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One Speakon Output and Two Cabs: What Do I Do?

... take a wild guess that this was the BL250??

Exactly right.

It was the first rig I bought when getting back into playing bass after an almost 20-year hiatus. I'd used a GK guitar amp with a couple of 12" JBL plus horn speakers (part of son's DJ set-up) and it sounded great so I was expecting a similar experience. No such luck. I was so disappointed with that.

It was a relatively cheap reentry into bass gear and was touted at the time as being a "made in China" version of their US designs. Never could get that rig to sound decent at gig levels with the single 15" speaker it was relegated to. My plan had been to add it to my Sunn 212 cab or hook up the speaker-only from the Yamaha B50 combo my son had left with me and run a 2 x 15 set-up. Was a shock when I saw it was 8 ohm minimum as that was never mentioned anywhere on any of the spec sheets or I wouldn't have bought it.

I continued to use the GK115blx speaker for years along with an acoustic B410 and as long as I knocked about 2 to 3 clicks off the bass EQ on my first Eden amp (Nemesis RS400) it sounded good. No worries now though, I've moved on to Eden and DNA (David Nordschow Amps) gear now so my GAS has been abated for the time-being.
 
If they're coloured green then they are combo sockets. Black are SpeakOn only.

Not for the gear I own. Here's a pic of the back of a Markbass Tube 800 (identical to mine)

Liitle-Mark-Tube-800-back.jpg

And here's a link to the manual: Invalid Link Removed

On page 3 the diagram labels the top speaker output as: SPEAKER OUT SPEAKON / 1/4" COMBO JACK
And I can verify that I've used it with both types of cables.

I also have an Orange bass cabinet with black combo jacks.
 
Not for the gear I own. Here's a pic of the back of a Markbass Tube 800 (identical to mine)

Liitle-Mark-Tube-800-back.jpg

And here's a link to the manual: Invalid Link Removed

On page 3 the diagram labels the top speaker output as: SPEAKER OUT SPEAKON / 1/4" COMBO JACK
And I can verify that I've used it with both types of cables.

I also have an Orange bass cabinet with black combo jacks.

I don't know about your eyes, but that jack is dark green.
 
And if it's not clear to OP yet. He can run a single 8 ohm, Aggie SL cab with, of course one speaker cable, from his Mark Bass or most other amp if he chooses to for lower volume, home, etc. playing. You may not always need two cabs, so this is another option. Again, if that wasn't apparent already. Good luck with your new rig, let us know what you end up with.
 
What about running last speaker jack out back to 2nd speaker jack on amp? Is this correct?
In general not a good idea because with a few amps there are separate power amps for each output and doing so would damage the amp.