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Stereo Amp Combinations

Get yourself an old Acoustic 320. Two separate channels in one box. This is what I use when I play my Rickenbacker's ROS. Hope I'm explaining this right: 2 mono cables from the 320's input jacks, into the Ric O Sound box, then 1 stereo cable into the ROS jack on my RIC.
 
I did a similar thing when I had a Rick.

pick up dual mono preamp, feed that into a stereo graphic EQ, run that into a 2 channel power amp. viola!

I used a focusrite ISA, into a dbx graphic, into a crest power amp.

ran one signal to the 4x10 cab, the other to the 1x15 cab. I used it in a stack, and it sounded great.

I have pics of that rig somewhere, but this was the 90's, and I was happy to lug that stuff around to gigs and parties.

*sigh*
 
Are you looking at a couple of CL amps - 150w & 300w ? If so, there will be no diff. until you max out the smaller one which will be fairly loud on its own and perceptively much louder paired with another amp set to the same volume.
Your sound will be big and huge running two amps and can be loads of fun running serial and/or parallel signals. Not too practical for playing Mustang Sally but for originality, anything goes and I wish you the best of luck.
 
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Once upon a time I had a stereo Ric. I used a Fender Bassman 100 with 2x15 cab for neck pup and a Fender Twin for the bridge pup. It seemed to work fine for me.
With two different amps, you can adjust volume levels to suit. Your sound man will hate you, of course.
 
I've used Yamaha Attitudes for years and am currently using a custom build jazz bass wired very similar to the Attitude.
I used a stereo rig for awhile but these days I plug both pick ups into a Boss LS-2 Line Selector and use that to balance overdrive and low end and find it works very well.
Gives you a ton of way to run effects. IE Overdrive on P/J Pickups, Flanger on bass pick up or putting a pedal after the LS-2 to effect both channels.
This way I find is alot better than doing everything on one channel so I'm not getting overdrive on my bass pick up.
Still gives you screaming distortion while maintaining a solid bass tone and its way cheaper than buying two rigs, not to mention having to lug it around.
 
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several Phil Jones amps have 2 inputs ...

I've seen a few pedal type preamps with 2/3 inputs , ... but I have no idea if they can be used at the same time ..??

you could use 2 preamp pedals and run them into a A/B/Y type box ... then into 1 amp ..?? if you want to Blend on the fly , maybe a stereo volume pedal set to pan , before the A/B/Y box ..?

my current preamp that I use in the studio , has several inputs ... which I can run 1 guitar that has regular pups , plus peizo acoustic pups into 2 inputs , thru independent processors , then into a mono out ...
Line 6 HD ProX .... I'm not crazy about the onboard bass preamps/amps , so I have a few out board pedals before this unit ...