Is powerfull Amps only for low sensitivity speakes?

Sounds good, Ozan! The Sonic Frontiers Line 3 is a fully balanced design, so it can certainly be assumed that it provides a balanced pair of signals on its XLR output connectors. And given the very high 300K input impedance of the GS150 there certainly won’t be an impedance compatibility issue.

Enjoy! Regards,
-- Al

Thank you very much for your valuable feedback Al.
regards, 
ozan

obatu
Is powerfull Amps only for low sensitivity speakers?

Obatu, don't just get caught up in the amount of wattage needed for the sensitivity. Yes this is important, but only half of the question/answer. As you have impedance also to deal with as well as negative phase angle. These mean how much current is going to be drawn from the amp, not just the wattage.
EG: As you can have a pair of speaker like Wilson Alexia which will be driven to sound far better with a 25w ML2 monoblock than a 1000w amp that has not much current ability.  

Cheers George 

But...SET/DHT amps using tubes like 2A3 and 45s in these flea amps can sound so much better than a 300watt bank of transisters.

I hope you can listened to the GS150 in your system first before buying" what is it you don't like about the Accuphase A60 anymore.