Michael, not to challenge your findings or experience, but i have a copy of test review for an amp that basically ( give or take by a very small amount ) does "double down" as impedance is halved. I am not talking about rated power but actual power at clipping. After all, that is what matters most and tells the true tale of how much current the power supply and output devices are capable of sustaining. The amp under review was tested down to 2 ohms and was pulling appr 20 amps of current at that impedance.
Other than a select few amps like the one above ( which act as a true voltage source ), Michael's statements are right on the money. I would even go so far as to say that most "normal" amps don't produce as big of a difference between 8 and 4 ohms as Michael states ( almost doubling ) and the differences get even slimmer between 4 and 2 ohms.
As to "good" and "bad" sounding bridged units, that will obviously vary from design to design and how that design is implimented when going into bridged mode. There are obviously more than a few ways to build a piece of gear with the designer's personal preference ( or is it the "bean counters" that matters most ??? ) coming into play. Sean
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