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#144099 - 08/01/06 03:30 PM Re: My Superchunk Bass Trap Project, Graphs included [Re: SirQuack]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13325
Loc: Iowa
I thought I would update the above drawing to give you all a better idea of what the room looks like. Keep in mind this is not to scale.

Since I have completed my Superchunk Traps on the front wall, my next plans are to build some column traps to go in the rear corners.

I would also like to put some bass traps where the walls/ceiling meet in the HT area above where I'm thinking about putting some 1st reflection treatments. Also, I eventually might put some 1st reflection on the ceiling locations.

As you can see, there is a 10" bulk head dropped along the entire width of the room, I might be able to put some smaller bass traps up in the corner facing the screen?

What do you all think?



Also, I have a few questions for using 703 for 1st Reflection Treatments:

1) First of all, am I correct in saying I want to leave some space behind the 703 and the wall, within the frame I build?

2) Also, do I want to use the FRK(scrim) on the side facing the room, or use regular 703 with no facing?

3) For those wall/ceiling treatments do most people use 2" thick or double up and use 4" thick 703?

Thanks in advance, Randy
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#144100 - 08/01/06 09:33 PM Re: My Superchunk Bass Trap Project, Graphs included [Re: SirQuack]
bridgman Offline
axiomite

Registered: 08/25/04
Posts: 5355
Loc: Bowmanville, Ontario, Canada
Take all of the following with a LARGE grain of salt...

>>1) First of all, am I correct in saying I want to leave some space behind the 703 and the wall, within the frame I build?

The space helps with bass trapping but I don't think it helps so much with absorbing higher frequencies. There was a chart somewhere with cutoff frequencies vs. thickness of 703-style fiberglass, will see if I can find it.

>>2) Also, do I want to use the FRK(scrim) on the side facing the room, or use regular 703 with no facing?

If you're talking about paper facing, I think that helps with bass trapping but reflects a lot of higher frequencies. For treating first reflections I would say "no facing".

Note that you probably want a ton of absorbtion (sp) on the left wall to balance off the fact that you have no right wall.

>>3) For those wall/ceiling treatments do most people use 2" thick or double up and use 4" thick 703?

I'm pretty sure 2" is enough for higher frequencies -- the question is whether it's worth putting more FG in there and getting more absorbtion in the lower frequencies.
I'm REALLY tempted to pick up that $150 ETF software package from Rives (also needs mic, cables and decent sound card) which indicates decay & resonances at all frequencies. That would shed a lot of light on what the room needed.


One common treatment for mixdown rooms seems to be what they call a "cloud" over the listening position, basically a big chunk of fluffy fiberglass near the ceiling with enough framing to look half-decent. Not sure if you have enough height to keep it out of the projector light cone though...

BTW I don't think bass traps at the bulkhead would be as effective as bass traps at the back wall/ceiling boundary.

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#144101 - 08/18/06 06:08 PM Re: My Superchunk Bass Trap Project, Graphs included [Re: bridgman]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13325
Loc: Iowa
Well I just got back from getting some more OC 703 Rigid Fiberglass panels and some 1 x 4's. Hope to start building some FRZ's tomorrow, and eventually some more column bass traps for the rear corners. Gotta consider the Wife Factor.
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M22-OWM22-VP100-Denon2805
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#144102 - 08/22/06 12:03 AM Re: My Superchunk Bass Trap Project, Graphs included [Re: SirQuack]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13325
Loc: Iowa
Just a quick update, I've got 3 of my FRZ (first reflection zone) panels built and installed in the correct locations on the side walls. I still need to hang 2-3 on the ceiling FRZ's as well, and then onto a few more bass traps for ceiling/wall corners and then rear column bass traps for the rear corners of the room.

I can't believe how much better the music sounds, just with the front wall superchunks and FRZs up so far. In the mids/high categories the clarity has improved greatly. I am no longer hearing the same sounds that were reflected off walls and coloring the overall sound. Percussion, Strings, etc...just sound crystal clear. My 60's sound better than I ever thought possible.

Ok, don't break out the tissues. I'll try to get some pictures up within the next week. I just wanted to let you know I'm amazed at what I'm hearing with my cd's....

talk to ya later.
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M22-OWM22-VP100-Denon2805
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#144103 - 08/22/06 01:45 AM Re: My Superchunk Bass Trap Project, Graphs included [Re: SirQuack]
HomeDad Offline
connoisseur

Registered: 12/29/05
Posts: 3301
Loc: Central,California
Sounds good Randy, I can't image how good some M80's would sound in your setup
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#144104 - 08/22/06 09:54 AM Re: My Superchunk Bass Trap Project, Graphs included [Re: HomeDad]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13325
Loc: Iowa
My 60's sound better now than 80's with no bass traps or FRZ treatments.
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M22-OWM22-VP100-Denon2805
Audio Nirvana

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#144105 - 08/24/06 10:59 AM Re: My Superchunk Bass Trap Project, Graphs included [Re: SirQuack]
KC23 Offline
local

Registered: 12/03/05
Posts: 212
Loc: Southern California
Great read, thank you for sharing this.

I might of missed it in this thread, but what is your ceiling and floor like? Have you done anything to help reflections/absorptions there?

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#144106 - 08/24/06 11:18 AM Re: My Superchunk Bass Trap Project, Graphs included [Re: KC23]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13325
Loc: Iowa
My current project includes "first reflection" treatments on the side walls and ceiling locations. Then I can move on to finish a few more bass trap locations...
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M22-OWM22-VP100-Denon2805
Audio Nirvana

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#144107 - 08/24/06 04:36 PM Re: My Superchunk Bass Trap Project, Graphs included [Re: SirQuack]
Hutzal Offline
connoisseur

Registered: 07/26/06
Posts: 2102
Loc: Hollywood. (Canadian @ <3)
I am a bit worried about my theatre room. If I order M60's, i have a 16 foot long room. I don't think I'll be able to place the speakers 3 feet from the front wall (1/5 distance) because there is a door to the left of the screen and I don't want people running the risk of kicking the speaker or anything when they come into the door.

Is there a minimum distance of placement from the front wall? Ideally 1 foot for me would be best..

I am kinda freaking out about all this acoustic stuff wondering If I screwed myself over when I designed the room before It was drywalled...


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#144108 - 08/24/06 04:46 PM Re: My Superchunk Bass Trap Project, Graphs included [Re: Hutzal]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13325
Loc: Iowa
My M60's are about 7-8" from my front wall, most people have them closer, 3ft seems to far. I would not worry about the acoustic stuff to much, I didnt' add my treatments until after everything was done either.
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