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Yes, I am following you on this Mike, and not only are you making sense that appears to be based in solid logic, but I expect some experience as well! Since my experience with amps that had the correct internal circuitry was far better than very good and since my injury has limited both my ability to get funds for extremely powerful lightweight but very expensive amps and prevents me from being able to move around powerful but extremely heavy amps it is important to me that I explore this option.
audiomik wrote: the Amplifier inputs aren't the critical ones, so long as there is a bi-phase source!
Thank you again for all your help! As to the impedance of the "crash test dummy" speaker, it is an 8 ohm speaker. Fortunately having used pro sound gear in my past including pro sound amps in bridged mono I am well aware of both the benefits and the dangers as well as the necessity of correct loads.
audiomik wrote: OK, well with a worst case of things failing then give it a try as you have described.
However do check the Impedance of your Car Sub driver before you try it as a Load.
I seem to think that Car Subs are often 4 or even 2 Ohm impedance!
And before others jump on this about using more professional Amplifiers with balanced inputs, I have on a number of occasions when needed used Hi-Fi Amplifiers in Bridge mode with much the same methodology as this thread describes. Mostly though for testing AC synchronous motors.
Sorry to hear of your back injury, getting old I have osteoarthritis so I fully sympathise with your condition