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In Reply to: RE: Question for Satie posted by Satie on August 26, 2016 at 06:20:02
You have it right. Have been running the 3.7 full range and augmenting with the IIIA bass panels crossed over at 90 Hz 24 db. Bass response measured well but only with a RS SLM.
Probably will be better with a first order XO for both the 3.7 and the IIIA bass panels. Marchand can replace the 24 db circuit boards with boards for a 6db XO. Thanks again for your help. Joe Fagan
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First order low pass on Tympani IIIA basses? I doubt it is a good idea, they are high mass drivers not doing that well over 150-200 Hz. A steeper cut-off will leave out the "problematic" high frequences.
The issue is that the LR4 as part of a band pass on the 3.7 bass makes for 2 octaves of phase changes which would be ok on an earlier high order maggie but would make a difference in the coherence of the 3.7. The main point for him is whether he likes the one over the other, since the replacement cards for the XM9 are not expensive and he can try it out both ways.
In my case the TIV bass is far slower than the Neo8 mids so there is a slight degree of congestion that I didn't love in the 250-500 hz range with 1st order symmetrical but the problem with LR4 is that the entire 2 octaves around the XO lose their time coherence and sound phasey. Detail is more prominent and the bass panel's contribution of congestion, however small was gone. But the harmonic structure is disrupted and the time alignment is hurt and takes away from the really great imaging performance and instrumental texture. The latter was more important to me than the sort of disconnected detail you get with the LR4 symmetrical.
I think that at the 80'ish hz XO the heavy bass wire and membrane are not going to be so much of a problem even at 150 hz since the output would be down 8db.
After I located my seating position and distance from the 1.7's,I ran tape lines from the center of the sofa to the distance the speakers would be.I used a straight edge to track along the low pile carpet to make a straight line impression in the carpet that I could see,there by marking the speaker distance line.After setting the speakers the same distance from the side walls and positioned on the line impression in the carpet,I toed them in.I used a angle gauge to toe them in at the same angle.The line impression on the carpet allowed me to use the angle gauge.Having the center marked is good way to be sure that the speakers are equally spaced at the center seating position. I hope that helps your set up.
Dave
I think that is a good idea, but I would still confirm with a mono recording that all drivers are positioned well and the tonal balance is even. If it can't be made to even out just by positioning then you need to start loading the sidewalls with "stuff" to even out the two sides. I am a firm believer in furniture and "junk" as room treatments.
I forgot about the mono listening test.I believe that you advised me to do it and it is a good idea. Best wishes,
Dave
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