[933] Behringer GDI-21 and BDI-21

Date: April 5th, 2011 | Comments : [5] | Categories: DIY.

Behringer amp sims

I bought these two Behringer amp/cabinet simulators since they were inexpensive and I hoped they could be used for recording because I have not been totally happy with the amp sim software that I had bought. I had plans to build an amp sim but I figured for $38 each, I could not go wrong with these pedals.

The units are heavy and well constructed, and should last a long time in a studio environment. They have guitar inputs and both balanced and unbalanced line outputs that connect to other studio equipment or the sound card interface.

The BDI-21 for bass guitar has been quite useful, and it has found a home in my studio. The sound may not be a perfect match for any specific amp models but it is quite good and records well.

The GDI-21 is very similar to the bass model, and it also performs well but with some limitations. The biggest negative for me is that the unit has too much emphasis on high gain and distortion sounds and not enough clean sounds. I found the Behringer distortion to be okay but not exceptional, and too noisy at high gain settings. Most players are very discriminating about distortions sounds and like to select pedals that suit their playing style and equipment. Even so, there are some good low gain settings and I have used it in some recordings.

The bottom line is that I’m glad that I bought the units and they will find a place in my recordings, but I do plan on building my own unit to expand the options that I have available.


5 Responses to “Behringer GDI-21 and BDI-21”

[2265] InSonicBloom Says: 4:56 pm, July 17th, 2011

I would really love a “take it apart” teardown of these units!

[2315] Chad Says: 8:12 am, September 5th, 2011

I use the bass model live with my standup bass . Most sound guys insist on putting a direct box between the bass and amp .this almost NEVER works with piezo pickups and standup bass . Now I just point to the xlr and say there’s your DI . The circuit compresses just enough to make the sound guy’s job a bit easier . No idea what the input impedence is but my pick-up likes to see this more than the input on my bass amps. For 29euros it totally saved my ass

[2676] ToneGrail Says: 3:24 pm, March 7th, 2012

Is the speaker simulation active on both outputs or just the XLR?

[3571] STEVEN DALLMAN Says: 4:21 pm, November 7th, 2012

These are knockoffs of Sansamp DI’s. I have the bass DI, and the acoustic DI. At church, I use an actual Sansamp. They are virtually identical, except the Behringer won’t power off phantom power. For the bass DI, the tone controls, bass and treble, are classic Baxandall boost and cut. There is an inherent mid cut, but if you cut the bass and treble (and boost the volume) you get mid boost. The blend goes from no amp simulation/grit, (but the tone controls are still active) to a more soft, fuzzy compressed tone…like a pushed amp. Nice pedal especially for the price.

[3723] David Schwab Says: 9:01 pm, January 8th, 2013

If you want a great clean and crunch amp sim, find a used Johnson J-Station. I recently got one on eBay for $48. It sounds much better than a Pod, even though it’s not the newest technology. Their speaker simulation is patented and really sounds like a cab. The clean and crunch tones are very good, as is the higher gain sounds. And it has some nice built in effects. This is not what I use for all my recording, and I even like it better than some of the plugins I was using, like Amplitube.


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