I would suggest through the amp.
I have done it both ways, and if I remember right, it was less trouble using the preamp on the amp.
Joe
1999 Contour SVT ~ Black w/Tan
Current Mods: Fog light rewire, 20% Tint, SVT Banner,Rockford Fosgate RFX-8340, 2-12" Bostwick SPL Subs & Audiobahn 600x2
Future Mods: Knauberizing it, lowering
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