Hendrix1790

Aren't the smaller lowering springs usually stiffer to avoid bottoming out under normal driving conditions? The new springs might not sag as much as the old ones comparatively.

Might have to do with other settings, like headunit crossovers or amp low pass filters.

Fi X 12's with BP power? They are rated for 250 watts, but I'm assuming with BP power, they can take closer to 500w.

Why not go with a SAZ-1000d. I think they are cheaper, and it's 1 ohm stable. I don't think the rockford is, but I could be wrong. BTW, I meant cheaper then the rockford. The Audioque amp would be a good choice as well.

I have these, they are good. Recommend as well.

Oh, used... Try caraudioclassifieds.org

Ficaraudio.com the only place to buy them.

I would guess no. It looks to me like its meant more of small circuit boards with that probe and ground clip. But I don't really know anything about oscopes.

You're going to hook it up to the output of the amp, right? You think it can take that kind of amperage?

15" ported will probably be louder. An 18" is cooler though lol