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In Reply to: RE: Here you go posted by josh358 on July 19, 2017 at 18:51:57
Josh, can you make a drawing showing your room? It looks very cramped. How far are you from the MT panels?
My Tympani IVa project is still resting but it will have the low bass driver very close to the side walls of man room, 411 cm wide (13.5 feet). As the driver will be mounted in a narow frame, the total width of the panel will be equal to the width of the two bass drivers. The line up I will try is low bass-tweeter-mid-mid bass for left side speaker and the opposite on the right side.
Follow Ups:
Looking at crossovers that let MTM's work I think you would have terrible lobing problems as the drivers are aligned horizontally as opposed to the common vertical arrangement. You are going to encounter problematic reflections and head in a vise issues despite the low crossover.
That said, it is not something I have tried (for the reaons given) and I am curious to learn how that worked.
Satie,
Do you refer to my post? As I will not use the original baffels/panels. The distance between the bass drivers in my planned configuration is 525 mm center-to-center. The original Tympani IVa have them separated by 460 mm. Besides, in my design the drivers can be placed in any position within the frame holding frame.
It is not an issue of offsets between the bass panels but how the horizontal MTM lobes vs. the MMT config when you time align and compensate for group delay. When you do it on the MTM the T portion needs to sit well behind the bass panels to maintain time coherence with 1st order or low Q high pass crossover. You can overcome that with high order crossovers but you lose midrange coherence in a big way.
My room is definitely cramped! About 14' wide and 13' deep, but L-shaped so partly 17' deep.
Here's a sketch, sorry it's so messy:
So basically the M-T panels are about 5' from the front wall and about 8' apart, and my chair is about 8' from the M-T panels. The mantle and the radiator interfere with the position of the woofer panels and I can't pull them further out in the room.
You'll likely get some lobing because you're separating the bass panels but if the low bass panel is against the wall you shouldn't lose bass extension. Ditto cutting down baffle width if they're against the wall.
Once possibility I've toyed with is putting the midbass panels next to the tweeter panels and then joining the deep bass panels together and putting those on one side of the room. That would cost me some extension on the flanking low bass panel though since there will be nothing on the side.
That's an interesting configuration. I didn't consider splitting up the bass panels in line.
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