In many cases in which bridging is allowed with certain amplifiers, great increases in power output are possible. But what are the downsides of bridging together amplifier channels?? I have heard the following possibilities: degredation of sound quality compared to the non-bridged version (despite the greater power output) and the inability of the bridged channels to perform adequately into the lower impedences, such as below 4 ohms. Are these two statements generally true and what are the major downfalls of bridging channels together in terms of sound quality and a control of a speaker? Thanks.