Suggestions for easy, "good enough" cab sim?

[armstrom]

I'm building a preamp for direct recording and patching into a PA and I'm wondering if anyone can suggest a simple filter network that will help shape the output frequency response of the circuit to sound more like that of a guitar speaker. I'm already using a big-muff tone control which has a good mid scoop to it so I'm thinking I may just need to roll-off some high and low frequencies to mimic how a "typical" guitar speaker sounds.

Would something like the output filters on the Professor Tweed http://www.runoffgroove.com/professor.html work? I know there are much better (and more complicated!) cab sim schematics out there but I'm just looking for something passable that I can tack on to the end of my circuit without a recovery gain stage.

-Matt

[runmikeyrun]

I heard the bulldog cab sim is pretty good, but i've never built one.

[DSV]

For the low pass filter check this project I made.
http://www.diystompboxes.com/smfforum/index.php?topic=71425.0
The schematic of the LPF is on page 4 of  the .pdf document, and is pretty effective as you can tune the cutoff frequency between 3 and 10 kHz. You can add 2 passive (1st order) high pass filters before and voilà, you've got your cab sim. It has got a low output impedance, too