Ping Ethan (NZ Update)
202.49.164.17 |
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| Posted on January 27, 2013 at 13:58:03 | |
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Posts: 1014
Location: PNW (summers) and Southern AZ (winters) Joined: December 2, 2006 |
Hi Ethan! Hope the new year is treating you and yours very well. The Music Room here in New Zealand is coming along, but I have encountered some strange and unanticipated results that I'd like your advisements on. First, I wanted to go with your suggestion of widely spaced studs and thin drywall, but the local building council required very narrow stud spacings and 5/8" thick gypsum board for strength due to the very tall (14.5') ceiling at center. I assumed I'd have way too much bass in this huge pentagonal room (31' x 22' x 14.5') with sloped hard wood ceiling and ultra-rigid walls, so I installed floor-to-ceiling corner tunes consisting of sealed plastic bags of thick dense commercial fiberglass insulation in all five 'corners'. To my surprise I have a fast drop-off of bass below 50 Hz, with a relatively flat response from there (50 Hz) on out to around 4000 Hz, where things suddenly jump up for an 8-10 dB rise across to 8000 Hz, then drop back to normal until 12,000 Hz, whereupon they do a relatively fast and significant roll off out to 20, 000 Hz, where they end up down some 22 dB! The room sounds low bass-shy and can get quite aggressive in the upper mids and lower treble, as the frequency readings would naturally indicate might be the case. I am considering removing the corner tunes (a major PITA) to help the low end, but wonder how effective that would be on the very low (<50 Hz) bass response, versus the mid and upper bass, which is no problem currently (and do not wish it to become so!) As for the upper mids/lower treble aggression, THAT is something I would like to eliminate, but already have nearly full coverage (floor to ceiling) on the front wall and partial coverage (floor to 6' tall and 10' wide) on the side wall first reflection points with Sonex that acts from around 250 Hz on up. Listening position currently is at 30% of the room length from the front wall (as per your idea in one of your posts), with the speakers widely spaced in near field position relative to the listener seat, about 20% out from the front wall. I have tried various other configurations, including all the way out to speakers being mid-way into the room and the listening position near the rear wall, with some small to decent changes in bass response, but very similar response on the upper mids/lower treble range respecting that rise from 4k through 8k. (It should be noted that bass response is dramatically stronger at the boundaries, again, as one should rightfully expect.) Wondering what you think/suggest for dealing with these two problems, especially the upper mid/lower treble aggression. For the latter, I can install absorption panels on the ceiling, and on the side walls to the roof, but was wondering what your feelings were. I can provide any further info you need upon request. Many thanks, Ethan! Cheers, W S
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| RE: Ping Ethan (NZ Update), posted on January 30, 2013 at 08:08:11 | |
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Posts: 18
Joined: November 23, 2012 |
What are you measuring with? (software & mic)
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| Radio Shack/Rives Disc (Nt.), posted on January 30, 2013 at 09:43:04 | |
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Posts: 1014
Location: PNW (summers) and Southern AZ (winters) Joined: December 2, 2006 |
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