I agree about the 3.0 -- great little speaker! You can't go wrong.
I got a friend to buy the nOrh SE9 tube integrated amp + nOrh 3.0 drums and he is very happy.
I also bought a pair of 3.0s for my mom. Paired with a Korsun u2 50 wpc SS integrated amp it truly rocked even in a large bedroom. I had them placed in corners of the room. It was loud even listening from another room separated from the bedroom by a living room and a hallway.
One thing the 3.0 won't do is mid/low bass, but it still sounds satisfying.
By the way, doesn't the Zen C put out something like 2 watts? You may want to consider the nOrh SE9 (9 watts/channel), which will give you much more volume (I have used my Radii 300B SET 8 watt/ch amp with the nOrh 3.0) and more flexbility in case your friend decides to try different speakers down the road.
Also, it would also be worth the time (and $5 in Blue Tak) to dampen the transport of the cd player.
http://www.audiocircle.com/index.php?topic=9365&start=40