Winterland wrote:I was asked to play bass but only have my jerry cabinet/rig. SMS>Rocktron 300>2JBL's E120..Can I use this to play bass through?
I appreciate any input.
You can try, but if it's an open back cabinet and you play beyond quiet practice level, you'll probably blow the speakers. Bass creates a pretty long excursion, especially for the low notes. So, the speakers rely on some sort of resistance from the air within the cabinet, whether it's sealed and creates a lot of resistance, or ported and creates resistance at certain frequencies. An open back cabinet provides no resistance and it will be very easy to go into over-excursion, resulting in dead speakers.
If the cabinet is sealed, go for it. Just don't expect a thundering low end. I've got K and E 120s in some small Thiele cabs and play bass through them, but the low end is nothing like a "real" bass cabinet.