Absolutely NOT. Never plug two amp outputs into the same cabinet. You'll fry one or both of the power amps.
Just wanted to say i have hooked up 2 power amps to 1 speaker, or more specifically the left and right positive leads from a stereo pwr amp(did nothing with the negatives). I did it with an old Macintosh tube amp and also a Cmos type amp i cant remember the brand of. I doubt you could do this with some amps. And 2 totally separate amps ^^shrug^^ Ill let ya know when im willing to sacrifice a couple.
However all mids and lows were washed out leaving only highs that sounded tin cany , But there was some cool echo effects going on with this. Made me wonder if thats how they achieve surround sound in some systems.
My thoughts on hooking 2 amps to one cabinent for bass would only work if there were multiple speakers ,and you just add the wireing so they are essentially 2 separate speakers. Although probably not gona be optimal , but might work decent with the right speakers. The other option would be a dual voice coil speaker. But how many times do you run across one of those specifically for instrument bass?
Ive spent alot of time hooking up different speaker combonations , Blown my share of amps and speakers too. I suggest if your interested in experimenting , invest in a multi meter or ohm meter atleast. Its kinda fun hooking up a wall of cheapy speakers through multiple series/paralell sets.
And I'd like to add that i thought I had a pretty good grasp of what I needed to know when shopping speakers. Come to find out that db sensitivity rateing is kinda important and not just one of those worthless #'s to leave for the sound guy techies
Thanx for a great post Mike