Need an amp with a 'turbo' top end

I have a pair of speakers (modded Walsh Ohm Fs) that I love but they need a little extra 'life' blasted into their upper mids and top end. They are very detailed but not very extended and lack a bit of top end punch. Horns are a bit muted and don't give that 'blast' when they blow. I was wondering if anyone had any suggestions on an amp that would add a bit of this to the sound.

Thanks,
-Donn