AVS Forum Addicted Member
Join Date: Feb 2010
Location: Monument CO
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Yes, it would probably take years for the speakers to degrade, but I tend to keep speakers a long time and prefer to spend my money elsewhere... The cabinets might look worse before you hear any difference.
You'll have reflections no matter what. You might consider whether you care about stereo sound in the bathroom and how you would implement it; a speaker on either side of the vanity might work. I leave early, and we just have an AM radio in our bathroom so I can hear the news, traffic, and weather before I leave, so I am not a good reference for quality bathroom sound.
Sensitivity is generally expressed in dB/W/m meaning 87 dB/W/m will produce 87 dB SPL at 1 m with 1 W input. The 92 dB/W/m speaker produces 92 dB at 1 m for that same 1 W. The difference is 5 dB, which means you would have to put a little over 3 W into the 87 dB/W/m speaker to play as loud as the 92 dB/W/m speaker using only 1 W. At 30 W into the 92 dB speaker you'd need >90 W into the 87 dB speaker to play as loud. "Better" means different things to different people, and sensitivity is but one of many speaker design parameters. for example, small speakers often trade sensitivity for more extended bass response; e.g., they won't play as loud but will play deeper. If to you "better" means "louder" then the 92 dB/W/m speaker is better. About three times better.
HTH - Don
"After silence, that which best expresses the inexpressible, is music" - Aldous Huxley