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In Reply to: RE: Resocking Tympani's posted by josh358 on August 10, 2016 at 05:50:24
That is a possibility.. Looking at it again it is a better driver for midrange use with higher sensitivity and better bass extension so a line of them can be crossed over lower still and you can play right through fs since the resonance is really small compared to a cone driver. (and this is unlike the resonance freq for the Chinese drivers which is substantial both in the FR and phase. 10db range vs <3db in the Neo8 family)
Still have not found a set of measurements for the Neo8s in a dipole line array.
Some have used a line as a mid tweet in the LS6 and LS9 design approach instead of the Neo8pdr in the original and just noted a lack of air and sparkle. As a couple of DIY'ers said, after using Neo8 variants or Neo10 they consider cone mids obsolete or "like they never existed".
To get a clue as to what it would sound like in a line array, look at the Neo8S FR off axis at 30 and 45 deg, no top octave at all. Needs a supertweeter crossed into play at 10khz. I add in the tweeter at 14-18 khz 1st order.with the Neo8 but don't low pass the mids (a la Apogee and ET in the LFT8) It provides somewhat less head in a vice than having a real symmetrical XO at 8-12 khz. The head in a vice problem disappears as you go down from 8khz symmetrical 1st to 6 khz and entirely gone at 4-5khz.
Follow Ups:
Yes, I think using the 8S as a tweeter is a stretch. I'm intrigued by the possibility of making an acoustic lens with some felt, though, to get the ribbon XO higher . . .
It should be doable but you will need the exact felt spec for the freq range you want to block so that you don't just lose output across the board. Also look at sorbothane as some makers have product particularly designed for acoustic lens use. There is a DIY project somewhere that did cuttings of rather thin sorbothane sheets to get the right thickness profile going into the center area of the driveer (I don't remember which drivers they were adjusting) and I didn't bookmark so I can't tell you where the discussion was.
As IS , you can run the driver to 6khz before the dispersion starts tightening too much. Above that you will start having a head in a vice problem if you keep to a standard XO and the middle (2nd and 3rd order) slope filters are far worse than either the 1st order or the brick wall like LR4 as you go up beyond 5khz Above 8-9khz you don't want to have a low pass on the midrange at all, and just cut off the tweeter and let it enter as a rising FR up from 13-15khz on Neo8 arrays when you measure..
I'm looking forward to experimenting with high slope FIR filters. Had a hangup with my MiniDSP, couldn't download the software, but got that straightened out so should be doing a bypass test/comparison as soon as I'm done with jury duty. My main concern with a high slope filter is that the difference between the Neos and the ribbon will be too obvious.
Re neo8 and ribbon.
Go play a pair of single drivers (just lean them on the floor against the outer edge of the mid panel's frame aimed at your seat) with violin flute and cymbals material on and then the TIVa mid/top both without the bass engaged and compare The neo8 can be run without a filter to quite a high volume or you can run them on the XO box' HP output just to be safe. Since it is 1 driver you will not have canellation of the cavity resonance peak but it will show you how easilty the two sould integrate. I found it very easy to integrate them up to 9khz with either B3 or LR4 and beyond that it was slightly worse that with the lower freq. 1st order was good no matter where you put it. .
Thanks, good idea. I'm in the process of moving everything to the side wall so should be able to try it in the next few days.
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