cabsims... and even more cabsims

Stompboxes circuits published in magazines, books or on DIY electronics websites.

Re: cabsims... and even more cabsims

Postby caspercody » 27 Feb 2018, 18:34

Thanks BMXGUITARSBMX.

Something like this:
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Re: cabsims... and even more cabsims

Postby temol » 27 Feb 2018, 20:08

caspercody wrote:Did your KMG V30 cab sim have a issue of being below unity volume? My build is slightly lower then unity volume, and I would love to get it up (volume that is). I tried increasing the voltage to 18vdc and 32vdc, but this had no improvements on volume.


Sorry, cannot help you with this. I've breadborded V30 cabsim, but I focused on the sound only, not the volume levels. There was a difference in the signal levels between the cabsims. But I only adjusted input level of the audio interface to compensate for this.
Also, when I breadboard the circiut, I usually do not use any bypass switch.

T.
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Re: cabsims... and even more cabsims

Postby caspercody » 27 Feb 2018, 20:30

Thanks Temol

In your opinion, which cab sim was the best sounding, or more cab like to you?
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Re: cabsims... and even more cabsims

Postby temol » 27 Feb 2018, 20:50

Heh.. tough question. I'd list three or four cabsims I liked most. LS14, Lart (the one from my second batch of cabsims, not the simple cabsim), 4x12 Celestion Vintage 30 (TrueVAL), I also like multicab speaker sim by DSM (because of possible adjustments).
Someone on the Russian forum mentioned about oscillation problems with Lart's cabsim (the one I have mentioned I like). I have not had any problems with the circuit on a breadboard. But now, when built on a pcb, it squeals sometimes, mainly when powered on.

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Re: cabsims... and even more cabsims

Postby caspercody » 27 Feb 2018, 22:02

Thanks!!
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Re: cabsims... and even more cabsims

Postby temol » 23 Apr 2018, 21:03

I'm back with six new circuits.
Setup same as previously.

Let's go

File on a Soundcloud.

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sample #1 - no cabsim

sample #2 - LS10 by Lionsound.

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sample #3 - 4x12 cabinet simulator by TrueVAL (ver 7.0.2012). One knob - Low boost.

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sample #4 and #5 - speakersim from MARcus NRG 2400 v3.0. Two graphs, one is from a "normal" cabsim, second graph - there is another filter (opamp) that cuts around 600kHz.

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sample #6 and #7 - BAJA CV30M1960A Speaker Simulator pedal. Quote from the author "speaker cabinet simulator based on the response characteristics of the Marshall 1960A quad box loaded with Celestion vintage 30 loudspeakers. In addition I have included the response characteristic of a typical tube output stage, output transformer reactive loading stage with the cabinet response - this can be switched in or out for comparison"

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sample #8 and #9 - Blackstar HT5 Speaker emulated out (posted by J0K3RX). It's possible to switch between 1x12 and 4x12 cab.

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sample # 10, #11 and #12 - dr Caligari by TrueVAL. . Three knobs - Hi sweep, Low sweep, Damping. #10 - all knobs @ min, #11 all knobs @ max, #12 mixed positions. For dr Caligari I have recorded few more samples. You can hear how the sweep control works. File on Soundcloud .
#1 - Hi sweep
#2 - Low sweep
#3 - Damping sweep
#4 - Low @ max, Damping sweep
#5 - Damping @ max, low sweep
#6 - Hi & Damping @ max, Low sweep

Image


T.

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Re: cabsims... and even more cabsims

Postby temol » 26 Apr 2018, 23:28

Here's another cabsim - different version of dr Caligari, with 16 opamps. Slightly different frequency response.

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This is the only new cabsim I have now, so I took three previously tested cabsims, just for comparison.

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File on Soundcloud

#1 - no cab
#2 to #7 - dr Caligari with different settings of Hi and Low sweep potentiometers.
#8 - 4x12 Celestion Vintage 30
#9 - LS14
#10 - Lart 2.

T.

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Re: cabsims... and even more cabsims

Postby temol » 28 Apr 2018, 13:35

Here's the updated frequency response for dr Caligari cabsim. It turned out that I had to rebuild the breadboard (problem with HF filters)

Image

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Re: cabsims... and even more cabsims

Postby J0K3RX » 28 Apr 2018, 17:54

The Dr. Caligari sounds good to me, has a good range of EQ shaping possibilities that all sound usable.

Check out this link, has allot of very useful information and acoustic simulation tools like floor & wall reflection simulators, room simulator, speaker directivity simulators etc... Could be useful is adding options to these cab sims like on/off axis mic, open/closed back cab, cab size etc..
http://www.tonestack.net/index.html#

This link has some really interesting/good information also.
https://troygrady.com/2014/02/04/hail-t ... 2-cabinet/

For me I like a 4x12 cab loaded with 2 - Celestion V30 or G12M Greenbacks and 2 - G12H-75 Creambacks in a diagonal configuration.

I like 2x12 cab loaded with the same as above but with only one of each, obviously..

To my ears it's just a wider sound with allot of harmonic presence...

Maybe BAJA's Celestion Blue and his CV30M with a mix/blend pot.. :hmmm:

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Re: cabsims... and even more cabsims

Postby temol » 04 May 2018, 16:30

This time only four circuits, although much more samples.
Setup as usual.
File on Soundcloud

Image

sample #1 - no cabsim

sample #2 - Marshall LXH. I have two schematics for this cabsim. One from Hexeguitar website, the other one - from original LXH website (website is down, but there is always Wayback Machine). Schematics differ slightly. Not sure which one is "correct". I've recorded only one version (Hexeguitar), although I attach two frequency response plots.

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sample #3 to #5 - dr Caligari 4x4 (16 opamps). I re-recorded this one because of the issues with previous layout. #3 - low & hi set to min, #4 - low & hi set to max and #5 - mixed settings, and backed off damping knob a little bit.

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sample #6 to #13 - ADA Varicab. Three switches - two for the cab size and one for dark/bright. It supposedly emulates 2x10, 1x12, 2x12, 4x12 cabs.

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sample #14 - Hyperbolic cabinet simulator. This one has some issues with interfering delay lines. It's not easy to find setting of the "dimension" knobs that does not produce a whistle in the background

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Only four cabsims but loads of troubleshooting the breadboard layouts... very easy to make a mistake or a short circuit but not easy to spot it. Marshall - I've completly rebuilt the circuit three times, caligari - two times.
Here you can see two simulators. Upper half - dr Caligari, lower half - Marshall.

IMG_8864.JPG


T.
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HENK (05 May 2018, 11:20), sixthfloor (05 May 2018, 09:51)
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