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Fender Rumble 100 Line Out

a see, so will it be safe enough to connect two combos together with that method?
While it can be done that way, it is not the perfered method, as the output signal is weak so as not to blow out the channel on the mixing board.

The best method (this works for any two amps/combos) to input your bass signal into another amp/combo is to use the effects loop send. This is exactly the same as a pre-amp out. You just use an instrument cable to patch into another amp, of which the best way is to plug into the effects return (power amp in) of your second amp. The front end (pre-amp) provides your tone and drives the power section of your second amp. Your main amp/combo continues to opperate as normal. It does not disconnect like when you plug in headphones.

If your second amp does not have an effects loop all is not lost. Simply patch into your main instrument input jack. Keep in mind you're inputing a hot pre-amped signal. You then need to make some additional tone and volume adjustments.

And that's how it works. It's much less complex than it sounds. Very simple really.
 
Just note that any time you combine 2 amps/combos in a way that was not specifically intended, it's quite possible that the polarity may not be that same and you will lose low end in the process.
 
Just note that any time you combine 2 amps/combos in a way that was not specifically intended, it's quite possible that the polarity may not be that same and you will lose low end in the process.
The literature from Fender says the XLR line out is for a PA System or for recording equip. So I guess my question is, is a powered speaker basically the same as a PA system? Or, on the flip side, does my amp's xlr circuit function like a PA syst.?
 
The XLR direct output is not an input, so no, your combo does not act like a PA.
You should be able to connect the XLR out to the input of a powered speaker, but it may not sound good with bass.
Correct, and the polarity maybe different since there are no absolute standards followed between the two functions and pieces of equipment.
 
The XLR direct output is not an input, so no, your combo does not act like a PA.
You should be able to connect the XLR out to the input of a powered speaker, but it may not sound good with bass.
Thanks. Yes I meant can the amp's XLR out send a signal to a powered speaker just like a PA mixer. We currently use a Bose L1 system with a B2 speaker. We're a 4 piece band and we've all been sharing this one system. I just bought the Rumble 100 so I was considering options to spread out my bass without going through the Bose. We all sing and, as great as the Bose is, the vocals sometimes have a hard time competing with the bass guitar.
 
Thanks. Yes I meant can the amp's XLR out send a signal to a powered speaker just like a PA mixer. We currently use a Bose L1 system with a B2 speaker. We're a 4 piece band and we've all been sharing this one system. I just bought the Rumble 100 so I was considering options to spread out my bass without going through the Bose. We all sing and, as great as the Bose is, the vocals sometimes have a hard time competing with the bass guitar.
I think I found my answer. Blackstar makes a powered cabinet specifically for bass amps.