i have a crappy old guitar amp combo, and the speaker is shot. i was wondering if it was possible to connect a pre-amp to a speaker. i would remove the box that the all the knobs and inputs are on, and the speaker from the old guitar combo. i would buy a pre-amp, and a speaker byitself. so, is this possible, or is it a no-go? if i were to buy these two things: http://www.musiciansfriend.com/srs7/g=bass/search/detail/base_pid/485025/ and http://www.musiciansfriend.com/srs7/g=live/s=accessories/search/detail/base_pid/667712/ would it be possible to connect them? any feedback at all would be appreciated.