Attenuator Diagrams 30904/30923

[Art J.]

This may help with some past uncertainty about the Altec attenuators.
Let me know if the link expires. Art.

http://xs75.xs.to/pics/06145/Altec3090430923.jpg

640x480 printable

[bfish]

Thanks Art!

[Barossi]

Hi Art J.
does this network function with 8 or 16 Ohm speakers?
BTW do you know, with wich kind of drivers is this useful/ was it originaly disigned?

Greetings Barossi

[Barossi]

Hi Art J.
does this network function with 8 or 16 Ohm speakers?
BTW do you know, with wich kind of drivers is this useful/ was it originaly disigned?

Greetings Barossi

[Art J.]

Hi Barossi, they are meant for 8 ohm drivers. If you want to use it for 16 ohm
you can change C-1 value to 3uf for the same results.

See the Driver Reference link below to see where they were used.
Mainly last 2 pages. second to last column.

http://www.lansingheritage.org/html/...975-driver.htm

[bfish]

LOL! I was huntin'-n-peckin' while Art was posting! Summarized from Art's linked reference;

The 30904 was used with the 411-8A and also the 413-8A in the Barcelona, Granada, Santiago, and the 9846-8A. The 30923 was used in the biamp versions of the afore-mentioned consumer models, as well as the 9846A, B, and BX, the biamp versions of the -8A. All were 8 ohm systems. Their purpose is to attenuate the HF driver when used in conjunction with the less-efficient 411 or 413 "Dynamic Force" LF drivers. The 30904 is also appropriate for any DIY system utilizing the 411 or 413 in conjunction with Altec HF drivers and standard Altec XOs.

[ngccglp]

Hi,

May I know what the Zobel network does to the bass? Thanks.

[Art J.]

Zobel

This link makes up for my lack of writing skills

http://www.trueaudio.com/st_zobel.htm


.

[ngccglp]

Hi Art,

Thanks. Can I use the Zobel for the 416-8A? My XO is about 500 Hz.

[sekess]

Hi Art,

What kind of caps are those in the 30904 network? I have the same type in an Altec xo that I am using and was wondering if they are electrolytics or not?
Thanks,
Steve