802 vs 902 compression drivers

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Originally Posted by Panomaniac

How 'bout 7 years, then? ;)



Do you use the loading caps with your lite frams?

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With the 806-8A's I have have loading caps with the 23744 they sound great too...

I was thinking a few months, But who knows as long as you don't smoke the frams ??? :) http://www.hostboard.com/forums/mysm...mysmilie_6.gif

But the 802-8G's/23744's I have, have the felt in the caps and I just think they sound the best to me.

Pano for me you got to lose the symbiotiks for home use IMO.You won't be disappointed I've bought more than a few drivers just for that fram 23744 when I could verify it had good looking leads that's were they tend to break when fatigued.If they are at right angles you have a fram on it's way out !!! :coffeedrinker:

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Originally Posted by Altec Best

A Buddy of mine Dave Wojo said that Zilch over at AudioKarma had measured a driver with the loading caps and the felt and could find "No Differance" in measurement I never did the experiment myself though.

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Which driver? The 802-D should show a higher F3 roll-off similar to what JM measured on a 604E: Altec Compression Driver Rear Loading Caps

*More measurements: http://db.audioasylum.com/cgi/m.mpl?...+bp&r=&session

Another thing to consider is that weak magnets would measure similar/same.

GM

Hi Gm, I'm not sure which driver he had measured when he mentioned it was in general terms of the differance between the loading cap and the felt.Unfortunately Dave went away today and won't be back till middle of March but will ask him when he gets back.

As far as I know it is posted over there at AK I have to go out for a couple hours but I will do a search when I get back to see if I can find it we were talking about my just purchased 604-8G/612C's at the time but I'm under thee impression it was a small format driver 802,806, when I get back I will try to find it though.

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Originally Posted by analog addict

Slightly OT, but anyone want to comment on how the 908 fits in here, perhaps in comparison to the 806?....

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Do a search, IIRC TW? said it was a re-badged EV driver. All I know about it is some measurements posted awhile back mounted on a 511. It rolls off ~2nd order from ~3 kHz, so -12 dB ~6 kHz, making it strictly a wide BW mids/lower HF driver without massive EQ and if it is EV, probably not a high SQ one either.

GM

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Do a search, IIRC TW? said it was a re-badged EV driver.

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I believe that is actually a 906, a modified DH1.

Pretty sure the 908 is just a ferrite 808, probably becomes a 902 with the installation of a 34647.

Wow, we really are talking in code now!. ;)

I'm eager to hear the 802 with better frams. I have not heard the 902, unless the CDs on the 604-8K count.

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Originally Posted by bowtie427ss

I believe that is actually a 906, a modified DH1.

Pretty sure the 908 is just a ferrite 808, probably becomes a 902 with the installation of a 34647.

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Oops! You're right: 908-8B COMPRESSION DRIVER

GM

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Originally Posted by magnarc

Only recently found out that some of the 902s have a smaller throat 7/8" vs 1" on the 80x series.

Is this the case for all of the 902s or just a certain run.

Is there any impact on sound quality?

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What I know; Early Altec 902s were 7/8", all 909s are 1".

What I don't know; if Altec ever made 1" 902s, or what GPA's are (seems like someone said 1").

Given the 90x already marginal low end, I'd not suggest the 7/8" models for XO below ~1KHz. If using 7/8" drivers on 1" horns, I'd fab some thick gaskets/spacers with tapered holes to smooth the transition.

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Originally Posted by bfish

What I know; Early Altec 902s were 7/8", all 909s are 1".

What I don't know...

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***Epiphany***

Zippy Sez...

"If it's 7/8", it's a 902, 1" is a 909"

:doh:

But that would be too simple...;)