Tilting them can help a bit, but I was never happy with the result as it threw the sound stage up a bit and there was a slight loss of focus. That, and I'm using the 22L2's as my example which have the additional driver.
Biggest influence on bass from my experience is (a) amplification and (b) speaker placement from rear wall that doesn't exceed 24" and isn't less than say 16" when dealing with rear ported floor standers.
You may consider auditioning a MF A3.5 if the A5 is out of reach. Even an A3.2CR which can be had for around $600 used. These amps have the most low end of those I've demoed or purchased so far and they don't dissapoint. I know we all have our favorites, but I can attest that they work beautifully with the Quads as I've had both the A308I and the A5. They do wonderfully well in home theater duty as well. Some will mention MF amps add "coloration" to music like cardas golden cross interconnects, but everyone has their own taste and it sounds like low end response is what you're looking for (I can't necessarily reccomend the golden cross ICs though, I didn't care for them but others do...).
Biggest influence on bass from my experience is (a) amplification and (b) speaker placement from rear wall that doesn't exceed 24" and isn't less than say 16" when dealing with rear ported floor standers.
You may consider auditioning a MF A3.5 if the A5 is out of reach. Even an A3.2CR which can be had for around $600 used. These amps have the most low end of those I've demoed or purchased so far and they don't dissapoint. I know we all have our favorites, but I can attest that they work beautifully with the Quads as I've had both the A308I and the A5. They do wonderfully well in home theater duty as well. Some will mention MF amps add "coloration" to music like cardas golden cross interconnects, but everyone has their own taste and it sounds like low end response is what you're looking for (I can't necessarily reccomend the golden cross ICs though, I didn't care for them but others do...).