I have been surprised many times by long lasting rubber-like products disintegrating in the presence of other plastics, some types becoming brittle with no tensile strength left, others turning to mush the consistency of printer's ink.
The "rubber" surrounds may have suffered from a chemical reaction with out gassing from the resin used for your horns.
BUT those are only OEM unless there is a LARGE group buy. Most of the people that have the 4" Celestion's bought them a little while ago during the GB. From what I gather there are a LOT of drivers that can be used. SO its a matter of sifting through a lot of threads and reads and seeing which you would like to go with. 2"-6" drivers have all been used.
Wonder what these are like [once the grills are popped off of course]: Power Acoustik 120W Sealed Back Midrange 4 Inch with Cover | XPS-104 (XPS104) | Power Acoustik
GM
GM
Look like these places will order them:
Celestion TF0410MR 4inch Midrange Speaker 25.00
Celestion Truvox 0410 MR (8Ohm)
I stand corrected.
I tried ordering these years ago but couldnt. Now I can thanks for the link.I picked up 12 of these. Very cheap.
Titan MD-888 5" Sealed Back Midrange Speaker 4 Ohm
I'll probably play with them until something works.
Titan MD-888 5" Sealed Back Midrange Speaker 4 Ohm
I'll probably play with them until something works.
Possibly Unity/Synergy Midrange drivers alert
Just checked at Parts Express and found these:
https://www.parts-express.com/visaton-m-10-4-sealed-back-cone-midrange-driver-8-ohm--292-594
4 inches, 700Hz resonance, looking feasible. Cloth surround and sealed back too.
https://www.parts-express.com/acoustic-research-1210129-0b-2-poly-cone-midrange--299-2040
2 inches, sealed back! 1200Hz resonance. But its a buyout (bummer). Still worth a shot, I think, for those of us who like high Synergy tweeter crossover points.
Just checked at Parts Express and found these:
An externally hosted image should be here but it was not working when we last tested it.
https://www.parts-express.com/visaton-m-10-4-sealed-back-cone-midrange-driver-8-ohm--292-594
4 inches, 700Hz resonance, looking feasible. Cloth surround and sealed back too.
An externally hosted image should be here but it was not working when we last tested it.
https://www.parts-express.com/acoustic-research-1210129-0b-2-poly-cone-midrange--299-2040
2 inches, sealed back! 1200Hz resonance. But its a buyout (bummer). Still worth a shot, I think, for those of us who like high Synergy tweeter crossover points.
The visaton has no thiele small parameters, I do not now if that can be measured with a closed back.
regards
You can measure with a closed back, using added mass method. It is analogous to an open-back driver with very low compliance -- the sealed air volume is the same as added stiffness. When you put the values you get in HornResponse, model the arrangment as if it there is a huge back volume then (which would add no additional stiffness).
Would take quite the midrange (and packaging!) to reach up to 2k-2.5k to reach a 45-50 degree (horizontal, perhaps even less vertical) conical horn-loaded ribbon/planar.
A whimsical part of me wonders if some of the 2" full rangers couldn't reach up to meet something like: https://www.parts-express.com/dayton-audio-ptmini-6-planar-tweeter-6-ohm--275-083 (for the fun budget synergy)
A whimsical part of me wonders if some of the 2" full rangers couldn't reach up to meet something like: https://www.parts-express.com/dayton-audio-ptmini-6-planar-tweeter-6-ohm--275-083 (for the fun budget synergy)
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Bill--thanks. Which driver in specific do you have on order?
My application is looking at putting them in the upper corners of my living room, so I can afford to drop down to a 40/50 degree throw at HF, then an early Keele transition to get better LF loading/control before handing off to a wall and ceiling.
Am curious how well it'll work. Should be fun nonetheless.
My application is looking at putting them in the upper corners of my living room, so I can afford to drop down to a 40/50 degree throw at HF, then an early Keele transition to get better LF loading/control before handing off to a wall and ceiling.
Am curious how well it'll work. Should be fun nonetheless.
The M 10 is the ones I ordered.
You should be able to get a 40/50degree horn working (Danley's orig is a 50x50), but keep in mind that kind of horn will get pretty long if you're going for a low cutoff. A 40x40 for 400Hz will be about 42 inches long (and about the same height and width). That's one of the reasons I like 90deg horns, they don't need so much depth!
You should be able to get a 40/50degree horn working (Danley's orig is a 50x50), but keep in mind that kind of horn will get pretty long if you're going for a low cutoff. A 40x40 for 400Hz will be about 42 inches long (and about the same height and width). That's one of the reasons I like 90deg horns, they don't need so much depth!