Originally Posted by hd_newbie
What if you are using speakers with an efficiency rating of 88db?
The 2 dB difference in power ratings remains 2 dB, so either amp would still be a good choice.
110 watts is about 21 dB greater than 1 watt, so at one meter, the SPL due to one 88 dB/w speaker would about 109 dB.
Short listening distance, say about 3 feet and 7 speakers.
Acoustic output a one point from multiple sources is not so easy to calcualte because of the certainty of varying phases due to the recording, room reflections, speaker directivity, etc. If things add up perfectly which never happens, 7 sources give an approximate 8.5 dB gain.
What kind of power output will be required before clipping? Say in an apartment for casual listening without going too high on the volume. Will 90 watts/channel distort?
It all depends on the loudness preferences of the listener and the frequency distribution of energy in the music. SPL > 110 SPL in the midrange is very loud, but if cleanly reproduced at 20 Hz, it is just a clearly noticeable very low pitched sound, almost more felt than heard.