Just picked up the Broughton HPF and I need to get a wall wart to power it to avoid cannibalizing one from my other pedals. It seems very flexible in that it can utilize 9-24v power supplies. That flexibility actually making my decision more difficult. From the website: The High Pass Filter requires a DC power supply (not included). The DC supply should be a standard Boss style connector, center negative polarity. It can accept 9 to 24 volts. Higher voltages will provide more clean headroom. Any recommendations of model(s) of higher voltage to use? With some other pedals I've been using a couple of the Trutone 1 spot, which have worked fine. (I'm using one power supply per pedal, not daisy chaining). I can just pick another of those up. But if a higher voltage model would serve me better than I'm open to getting the right unit from the get go. At the same time, I'd rather not have to spend another 50% of the cost of the actual pedal on a power supply for it.