[HAM] Q: Bit more "hump" - story of two a100's and one 122

[Jeff Dairiki]

On Fri, 2006-11-24 at 01:28 -0800, joe doria wrote:
> What are the reasons (if even valid) for the leslie connected to the
> a-100 - 
> where the 6-pin is coming off the ao-39 to appar to sound like it has
> more 
> "hump" (bass hump, tad more power it seems, etc) over the the other
> a100.
> 
> Is there a valid reason?
> Is it impossible that there even could be a difference?

Someone built some sort of custom leslie kit into the AO-39.  The
answers to the rest of your questions depend completely on how that was
done.

I would guess the most likely situation is that someone built the
equivalent of a standard G-G to 122 kit within the chassis of the AO-39
(there is speed switching, right?).  In that case the bass hump is
probably either in your head or due to some other difference (difference
in the A-100 --- TG calibration, AO-28, etc, etc. ; or perhaps differing
room acoustics?).

If the "kit" is hooked into the speaker-level outputs of the AO-39, then
there is a shelving treble-cut/bass-boost circuit in the input of the
AO-39 which will make the feed to the 122 more bass heavy (or
treble-light).   The difference, in this case, would not be subtle, I
think.

Anyhow, the main point is you have some sort of custom-wired hookup, so
that until you know what's in there, you don't really know what's in
there.