First off -- Happy new year to everyone!
This was a very noobish question from the start. I think my problem is that I was desperate for anything to try.
I don't care much for the mid range bass which I would call a tin rattle type of sound. My high pass setting on the deck maximum is 125 hz, so I'm thinking those sounds are from my speakers and might be around 125-200hz. My guess is that having loudness on low was emphasizing frequencies closer to 40 hz and not giving enough sound around 80 hz. Which is why everyone says not to use loudness/boost settings.
My install is new, deck is new; sub I've been using for years and the amp was used for a few years around 2008-2011, but very similar to the amp I had previously been using with this sub.
Embarrassingly enough I think the problem is mainly getting the deck settings just right. Initially I was changing the loudness (low or off) and bass boost (+1-2 of 6), knowing full well that those should be off.
What I've done now is turn both loudness and bass boost completely off. The reason for ever turning loudness on in the first place was that the deck didn't seem to be giving my amp enough signal. Gain is probably ~70%.
I've definitely had a lot more luck adjusting the EQ and leaving loudness off. Bass boost was the first thing I turned off because I didn't want any risk of distortion. My current EQ settings are flat or negative with the exception of the two lowest frequencies (40 hz and 80 hz). This allows me to turn the volume up louder without having too much power to my speakers. The higher volume, pushing more signal to the amp ends up sounding much better. This won't mean much but my normal listening volume went from 10-11 to 13-15.
After listening to it for a week or so I will probably know if these are my desired settings.
Many forums aren't friendly to newcomers. I greatly appreciate the helpful advice!
I've also been debating about trying out a new box:
Alpine Type R 10 inch Ported Subwoofer Enclosure
Problem being I know you get what you pay for and that I should pay around $200 to have a custom box built. But this one seems that it might be better than my current sealed box, it is a pre-fab.. but designed for my specific sub.
TL;DR
- Should have kept loudness and bass boost turned off
- Loudness on low seemed to be boosting 40 hz and leaving 80 hz too low
- Without loudness EQ settings are much more effective
- Lowered EQ settings (excluding 40 and 80 hz), turning up volume provides better signal to the amp without speakers being too loud
- Thinking of replacing sealed pre-fab box for vented pre-fab box designed for my sub, worth $60..? Aware I should have custom built for 3x the cost.