What is the correct psu values for this? I have a 9V 500ma supply will that work?

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.

Does anyone use this with a tube amp?

I use mine with a Marshall acoustic amp and it is a good preamp and eq for electro/ acc guitars

I have a Taylor with magnetic pickup going through a Fishman Loudbox Mini. I need more volume without feedback. Will this work?

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.

What voltage and current does the PSU give out for this/ what voltage and current does this unit need?

The unit uses a 9v power supply (either battery or adapter)It gives a balanced line output (XLR cable)Works well :-)Robert

Behringer Adi 21 Acoustic Amp Modeler Di

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Description

🎸 Elevate your acoustic tone — be the player everyone envies on stage and in studio!

AUTHENTIC TUBE WARMTH - Tube/microphone modeling circuitry delivers rich, natural warmth as if miked through a vintage tube preamp.
COMPACT STAGE READY - Lightweight and pedalboard-friendly design ensures you never compromise tone or portability on the go.
PURE SIGNAL INTEGRITY - Super-high impedance input preserves every nuance and dynamic of your acoustic guitar’s natural voice.
PRECISION TONE SCULPTING - Ultra-musical 3-band EQ with sweepable mids lets you tame feedback and harsh piezo harmonics effortlessly.
VERSATILE RECORDING READY - Dual DI mode offers seamless switching between direct recording with tube emulation or standard active DI bypass.

The Behringer ADI-21 is a compact analog modeling preamp and DI box designed for acoustic guitarists seeking professional-grade tone shaping and recording flexibility. Featuring a 3-band EQ with sweepable mids, super-high impedance input, and authentic tube/mic emulation circuitry, it preserves your instrument’s natural dynamics while adding warmth and presence. Dual DI modes allow direct recording with tube emulation or standard DI bypass, making it a versatile tool for live and studio use.

Specifications

ASIN	B000KITQK2
Batteries	1 9V batteries required.
Best Sellers Rank	8,541 in Musical Instruments & DJ ( See Top 100 in Musical Instruments & DJ ) 1 in Acoustic Guitar Preamps
Colour	multi
Colour Screen	No
Country Produced In	china
Customer Reviews	4.2 4.2 out of 5 stars (974)
Date First Available	14 Dec. 2006
Guaranteed software updates until	unknown
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

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