Pro Audio Design Forum

I wanted to post the RIAA EQ Record/Monitor switcher schematic. The first image is the Flat Phono Preamp with Balanced Inputs and Outputs for RAW, un EQ'd, Recording. The second image is the RIAA EQ Monitor Switcher that can be remotely located from the turntable and Flat Preamp. https://proaudiode...

I got it too Paul. Perfectly clear.

I guess I'm confusing matters by using the word tilt. I thought I might have been the one confusing it... I visualize "tilt" as meaning a control where, for example, you increase the low end and there is a simultaneous decrease in the high end or vice-versa. What you've been describing pr...

If I'm reading this correctly the desired shapes would be bandpass with a flat adjustable shelf within passbands. An analogy might be a speaker crossover. The "excess energy in the sub and too little LF energy in the mains that occurred in mixdown" problem you cited would seem to suggest t...

Yes it is. https://proaudiodesignforum.com/images/jpg/JH-110_opto_codewheel.jpg Avago MCI JH-110 Optical Tach Modification The Avago optical quadrature reader mounted to the existing aluminum triangular plate and the metal code wheel, mounted into the existing real motor. There was a F-V convertor c...

I want a four band shelving EQ. Two high and two low bands with frequency selection.

Thanks for that Paul.
What particular frequencies and boost/cut range?
I know you said the problem is often 200-800 Hz.
What top end ranges?

Thanks for sharing that Doug.
I'm glad to see there's a history of the Tilt EQ which predates the 1970s.
"Compensation" is an interesting term.
I think Self points out that these controls are also sometimes called "Balance" which is equally confusing.

You might consider a 12V version for the RV or boat.

Though most are going to have 120V power when parked or on shore power a 12V crock-pot would allow someone to cook the pot roast on LV power without having to run an inverter.

I recall seeing that type of Baxandall ploted where at max boost it progressively changes from a shelving response to a broad bell curve in boost but not in cut. I think many EQs that did that were unintentional from an undersized input C but deliberately introducing it, particularly in a PA console...

For mastering I think one of the appeals to it is both its' broad shelving gentleness (when limited to +/3dB or less) and the fact that its one knob. When the producer asks "Can you make it just a tad brighter?" you only have one simple tweak. The asymmetric example he shows in the OP, wit...