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In Reply to: RE: 414 out to 8K.. posted by Joe Roberts on June 11, 2016 at 18:21:44
Thanks Joe! I am planning on using 802's as well. As far as I can tell, the difference between 414A/Z and 414B/C is the flux density (10k vs. 9k) and a corresponding decrease in sensitivity (99 vs. 96 at 4 feet). I think that the 414c would give an honest 97db. Nonetheless, I would need to pad down the HF anyway. I'll probably look at a 2.7 uF cap with an lpad to match sensitivities. All I need now is to stumble upon some unused 802's (or bite the bullet and contact GPA).
Randy
Follow Ups:
Used 802s are good too. Or find dead ones and send them in to GPA for revival.
I have to withhold judgement on the 414C. Never tried one, so I can't say that it will run without crossover like a 414A/Z.
If you can listen to the C full range on female vocals and it sounds pretty good, proceed with the experiment!
Try that with an Altec 15" and the test won't last long. Runs out of smooth at 1500hz tops.
The whole premise of this minimal sort of crossover speaker really depends on having drivers that can do it. The 414A/B is a very well behaved 12" and I think the 414-8C should be also.
If this scheme doesn't work out for you, try a 3kc or 4kc xover. Keep the vocal range in one driver. The usual Altec 800-1200-1500-1800 range crossover chops up the critical vocal band and there is no reason to do it with a good 414.
I stopped at the cap on the tweeter arrangement. Worked for me. Measured OK too, as far as I can trust my in-place, in-room measurements.
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Free your mind and your ass will follow -- Parliament/Funkadelic
Used/dead 802's appear to be on the endangered list. GPA 802's are about $258 each, so would seem to the best option and help support support for Altec products.
We're on the same page with the 414; I would strongly prefer no crossover on the woofer, and it would appear the Alnico 414 is an ideal 12" with a natural rolloff. I've come to prefer that arrangement. I owned a pair of Dynaco A25's with a 10" woofer with no crossover and it was a wonderful sound, albeit a bit polite. The Devore Orangutan runs a similar format and serves as a model for what I would like this system to be.
FWIW, I also have a couple pair of Omega single driver speakers, including Super Alnico Monitors that run without any crossover at all. I have no problem with running relatively large drivers high in frequency.
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