Last summer I posted a YouTube video of a comparison between my IC-7000 and IC-9100. Just listening to some VHF FM chatting going on; I thought I'd see what the difference between the 2 rigs would be - I re-cabled the antenna's to an Alpha Delta switch and was able to switch between them. That's it, pretty simple.
When I switched between the 2 rigs, I was pleased with the apparent sensitivity of the 9100 compared to the 7000. The night was somewhat quiet and there was very little background noise anyway; but still - the 9100 S-Meter was reading S-5 or so with the 7000 having no S-Meter movement.
The interesting thing is that I received a number of comments/e-mails/suggestions that I turn the 7000's pre-amp ON in order to have a "fair comparison" between the 2 rigs. Adam Farson (AB4OJ) has a FAQ which mentions the S-Meter is calibrated accurately when the Pre-Amp is ON. Page 148 of the 7000 manual states "Sensitivity (at pre-amp ON)" - which I never noticed at all before this event occurred...
Anyway, I suppose I need to give it a try and see what the difference is - I'm also wondering if the 7000 actually has a 2m/70cm pre-amp built in. It's on thing to turn on a setting, but it's another for the setting to do something useful. The 2m/70cm/1.2ghz pre-amp setting for the 9100 is designed to power an external pre-amp - doesn't do anything for the VHF+ bands at all.