My system is vintage. The bass has been ok, very good with some songs and lacking with others. Have been looking for a vintage EQ, while also thinking about getting the Loki Max.
After reading stuff all over the web, everyone said recap the crossovers. Did that, and the bass was a magnitude better, deeper, fuller, faster. So was the mid and high end. It really woke up the speakers.
After living with that for a bit, and still wanting more...
Did a full recap/refresh on my pre-amp. Another order of magnitude better, everywhere! Turned my treble from +4 to 0, and bass from +6 to +3. Everything was so much cleaner, clearer, most of all the lowered noise floor.
That lasted about 2 weeks...
Did a full recap/referb on my amp, same as above, just less so. But mostly lowered the noise floor, feel like I got another 50w out of the amp.
Just this week, wanting more low bass, want to feel it in my chair! Decided to move the speakers around the room. Spent about 3 hours measuring, taping, moving listening...
Found the sweet spot, might have been almost sitting in the null. Now I have powerful bass that I can feel, soundstage is much better, channel separation is better, tone controls are almost no longer in use. Bass is 0 - +3 depending on source and volume.
Will see how long this last, but still thinking about adding a sub, and/or a EQ. If something pops up used that looks like fun it will be added. But in the end of all this, my entire systems sounds 100% better, total cost was not much, but a ton of sweat equity.