external cab

I just bought a BG-400 and have been using it in combination with my Markbass New York 121 cab at lower volumes just playin' around. Now, the Speakon out says 8 Ohms on the combo, and the cab is 8 Ohms, but I want to be sure that there isn't something that I am missing and you should only use...

I am not experienced in combo amp and external speakers as far as how compatibility works. For example do I need an external speaker with a higher wattage than my combo amp? Would I be able to hook up an Ampeg Portaflex 115 - 400w to my RB 210 - 500w?

Ok, since my Ampeg BA115 HP blew up at tryout/audition. Which is currently being repaired. Never had an issue in 5yrs so never thought about a backup. Only other amp I have is a Peavey Micro-Bass 20-watt Micro Bass. Which in my opinion sucks no low unless i cut highs and mids to zero. Was good...

Hi, Drummer for 40 years and new to bass and very new to the forum, so please forgive if this is obviously not possible. Inherited a Martin Logan Grotto active sub from my brother, as well as his '62 ReIssue Fender Jazz bass and wondering if I can somehow combine the two. I know it's possible...