Check this out for lots of info about parallel LM3886. It also has info about bridged and bridged-parallel. You are interested in the PA100 (parallel 100W). This can be built with 2 LM3886 or 1 LM4780.
http://www.national.com/an/AN/AN-1192.pdf
http://www.national.com/an/AN/AN-1192.pdf
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