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[vansinn]

^ indeed, which creates an interesting effect, with some common effect when adjusting treble and presence not too much, but at the same time, treble, with it's more narrow bandwidth, having a more sharply defined impact when up'ed more.
BTW, while this works just fine, there are times I would want treble at a touch lower frequency - which would be fairly to calculate.

..Seems at least 800Hz is indeed shared by the Tone Control and Graphic EQ..

In terms of frequency, yes; still two separate filters, though, each in it's own tonestack.

[MarshallJMP]

Cleans

Bass;            76 Hz Q=0.53
Mid;            485 Hz Q=0.95
Treble;      4400 Hz Q=0.54
Presence;  6298 Hz Q=0.52

[MarshallJMP]

Like Van says ,2 seperate filters with a different Q factor,the EQ points have a Q depending on the band between 4.2 and 4.5,so much smaller bandwith compared to the tonestack which is between 0.5 and 1 depending on the band.

So it's a 1/3 octave EQ (Q=4.36) if someone was wondering.

[rnolan]

Hey MJMP, thank for the research 

[MarshallJMP]

No problem ,i needed to clean up my transferfunctions on filters anyway 

[vansinn]

^ you're not alone on this. Which literature are you using? - I need to reacquire books on these topics.
My old analog teacher wrote an excellent book on filters, but it's in Danish, so..  (IIRC: "Sådan bygges aktive filtre", by Jens Langvad)

[MarshallJMP]

I'm using the holy bible of electronics; The art of electronics by Horowitz and Hill.Got all 3 editions.