The 'Art' of speaker emulation

[ROOG]

Presumably you could use a dummy load rather than a speaker with either the EDI or Redbox?

[ICBM]

Presumably you could use a dummy load rather than a speaker with either the EDI or Redbox?

Yes.

[Big Paulie]

Have you thought of something along the lines of Runoffgroove's Condor cab sim?

[ROOG]

Yes, I assumed that this is the type of circuit that would be used in the 'Redbox' type products, although the Condor cab sim looks like it is designed to accept small signal input rather than speaker level.

[Big Paulie]

You are of course correct.

My apologies: should've read the OP more carefully.

[ROOG]

/\ never the less, this is usefull information.

I am interested in making a reactive dummy load to connect to the speaker out, incorporating an emulated speaker DI/headphone out. The commercial options for this type of product seem to be expensive.

[koneguitarist]

Yes.

Like the Red Box, it's even simpler if the amp has two speaker jacks - just connect the box to the second speaker jack, which does not even need a speaker cable if the power to the cab isn't going through it. This is better because it avoids the potential unreliability of passing the speaker current through an extra cable and two jack connections - I'm not sure why they don't mention this in the Red Box manual, maybe they do with the Peavey.

The Red Box doesn't require batteries either if the desk it's connected to has phantom power.

I never knew that, not sure if Peavey does that? good tip.

[ICBM]

I never knew that, not sure if Peavey does that? good tip.

Yes, definitely. None of these boxes provide a load, the speaker connections are just 'through' in order to tap off a small signal for the emulated output. Since the speaker current doesn't *have* to go through the box, there's no reason to make it so if you don't have to.

Always keep the number of connections in the speaker circuit to the minimum, for reliability.

[MRLEON83]

Convolution is a mathematical way of combining two sounds (well, combining any kind of things that have frequency content). The basic idea is that by convolving a dry input signal with the response of an amplifier, the result is what the signal would sound like if you put it through the amp.

I think there are quite a few commercial applications that will let you do this, and if you know what you're doing you could probably write one yourself in Matlab or similar.

Oh, I meant impulse response , using a convoultion reverb plug in.....

if your using logic you can load a speaker impulse into the space desinger plug in... there are other way, just search 'cabinet impulse response'

[TheThingThatShouldNotBe]

Some pedals and racks have cab emulation modes / patches so if you run those from a line out from either the head or the power attenuator you end up with a fairly good approximation of a speaker to desk . My sans amp psa 1 has a patch for this as do a couple of my digitech pedals . you dont always need the signal from power stage of the amp , sometimes I just take the signal from the FX loop but it really depends on the emulation . I think "impulses" seems to be the most accepted method for recording purposes but for any thing else there are more simple methods for getting a cab sound minus the speaker .
Definitely would like to try out this EDI ! or learn how to make one similar