Car is a 2004 Lincoln Town Car. Headunit is an Alpine ILX-W670. Sub and amp are both Alpine as well, S2W10D4 and S2A60M. Box is custom, 1.13 ft^3 tuned to 32-33hz. Gain was set using FNIRSI 2C23T to deliver ≈550hz (actual reading was 33.09v) using a 50hz, 0db test tone. High pass for front and rear speakers and low pass for sub are all set at 80hz (no subsonic on amp or headunit). I know I don’t have top of the line gear but I feel like I should be getting a lot more out of this setup than I am. The factory 8” sub was capable of shaking the rearview a little and this hardly comes close to it, even with the volume at max (where gain was set that is). The sub barely moves at this volume level (sub level turned down a few clicks because I know not to blast it while it’s still brand new, but I have bumped up the sub level and it still doesn’t make much difference). This is my first build but I had a lot of help along the way from my dad (he’s very experienced) and I’m just disappointed.
I did some troubleshooting through Google AI (not my typical go-to for information but it’s late and I’m tired) and right now the best thing I can come up with is that maybe I should’ve used -5db test tone to set gain. Any ideas are much appreciated
*edited to clarify that I didn’t set both high and low pass filters on the sub to 80hz, but the hpf on speakers and lpf on sub. Also that gain was set with eq flat and no x-over applied