Dave, to clarify or re-emphasize the point, I noted that you had rather casually talked about a "few dB" difference between each of those models. That's why I specifically pointed out that the difference was 1dB or less. It's fairly widely known that doubling power results in only a 3dB increase in sound level. The numbers for 1dB and 2dB are respectively, 1.26 and 1.59 times the power. So, to get just a 1dB sound level increase over 90 watts input requires 90x1.26=113.4 watts and for 2dB more 90x1.59=143.1 watts.

90 watts, and your 1909 would be slightly conservatively rated, as is common with HT receivers, would provide for a 104-105dB level at your 12' distance. Increasing that number by 1-2dB would hardly be a significant increase. Enjoy the great sound(when you play great material)through your 1909 and M80s.

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Enjoy the music, not the equipment.