Recently I posted about the option to buy a Dynaudio Sub500. I wasn't sure whether I should pull the trigger on that one, or go the DIY-route, since I already had an elaborate (but complicated) design. For the asking price it seemed like a good deal, but I was able to pay even less. Given the state it's in (about three years old, seemingly very few working hours and looking practically new) it was an absolute steal. Needless to say, I bought it. And I love it! Together with my Special 25's, I can safely say that I have only once heard a setup that sounded more complete and coherent. I could probably make it even better with a better amp, but that's another story.
I do, however, have a few questions regarding placement and setup parameters of the Sub500. Especially to those who use it with Special 25's or similar monitors.
I currently have it positioned directly to the right and slightly behind my right speaker, due to room constraints. The driver faces inward, not towards me. The x-over on the sub 500 was set to full range, phase at 90 degrees. The crossover in my AVR was set to cross to the sub at 40Hz, the S25 running full range. This way, the sub will only work below 40Hz, unfortunately also heavily filtering LFE tracks. This works pretty well for most music tracks, resulting in some minor loss of perceived energy at around 40Hz with some music material. Setting up my AVR to cross over at 60Hz results in more bass-presence (no or less loss of energy around 40Hz), but also makes the bass sound somewhat sluggish or bloated. Turning the sub volume down helps somewhat, but then the extreme lows suffer from that. Even though my overall sound is great, I keep having problems getting seemless integration with a sub. My last two subs were B&W ASW610 and Adam Sub10mkII. Both had trouble integrating well.
Is this really a matter of tweaking parameters, or more a problem with placement? When crawling the floor with the Adam sub in my lisening position, I got the loudest deep bass (and best overall sound) in the corner the sub is now in.
What can I do to further improve the smoothness of the ultra low end (apart from purpose-designing a room for it
I'd like to hear from you sub woofer users! Thanks!