In article EPfic.610$yd1.356@newsfe1-win,
beeyp jars wrote:
I was about to purchase the Beyerdynamic DT990 PRO
(http://www.veronica.co.uk/dt990.htm).

But noticed its impedance is 250 ohms and my sound card's manual
(Creative Live 5.1 Digital) says 32ohm for the OUT socket.

Q: Will it sound very bad with a low volume and hence definitely require
a headphone-amp?

Pretty well all headphones will work ok off a 32 ohm output. High
impedance types may not go as loud as they can, but the difference is
likely to be marginal.

--
*I never drink anything stronger than gin before breakfast *

Dave Plowman London SW 12
RIP Acorn