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In Reply to: RE: An alternative to a 'tympani' would be a 20.7 size woofer! posted by Satie on January 23, 2017 at 23:30:39
Well, the label on my other panel reads 62/48. But these would be the frequencies measured at time of manufacture, so presumably the numbers dropped as the drivers broke in and these are meaningful only as relative values. They appear to be tuned do (woofer) re (midwoofer) mi (woofer) fa sol la (all midwoofer). Then presumably you have the resonance of the unpartitioned diaphragm since the hold downs don't extend the full width. And that's going to be the lowest resonance, but it isn't marked on the label.
Thanks for the heads up on the Velcro. That being the case, it occurs to me that magnets might be better. Maybe I can steal a couple of strips out of the speakers . . .
I did fix the radiator myself. It's an unusual arrangement -- single ended steam and I didn't want it venting into the room since I'm sensitive to mold and it releases some steam/brings up musty air from the vent in the basement. So I enclosed the vent and ran vinyl tubing back down to the basement through the plumbing chase, but something blocked the tube over the summer. Fortunately, I was able to get to the bad section by removing an outlet box in the living room on the floor below and didn't have to cut into the wall.
Next step, getting the plumber back to move the radiator to the other wall so I can put the bass panels where I want them! Either that, or get a Class A amp and do away with the radiator entirely. :-)
Follow Ups:
Josh---I've been away for awhile, and am catching up on all the PSA posts. In the meantime, may I ask what are the diffusers I see in the pics of your room? I'll be getting some soon, and yours look about right for my situation. Thanks---Eric.
GIK Gridfusors -- they're lightweight EPS foam which makes them great if you're experimenting with position or can't mount a heavy wood diffuser. But they do dent if you drop them, like Styrofoam. They also have a Styrofoamy-sounding resonance when you tap them, so I suspect wood diffusers sound better, and they don't cover as wide a range as more elaborate QRD's like the Diffractals.
Ah, okay. Are they and those of PI Group basically the same?
Good question. The Pi Audios are a very different design -- they're also QRD's but they're somewhat shallower and more complicated. Should be better in the highs but they say they only diffuse down to 1 kHz or so. I don't know what they're made of, just that they're CNC.
Thanks Josh. The PI site doesn't say, but they look like styrofoam. Really cheap, like $160 for two pair of 2' x 4' diffusors.
Yeah, since they're CNC, I think EPS is a good bet (like styrofoam but about 3x as dense). It is a great price, isn't it.
Cheap yeah, but you're right, they are effective only down to 1k or so. The 6" GIK's work down to around 600Hz, muchas better. I'd love some RPG type---maybe I'll make one. I need to cover a 4' x 4' window dead center between my speakers. The window cavity is 5" deep. Now that I think of it, four of the GIK 2' x 2' x 6" GridFusors would be perfect!
Yeah, the RPG's would be nice, wouldn't they. :-)
I have a window too and I hate covering it because I lose so much light, so I was thinking that what I really need is a transparent polycylindrical diffuser. Unfortunately, as far as I know, no one makes one, so I'd have to bend the Plexiglas myself, which looks to be something of a chore. Maybe we should start a company called "Diffusers For Windows." :-)
Ha! I actually WANT to close off the window (the only one in the room), for two reasons: 1- Although I'm sure my Tympanis were restored with Magnepans new, anti-UV sensitive glue, why take a chance?; but more importantly 2- I want my room to feel like an isolated musical oasis, the outside world being non-existent. My neighborhood is very, very quiet (it seems like the Northwest in general is, in comparison with noisy, congested Southern California), but with no outside light coming into the room, I can actually forget it's out there. I don't know why some people consider me anti-social. ;-)
Heh. I like the sunlight and I got UV resistant windows to protect the Tympanis (as well as less important things like my eyes). Though mine may have the water-sensitive adhesive that came after, not sure.
Patched up my diffusers which had gotten bunged up in transit (for which I got a $50 credit) and from falling off the wall, now I have to paint them and hang them for the umpteenth time, having discovered that tape just doesn't want to stick to them. The paint apparently improves their performance by hardening and sealing the surface.
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