Originally Posted by MKtheater
I usually run a flat response and boost the LFE to what I am used to but this system naturally extends deeper so the need for a hotter low end is even less. My example is running that scene and feeling much stronger at a lower level. This is a good thing. I guess my goal was to be flat to 3hz or wherever I can go to. I am not sure how accurate that under 5hz will be as my mic is only calibrated to 5hz. So I guess I want to be flat to 5hz and right now I am down 9dBs at 5hz. Should I care about raising that to flat? I won't worry about under 5hz as my equipment can't measure that anyways. I will just assume the room will do it's job.
Yeah, exactly- that's what I mean. You're already pretty flat to the point of your signal chain's rolloff- so the next step if you want more extension is to remove parts of the chain that contribute to that.
Since you are going digital (HDMI) from the player to the AVR, then AVR straight to FP14K- you really have only two sources of roll-off. I don't think you're going to get better <10Hz from another amp vs. what you have now (-3dB at 2Hz? not sure if this has been confirmed). So that leaves the AVR contributing, and a measurement straight through skipping the AVR should confirm the difference.
As it stands now, it sure seems like the AVR is contributing a lot- more than it should. So it may be a combination of measurement system / AVR. But like I said, skipping the AVR keeping the measurement the same would at least allow us to know how much that piece contributes to the final response.
I'd also probably look into removing the analog portion of your measurements like we discussed so the monster correction isn't needed and we can confirm your response really is what it is. It all seems right in theory, but when you have to correct so much down low it's hard to really believe how precise the end result is.
Then of course we need a solution. Bosso uses the BDP-105 I believe. This would be your playback source as well, and this is the response:
Top is BDP-105 + Bossobassis, the next one down includes his amp.
Originally Posted by bossobass
Remember, the amplifier is in the signal chain as well and I've measured several clones that began to roll off at 10 Hz and were -3dB @ 7 Hz and it was noticeable in playback and of course showed up on SpecLab when mic'ing scenes.
Man that's too bad. The placement of blocking caps seem to be inconsistent on these?Edited by nfraso - 11/13/13 at 9:22am