Donner DP-2 Power Supply Review: Budget-Friendly or Just Trouble?

The Donner DP-2 power supply has been making waves as one of the most affordable multi-output options on the market. But is it really a reliable choice for your pedalboard, or does the low price come with high risks? Let’s break it down.

Marcelo Dominguez

4/6/20252 min read

Tech Specs

– What Does the Donner DP-2 Offer?

The Donner DP-2 features 10 supposedly isolated outputs:

  • Outputs 1 to 6: 9V DC, 100mA each

  • Outputs 7 & 8: 9V DC, 500mA each

  • Output 9: 12V DC, 500mA

  • Output 10: 18V DC, 500mA

It comes with an included 18V adapter, which theoretically should provide more headroom than a standard 9V one.

Real-World Test – 10 Pedals, One Power Supply

We tested the Donner DP-2 with ten pedals, including:

Pedals were connected according to their voltage and current requirements.

Issues Detected – Noise, Whines & Interference

Once powered up, we immediately noticed:

  • A high-pitched whine (even without touching the guitar)

  • Minor interference noises when engaging multiple pedals

  • Unstable behavior: one pedal (the Canyon) turned on by itself and blinked erratically

Even though the outputs are labeled “isolated,” these noise issues suggest otherwise. True isolation should eliminate such interference—especially with high-draw digital pedals like reverb and delay.

Sound Quality – No Headroom Benefit

We expected increased headroom from the 12V and 18V outputs. However:

  • No noticeable tone improvement at 18V (compared to other units)

  • No gain in clarity or dynamics, especially for compressors or overdrives

  • Compared to the One Spot Truetone CS12 or CS7, the DP-2 falls short

Final Thoughts – Not Worth the Trouble

While the price is attractive, the Donner DP-2 did not deliver reliable performance in our tests. Compared to a One Spot Truetone daisy chain, we saw similar or even worse results with the Donner DP-2. And that’s disappointing.

Our Verdict: Skip it. Unless Donner improves isolation and consistency, this power brick creates more problems than it solves.

Better Alternatives?

Yes! Check out our full review of the Caline CP-207, another affordable power supply that performs significantly better under stress.

Watch the Full Video

YouTube: Donner DP-2 Review


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