Recent content by Dennis B

Chris, Thanks. Yes, 30 is one of them. The resonator's dimensions were designed by ETF's built-in calculator. See Link Removed for the program, but I don't remeber if their page actually shows this part of the software. They have a free demo version that you may want to download to try out...

anyone...? :frowning:

Hi, I've built a Helmholtz resonator according to ETF's calculations, have placed it in the appropriate corner, but I can neither feel nor measure (with ETF) any effect at all. It seems to be 'dead'. :frowning: My feeling is that while the math in the program works, the dimensions I've used...

Rick, Actually I was already using 100 ms gating, sorry. When looking at the waterfall or using the time slices, I can see the differences now. Thanks! :emoji_thumbsup:

I ran the LF test and used the default gating (10ms, I believe). Thx.

I finished my first TubeTrap-like 16"x4' bass trap last weekend and have been testing it during this week. I started off with a listening test and I needed only 5 minutes to hear a remarkable improvement in sound. So I moved on to the scientific testing phase :D, started with my self-burnt CD...

This is sounding very much like the same problem that plagued the first Marantz X200 receiver series. The unit was a little too slow at recognizing the input format and engaged the muting circuit during the fist one or two seconds of music.

Karl, Has your SA-8260 arrived yet? I'm trying to gather more impressions on this player, it's got Crystals' CS4397 DACs and HDAMs for analog stages, folks over at Audio Asylum are comparing it to the XA777ES. This is looking like a very serious player... :emoji_thumbsup:

Kevin, I didn't build the diffusor myself. There's a company here in Brazil who manufactures them in polyestyrene according to the primitive root theory, in partnership with a university. They build blocks of 24.4" x 11.8" which you can join according to a particular pattern to cover larger...

Joe, After reading more on John's site, I came to realize that I may have to build a bunch of HH resonators to get where want, and that his "tube-trap-like" approach is more likely to work, so this is what I'm going to try next... big mess at home! :D

Joe, Thanks for the links. I have investigated the Roomlens before, but I thought they weren't the right solution for me. I already have Sonex on my first-reflection points, and I thought they did a great job of improving imaging, soundstage and detail. While you never know and the Roomlens...

I found this one on a paper by Rienstra and Hirschberg, just published (6/10/02): w = c * (Sn/(Leff*V))^1/2, where c = speed of sound Sn = neck x-section (area) V = main volume Leff = L + 2d, L = neck length, d ~ (Sn/pi)^1/2 w = 2*pi*f I'll check tomorrow if it matches ETF's...

Hi, I was thinking about building my own Helmholtz resonator based on the cylindrical model as shown in Everest's MH of Acoustics, but unfortunately he won't give the appropriate formulas for this model. I have ETF and it does the calculations for me, but when I go buy the material, I'd like...

John, Actually that was the first thing I thought about, but my dealer took down all room treatments she used to have because customers were complaining that when they took the gear home, it didn't sound the same... :D For one thing the room was large, maybe 15 x 25 ft, which helps a lot...

Last week I went to my dealer to audition speakers - I'm upgrading to one of the Nautilus as soon as I've saved enough, and being a nice customer of hers :D, she set up a separate room for me to be comfortable moving speakers around. So I walk in the room and there is a pair of 602S3s, N804s...