Hissing & Static Noise...

[mosquito neck]

I just got two used boss pedals off ebay a CE-5 , and BF-2. Both make a hissing/Static noise when i play them through my bass. When i play them on a guitar they play fine no hissing or static.I also have a
Boss RC-2 but it doesn't hiss at all when i play bass or guitar through it.
The only difference with these is the RC-2 runs on a 9v battery, and i have power supplies for the BF-2/CE-5. Do you think that is the problem i should just try a actual battery?

[loopmantra]

is it regulated power supply?
is it korean made boss? they tend to hiss...
check the cables also
and,honestly,boss chorus are known to be a bit hissy,maybe you should trade it and buy something else..

[Hyssar]

Try the new pedals with batteries before doing anything else.
Actually, you should have done that before posting this thread