How can i simulate an acoustic guitar using a parametric EQ?

[gigimarga]

Hello,

Sometime ago i borrow from a friend of mine a Boss PQ-4 parametric EQ.

Using the settings from the bottom of the page http://www.bossarea.com/loadpage.asp?file=boxes/PQ4.xml I got an acceptable acoustic guitar-like sound on my Squier Affinity.

So, when i found the DimebuGG's project of Ibanez PQL i was very happy (and still i am...), but later i saw that it have differents pots from the Boss PQ-4.

The question is: how can i simulate an acoustic guitar using a parametric EQ (generally) or Ibanez PQL (particullary)?

Thx a lot!

[dschwartz]

i don´t want to hijack your question..but as we are talking about acoustic sim here.. does anyone knows where to find acustic guitar´s frecuency response?

[gigimarga]

I had a Boss Acoustic Simulator AC-2 sometime ago and it sounded decent to good.
I think that if you look to the schematic (i if you understand it...) you can find the frequencies...

[Ben N]

Why not build a PQ-4?
http://www.synthdiy.com/files/2007/boss_pq-4.png

[DimebuGG]

hmmm.."W" tapered pots?are these most likely linears?or reverse log ones?

sorry I don't have an idea..

[Ben N]

Y'know, I so glibly posted that link, but didn't really look at the schematic--those would appear to be tapped W-taper pots, no less--and I surely have no idea where to go for that. I don't know what C-tapers are, either. And, frankly, that is a rather involved beast for a DIY project.

Gigimarga, have you looked at other parametric or semi-parametric designs, like the one RG has at his site in the equalizers article? There is a very recent thread (I posted to it this week) about parametrics, and a number of links to different DIY or DIY-able designs are posted. It would seem that if you have two parametric bands that can center at the same frequencies as the PQ-4, along with high ("presence") and low pass bands, you ought to be able to tweak your way there. While you are at it, you might want to use Search to find the threads dealing with Mark Hammer's Woody (I know that sounds terribly intimate, but no... ), not so much for the actual design as for the discussion of the parameters that would make an effective acoustic-simulating EQ. Mark has also made some thoughtful posts on generally the right balance between musicality and flexibility in a guitar-specific EQ. Between those, RG's article (no exotic tapers, tapped pots or dual gangeds required) and some of the other posted stuff you might be able to roll your own to suit your needs.

[gigimarga]

Thx a lot Ben N!
I forgot about the R.G.'s articles...i will read soon!

[gigimarga]

 

[mdaudet]

I have a parametric EQ with three controls: Boost/Cut, Bandwidth and frequency.

Setting the pedal like this: Boost at max (18dB), bandwith as a narrow curve and the frequency pot set to max (7kHz) i get a convinceable but non realistic acoustic sound. The trick is achieved best with the "out of phase" strat position (neck & middle pup). With a graphic EQ I dial some notches and boosts to get a more realistic sound, specially cutting some mids around 800hz.

So, it's possible? yes it is, but its another approach than the regular Acoustic simulator pedals.

cheers.

[gigimarga]

Thx a lot...I will try as soon as possible!

[dschwartz]

hmm i think the key here is to compensate for all the frequency responses produced by the pickup, amplifier and speaker..
that means evening out the freq response back to the original string vibration..

PU´s rol off really steep from 4kHz and above, with a peak on that freq..and speakers have a similar response..

i´ll start designing something based on that..