[sdiy] DIY Mixer - please help!

[Tim Parkhurst]

On Thu, Sep 3, 2009 at 6:28 AM, cheater cheater<cheater00 at gmail.com> wrote:
snip
>
> So the question is - how do you make a summing stage that can work on
> high voltages that reach, say up to 75V without distortion, and then
>
75V?!? Are we really sure about these signal levels? This and the 98V
level quoted earlier seem insanely high to me. I could be wrong on
this, never having designed a mixer in my life, but where are you
going to get solid state devices to handle these levels? I'm pretty
sure the last time I looked inside a mixer, it was filled with things
like 1/4W resistors and op-amps in DIP packages. Nothing in there that
would handle a 75V signal without turning the mixing desk into an
expensive BBQ.

>I understand that one trick
> is that if you leave the spikes only in the 'negative' part of the
> signal, they would happen when the tweeter 'pulls' and not when it
> 'pushes', giving you a mellower high-end.

Okay, now THIS I would have to see some proof of. This is starting to
sound like audiophile hocus-pocus if you ask me. Can anyone else
confirm or deny this? I know next to nothing about sound
reinforcement, so I could easily be wrong on the above questions, but
something just don't seem right...


Tim (just don't seem right) Servo
-- 
"Sire, the church of God is an anvil that has worn out many hammers."
- H.L. Hastings