---
product_id: 49426340
title: "ADI-21 Acoustic Amp Modeler/ DI"
brand: "behringer"
price: "R$847"
currency: BRL
in_stock: true
reviews_count: 9
category: "Behringer"
url: https://www.desertcart.com.br/products/49426340-adi-21-acoustic-amp-modeler-di
store_origin: BR
region: Brazil
---

# Super-high impedance for pure acoustic tone Dual DI mode with XLR & TS outputs 3-band EQ with sweepable mids ADI-21 Acoustic Amp Modeler/ DI

**Brand:** behringer
**Price:** R$847
**Availability:** ✅ In Stock

## Summary

> 🎸 Elevate your acoustic sound—because your guitar deserves the spotlight!

## Quick Answers

- **What is this?** ADI-21 Acoustic Amp Modeler/ DI by behringer
- **How much does it cost?** R$847 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.br](https://www.desertcart.com.br/products/49426340-adi-21-acoustic-amp-modeler-di)

## Best For

- behringer enthusiasts

## Why This Product

- Trusted behringer brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Authentic Tube Warmth:** Proprietary tube/mic emulation circuitry delivers natural, rich acoustic presence as if miked through a vintage preamp.
- • **Pure Signal Integrity:** Super-high impedance input preserves your guitar’s dynamics and tonal nuances with zero compromise.
- • **Versatile Dual DI Output:** Switch between direct recording with emulation or classic active DI bypass mode for ultimate flexibility.
- • **Plug & Play Power Options:** Runs on 9V battery or optional PSU-SB DC supply—ready for any gig or studio session.
- • **Studio-Grade Tone Sculpting:** Ultra-musical 3-band EQ with sweepable mids lets you tame feedback and harsh piezo harmonics effortlessly.

## Overview

The Behringer ADI-21 is a compact analog modeling acoustic preamp and DI box designed to transform piezo-equipped guitars with authentic tube/mic emulation, a sweepable 3-band EQ for precise tone shaping, and dual DI outputs for versatile recording or live use. Its high-impedance input ensures maximum signal fidelity, while flexible power options and ground lift switch make it a reliable, affordable essential for professional acoustic players seeking studio-quality sound on stage or in the studio.

## Description

From the manufacturer ADI21 Acoustic Amp Modeler/Direct Recording Preamp/DI Box Analog modeling acoustic guitar preamp/stompbox with DI recording output This Behringer product has been designed to compete head to head with leading products on the market Authentic tube/microphone modeling circuitry provides the natural warmth and presence, as if your acoustic guitar was miked through a tube pre-amp Ultra-musical 3-band EQ with sweepable mids for accurate feedback control and to eliminate the harsh harmonics of piezos Dual DI mode for either direct recording output with tube/microphone emulation or standard active direct injection box in bypass mode Output available on ¼'' TS or balanced, gold-plated XLR connectors Ground lift switch eliminates typical ground loop problems Runs on 9 V battery or the Behringer PSU-SB DC power supply (not included) Super-high impedance to retain maximum signal integrity and dynamics V-TONE ACOUSTIC DRIVER DI ADI21 For an unplugged sound that’s rich, loud and electrifying, step on the V-TONE ACOUSTIC DRIVER DI ADI21. This amazing little box is essential for piezo-equipped guitars and will make your acoustic guitar sound come to life! The ADI21 combines the features of an active DI (direct injection) box with our proprietary tube/mic emulation circuitry. Enjoy a full 3-band EQ with sweepable mids and a Blend control that allows you to mix the amount of amp and mic emulation you want with your direct signal. And if you prefer the “old-school” approach, just step on the switch and the ADI21 functions as a rather superb active DI box. Great Sound, Naturally By their very nature, piezo pickups tend to be very bright, with somewhat reduced bass response and warmth. The ADI21 combines the features of an active DI (direct injection) box with our proprietary microphone/tube emulation. The BLEND control allows you to mix the amount of modeled tone with your instrument’s normal output. The resulting sound is more natural with smooth saturation, just as if your guitar were being mic’ed in the great outdoors. EQ and More… Armed with an onboard 3-band EQ, with sweepable mids to keep feedback under control, the ADI21 effectively eliminates the harsh harmonics of piezo pickups. The output is laid out on 1⁄4" TS or balanced gold-plated XLR connectors, which can be used to send a low-impedance signal to the mixing console or straight to tape. You also get a ground lift switch to eliminate annoying ground loop hum problems. You can power this little lifesaver with a 9 V battery or our PSU-SB DC power supply (not included). Sound Value Putting some acoustic glory into your recordings or live performances has never been this easy—or sounded this incredible. The ADI21 gives you a full DI, amp/microphone simulation and a 3-band EQ with sweepable mids – a lot of value in one little box! Try the V-TONE ACOUSTIC ADI21 at your local Behringer dealer and find out just how affordable great acoustic sound can be.

Review: Amazingly Good! Amazingly Cheap! Plastic Fantastic! - I had initially been looking into purchasing either a dedicated acoustic amp or an amp with an acoustic channel. I then stumbled across the Behringer range of foot pedals, and which included the V-Tone. Because of the ridiculously cheap price combined with a plastic construction, I was somewhat sceptical that it could be a worthwhile purchase. After all, this £20 device (purchase price/date £21.48/02:03:2021) is in direct competition with those costing three figure sums, and made of metal to boot, not withstanding the even more costly, dedicated amps. However, the relatively small financial outlay (and standard "returnability") made its purchase a virtual "no brainer". Experience gained from the very recent purchase of other Behringer pedals meant that I already knew the plastic construction would not be detrimental, as it is of a robust, high density, heavyweight variety. The performance didn't disappoint either. The documentation comes with some helpful settings preferences for a number of user scenarios such as "Folk", "Country" and "Finger Picking", and which can be used as time saving starting points that can then be fine tuned/customised. I found the audio results to be nothing short of stunning, but you will need the right type of amp and a piezo equipped guitar to get the best "acoustic" results. Your amp needs to be either clean or have a clean channel as this (or any other similar) pedal will, in true "silk purse" fashion, struggle, strain and ultimately fail to wrangle an acceptably authentic acoustic sound out of any "unclean" amplification. Nevertheless, there are many impressive non-acoustic sounds that can be produced by enjoyable experimentation, and you can easily get your acoustic guitar to really rock! This pedal is now happily daisychained with three other pedals (all Behringer as it happens), and are all, thankfully, audibly totally unaffected by its inclusion. One word of note. I have not tried any other alternative pedals, but if one produces results any better than the V-Tone, not only would I be truly amazed, but paying two, three, four, five times the price might just be worth its metal! Addendum: Since writing the above review (which was within hours of receiving the V-Tone) I have discovered a couple of noteworthy points, the first of which might already be common knowledge to more experienced users. 1. If powering by battery, when not in use, never leave a jack plug in the "In" socket because whether or not the pedal is in the "on" depressed position, your battery will be drained "flat"! There is reference to this in the accompanying documentation, but didn't notice. Consequently, having set up and put aside a new four-pedal chain, replete with fresh batteries, I later discovered, on its next outing, that all but the first pedal was "dead" (first pedal had guitar jack plug removed). 2. When removing V-Tone from the velcro covered pedalboard (so as to access the underside battery compartment), the pedal's rubber base started to become detached, and so will have to be reglued. Closer inspection indicated that it had not been particularly well secured, but is a problem that cannot affect my other three pedals as their design doesn't incorporate an additional "base" material! Should really deduct a star, but am so pleased with the sound and general functionality that it seems a bit churlish. Any additional problems, though, and there might be star carnage!
Review: Very good, with a few limitations - First, this is far better than it has any right to be, bearing in mind the exceptionally low price. Second, it does not perform as well as a Fishman Aura Spectrum pedal, but then, at this price that is hardly surprising. What it does do, and does well, is provide a basic DI for both active and passive piezo transducers, and adds in some useful EQ options, and a kind of 'imaging blend' effect. This certainly helps to tame 'piezo quack' and is quite usable in moderation. It does have a couple of drawbacks. The EQ is somewhat 'rough and ready' compared to the EQ on more upmarket boxes, the residual self noise is higher than you would find in a top class DI of this kind, and the 'blend' control is only natural up to a point.... use too much, and it becomes quite muddy. Those drawbacks aside, used carefully it can sound perfectly OK. The overall construction quality feels solid enough, and the jacks and XLR appear to be of decent quality. I purchased this for a friend and was able to do a straight A-B comparison with my own Aura Spectrum pedal. Considering that this is almost 10X cheaper, it really fared pretty well and honestly, nothing really to complain about at all. If you listen critically, yes, there is a difference, but on stage, the Behringer sounds totally acceptable. My final comment: incredible value and more than good enough for most stage applications.

## Features

- Analog modeling acoustic guitar preamp/stompbox with di recording output
- Ultra-musical 3-band eq with sweepable mids for accurate feedback control and to eliminate the harsh harmonics of piezos
- Super-high impedance to retain maximum signal integrity and dynamics
- Authentic tube/microphone modeling circuitry provides the natural warmth and presence as if your acoustic guitar was miked through a tube pre-amp
- Dual di mode for either direct recording output with tube/microphone emulation or standard active direct injection box in bypass mode

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000KITQK2 |
| Batteries | 1 9V batteries required. |
| Best Sellers Rank | 26,909 in Musical Instruments & DJ ( See Top 100 in Musical Instruments & DJ ) 11 in Guitar Preamps |
| Colour | multi |
| Colour Screen | No |
| Country Produced In | china |
| Customer Reviews | 4.0 4.0 out of 5 stars (956) |
| Date First Available | 14 Dec. 2006 |
| Item Weight | 458 g |
| Item model number | ADI21 |
| Product Dimensions | 5 x 10.01 x 12.7 cm; 458.13 g |
| Styling | Tube |
| Voltage | 9 |

## Images

![ADI-21 Acoustic Amp Modeler/ DI - Image 1](https://m.media-amazon.com/images/I/81vnI4pxcFL.jpg)

## Questions & Answers

**Q: What is the correct psu values for this? I have a 9V 500ma supply will that work?**
A: 9v power supply will do the trick. The unit draws only 25-35 milliamps so your supply will be big enough. I think it needs to be centre positive. If you plug in and it doesn't work you might have to cut the wires on the power supply and rejoin them back to front. A regular 9v battery should last you around 10-12 hours with continuous use.

**Q: Does anyone use this with a tube amp?**
A: I use mine with a Marshall acoustic amp and it is a good preamp and eq  for electro/ acc guitars

**Q: I have a Taylor with magnetic pickup going through a Fishman Loudbox Mini. I need more volume without feedback. Will this work?**
A: It will provide more volume and can be adjusted for EQ, so you should be able to roll back any frequency that is feeding back. I do find the sound becomes quite middle-y and a little bit muddy (like you get with tube compression), the more you try to raise the volume. There is a blend control to mix the natural sound of the guitar with the "processed" sound of the behringer, but to maximise volume you have to set this to full on to processed sound. The sound is a matter of taste, I only use this device when playing solo's to give me a lift, but do find the guitar ends up sounding more like an electric guitar (humbucker/neck position'ish). Hope this helps.

**Q: What voltage and current does the PSU give out for this/ what voltage and current does this unit need?**
A: The unit uses a 9v power supply (either battery or adapter)It gives a balanced line output (XLR cable)Works well :-)Robert

## Customer Reviews

### ⭐⭐⭐⭐⭐ Amazingly Good! Amazingly Cheap! Plastic Fantastic!
*by J***K on 10 March 2021*

I had initially been looking into purchasing either a dedicated acoustic amp or an amp with an acoustic channel. I then stumbled across the Behringer range of foot pedals, and which included the V-Tone. Because of the ridiculously cheap price combined with a plastic construction, I was somewhat sceptical that it could be a worthwhile purchase. After all, this £20 device (purchase price/date £21.48/02:03:2021) is in direct competition with those costing three figure sums, and made of metal to boot, not withstanding the even more costly, dedicated amps. However, the relatively small financial outlay (and standard "returnability") made its purchase a virtual "no brainer". Experience gained from the very recent purchase of other Behringer pedals meant that I already knew the plastic construction would not be detrimental, as it is of a robust, high density, heavyweight variety. The performance didn't disappoint either. The documentation comes with some helpful settings preferences for a number of user scenarios such as "Folk", "Country" and "Finger Picking", and which can be used as time saving starting points that can then be fine tuned/customised. I found the audio results to be nothing short of stunning, but you will need the right type of amp and a piezo equipped guitar to get the best "acoustic" results. Your amp needs to be either clean or have a clean channel as this (or any other similar) pedal will, in true "silk purse" fashion, struggle, strain and ultimately fail to wrangle an acceptably authentic acoustic sound out of any "unclean" amplification. Nevertheless, there are many impressive non-acoustic sounds that can be produced by enjoyable experimentation, and you can easily get your acoustic guitar to really rock! This pedal is now happily daisychained with three other pedals (all Behringer as it happens), and are all, thankfully, audibly totally unaffected by its inclusion. One word of note. I have not tried any other alternative pedals, but if one produces results any better than the V-Tone, not only would I be truly amazed, but paying two, three, four, five times the price might just be worth its metal! Addendum: Since writing the above review (which was within hours of receiving the V-Tone) I have discovered a couple of noteworthy points, the first of which might already be common knowledge to more experienced users. 1. If powering by battery, when not in use, never leave a jack plug in the "In" socket because whether or not the pedal is in the "on" depressed position, your battery will be drained "flat"! There is reference to this in the accompanying documentation, but didn't notice. Consequently, having set up and put aside a new four-pedal chain, replete with fresh batteries, I later discovered, on its next outing, that all but the first pedal was "dead" (first pedal had guitar jack plug removed). 2. When removing V-Tone from the velcro covered pedalboard (so as to access the underside battery compartment), the pedal's rubber base started to become detached, and so will have to be reglued. Closer inspection indicated that it had not been particularly well secured, but is a problem that cannot affect my other three pedals as their design doesn't incorporate an additional "base" material! Should really deduct a star, but am so pleased with the sound and general functionality that it seems a bit churlish. Any additional problems, though, and there might be star carnage!

### ⭐⭐⭐⭐ Very good, with a few limitations
*by A***D on 4 August 2012*

First, this is far better than it has any right to be, bearing in mind the exceptionally low price. Second, it does not perform as well as a Fishman Aura Spectrum pedal, but then, at this price that is hardly surprising. What it does do, and does well, is provide a basic DI for both active and passive piezo transducers, and adds in some useful EQ options, and a kind of 'imaging blend' effect. This certainly helps to tame 'piezo quack' and is quite usable in moderation. It does have a couple of drawbacks. The EQ is somewhat 'rough and ready' compared to the EQ on more upmarket boxes, the residual self noise is higher than you would find in a top class DI of this kind, and the 'blend' control is only natural up to a point.... use too much, and it becomes quite muddy. Those drawbacks aside, used carefully it can sound perfectly OK. The overall construction quality feels solid enough, and the jacks and XLR appear to be of decent quality. I purchased this for a friend and was able to do a straight A-B comparison with my own Aura Spectrum pedal. Considering that this is almost 10X cheaper, it really fared pretty well and honestly, nothing really to complain about at all. If you listen critically, yes, there is a difference, but on stage, the Behringer sounds totally acceptable. My final comment: incredible value and more than good enough for most stage applications.

### ⭐⭐⭐⭐⭐ Excellent value and a great product
*by F***M on 20 November 2013*

I play mandolin and banjo in a bluegrass band and I recently bought piezo pickups for both instruments. Plugging them straight into the amp produced a sound akin to a tin can on both instruments, so I asked advise and was told that I really should get a preamp to match the output signal from the piezos and the amp requirements. I didn't want to spend a huge amount so did some investigation and the reviews for this product were pretty good and I decided to give it a go. Ordered it from Amazon. Arrived next day and I plugged it straight into my practice amp to try it out on both instruments. First of all, I was impressed with the build quality. This is a heavy box, well made and won't break easily. The controls are easy to use and give a large spectrum of adjustment, so you can really get whatever tone you want. There is also an on/off stomp button. Useful for tuning, switiching instruments, etc. OK, no banjo is going to sound great on a piezo, but this box doe go some way to giving you a decent tone. On the mandolin, it sounds spot on. The other great feature is that there is a balanced XLR output so you can go into the XLR channel on your amp, which will also help with signal integrity. If you don't have XLR, there is te usual jack output so no worries either way. I used it during our latest gig and it really made a huge difference. There are man other preamp/DI boxes out thee that cost a lot more, but frankly, I don't think they'll do that much of a better job than this one for the extra cash involved. Only time will tell re longevity, but it does look and feel like it'll outlast a lot of more expensive boxes I've used in the past. Highly recommended.

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*Product available on Desertcart Brazil*
*Store origin: BR*
*Last updated: 2026-02-01*