Altec 288-8G Compression Driver with Altec 805B Multicell

Рет қаралды 1,328

Күн бұрын

Пікірлер: 22

@artysanmobile 3 ай бұрын

I found a pair of these multicell 805s in 1976 and immediately realized why they were so affordable. They were nasty sounding. I eventually located a pair of JBL horns and lenses, 2397 if I recall, to replace them. It was a different world of sound, even working well indoors for a high level rehearsal system. The full size JBL lens had superb pattern control.

@JosephCrowesDIYSpeakerBuilding 3 ай бұрын

Thanks for sharing. 🙂

@uwuweewee 3 ай бұрын

This is interesting, thanks!

@JosephCrowesDIYSpeakerBuilding 3 ай бұрын

Glad you liked it!

@davidkclayton 3 ай бұрын

Very interesting, I wonder if trimming back the dividers in the mouth of the horn just a little bit would help merge the exciting signal so that there was less combing effect.

@JosephCrowesDIYSpeakerBuilding 3 ай бұрын

Perhaps. The loss of treble on-axis to the cell is likely due to edge diffraction off the cell mouth.

@davidkclayton 3 ай бұрын

@@JosephCrowesDIYSpeakerBuilding Maybe you could 3D print a replica hand grind with a dremel some changes . Just for fun

@mysock351C 3 ай бұрын

I always wondered how these measured, thanks 😀 The distortion figures are quite good at the typical SPL levels we normally use in home audio. I wonder how much it was at the typical SPL levels of a concert? Id imagine adiabatic effects start to dominate at some point due to how narrow the throat is compared to the end of the horn. My brother used to use some Altec horns (maybe those from the A7's or something similar) with 2x15" PA drivers back in the day. I don't remember it being a very nice listening experience, just exceptionally loud. Be interesting to actually hear them in a properly configured setup.

@JosephCrowesDIYSpeakerBuilding 3 ай бұрын

Set up properly they can be quite impressive in terms of scale and dynamics. This horn is what I benchmark for those attributes.

@michaelcorlet2998 3 ай бұрын

Very informative.thanks.

@JosephCrowesDIYSpeakerBuilding 3 ай бұрын

Glad it was helpful!

@yo3429 3 ай бұрын

Thank you! Always wondered about the interference behavior of multicell horns, and there it is :) Not too bad for such a classic design, and a surprisingly wide disperion angle @ 10k. Now I wonder again, what could be possible in 3D print age, with much smaller, rounded clusters and a more homogenius coupling to the throat.

@JosephCrowesDIYSpeakerBuilding 3 ай бұрын

It would still be very difficult to improve. Every element of this design has been carefully considered for the application. My attempts resulted in slightly worse comb filtering but less horn coloration.