A preamp wont work for the LCD 2 alone.
There are a couple schools of thought in headphone amp design.
There is the "low-power power amp" school, and the "high-power preamp" school. The line between them is blurry, but since only about 3 people acknowledge that differences exist the debate is pretty quiet. Generally, the low-power power amp camps are able to put more than 3W into some load (not necessarily 8ohms, but often - its not really that hard) and are pretty obviously scaled-down power amps, and the high power preamp camp that generally focuses on lower power "scaled up" preamp circuits.
Now that thats out there, as a proud member of the hopped-up preamp camp, hopped up preamps will not drive LCD-2. At the minimum you need a low-power power amp. Depending how loud you like the beats you may want a real power amp.
If your integrated amp has switched outputs for a second set of speakers (older home recievers had this, dunno what its really called) hook the LCD-2 up to that and rock out. Otherwise buy a real amp just for them. Its not hard to find a smaller integrated than what most people consider to be a respectable preamp.
Edited by nikongod - 7/26/11 at 6:26am
