[sdiy] tonal tilt

[JH.]

John you started something with that thread !

It has immediately caught my interest, and last night I finally finished 
building it.
It's not exactly the Quad circuit, but almost: I couldn't get the bass part 
to work with any standard potentiometer, so I used a 9-position rotary 
switch and a set of resistors I have determined by simulation to match the 
published frequency response courves, and while I was at it, I used another 
9-position switch for the Tilt function as well.

What can I say - after listening to this on headphones: This is the most 
remarkable tone control I've heard in my life.
The Tilt control really changes the overall tonal colour of the material 
without sounding artificial.
The bass control sounds very "right" as well - but I've yet to test thison 
speakers, where the -6dB step at variable corner frequencies is supposed to 
have its real application (working against exaggerated bass when the 
speakers are located near corners.)

No sound samples yet - just some enthousiastic feedback after a first 
listening test late last night.

JH.

----- Original Message ----- 
From: "John Mahoney" <jmahoney at gate.net>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Friday, October 05, 2007 8:23 PM
Subject: [sdiy] tonal tilt


There was a hi-fi preamp or integrated amp back in the 70s that had a
unique tone control that may have been called "Tilt". You could set
the tilt to flat, up, or down. It would change the tonal balance by
*gently* changing the frequency balance.

Picture a frequency response graph. With flat response, the graph is
a flat line. Now visualize a line that starts 1 db below flat at 20Hz
and ends 1db above flat at 20kHz -- that is tilting it up; the
response is now +2 db at 20kHz relative to 20Hz, but there are no
peaks or dips in the frequency response.

A tilt control would be pretty neat for warming or thinning the tone.
The concept is simple. I don't suppose that it's electronically
simple, too. Thoughts?
--
john


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