Originally Posted by AustinJerry
A quick comment on your graph presentation. What we are interested in is the response of a speaker+sub, which is normally how you would be listening to your system. Presenting a measurement of the speaker without including the sub is, in my opinion, not very useful, and only makes things harder to read. And the measurement of the sub only should not change from one graph to the next, so there is no need to repeat if because, again, it makes things a little harder to read. I mention this for you to consider for any future postings you might make--no need to redo this set of measurements.
I think the sub response with Antimode correction on looks quite good.
The response of the left+sub looks a bit peculiar, with a lot of narrow peaks and dips around the crossover region. The right+sub does not seem to exhibit the same peculiarity. To me this indicates a lack of symmetry from left to right, perhaps caused by the placement of the speakers in the listening room.
The center+sub has a deep dip just below the crossover point. Have you experimented with adjusting the sub's delay to see if the dip is caused by a phase mismatch between the center and the sub?
My overall impression is that there is probably room for improvement, but we don't have enough information about your listening room, it's equipment, or the placement of the speakers and sub(s) to make any recommendations. You have presented these measurements without saying anything about what you think about how your system sounds. Does it sound perfect to you, or is there something lacking that you would like to work on? Also, do you use any type of room correction, Audyssey, YPAO, Dirac? If not, room correction probably would be a good step towards improvement.
Thank you AustinJerry.
I take note of your advise about posting my graphs.
See my signature for my room dimensions. TV is on the long wall. 8 mounths ago, I discovered a little microphone in my receiver box !!. That is when my addiction began.
I ran YPAO and the sound tage imaging changed so much that I understood that I never had good sound in HT before.
YPAO does not EQ the sub. I bought Antimode Dual Core 2.0.It made a huge difference. I read the room measurements from Antimode with REW and I made many attempts to find the best place for the sub. Now it is between the mains nearer the FR, on the same plane than the mains. Fronts are 51cm forward the front wall. Right speaker is at 127cm from the right wall. You are absolutly right about the lack of symmetry: the lefte side of the room is the corridor leading to the other room of our basement (the corridor is along the front wall at left of the main listening position) Each night, I moved forward the left peaker into
the corridor. I also changed the place of the chair of the MLP. With WAF, I moved it from right back the back wall to 49cm forward. I have no more options without WAF clipping !! Room treatment would come with a divorce procedure ( just kidding).
Recently, I used REW and UMIK-1 to confirm my findings.
Now, I want to acheive the smoothest response at the crossover region before to decide if I could improve the sound stage with Dirac Live.
You asked if I had experimented with adjusting the sub's delay to see if the dip is caused by a phase mismatch between the center and the sub?
It is the exact reason why I posted my graphs: to know if it would worth it.
YPAO sets speakers distances to 2,70m (which is correct) and sets sub distance to 5,40m. I also made measurements with REW with different crossover fr for center+sub at 80,90,100,110 and 120hz. The flattest curve was at 120hz. The theory said that 120z is too directionnal to be good.
Before to follow the procedure suggested with Real Time Analyser in REW in the addendum of the paper "Audyssey sub distance tweak procedure" .
I would like to know if it is better to put a higher crossover fr first and the procedure after of if it is better to stay with 80hz .
Thank you again for your much appreciated help.