D
Thanks, @GregT . And thanks @G-Dog for the reminder about the fixed volume level of the FX Send on the Studio 40. So, basically, I should set the Gain on the slaved 40 combo to its minimum (fully CCW, or anticlockwise; six to some, half a dozen to othersYeah, Maarti, Greg's quite right, it is safe to run a Rumble's FX Send to another Rumble's Instrument Input. However, you will need to reduce the Gain of the second amp to keep from overdriving the signal, along with any other EQ adjustments for taste. Plus, as Greg says, it allows different volumes and EQs on the two amps! Way to go there, Greg!!
In fact, for those FX Sends, that's the main way you should do it to reinforce the sound, unless you use the XLR Outs. Unlike the non-modeling Rumbles, the Stage & Studio FX Sends have a fixed level unaffected by the Master volume control!
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Too bad I can't get a 40 combo with black grille cloth. Oh, well. At least it's a way to get a 2x10 without having 500 watts blow out my neighbors.


EDIT: Thomann is backordered several months on the 40 combo. Time to let the G.A.S. subside a bit. But the 90 cm Fender patch cable with 90 degree plugs to connect my Studio 40 to my non-existant 40 combo is available. First, there were air guitars. Now there are air amps.

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