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[Migv6 le Frog Fan]

Yep, Bose are always 2ohm, while just about everyone elses systems are 4 ohms.
No idea why, but it makes life a bit awkward. Maybe thats the point ?

[2nddaniel]

This 25/50W rating looks like it means RMS/Peak.
Does that sound about right to anyone reading this?

[LC0112G]

This 25/50W rating looks like it means RMS/Peak.
Does that sound about right to anyone reading this?

Yes, but people mistakenly believe that the power rating equates to maximum volume acheivable - it does not. A much more important figure is the speaker efficiency, which you are unlikely to get for the OEM Bose speakers. Only about 0.5% - 2% of the electrical power into a loudspeaker is converted to sound power. The other 98-99.5% ends up as heat, and that's what the loudspeaker power rating tells you - how much heat the thing can dissipate - not how much sound output it can generate.

A 2% efficient loudspeaker will output 4 times the sound power of a 0.5% efficient one for the same electrical input. You would not be able to sit in the same room (never mid car!) if you could find a 100% efficient 25W loudspeaker.

So concentrate on finding a high efficiency 2 ohm loudspeaker, and any power rating greater than 10W (ish) will be fine.