This is boring but I just use old JBL 1" and 2" used stuff. There is a ton of this stuff around the US. Used deals on C.L. are very common. I just got some ugly old crap carvin Tweeter boxes covered with old peeling tolex and mold on them. the deal was I had to take every thing the guy had in his shed.
Basically a crap load of old misc. Peavey and Carvin junk. But some nice jems in the lot.
Most of you have come acrost the deals before [img]smileys/smiley29.gif
'been using only BMS compression drivers for 4yrs. Some of you like , others not.
BMS 4550-16+pAudio PH4220 (a copy of Beyma TD250) usable with 812Hz /24LR HP for low levels (Home & Studio use).
In much bigger 350Hz horn in PA use with 115dB/4V peak sens. Very good bang for the buck.
BMS 4554-8 in that same big horn, throat enlargened, needed higher xo at 1230Hz. Otherwise it sounded too harsh. May be good for 1600Hz and higher. Companion for BR 12"?
Nowdays I'm using two-way BMS 4594-16 ND with passive xo/EQ, again with this big horn. It was nice surprise. Good no-horn sound, high sensitivity, also in the bullet zone. I'm satisfied for the performance. Passive xo took evenings of whole week to get right thou. Active HP 535Hz/24LR or higher sounded about right. 24Butterworth for some reason sounded bad. (time domain? impulse behavior?)
This is also nice 'cos now with lower xo point, my midbass horn could be made bigger, for good kick[img]smileys/smiley2.gif and no worries about beaming at the upper end of midbass.
I did tests also with 4590-16 but it didn't fit my needs that good. Also heavy (9kg) Could be good for 60x40 or more narrow dispersion horn type. But that's my opinion. I think Tannoy uses 4592ND (2") OEM version in VQ60 & VQ100.
Big 350Hz horn I made, measures W=630mm, H=330mm, D=270. With short adapters it's suitable for 1" to 2" drivers. Theres no diffraction pinch and sides are straight with rounded (r=25,4mm) inner corners. Dispersion 80x40. Mouth is radiused heavily, r=50....100mm. So no honk or that amalgam rippin crap sound[img]smileys/smiley11.gif. Bit big, but hey, 500Hz and upwards point source, CD and low distortion. [img]smileys/smiley2.gif
Have fun, Andy
for reason or another, massive amount of empty lines, now deleted. Edited by: Andywave
I believe it's the DE85 that's used in these coaxial models. X/O's can make all the difference regarding performance with these units, but there are many users world wide, making these a firm favorite with some major PA companies.
Xover is a problem for me with coaxials...has anyone managed to get rid of funny polars at xover point (slap bang in that frequency range..oh dear...) by use of clever slopes (this might just be one of those problems I'm going to have to stare in the face with a design I'm working on...). On the other hand, are there any single units which can go sensibly under 1khz and go reasonably high (12K and higher) without suffering from a breakup?
On another note, has anyone used any of Renkus's HF horns? They look nice, and I've been told you can lay your mitts on them as 'replacement parts' through a R-H distributor.
\'bits of ply round a driver\'
Was thinking about the small compression driver coaxials, but large coaxials are interesting as well. There seem to be two different approaches to it - there's the Tannoy Dual Concentric style route which shapes the plane wave tube and the cone to produce a axisymmetrical horn. Then there's the other route of making a cone as flat as possible, and controlling the comp by other means...like a horn on the BMS ones.
\'bits of ply round a driver\'