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What acoustic effect, if any, would there be if 3/4" wide x 2.5" deep hardwood wings were added to the rear sides of 3.6Rs? They would attach with the same screws that hold the front trim on, and the purpose would be to stiffen the panels slightly and provide good attachment points for custom made stands. Would the wings cause any negative acoustic effects related to the back wave?
I've experimented with larger baffles on my 3.7. I've used 1x6ft 1" thick oak boards, mounting one on either side using the holes for the trim strips ... i.e. with the board in line with the speakers, not perpendicular. I've also connected two boards with hinges and mounted them on the woofer side only. This also allowed me to experiment with angling one of them.
What I found consistently was that using the boards resulted in a boost in mid-bass ... like +5db between 100-150Hz. It varied, but that's the basic effect. This was useful to me because room modes were causing some cancellations in that range. Since I use Dirac Live I could EQ the response to flat in that range.
I doubt that 2.5" would do anything, based on my observations (and measurements) with the 1-2ft wide baffles.
Agilist, Musician, Photographer, Audiophile
Magneplanar: 3.7, CCR, MC1, DWM; Outlaw: UltraX12, LFM-1C; Emotiva: XMC-1, PA-1; Nord: Nord One NC500DM; Outlaw: Model 7500; OPPO 205
check about 2/3 way down the page on the tweaks page for various wing studies. Most of them were bigger than what you are proposing.
I would make the Wings vary in width across the height of the panel......
My sketch is just the starting point..
Too much is never enough
The wings I was thinking about do not stick out from the sides. They stick out from the back to increase frame rigidity.
Not much comes off the panels other than straight out so doubt there would be much effect. Metal could be used with much less depth to affect things.
Thanks. Square steel tubing was also considered. I wonder if having two fairly massive pieces of ferrous metal close to the tweeter and panel is okay.
Try hollow aluminium profiles filled with (heavy) blasting sand. I think there should be stiffening across the other direction of the baffle, if possible holding the perforated sheet metal in a tight grip.
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