I'll try to shoot a pic today. It is totally asymetrical in the back, with open and adjacent spaces.
Corner Bass Traps - Always beneficial?
- Thread starter edorr
- Start date
I'll try to shoot a pic today. It is totally asymetrical in the back, with open and adjacent spaces.
I have the ST2 - Pro. I am using it to do MCH (5.0) on the cheap. I run 3.0 through the Trinnov, and two other channels through another external DAC, and then the delay lines in the Trinnov. I synch up volume control through iRule macros. I am listening to stereo 80% of the time though.
It has been sorted out long ago. However, I did measure with all woofers active before I put in the traps. The woofer defect did not really affect bass response. The curve shape (same null and peaks) was very similar, just a few DB louder. So with the 2 woofers inactive, I simply jacked up the output of the woofers a few Db and got a very similar reponse. In fact, the measurements you see are two woofers active with a few db gain on the woofers. Without this, my null would have been a few db worse.
-----Sorry, I should have known (ST2). Yes it is a stereo digital processor (room EQ).
Wow, it ain't free either (cost few bucks)!
it is actually full blown 4 channels of processing, and then you can run 2 or 4 more channels through the Trinnov to add systems delay. If you can get the synching up of volume control sorted out it works very well for multi channel, for less than half the price of the 8 channel unit. You run mains, center and LFE through the Trinnov, and surrounds through the delay channel. It is the poor man's (relatively speaking) MCH DRC solution...
Ah I see. I must say I'm surprised that the response didn't have a different shape with the additional woofers b/c they would be asymmetrical (different distance to each boundary, suggesting a different frequency response leading to summation which would be different from just 2 woofers) but your results obviously show it not to be the case. More importantly, how do those giant handsets sound????
I was expecting more difference as well. But the measurements don't lie. Almost the same response curve for 2 and 4 woofers.
Bass extension is obviously phenomenal. Highs are very clean and free of any harshness. Mids are comparable to the avalons I had before, but with less stress, because there are two drivers not one.
Here is the other end of the room. I'm sure I am violating some rules by using a couch instead of chair - convenience over acoustic optimization. The white frames in the wall are my in wall surround channels (B&WSignature 8 NT). The opening on the left closes with sliding door if I need total darkness for movie watching. The CDs in the rack are stictly archive. Everything has been ripped to harddrive. There are a bunch of SACD and Blu Rays I still spin.
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-----Hi Ed,
Your surround speakers at the rear corners are your only surround speakers, right?
And please forgive me if I missed it previously, but what are the dimensions of that room?
...Fourteen feet wide perhaps? ...A bit less?
And thanks for showing this picture of your room's rear; it is quite interesting to have that opening in the rear center. I like what you did overall with the speaker's positioning and all that 'bass traps' jazz. :b
Your room is cool for the fact that not all the walls are parallel.
Even your ceiling is breaking off from one straight slab (surface).
And your couch is perfectly fine.
Yes, these are my only surround speakers. I actually have the wiring in the walls for 2 more (side) channels, but I'm not going to bother. My critical MCH listening is 5.1 SACD, which I doubt will benefit from 2 extra surrounds and some algorithm to generate the channels.
Room is 13' wide. I had to work with a lot of physical contraints when I finished my basement - mainly location of supporting walls. There was no space for free standing surrounds, so I asked the guys to frame out the corners so I could fit an in wall speaker. Not ideal, but it works good enough for me. The B&W have very good dispersion, and you do absolutely not hear anything coming from a point source. They just add ambiance (except for the odd old quadraphonic recording [e.g. Deep Purple Machine head] ported to SACD, which will have guitars blaring out of each separete corner).
Lack of good MCH material is still my biggest regret in audio. All the high rez stuff is marginally better to my ears (most of the time), but a very good discrete MCH recording is still my gold standard.
-----Perfect! :b ...No need for extras.
-----I knew it; I just didn't want to say it exactly. ...Honest! :b
-----You did an excellent job!
-----In my signature, there is a link you can click on; there they have Multichannel Classical music selections (and Jazz too), on Hybrid SACDs. ...Probably that you already knew though.
Very nice. I am about to grapple with a very difficult room that is 4.1m wide and 4.9m long but has an old fireplace and chimney protruding 0.8m into the room on the shorter side. Annoyingly, the fireplace/chimney isn't even centered in the room! And I have free-standing Eggleston Rosas as surround speakers.
If this article has not been posted already in this very long thread, I'd be surprised. I just discovered it yesterday myself.
September 2011
How TubeTraps opened up a Whole New Realm of Precision in the Performance of Audio Playback Systems
Notes from the ASC Seminar at the 2nd CAS
Art Noxon
http://www.dagogo.com/View-Article.asp?hArticle=919
September 2011
How TubeTraps opened up a Whole New Realm of Precision in the Performance of Audio Playback Systems
Notes from the ASC Seminar at the 2nd CAS
Art Noxon
http://www.dagogo.com/View-Article.asp?hArticle=919
This is most impressive, especially below 100Hz. I very much like the look of the spaced triple Mega Traps in the front corners - I'm assuming in order to cover the ceiling corner, as there wasn't enough space for a fourth?
Greetings from Switzerland, David.
The corners of a room are not the issue. It is the complete wall surface area. By definition, axial modes are produced by two parallel surfaces not two parallel corners. A corner represents only a fraction of the surface area of the total wall.
Thats interesting--so if the corners are not an issue--can we do anything about these reflections --are they not as evident as shown here?
Appreciate the professional opinion --thank you
BruceD
You have two types of "energy" within your room. You have wave energy which is energy below 100 Hz. You have ray energy which is energy above 100 Hz. Wave energy is pressure based. You must use a pressure based technology in order to adequately treat wave pressure issues. Ray energy which is more reflection based can be treated with technologies that use air flow to absorb the excess energy. Treat the walls with both wave and ray treatment types. If you are concerned with reflections from the corners, treat reflections with the proper technology. A economical treatment type that is predictable and consistent is open celled foam. Make sure you use the proper rate and level of absorption for music and voice. Music and voice are different than noise and have different rates and level absorption requirements.
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