powering the H9 with Voodoo Pedal Power 2+

We can only recommend our supplied power supplies. You should contact Voodoo and ask them what they think.

The H9 requires 9VDC @ min 500ma to run, so it doesn't look like that power supply will do it. It will also work with 12VDC @ 400ma (it's been stated on this forum several times, and I believe the PowerFactor runs at 12V).

Correct PowerFactor runs pedals at 12v DC 

It doesn't work with my PP2+.

I bought a Iso5, Voodoo Lab website mentionned that i works, I'll tell you.

I couldn't make it work reliably with mine. Back to the supplied power supply. 

Is it better to use 12V or 9V? Some pedals work better with 12 V. Is there a difference for h9?

H9 will work with either. It uses less current on 12V.

But, please note the following:

1) Any damage caused by unapproved power supplies will not be covered by warranty.

2) A 12V supply must be regulated. An unregulated supply may put out a higher voltage that can cause damage.

It works on my Voodoo Lab Iso5, 12vdc output (300mA) with 2.5mm Reverse Polarity (Center Positive) Barrel Cable.