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post #1 of 11 Old 11-30-2019, 07:11 PM - Thread Starter
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What DIY sub to use in my home Threatre

Hi guys just after some of your wise wisdom.

I'm about to start the construction of my home Threatre room (20L x 14W x 9H). I have engaged a designer and he has suggested to use 2 custom sealed 18inch Seaton sound subwoofer. Now the problem is that the subwoofers he has suggested with the amplifier plus shipping is 8KUSD which is hurting the budget too much. I'm sure they are fantastic but just can't justify the cost right now.

Sooo I'm here trying to find a more cost effective alternative. One of the main reasons the Seaton sound was suggested is that it is only 12inchs deep, which allows for a better seating position from the screen.

I've been looking at DIY subwoofers and there are so many to choose from! Which is amazing, but difficult to choose. I was initially going to use the "marty" design but I'm not sure if I can build it so it's only 12 Inches deep. I appreciate any ideas or feedback you guys can give.

Oh I should mention that I'm in Australia so sadly makes it hard for me to demo DIY gear without actually building it.
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post #2 of 11 Old 11-30-2019, 08:47 PM
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I'd see if you could modify the VBSS design to be only 12" deep. You could put 4 behind your screen and probably run all 4 from a single Behringer NX3000D and be around $1,100.00 USD.

7.4.4 Theater Room: JVC-RS500, Silver Ticket AT 2.35:1 142”, Onkyo RZ830, Anthem PVA-7, Panasonic DBT-110, JBL Studio 530’s, 4 - 15" DIY Sealed Subs

3.1 Living Room: Samsung 64” F8500 Plasma, Anthem MRX 300, Dynaudio Audience 52’s, Dynaudio Audience 122C, NHT SubOne
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post #3 of 11 Old 11-30-2019, 08:49 PM
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How many rows of seating are you trying to accommodate? 20 feet is a good length room, mine’s about that and I have two rows of four reclining theater seats and have two mini Marty’s in front and two in back. Is there something specific causing the space constraint?

SPEAKERS: 3 x DIYSG 1099's LCR; DIYSG HTM 6's and 8's surround; 4 x RSL C34E's atmos.
SUBS: 4 x UM18-22 Mini Marty's and 2 x 21DS114-4 Devastators
SIGNAL CHAIN: Denon X4400; Minidsp 2x4 HD; 2 x Jensen Iso Sub 2RX; 3 x NX6000d.
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post #4 of 11 Old 11-30-2019, 11:45 PM - Thread Starter
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Quote:
Originally Posted by Mocs123 View Post
I'd see if you could modify the VBSS design to be only 12" deep. You could put 4 behind your screen and probably run all 4 from a single Behringer NX3000D and be around $1,100.00 USD.
Yeah I was thinking something along this line, I like your thought of 4 instead of 2 as well 😂

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How many rows of seating are you trying to accommodate? 20 feet is a good length room, mine’️s about that and I have two rows of four reclining theater seats and have two mini Marty’️s in front and two in back. Is there something specific causing the space constraint?
Just two rows of seating. The main reason is to maintain a set seating space from the screen/speakers so that the angles between the speakers is keep at a minimum of 45 degrees (I think it was this angle) and that I'm not too close to the screen.

It's all about the right distances and angles from speakers, this is what my designer told me and I want to try my best to stick to his design.

I do like the marty design, perhaps this can be made slimmer but taller?
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post #5 of 11 Old 12-01-2019, 07:19 AM
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Quote:
Originally Posted by Nicolas Sole View Post
Yeah I was thinking something along this line, I like your thought of 4 instead of 2 as well 😂



Just two rows of seating. The main reason is to maintain a set seating space from the screen/speakers so that the angles between the speakers is keep at a minimum of 45 degrees (I think it was this angle) and that I'm not too close to the screen.

It's all about the right distances and angles from speakers, this is what my designer told me and I want to try my best to stick to his design.

I do like the marty design, perhaps this can be made slimmer but taller?
I get angular parameters for speakers, but applying them to subs is a new one on me. However, I also get “buy in” and understand sticking to advice you pay for and trust. I don’t think you’ll find “standard” diy designs that fit your criteria. You could, however, design custom cabinets around your available drivers and design them to be very shallow. Some examples:

https://www.avsforum.com/forum/155-d...ld-thread.html

https://www.avsforum.com/forum/155-d...questions.html

https://www.avsforum.com/forum/155-d...you-ltd02.html

Most common inexpensive drivers used around here are probably the pa460 and the um18-22. Most common inexpensive amps are probably the nx3000d or nx6000d. Several of the pro 21” drivers are also very popular, and are a few hundred dollars more expensive. Whatever you choose will be many thousands of dollars cheaper than your current option.

SPEAKERS: 3 x DIYSG 1099's LCR; DIYSG HTM 6's and 8's surround; 4 x RSL C34E's atmos.
SUBS: 4 x UM18-22 Mini Marty's and 2 x 21DS114-4 Devastators
SIGNAL CHAIN: Denon X4400; Minidsp 2x4 HD; 2 x Jensen Iso Sub 2RX; 3 x NX6000d.
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post #6 of 11 Old 12-01-2019, 07:38 AM
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Not a very good designer if he/she can only accommodate a 12" deep subwoofer, IMHO. Since construction hasn't started, it's much cheaper to make changes on paper than drywall. Also IMO, he/she should revise the design for free, since he/she never sought your approval about the subwoofers required. Show him/her the HT build thread, and count the builds that used 12" deep subs.

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post #7 of 11 Old 12-01-2019, 03:06 PM
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Thre um18-22 is on sale for about 20% off.
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post #8 of 11 Old 12-02-2019, 07:00 PM - Thread Starter
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Quote:
Originally Posted by lawdogx View Post
I get angular parameters for speakers, but applying them to subs is a new one on me. However, I also get “buy in” and understand sticking to advice you pay for and trust. I don’t think you’ll find “standard” diy designs that fit your criteria. You could, however, design custom cabinets around your available drivers and design them to be very shallow. Some examples:

https://www.avsforum.com/forum/155-d...ld-thread.html

https://www.avsforum.com/forum/155-d...questions.html

https://www.avsforum.com/forum/155-d...you-ltd02.html

Most common inexpensive drivers used around here are probably the pa460 and the um18-22. Most common inexpensive amps are probably the nx3000d or nx6000d. Several of the pro 21” drivers are also very popular, and are a few hundred dollars more expensive. Whatever you choose will be many thousands of dollars cheaper than your current option.
awesome thanks heaps for that!!! very helpful.

I particularly love the last thread you posted the tall and skinny martys. will definitely consider them! Yeah ill probably use the um18-22 seem like a very popular option with a nx6000d.
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post #9 of 11 Old 12-03-2019, 11:40 AM
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Depends on the room but if you can create a false wall that has about 20-24" of depth behind it you can really shove alot behind it. I think mine is 17" and I was able to fit 8 12's (could fit more still) behind it in 16 cu ft of boxes. But really you could go more shallow it just depends on how deep your mains are, then you also want a little gap between your AT screen and the speaker as well.

Thats how Id do it, actually, thats the only way id do it. Makes DIY easier too since you dont see anything you build lol.

- 6 BA CR6 array center channel, QSC AD-S82 L/R, 4 jbl 8330a surr , 8 jbl 12" subs w/Inuke 6000. JVC rs420, Denon x4000, Sony x800 -
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post #10 of 11 Old 12-03-2019, 11:45 AM
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18" behind the screen really opens up the options quite a bit. I have 25" inches behind my screen for subs and speakers.

7.4.4 Theater Room: JVC-RS500, Silver Ticket AT 2.35:1 142”, Onkyo RZ830, Anthem PVA-7, Panasonic DBT-110, JBL Studio 530’s, 4 - 15" DIY Sealed Subs

3.1 Living Room: Samsung 64” F8500 Plasma, Anthem MRX 300, Dynaudio Audience 52’s, Dynaudio Audience 122C, NHT SubOne
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post #11 of 11 Old 12-03-2019, 12:57 PM
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^
the "thin" cyclops may be a candidate

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