Hi

I would like to ask what is the difference between one 770 and two 7100 bridged?

The price of 7100 is exactly half of 770.

The idea is to get a 7100 and if this is not enough powerfull (my speakers are NTH 2.5i with 86DB SPL) then I could bridge another 7100.

Would I loose some quality of sound?

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The 7100 cannot be bridged, so two 7100's cannot be combined into a single 7-channel amp. If the 100W/channel of the 7100 wasn't sufficient, I'd recommend returning it within the 30-day demo window and ordering a 770 instead. Or, you might be able to get some feedback from owners of similar speakers here in the saloon, see what amps they are using.

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gonk -- Saloon Links | Pre/Pro Comparison Chart | 950 Review

Not sure about bridging the 7100's but I do know the 770 drives my 2.5i's with no problem.