Harley Benton PowerPlant ISO-12 Pro

Multi power supply for effect pedals

  • 12 Isolated, filtered & short-circuit-protected outputs eliminate noise and hum
  • High-amperage for modern digital effects
  • LED monitoring at each output
  • Power supply with a 12V @ 3A DC power supply (included)
  • Output 1-9: 9V DC @ max. 300 mA (individually isolated)
  • Output A-B-C: 9/12/18V DC @ max. 500 mA (individually isolated)
  • The total output load must not exceed 27 W
  • Dimensions (W x D x H): 192 x 70 x 30 mm
  • Weight: 356 g
  • Included cables: 12 Pieces from 5.5 x 2.1 mm coaxial plug to 5.5 x 2.1 mm coaxial plug, length 60 cm each

Further Information

DC/AC current DC
Output current in mA 3000 mA
9 V Yes
12 V Yes
18 V Yes
Secondary voltage No
Multi-output power supply Yes

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188 Customer Ratings
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quality
Problem-free power brick
RichardBR, 08.11.2020
I have a few power bricks for guitar pedal boards, One-Spot CS-7, Tone City Substation, as well as smaller power devices such as the 1-Spot daisychain. I've had quality devices, such as the CS-7, and not so perfect things like the Substation, which is quite noisy.

Thomann's Harley Benton PowerPlant ISO-12 sits comfortably with the One-Spot CS-7 in that "zero noise/plenty of options/good overall power rating" category - but at about half the price! It's also a great deal less bulky, which allows it to fit below even small pedalboards with ease.

All the power cables are supplied, and with 12 outlets that is a lot of cables. The ratings of individual outputs also permits some degree of daisychaining since there is enough juice for at least a couple of pedals per output unless they're digital monster-pedals. You'll need to find your own daisychain cables though, if you go that route. With 12 outputs it is unlikely you'll need to daisychain anyway.

Three outputs are switchable voltages, 9/12/18, 9 for typical pedals, 12v for things like Boss pedals, and 18v for anything that can handle it, such as my Xotic SL Drive Red, which gains a lot of headroom when it runs at 18v. Outputs can be combined with a suitable 3rd party splitter cable used to join the two outputs and feed the current to the pedal.

For me, using this on a pedalboard with mixed CPU pedals (Empress Echosystem) and normal cuircuit pedals, everything plays nicely together with no extraneous noise, every bit as good as my 1-Spot CS7. I'm very happy with the unit so far, and a friend tested the isolation aspect and gave it the thumbs up with regard to the isolation, since some power supplies, including some older Harley Benton models, are basically just daisy-chains in a box.

I like the simplicity of use, and also the separate transformer/plug, I like the LED indicators that would highlight circult probems nd, with the transformer elsewhere, the slim profile works very well on low-profile boards.

It's a winner.
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Total
quality
Amazing value! highly recommend
RossJ, 08.02.2021
I needed a decent power supply for 10+ pedals and since daisy chaining was creating a lot of noise I needed an isolated power supply. Only problem was most on the market were either £200 or cheap Chinese ones that looked like they might blow up. I was dubious when I first ordered this given how reasonable the price was but positive reviews settled my worries till it arrived.

Firstly upon arrival I was pleasantly surprised by how well packaged it was. I've ordered guitar equipment double it's price that's arrived in a cheap and battered box but this was very well packaged with all the bit and pieces I'd ever need. I quickly plugged it in to test it out and was blown away by the silence. I'm running 11 pedals, most of which are overdrives and distortion which are nightmares for any one who seeks a quite amp tone yet this delivered.

The build quality is great and the slim profile is a great bonus, its almost half the size of my previous power brick. My only complaint is the power cable to the wall isn't very long but that's more my problem as I need an unnecessarily long cable, it's not shorter than the other power supply cables I've had so I won't knock it down for it.

All in all amazing value for money and I'd wager it would put up a fight against the £200+ heavyweights in the psu market.
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quality
Best for the price
ivoi.iovi , 30.10.2020
I was having trouble finding an isolated power supply which would provide adequate amperage over all outputs and was actually affordable, then I saw this one and it hit the spot perfectly! Most of my pedals (and most basic effects) have very low draw, but my GCA Plasma Pedal needed 300mA whilst a couple of effects I am considering need up to 500. A lot of others in this price and above, with this many outputs, work on splitting the available amps or have only around 150mA max. This block provides up to 300mA for EACH 9v output, and 500 on the switchable outputs; Perfect!

I'm sure there are better ones out there but honestly all I would prefer is a stronger power cable (as with the larger AC unit that Thomann offer), although the one with this supply should be fine if not seriously abused.

This powers all I need, the isolated outputs seem totally noise free, and the shallow profile allows mounting even under flat pedalboards.
Great stuff and a great price!
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tremendous value for money
krisvad, 08.12.2020
Got the HB ISO-12 as my board had grown beyong my two other power supplies and rather than getting an additional smaller supply this one with 12 outputs three of which can run up to 18V is perfect. Having isolated outputs mean I have not experienced any additional noise compared to an all-battery-powered board. The size is perfect for mounting under my board and it is light enough to only require a bit of pedal board tape to fit. I do not know how well it will endure with plugs being unplugged often, but my board is relatively static and I have another 3 power supplies if I want to test things out. Therefore mine will most likely not have the leads unplugged often. The only slight downside is that all the leads that come with the supply are the same length meaning some run excessively long and have to be zip-tied to keep things neat. I recommend this product wholeheartedly. Are there better products available? Probably. Are there any which suit my need and my wallet as well? I doubt it.
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$99
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