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Does this hypothetical amp/pedal setup work?

So, until I’m in a position where an SVT is a practical solution (it’s a dream for now), I was looking at pedals/boxes lately that would give me the sound. The thing for the job seems to be OE’s Bassrig SV.

What I want to know is this:

I have a Fender Rumble 500. It’s pretty portable and the volume is good. But, I can’t get a good tone out of it with two of my basses.

Would running the Bassrig through the effects return work to bypass the built-in preamp? As in, would it be operating as a plain old cab that way, letting the Bassrig be the ‘brain?’

Or am I missing some steps here to do this?
 
It should work in a pinch, but seems crazy to me. I'd sell the amp, cut your losses there, then get one you genuinely like, and tweak it from there with the pedals you want - or maybe you'll just love it as-is...

Only exception to this advice would be if you wanted to keep the Rumble for a more portable setup, or something to leave at rehearsal space, etc. and then have your main amp available for important gigs, recording and whatnot.

For SVT sounds, Tech21 VT Bass is really nice and won't cost you as much as a new amp by itself. I am sure the bassrig is nice though, and it should be for that price!
 
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It should work in a pinch, but seems crazy to me. I'd sell the amp, cut your losses there, then get one you genuinely like, and tweak it from there with the pedals you want - or maybe you'll just love it as-is...

Only exception to this advice would be if you wanted to keep the Rumble for a more portable setup, or something to leave at rehearsal space, etc. and then have your main amp available for important gigs, recording and whatnot.

For SVT sounds, Tech21 VT Bass is really nice and won't cost you as much as a new amp by itself. I am sure the bassrig is nice though, and it should be for that price!
I'll update my own reply...if you're mainly concerned with your DI sound for FOH, and just want to keep the Rumble as a stage monitor without needing it to be your be-all-end-all, that is another valid angle of approach, and it will work great for that.
 
He's looking to let his pedals make the tone, and not be colored by the amp. That's exactly what I like about using GK MB stuff.

Take away GK's main form of color, its preamp (EQ voicing, contour, control, presence, etc), and additional coloration can still come from its speaker/cab voicing... which depending on cab can have a noticeable effect on tone. Cabinet-to-cabinet, the GK (which often has ported designs and strong low-end extension) can sound more more modern and extended than Ampeg even with a Bassrig pre running through it.

[COLOR=rgba(255, 255, 255, 0.87)]Given that, if I were the OP and were interested in buying a preamp pedal to use with FX/Return to sound like an Ampeg I'd first try a pre pedal with the Rumble (whose cab might have its own sound) and see how it worked before thinking about swapping out the amp too.[/COLOR]
 
I think I've owned 7 GK amps, they are my favourite amp company. But what gives you that impression? OP wants to sound like an Ampeg.
Again, he wants to use his pedals for tone and just amplify that. This is exactly what I do. I don't need the amp to make the tone, I want the bass and pedals to do that part and I think thats what he's looking for.