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Post by bradd on Apr 24, 2019 10:00:21 GMT -6
I second Eric's recommendation that you call Jeff Hedback. He is very reasonable, and handles all of that pesky math that I can't do. He will also keep you from wasting a lot of time trying things that may not work. I mean, I don’t have a big budget or anything. Wonder if he does just consulting? Jeff does consulting and is very reasonable (like a few hundred dollars). You will need to do a SketchUp plan, which is a bit tedious, but Jeff is the way to go.
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Post by mrholmes on Apr 24, 2019 10:51:51 GMT -6
IMO you cant do anything wrong with massive broadband absorption in home recording special in small sapces.... Its cheap efffective, goes low down into the base range and works in a lot of cases. Best of it all its easy to do.
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b0b0
Full Member
Posts: 39
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Post by b0b0 on Apr 24, 2019 11:07:54 GMT -6
I recently had to tackle a 93hz mode in my room. An acoustician friend of mine advised I build a "diaphragmatic absorber". It's 4x6ft "box" essentially. 2x2 frame with 3/8 plywood on the front and back. The interior is filled with rockwool. I wrapped the exterior with fabric and hung it BEHIND my speakers/desk.
Super easy to build, and was surprisingly effective at correcting the issue at 93hz.
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Post by svart on Apr 24, 2019 12:23:48 GMT -6
How about just bump your frequencies around 100 when mixing? Add a sub? Move the sub? When I run my sub, I just turn it up until the music sounds like I LIKE it and I mix like that. I then compare translation and adjust it up or down a little to get it translating right.
it probably sounds crazy boomy to someone else though.
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Post by jcgriggs on Apr 24, 2019 12:25:26 GMT -6
A problem at 100Hz in a room that small is very likely modal, so knocking down reflections is unlikely to help. Treatment in corners is key to dealing with modes but at some point it comes down to room geometry and there are some low end issues of this type where any other fix becomes about as expensive as changing the geometry. That being said, 100 Hz is not really low for a mode (which extend into sub-sonics even in medium-sized rooms), so you may have luck damping it. Also, if this is a space with fixed source and listening positions, you can try moving either or both - modes tend to cause "hot" (or "cold") spots, so you may be able to find a spot where the source does not excite the mode or where the ringing mode is not heard. For spaces where the source(s) and pick-up(s) move, you can learn where the trouble spots are and avoid them (or use them as desired)
My $0.02 (Canadian Tire), John
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Post by Johnkenn on Apr 24, 2019 14:08:37 GMT -6
Holy shit Google Sketchup is the most confusing app I've ever tried to use.
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ericn
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Balance Engineer
Posts: 14,967
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Post by ericn on Apr 24, 2019 14:45:36 GMT -6
Holy shit Google Sketchup is the most confusing app I've ever tried to use. Most find it easy I who have used many CAD programs am in complete agreement with you !
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Post by LesC on Apr 24, 2019 16:05:16 GMT -6
Jeff and I are not in agreement on everything, I’m a speaker guy he’s a room guy, Jeff convinced BradD to buy this gigantic single sub. I said smaller stereo subs, these days Brad seams to agree I was probably right ( besides if I had been wrong 2 smaller subs could have been used as a large mono sub. Still for audiophiles, recording, or just about any space I get asked about the first words out of my mouth are “ call Headback “, yet to hear somebody say it wasn’t worth it. I've got stereo subs (SVS SB-2000's) to use with my Focal Shape 50's. I'm in a small room (12' x 14' x 8' high) with the speakers along the 12' wall. I've got it set up so I can run the Focals alone full-range, or switch to running the Focals high-passed and the subs low-passed. I like what the subs are doing, pretty well under the speakers, but I haven't done a lot of experimentation with room placement. Do you have any general tips? I'm down to one day job only in May and June, the closest I get to a vacation, so I'll have some time to do measurements, I just got the Sonarworks measurement mic that I plan to use with REW.
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Post by LesC on Apr 24, 2019 16:10:12 GMT -6
I recently had to tackle a 93hz mode in my room. An acoustician friend of mine advised I build a "diaphragmatic absorber". It's 4x6ft "box" essentially. 2x2 frame with 3/8 plywood on the front and back. The interior is filled with rockwool. I wrapped the exterior with fabric and hung it BEHIND my speakers/desk. Super easy to build, and was surprisingly effective at correcting the issue at 93hz. That's interesting! Unless I'm misunderstanding, a 2 x 2 frame would allow 1.5 inches of rockwool. And that affected a 93hz mode? Is that because of the plywood front and back?
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Post by jampa on Apr 24, 2019 16:31:56 GMT -6
Just donated to site
I had a setup in an a-frame once. Speakers set up along a sloped wall. Had a bass problem. Flipped polarity on sub and some came back. I had two mix positions (and a chair with wheels) - one at desk and one a couple feet back where the bass lived. Also used headphones and earbuds as reference for lows.
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Post by Johnkenn on Apr 24, 2019 16:54:15 GMT -6
Just donated to site I had a setup in an a-frame once. Speakers set up along a sloped wall. Had a bass problem. Flipped polarity on sub and some came back. I had two mix positions (and a chair with wheels) - one at desk and one a couple feet back where the bass lived. Also used headphones and earbuds as reference for lows. Thanks, man!!
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Post by jcgriggs on Apr 24, 2019 17:06:08 GMT -6
I recently had to tackle a 93hz mode in my room. An acoustician friend of mine advised I build a "diaphragmatic absorber". It's 4x6ft "box" essentially. 2x2 frame with 3/8 plywood on the front and back. The interior is filled with rockwool. I wrapped the exterior with fabric and hung it BEHIND my speakers/desk. Super easy to build, and was surprisingly effective at correcting the issue at 93hz. That's interesting! Unless I'm misunderstanding, a 2 x 2 frame would allow 1.5 inches of rockwool. And that affected a 93hz mode? Is that because of the plywood front and back? I think the rockwool is damping the plywood, not absorbing directly, in this design. The absorption here is from the damped plywood membrane. Regards, John
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ericn
Temp
Balance Engineer
Posts: 14,967
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Post by ericn on Apr 24, 2019 17:26:06 GMT -6
Jeff and I are not in agreement on everything, I’m a speaker guy he’s a room guy, Jeff convinced BradD to buy this gigantic single sub. I said smaller stereo subs, these days Brad seams to agree I was probably right ( besides if I had been wrong 2 smaller subs could have been used as a large mono sub. Still for audiophiles, recording, or just about any space I get asked about the first words out of my mouth are “ call Headback “, yet to hear somebody say it wasn’t worth it. I've got stereo subs (SVS SB-2000's) to use with my Focal Shape 50's. I'm in a small room (12' x 14' x 8' high) with the speakers along the 12' wall. I've got it set up so I can run the Focals alone full-range, or switch to running the Focals high-passed and the subs low-passed. I like what the subs are doing, pretty well under the speakers, but I haven't done a lot of experimentation with room placement. Do you have any general tips? I'm down to one day job only in May and June, the closest I get to a vacation, so I'll have some time to do measurements, I just got the Sonarworks measurement mic that I plan to use with REW. From the above I would say your at my usual starting point, just move things around make marks and take notes.
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Post by LesC on Apr 24, 2019 18:13:53 GMT -6
That's interesting! Unless I'm misunderstanding, a 2 x 2 frame would allow 1.5 inches of rockwool. And that affected a 93hz mode? Is that because of the plywood front and back? I think the rockwool is damping the plywood, not absorbing directly, in this design. The absorption here is from the damped plywood membrane. Regards, John Thank you! I never heard of diaphragmatic absorbers before, I'm now reading some very interesting stuff!
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Post by LesC on Apr 24, 2019 18:14:30 GMT -6
I've got stereo subs (SVS SB-2000's) to use with my Focal Shape 50's. I'm in a small room (12' x 14' x 8' high) with the speakers along the 12' wall. I've got it set up so I can run the Focals alone full-range, or switch to running the Focals high-passed and the subs low-passed. I like what the subs are doing, pretty well under the speakers, but I haven't done a lot of experimentation with room placement. Do you have any general tips? I'm down to one day job only in May and June, the closest I get to a vacation, so I'll have some time to do measurements, I just got the Sonarworks measurement mic that I plan to use with REW. From the above I would say your at my usual starting point, just move things around make marks and take notes. Great, thank you!
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Post by Bat Lanyard on Apr 24, 2019 18:29:40 GMT -6
I used Roxul Safe N Sound, which I found at Lowes, for some 11" bass traps I put in the corners and they worked great. H. Depot on my end, but that's what I used as well. Ultimately, what you said about a strategy is the key, IMO. Your room functioning as a whole.
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Post by hadaja on Apr 24, 2019 19:04:19 GMT -6
www.facebook.com/groups/2117683811849990/John Brandt He offers advice and builds all over the world. HE is a good resource to bounce ideas off. That facebook group has a lot of suggestions that you do need to take with a grain of salt though.
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ericn
Temp
Balance Engineer
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Post by ericn on Apr 25, 2019 7:52:41 GMT -6
www.facebook.com/groups/2117683811849990/John Brandt He offers advice and builds all over the world. HE is a good resource to bounce ideas off. That facebook group has a lot of suggestions that you do need to take with a grain of salt though. Yeah that’s the problem there is so much of a “well this worked for me in my room so it will work for everybody “ mentally when it comes to acoustics. Acoustics and rigging are 2 areas I always defer to the professionals, even if the call begins with “ come on Eric, we have done this before you know this shit.”
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