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Discussion Starter · #1 ·
Pictures to come but Im going with two rows instead of the single row I have now. Im also finally moving my screen off the side wall and using the proper full length of my room.


Im building new speakers at this time too (but Im always building speakers) so nothing big to talk about there. Im finally adding two 30 amp circuits too (still 110V) this will give me more then enough votage to drive my 4000Watts amps to clipping during movie peaks. I have several large amps Im testing out with my two LMS5400 subwoofers.



One thing I want to discuss is the riser for the second row. I think I measured that it should be about 9" tall.


When I build the platform I will still be adding my buttkickers to it but I have been thinking about stuffing it with rockwool, OC703 or ultratouch cotton to stablize and help with too much vibration. Will this alsos help my bass response in room??? I already have corner tri traps and I will be adding 4" think OC703 (with 2" air gap) behind/beside my main speakers and screen.
 

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Quote:
Originally Posted by penngray /forum/post/20809997


One thing I want to discuss is the riser for the second row. I think I measured that it should be about 9" tall.

Depends on a couple of factors...this might help:
Riser Height Calculator


Quote:
When I build the platform I will still be adding my buttkickers to it but I have been thinking about stuffing it with rockwool, OC703 or ultratouch cotton to stabilize and help with too much vibration. Will this also help my bass response in room??? I already have corner tri traps and I will be adding 4" think OC703 (with 2" air gap) behind/beside my main speakers and screen.

Some guys will build their riser to reinforce certain low frequencies, like a Helmholtz Resonator . I believe this takes a pretty good deal of tweaking though, since you'd have to design the riser based around the sound of the room and what frequencies your looking for.


If you're just trying to stop the riser from vibrating, I'd skip the expensive insulation and just stuff it with fluffy fiberglass.


Feel free to keep us posted on your speaker builds as well, we like a bit o' speaker pr0n ourselves over here in the Dedicated HT side of AVS.
 

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Quote:
Originally Posted by penngray /forum/post/20809997


When I build the platform I will still be adding my buttkickers to it but I have been thinking about stuffing it with rockwool, OC703 or ultratouch cotton to stablize and help with too much vibration. Will this alsos help my bass response in room???

It could, if you leave some openings for sound to get in and hit the insulation - how many and where - well, I've never found a good explanation for how to determine that. I just filled mine with pink fluffy, and closed it up - since I have quite a bit of bass trapping elsewhere in the room (superchunks in four corners, and insulation filled soffits (bottoms open except for fabric).
 

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Discussion Starter · #4 ·

Quote:
Originally Posted by HDvids4all /forum/post/20810321


Depends on a couple of factors...this might help:
Riser Height Calculator





Some guys will build their riser to reinforce certain low frequencies, like a Helmholtz Resonator . I believe this takes a pretty good deal of tweaking though, since you'd have to design the riser based around the sound of the room and what frequencies your looking for.


If you're just trying to stop the riser from vibrating, I'd skip the expensive insulation and just stuff it with fluffy fiberglass.


Feel free to keep us posted on your speaker builds as well, we like a bit o' speaker pr0n ourselves over here in the Dedicated HT side of AVS.

I definitely want to utilize the riser as a low frequency bass trap so I will be buying the higher density fibreglass or ultratouch cotton since I'm not a big fan of handling fibreglass (who is
). I atleast want to measure the differences in my room with and without it.


All my speaker builds are in the DIY Forum on this site. My current build has stepped up my DIY efforts to pretty much the "unlimited" $$ level of DIY and I would compare my latest build to ending up with similar performance found in the JBL K2s. My TAD CDs cost $1400 each alone.


Here is the thread.....
http://www.avsforum.com/avs-vb/showthread.php?t=1345765
 

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Discussion Starter · #5 ·

Quote:
Originally Posted by Brad Horstkotte /forum/post/20810637


It could, if you leave some openings for sound to get in and hit the insulation - how many and where - well, I've never found a good explanation for how to determine that. I just filled mine with pink fluffy, and closed it up - since I have quite a bit of bass trapping elsewhere in the room (superchunks in four corners, and insulation filled soffits (bottoms open except for fabric).

I was going to leave the platform open on the sides, just covering it with GOM fabric.


Im trying to figure out if I should leave a 3" air space gap between the OC703 and the original floor?? That will give me 6" of OC703 and 3" air space which if I remember correctly is a pretty good low frequency absorption choice.
 

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Quote:
Originally Posted by penngray /forum/post/20812639


I definitely want to utilize the riser as a low frequency bass trap so I will be buying the higher density fiberglass or ultratouch cotton since I'm not a big fan of handling fiberglass (who is
). I at least want to measure the differences in my room with and without it.

I hear ya on the fiberglass, I ponied up for the SafeTouch insulation in my walls just so I wouldn't have to deal with the "itchiness" factor, drives me crazy.


For bass trapping in the riser, mtbdudex has a pretty good thread about building his, including measurements on how it affected the room. Some pretty good links inside that thread with other information as well.
 

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Discussion Starter · #7 ·
When I did the first built I used a combination of Rockwool, OC703 and Ultratouch compressed cotton to findout what I liked the best. I think I will be using the "ultratouch cotton" for this project.



Thank you for the link.
 
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