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In Reply to: RE: Here you go posted by emailtim on July 12, 2017 at 12:40:01
PS forgot to include the room size. Front-back it's 13' or 17' -- there's a big entrance arch that opens up onto the hall. So L shaped. That 17' part really helps with the bass since otherwise the room would be almost square, but it's over a bit too far to benefit my listening position.
I actually considered knocking down the wall -- this room was originally much bigger but they built a small bedroom in one corner. Obviously a major project, but it would become a much better room if I did.
The wall the speakers are against is 14'-6" so it's the long wall if you use the 13' dimension for depth.
Originally I'd hoped to put the speakers flanking the fireplace but the mantle screwed up the sound and I would have had to do major surgery to flush the wall out and fix that so I went back to the sideways arrangement.
At some point, I'm going to try putting some broadband absorption behind my listening chair, the usual recommendation if you're sitting against a wall . . .
Follow Ups:
Almost exactly my room's dimensions---13' deep, 14'4" wide, putting the panels "on" the long wall, firing across the shorter dimension. I could reverse that, but I like the extra width to get the Tympani panels further apart if I don't stagger them, and because of the window and door locations, which are symmetrical this way.Speaking of doors, there are two on the wall the speakers face, one to a bathroom, the other to a walk-in closet (the room is the master bedroom in the house). I can experiment with having them closed, open, or partially open. I assume the bathroom door should be closed for listening---who wants to listen to the echo of tile?! It has occurred to me that the closet could be modified to act as a Helmholtz resonator, installing a limp mass in place of the door!
Remind me again---in Tympani-IV's and IVa's, which bass panel is deep bass and which is more midbass? The one with tuning dots is midbass? The one with the terminal plate having the connectors is which? I remember Satie (I think it was) saying if those panels are placed right up against the side walls, the deep bass panel should be closest, rather than the midbass panel. Am I remembering correctly? Thanks all---Eric.
Edits: 07/18/17
Yes, I place the deep bass panel at the wall when they are separated from the MT and placed against the wall for wall loading. That placement with the bass panels facing dead forwards towards the midline of the room provides very powerful deep bass given sufficient power. In that scheme you minimize the dipole cancellation on one side and capture the room's tangential mode which is the deepest bass mode of your room while the side to side mode is minimized so that your bass is a bit more uniform. Add rigid bracing and you can play your organ spectaculars convincingly.
Love your closet Helmholtz resonator idea. Actually you can do that with walls too, build them as inexpensive bass traps if you're building a room from scratch.
For doors, I tend to think it sounds good to break up the regularity of the room. That reduces modal problems (my woofers sound a *lot* better firing into the L-shaped part of my room) and also delays reflections which is almost always good in a small room. Bathrooms make good echo chambers, I'd try it with the door open and closed and just go with the one you like and not worry too much about how accurate it is because 2 channel stereo just isn't accurate, it can't be, it needs to take advantage of your room acoustics.
The center panel is the deep bass panel. This provides maximum baffle width where it's needed most. But it isn't really quite as simple as that, my IVA's have their second lowest resonance section on the midbass rather than the bass panels, presumably to take advantage of proximity to the floor.
Satie's right that if you separate the bass panels you should put the deep bass panel against the wall so that the wall becomes in effect a baffle extension.
Hey, has anybody tried filling the gap between the woofer panels and the ceiling to create a 1D infinite baffle?
Tympani IV has three buttons on the mid bass driver, none on the low bass. Connection plate is on the low bass section.
Tympani IVa has three buttons on the mid bass and one on the low bass driver. Connection plate on the low bass.
Great, thanks all.
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