I mentioned this earlier in another thread, does your amp have a gain control for the lin-in? If so you could adjust it accordingly. It will still sound better than an FM modulator.
I've been reading around on the Sounddomain.com forums, and everyone is saying how headunits with preouts greater than 2v sound better. For example, Eclipse decks are known for their 4v preouts, and usually produce better sound when used with an amp. Now my question is what kind of voltage comes out of most sound cards? Do they have the 2v or 4v preouts to make everything sound better? I am in the market of buying a soundcard, but i dont want to buy one thats not going to produce good sound when I used my carputer with my Audiobahn A6004t (75W X 4 @ 4 ohms). Thanks.
By the way my specs are:
Epia M10000 Mainboard
512 DDR Ram
30 Gig Western Digital
90 Watt Opus
7 inch Lilliput Touchscreen
Audiobahn A6004t Amp(Not installed yet)