bill Fitzmaurice » Mon Jun 19, 2017 9:55 am

Jeffrey16 wrote: did having your tv below your right channel speaker affect imaging or have any negative effects?
Not at all. In the contest between visual directional cues and audio directional cues visual wins every time. It's the other way around with most animals, dogs for instance.

billkatz
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Re: Home theater subwoofer advice

#11 Post by billkatz » Mon Mar 12, 2018 7:57 pm

Well it only took 9 months to actually get started, but the Russian Birch is in the shop and the table saw is humming. I plan on buying kits from Speaker hardware for the TLAHs and curved SLA using the recommended Goldwood drivers. I have a couple quick questions:

1) The curved SLA on teh product page shows the mid-basses front mounted and the tweeters rear mounted, but the TLAH shows both front mounted - is there a preference?

2) Using the recommended drivers, what size hole saw do I need for the 4" Goldwoods? What size drill for the tweeters?
Built:
1 Omni-15 Tall Boy
2 DR250s
2 Titan 39s

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Bill Fitzmaurice
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Re: Home theater subwoofer advice

#12 Post by Bill Fitzmaurice » Mon Mar 12, 2018 8:49 pm

My TLAH are oak veneer plywood, so rear mounting would leave the plies visible. The center baffles are solid oak, so I rear mounted those.

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Re: Home theater subwoofer advice

#13 Post by billkatz » Tue Apr 24, 2018 8:29 pm

I need advice on my next decision: What driver to use in the TTLS?
There's almost a 4:1 variation in prices among the 4 drivers recommended in the plans from the low of the MCM to the high of the Tang-Band, with the 8" and 10" Daytons in the middle. When I was building the DR250s, I knew that springing for the neo drivers would pay back every time I lifted them on the stands, and the 3012LF gave me more headroom in the T39s.

I'm building it at 17" wide (using 16" panels) as that is 1/3rd of a 4' x 8' plywood sheet, and gave me optimum sheet usage.

I'm not averse to spending money when there is an advantage, but I hear that only a few volts into any of these drivers will make my room shake. Any advice?

(I am starting with a single TTLS behind the couch. Compared to the anemic unit that came with the Sony receiver, I'm sure it will be great.)
Built:
1 Omni-15 Tall Boy
2 DR250s
2 Titan 39s

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