Re: High Gain Meas Amp- Duncan Distortion Or Duncan Alt 8
You want the SH-5 Custom. It's lows are downright chest-crushing but still tight. Fat, warm AND defined. Very good for Metal.
But first, I'd suggest to
a) turn up the bass on the amp
b) play around with the pu height. You shouldn't have the Distortion too close to the strings. Try to lower it a bit and the raise the pole pieces on the bass side.
If none of these options gives you what you want, get a Custom.
The Alt 8 will give you tons of low mids but not the low end thump you're after. It also lacks presence and aggression and is looser than the DD. It also has more dynamics than you possibly want so if you don't wanna beat the sh*t out of your guitar to get the heaviness you want, get the Custom.