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Darkglass b3k v2 - not playing nicely with new amp?

You can see if the problem is in the amp or the cab by recording your amp via DI out. I'd imagine that your new cab is just a lot more bass heavy than your previous, I've had similar experiences when using MB 212 cab. It makes distortion "disappear" because high mids (where the signature b3k sound is) are much less present in the new cab.

Oh cool, thanks I'll give that a go too!
 
SO i just remembered (derp) I can just use the headphone out to check this, can confirm it is the cab not the amp. Bit annoying but reassuring it's not the amp - case closed, thanks everyone!
Makes sense. You were likely pushing that little 8" a lot. Will need more overall volume to do that now.

Good luck with it all! Gain stages and pedal stacking is crazy science.
 
I think i remember reading something about the B3K working mostly on the high end and leaving the lows alone, but would the HPF on the amp be that drastic as to cut them out completely?
A high pass filter allows signal above the cutoff frequency to pass through. The D800 has a built-in HPF with a fixed 30Hz cutoff frequency; everything above 30Hz (including every note on a conventionally tuned 4-string bass) will be unaffected by it.
 
Is it possible that you have just been hearing the little 8" speaker breaking up the whole time?
^This. I have a tiny little 8" orange combo that I practice with sometimes, and at any kind of volume the speaker distorts. I can almost guarantee that some of that sweet distortion sound you liked so much was actually coming from the combo and not the pedal, and in that case... I don't know how to help you. If that's the case then you might not actually like the sound of the b3k at all. Where about do you usually have the "blend" knob set?
 
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SO i just remembered (derp) I can just use the headphone out to check this, can confirm it is the cab not the amp. Bit annoying but reassuring it's not the amp - case closed, thanks everyone!
This just validates my last point even more. Now you're likely overdriving your headphone speakers as well. If it's the speaker distortion you like the sound of, maybe a fuzz pedal would be more to your taste?
 
Very surprising. The B3k is a pretty strong pedal. I could understand if you had a Vintage Microtubes. It sounds like the Rumble was adding it's own overdrive. I am by no means an expert but this doesn't make sense to me.
I'm not so sure about the "pretty strong".. Own one myself, amongst a lot of other, and just like the OP, it has to be crancked up quite a lot before it starts to do what I want...