Bridged or Parallel 100w LM3886?

[rockgardenlove]

So I'm gonna build the PA100 or BR100 off this datasheet:
http://www.national.com/an/AN/AN-1192.pdf

I can't find much on which to choose though. Any strengths or weaknesses I should consider?

Thanks!

 

[pacificblue]

If you don't even read the first page of that document, don't build either.

Bridged for 8 Ohm speakers. Parallel for 4 Ohm speakers.

 

[eranrund]

Hate to put a question that sounds a bit 'wise guy' kinda question, but what is suggested when the average impedance of the speaker is 6ohm?
bridged parallel setup?

Thanks

 

[pacificblue]

Parallel for 6 Ohm.

The ICs are specified for 4 to 8 Ohm loads. If you bridge them they 'see' half the impedance. A 6 Ohm speaker would mean a load of 3 Ohm for each IC, which is too low.

 

[eranrund]

Makes sense, thanks