[sdiy] equalizer

[cheater cheater]

Well, what I want is a narrow cutoff (like 24 dB/oct? no idea - hints?)
Usual equalizers have 6 dB/oct - right? Or is it 3?
So at 24 dB/oct:
1. The BP would be real narrow and resonant and crappy and shtuff
2. The HP and LP would already give me the whole spectrum. So the BP
would only add stuff - am I right? Or would HP+LP=everything-BP? :)


And in other news:
can anyone recommend a filter that:
1. doesn't have a very resonant sound
2. has a pretty narrow cut-off (24? 12? 18 dB/oct? which ones would you choose?)
3. has a pretty uncomplicated circuit (I'm going to have to have a lot
of these in an equalizer it seems - and even more in a whole mixer -
woe is me!)
4. (a plus but not needed) sweeps don't have the usual cheezy resonant
whistle sound

This goes for LP and HP. I'm counting on you synth freaks here!

Regarding 3 - am I right to think that SMD components would make the
[6x2x5=60 (!!!!) (4 bands)x(stereo)x(5 channels)] SIXTY filters easier
to tune up? Don't they usually fluctuate less? In any case I guess
it's a must considering space and such...
I'm *so* buying metal film resistors... and 2% caps.... *cringes*


Also: anyone got the Electrix EQKiller schematic?
Or the Vestax DCR-1200 Pro?
I'm very curious what kind of filters they're using, and what order they are.

Cheers!
D.
8)

On 10/8/05, harrybissell <harrybissell at prodigy.net> wrote:
> Steven Cook wrote:
>
> > A state-variable filter has three simultaneous outputs: lowpass, bandpass
> > and highpass. I suspect that mixing all three outputs together would
> > reconstruct the input signal with reasonable accuracy.
> >
>
> True... but the corner frequencies cannot be (individually) controlled... and are
>
> really unlikely to be useful in an EQ application.
>
> H^) harry
>
>