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as usual, I left out an important point

Posted by BS64 (A) on December 13, 2010 at 04:59:47

In Reply to: RE: speaker/chair placement and their limitations posted by David Aiken on December 12, 2010 at 12:15:00:

David,

When I originally posted, I really didn't have a certain freq band in mind. And believe it or not, the bass really has not been an issue as I thought it would be with rear-ported floorstanders rated down to 24 cycles.

When I play tracks that are not too "busy" at moderate levels, the presentation is really good. Sitting closer, in a more intimate setting, is allowing me to hear subtle details I was not picking up on in the bigger room.

But I am a R&R fan, too. And it's the beaming highs that are fatiguing. I used my Rives Audio test cd the other day for some experimentation. I had the RS meter setting on the couch back cushion, so I was behind the couch and under the sloped ceiling. As the freq's got higher, the more fatiguing it became. But I also cannot help but think that these mid-high reflections are having an affect on the imaging/soundstaging on the mellower listening sessions.

The partitions I tried to describe would be made from pieces of 2x8 in the form of a component rack, wrapped with wire mesh and then some sort of acoustic material (mineral wool, recycled cotton panels, fiberglass or foam). I would place them behind the couch during listening sessions, diffusing and absorbing first-arrival, and reflections that are making their way back to the listening position from behind.

The downside to panels is that they would be taking up floor space while not in use. The upside is that they would be less expensive. Treating the walls will require more acoustic material, but it would be a permanent installation up off the floor. I am leaning more towards the permanent install.

So here is where my plan stands for now: buy 2'x4' panels of acoustic absorption material. Choices in descending order of cost are wedge foam, recycled cotton, fiberglass, mineral wool. That is misleading though as the fiberglass and mineral wool would require fabric covering, bringing the cost up to the cotton and foam level. Buy some 4'x8' sheets of coroplast from the local FastSigns franchise, cut it to a 7' length, and glue 3 panels to it spaced equally apart. Remove the excess coroplast from between the panels except for some "tabs" for mounting to the sloped ceiling. The goal is a mounting secure enough for an "upside-down" installation with minimal intrusion to the drywall.

I could also put single panels at first-reflection points, and more importantly, the entry hallway coming into the room. The hallway acts as a waveguide, making the sound just as loud if not louder outside the room. I installed a solid-core door and weather stripping, but any listening done after bedtime requires low volume levels. It would be nice to be able to turn it up a little louder without worrying about too much of the sound making it's way past the door.

Coroplast comes in black, as does the cotton and foam. The room is painted burgundy including the ceiling, so black will blend in and be less visible with the lights low.

Again, thanks for your input. Let me know if you detect any flaws in my plan. I would like to move forward with this project immediately following the holidays.

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