Downunderwonder

Single in-ear is a no, hell no, not happening thing. Your brain can't process disparate volumes and you crank up the monitor to hear it while all the racket has full access to the other ear. I am guessing you aren't using any earplugs as yet? I recommend the comfy foam tipped metal ones from flareaudio.com in UK. Damping down everything makes it easier to hear everything way better, including myself. Might be all you need. If that's not enough I would tend toward a practice amp with a tuner out that you could put on the floor at your feet laying right back. Tuner out goes to stage amp. Turning its bass right down it will get loud enough to hear what note you are playing, with minimal interruption to life in general. Plop down, plug in power and string cable back to stage amp. Sound check is plucking an open D and bringing it up with your fretting hand. You should be ready before the drummer has shifted the kit into place.

Must be too rich for most basses.

There must surely be a market for a courier outfit that does what it says when it says it will, all without throwing the boxes around.

If it's anything like NZ's it has real teeth that are easily brought to bear. You only have to mention you know your rights under sale of goods act and they will cave. They have a schedule for expected lifespan on durable goods. TV's and fridges are something like 5 years trouble free operation regardless of the 2 year warranty. 9/10 they will give you a new one to get you out of their hair.

A BassBlock is pretty much just a small power amp with limited added preamp features at no extra cost. Properly safety rated micro power amps are slim pickings.

The kind of job where a bit of fear is good.

The visible junction indicates series wiring so the DCR fits with a simple wiring swap to a series pair of 8 ohm drivers. Quattro implies 4 drivers. Buggered if I know what's going on.

One 15 angled up should be most advantageous for staying under the FOH, ie generating less mud out front.

There's two kinds of guitarists. Most can't play bass very well, but some can, pretty rare ime.

It won't be hard to match the output level of the helix and input level of the amp to something the amp will accept as if it was a guitar. If you can get the amp with the guitar plugged in direct to sound 'Plain Jane' there won't be a problem getting the Helix to do the rest.

It's really hard to gauge other people's volume satisfaction requirements relative to our own. I can gig to a pretty rowdy party level where conversation is still possible at the back of the hall with the 160w into 210, drummer being the sensitive type and similar guitarist using a Tiny Terror 12W amp. I doubt the combo by itself will cover too many full room situations. Much more useful as a monitor rig. Adding an extension cab is a different story. You could do the 110 or the 208.

Most basses are some variant of P, J, PJ, and Stingray single humbucker. Having been messed around by noise from single coil pickups I favour humbuckers. My mainstay is twin humbuckers that can be switched to single coils. It has a dip switch for the neck that emulates the best of the J snarl, one pickup turned down a little, but with extra fat from the humbuckers, so single coil setting doesn't get a look in.

It's only a rumor in the US. In UK it's a cold hard rumour.

So you made yourself the leader? Sorta, kinda, not really? Band meeting time.

It sounds like you got the amp to use as a power amp for your cab, but you also want to use the amp's DI. Otherwise the question doesn't really make sense. If there's a 'pre/post' button for the DI then you want 'post'. Plug in and play.

The value in modeling is twofold. The sound comes out of a DI ready wrapped for FOH to put on show. There's a bazillion rigs in one box.

What Al could do with his current gear.

This is the point of FRFR cabinets. Provided you aren't stuffed on a stage with a hollow booming floor or a 10ft reflecting ceiling your customary preamp settings work very well for you, then it's down to the FOH to have their kaka together with the PA eq'd to the room.

https://www.bassgearmag.com/cab-lab-barefaced-audio-fr800/ pretty much the same BB2 cabinet but with power amp. Pretty gosh durned flat response.

Exactly. Milly Cyrus isn't so different to Mick Jagger.

I lament the lost art of the paragraph. Pop music changes styles over the decades. Yup.

Your BF cab is pretty much FRFR ( full range flat response ) so you're halfway there. You could use it in the PA and go IEM with a pretty good idea of what will come out the front already.

@agedhorse Might do the trick.

Needs some vowels to catch on.