Is a guitar EQ pedal enough to cut out low frequencies to play guitar amp?

I would think you would need an EQ that goes lower preferably all down to 30Hz or something like that like a bass EQ pedal, or even better a High Pass Filter.

When that is said as I understand it most guitar amps will cut out the lows by them self anyway, and the result will be that your bass just will sound quite treblely and upper mid rangy, more like a guitar tone wise.

At low volumes you should be safe though no matter what.

 

Get the new MXR 10 band EQ. You can use it on anything and it goes down to 30hz.

 

It all depends on what volumes you're talking about and the speakers you're goiing through. At low to moderate volumes, a lot of guitar combo amps can be used very effectively with a bass as long as the speakers can handle the lows. You can always look up the specs on your speakers and just cut the frequencies running below their bottom range if you're worried about blowing something. An HPF is probably your best bet to accomplish that.

 

Rolls Corporation - Real Sound - Products SX21 Tiny Two-Way Crossover

This works for me, I use a clean bass stack and dirty tube guitar stack on occasion

 

Is the 100hz on your pedal not a shelf and instead a narrow band?

I have a 20 dollar behringer bass eq and just use it chop the ultra low and high frequencies that we either can't hear or I know my amp can't reproduce.