Originally Posted by AustinJerry
You should be concerned by the overall bass frequency response of your system. The main speakers begin contributing to bass response at the crossover (actually their bass contribution extends below the crossover, albeit at a rolled-off level). To assess bass performance, you need to measure not only the sub, but the smoothness of the transition between the sub and the mains. In audio terms, the bass (or modal) region extends to at least 300Hz, and in this range room modes affect bass performance, ringing, etc. That is why measuring the entire modal region is important.
Oh no doubt, I'll be getting to that. I just measured what my subwoofer was giving me. I worked on the left speaker for a moment without the subwoofer just to play with it (as the tutorial suggested). Should I just combine L+R+sub altogether as one and only worry about that, or should I do sub independently, FL independently, FR independently, FL+sub, FR+sub, then L+R+sub? Should I involve the center channel with any of these combinations?
Also, how concerned should I be with measurements above 300Hz? If I only get seven bands to adjust in my receiver for each independent channel, should I focus mostly on <300Hz settings to get those as flat as possible and not be as concerned about the stuff above it?
Finally, are you suggesting that I not be concerned about <15Hz? One of the reasons the sub has better extension is because I changed the tuning from 15Hz to Sealed. Before, there was a spike around the 20Hz region that I simply couldn't modify, because I can only change settings as closely as 31Hz. I don't know how I can do any extra modifications given what I have. This one had a much slower, steadier roll-off and I was able to do this more properly while getting better extension. But if <15Hz doesn't matter much beyond something like "Irene" in Black Hawn Down, I won't worry so much about that and stick with a roll-off at 16Hz. I'll probably change the crossover frequency back to 80Hz, but I believe I may have a null around 80hz as well.
Thanks. Next time I post measurements, it will be the original ones without any modifications from 15-300Hz. Though, let me know which ones I should post among these:
FL (no sub)
FR (no sub)
C (no sub)
FL + FR (no sub)
FL + FR + C (no sub)
FL + sub
FR + sub
C + sub
FL + FR + sub
FL + FR + C + sub