Friday, 22 January 2016

MultiCab Simulator

Here is a very nice project by Dschwartz from the DIY Forum.
You can find the original thread here




27 comments:

  1. Wow, cool stuff and super interesting thread. I think i'll give it a try next couple of days. Best thing is, that this will cost almost nothing, cause I got every part on stock.
    But I think I'll try a diffrent OP-amps and transistor.
    Thanks for posting!

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  2. Any chance you post the Bass version missing from the site? Thank you very much. Great work!

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  3. Sorry but I don't have the bass version.

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  4. I built this last night. It is verified except the Top pot is reversed. I have been playing it all morning with my Pinnacle (high gain Marshall) pedal into my recording mixer and through my studio monitors. This is really a nice cabinet sim. Unlike most it has a ton of gain. The Flatness control really makes it come alive. I will label this control Focus on my build instead.

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  5. Is there anything stopping me putting this at the end of my effects chain and then into a clean valve amp?

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  7. Is the tonecontrol (b.,m,t) working passiv? Or does it boost too?

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    1. Yes it is active and capable of boosting/cutting bandwidths, but don't think of it as a tone control. It is a set of interactive filters designed to duplicate the EQ curves imparted by various speaker cabinets. It also will give you the impression of a microphone being swept around on the speaker so you can find a "sweet spot" for each signal.

      If you want something for the end of your signal chain going into an amp, try the tonemender or the Anderton super tone control builds on this site. You will be very happy with either of those.

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  8. Thank for the recommendations Al. I'll have a look for them for sure

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  9. Can anyone explain what the different pots do in layman' terms? Are the just treble mid bass and volume? Or is there on that corresponds to mic placement, one to can type, etc. If the former, does anyone have suggested settings for a Marshall 4x12, for instance, or a fendery 1x12. My ears aren't the best trained to pick out those speaker freq curves but I know them when I hear them. Dialing in is always hard for me tho. I'll be playing straight off my pedal board into a mixing board then a headphone amp.

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  10. Well, I can take a stab at it.

    The gain control is your level. The main action comes from the Flat control. The Top and Bottom are narrow filters that are interactive to a degree with the flat knob. In use, I can not say "to get a certain cabinet you need this setting". I can say you will transform a brittle sterile distortion tone into something much more usable and recordable. As far as copping exact cabinet details like a 1992 mesa 4-12 or a vintage Marshall cab I do not approach this build in that manner. Though I have used many many cabs in my years I do not hear any identifiable nuance to say it sounds like this or that. I can say it sounds very good! This sim will bring an edge and definition and punch to your tone.

    Start off by setting your distortion's output level so that it does not distort the cab sim's input. Just crank it up and listen you will hear the spot where it happens. Stay well below that level. Now, set the Gain on the cab sim to 9 o'clock (unity) and the Top and Bottom at 12 noon Flat at 0. Have someone play your rig so you can twiddle and start by cracking open the Flat control until you hear the sound start to come alive or open up. Stop there and tweak the Top and Bottom controls to fine tune what you have. Take your time and use the Flat control to get in the ballpark where you want to be. That is the control that sounds much like sweeping a live mic around on the speaker to find a sweet spot.

    Best results come not from listening to the guitar tone all on it's own, but with the guitar sound in the mix where you can really define a position within the other instruments.

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    1. Thanks Al. Great info.

      I'd love if this thing had a stereo headphone amp. I found one out there but was kinda complicated to build so just going to run it through my mixing board fir now.

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  11. Hello Alex, is there any difference between this Multicab sim and the one posted here? http://www.aerhalev.net/alex/multicabsim_final.jpg - I was building the old one and now i dont know if is worth to finnish it. Any help please :)

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  12. Hi Niab.
    It's the same circuit.

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  13. Excellent! Thanks a lot Alex, i thought the different amount of caps would affect the result.
    Cheers

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  15. I used jrc072. But it's not working. Just high pitched squeals that change when I turn knobs. Voltages as follows:

    C 5.3
    B 0.8
    E 0

    Pins
    1 7.5
    2 1.8
    3 3.9
    4 0
    5 1.8
    6 1.8
    7 1.8
    8 7.9

    Any help would be greatly appreciated.

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  16. ANybody? If you could just post what the proper voltages are, that would be helpful too. Then maybe I could figure out where things are going wrong. Thanks.

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    1. Hy Bryan!
      I haven't built it but first thing I've notice Pin 8 should be 9V and pins 1&2 should have the same voltages cause they are linked together.

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    2. Thanks Alex. Figured it out. I missed a cap. D'oh!! The thing sounds great. Couldn't be happier. Making two in fact.

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    3. I'm glad it was an easy fix!

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  17. Question - there are small red caps marked as 220n and 100n - but they appear in the diagram like they should have been labeled 220p and 100p (based on how they look); so, are they "n" or "p"?

    I built this using P for these parts, and I have less than unity gain, so I am guess it is the other way around. I am just curious why they were made to look like pF caps if the are really nF?

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    1. Hi Paul.
      All my layouts are the same.
      If the yellow caps span just 2 rows instead of 3 you can't read the values.
      That's why I use red caps in that case.
      Just for practical reasons.
      The values are the important part, not the color of the caps.

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  18. I'm looking for a cab sim more prone to cleaner sounds- or cranked fender sounds (i'm gonna use a few amp in box pedals, but nothing high gain) along with my damage control tube preamp. I read that this distorts on its own... is that correct? do you guys think that I can dial in some good sounds for typical blackface style cabs? or is it all celestions and whatnot? Thanks!

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