Bel Canto S300 driving Gallo 3.1s

Hi all,
My setup is:
Logitech Transporter
Bel Canto Pre-3
Bel Canto S300
Gallo 3.1s

I am running balanced high quality cables and 10ga speaker cables.

My question is, it seems like I have to turn the volume up quite high on my Pre-3 (all the way up on the Transporter) in order to get the Gallos to put out some sound, especially bass.
I am using FLAC files, so sound quality shouldn't be much of an issue. Is the S300 just too weak for the Gallos?