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In Reply to: RE: Another First Reflection Trap (FRT) Adventure : Quasi-Ambiophonics posted by josh358 on March 03, 2017 at 12:28:17
Josh358: "I take it you're still using your original setup at home?"
Short answer is yes, unfortunately I don't get to listen to it as often as I'd like.
Longer answer: I have tried to do the setup shown by st.chelvam, and got pretty good results. I used my 2 FRT panels as the barrier, stiffeners touching so the total barrier was about 4" wide, and using those foam pipe insulators on the forward edge as a headrest. I had my Gunned MMGs touching the FRT panels, about 4 feet away from my ears. So the angle between the tweeters was between 10-20 degrees, which should be ideal. I was thinking, though, that the fact that the FRTs are wooden panels did the configuration a disservice, since the high frequencies bouncing off the hard surface might have had a smearing effect. So I have a plan to glue some insulation to that reflective surface (thinking the textured foam used as mattress cushions) to reduce those reflections. These reflections don't seem to be a problem with the separated configuration I wrote about initially, btw. Haven't had the opportunity to do that yet.
And besides, the separated configuration allows for a TV screen so I can control the music selection or watch a concert video. Can't do that with the barrier dead center. Although a VR reality set of goggles would make that possible... ;-)
MG-bert
Follow Ups:
" So the angle between the tweeters was between 10-20 degrees, which should be ideal."
The crosstalk effect only effective for frequencies below 4000Hz. You may get a better result with the midrange separated by 10 to 20 degrees.
STC: "The crosstalk effect only effective for frequencies below 4000Hz. You may get a better result with the midrange separated by 10 to 20 degrees."
The crossover of my MMG speaker is actually at 1,000 Hz, so the tweeter is handling those frequencies. Working out the geometry I used when I had the speakers as close together as the 4 inch wide barrier would allow, the included angle between tweeter quasi-ribbon centers was 16.6 degrees, and between woofer panel centers was 23.5 degrees. Actually a bit less because I had rotated the panels a bit to reduce phase differences between the woofer and tweeter at the listening seat.
I agree; if I sat further away from the speakers (I actually had my forehead up against the panels I used as the ambio barrier) the results may well be better, especially since the high frequency "smearing" should be directed more away from the ears. I will try that later; too much going on now to devote time to reconfiguring the system.
Which angle should govern: if getting the woofers within a 20 degree included angle means the tweeters are closer than 10 degrees included angle, is that worse than the tweeters being right at 10 degrees but the woofers being greater than 20 degrees? I just had a thought of a new barrier configuration to try, with my 2 FRT style panels touching each other in the plane of the MMG speakers and spreading out to 4" to 6" wide closer to the listener. In other words, a wedge-shaped barrier vice a standard rectangular barrier geometry, as seen from above. That SHOULD direct any smearing early reflections from the FRT panel surfaces further still from the listener. Also, that would allow me to bring the MMGs even closer together; hence the angle questions. Thank you for your interest and assistance.
MG-bert
MG-bert wrote "Which angle should govern: if getting the woofers within a 20 degree included angle means the tweeters are closer than 10 degrees included angle, is that worse than the tweeters being right at 10 degrees but the woofers being greater than 20 degrees?"
I see your point. I guess you can only tell which is correct by experimenting.
Thank you for sharing your setup.
Yes, the ambio barrier articles I've seen all mentioned absorption. But since it isn't practical and I was able to hear the effect with just those slabs of pink styrofoam I'm not going to try it.
Need something more practical! I'll give your barrier setup a more careful try, and also try the RACE setup again, although I'm stymied because even if I can get the Maggies to work I have the same problem you have -- I need to put a screen between the speakers. In a perfect world, I'd have a huge room and a motorized acoustically transparent screen, but realistically, the only way I can think of to do this would be to push the speakers together for music listening and use the laptop rather than the projector.
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