Building around VA Bach and Sonos

[altitude]

First post:

I'm looking to add an amplifier to my current setup and Emo seems a great value.
Right now I stream lossless through Sonos 120s. One 120 drives a pair of Vienna Acoustics Bach Grands (4 Ohms and rated for 50-300 Watts). I've gotten okay sound without either an external amp or a preamp but now I'm shooting for better than okay.

I'm looking hard at XPA-2 - this setup will be music only, no HT. Is this an appropriate amp for these speakers? I see they drive 500 Watts thru 4 Ohms - will I damage speakers or amp? Is this amp more powerful than I can use?

Also, I'm not sure a preamp adds much other than volume control for me as I don't use a phono or CD player (generally rip all my CDs to AIFF before playing). Do I really need a preamp if I'm not listening to other sources?

Thanks in advance for your thoughts.

[Porscheguy]

The XPA-2 would be great. Any Emo amp. I have a ZP120 as well and its a great little amp, but at only 55wpc class D you won't have a lot of dynamics with those 4 ohm speakers.

Few amps are too powerful for speakers unless you are foolish with volume extremes. In fact under powered speakers can create distortion, heat and danger.... Not always but it can happen. Yes, powerful amps will wake up your speakers with bigger bass and much more headroom..

I heard a ZP120 driving some Klipsch bookshelves and that sounded really great but they are 93db efficient @ 8 ohms I believe..