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Old 23rd October 2006, 04:26 PM   #1
diyAudio Member
Join Date: Jan 2003
Location: Ottawa, Canada
Default Aleph 2 turn-on thump

I am going active with my system and will be using my Aleph 2s for the Mid/tweeter section.

The concern I have is that the turn-on thump may cause my ATC mid some harm. Mr. Pass states that the Alephs have a volt or so that causes it (see link).

Nelson Pass comment re: turn-on thump

I also know that a cap on the reference zener can cause more of a thump which I do have on my boards.

My question is: Is there a simple solution to protect my mid or am I worrying too much?

Thanks for any help you can provide.

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Old 23rd October 2006, 09:44 PM   #2
diyAudio Member
Join Date: Feb 2001
Location: Columbia, SC
For a midrange unit, I wouldn't worry too much.
(Tweeters are another matter.)
If it's a problem, put a fairly large value cap in series with the driver; something large enough that the cutoff will be several octaves below the nominal range of the mid. If you're still worried, you can fuse the driver.
I use modified Aleph 2s to drive my midranges (Bohlender-Graebner RD-75s). I run them straight in.

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Old 23rd October 2006, 11:18 PM   #3
diyAudio Member
Join Date: Jan 2003
Location: Ottawa, Canada
Thanks for the reply Grey.

I think I will use a large (~100uf) cap just to be safe. Easier than messing with my amp.
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