Originally Posted by pbc
I.e., first I set the distance control in the AVR where the curve looked best, then I tweaked the phase in the DCX until it looked the best.
Are you saying that set the phase to where the "dip" near the x-over point is reduced the most, maybe?
I plan on trying to integrate all 3 subwoofers next Saturday. Any step by step guides would help! I was thinking:
1. Remove all EQ and Audyssey processing
2. Measure the response of the front 2 AV15 subs
3. Adjust distance to get as flat a curve as possible
4. Adjust phase to get as flat a curve as possible (was only going to adjust one phase knob)
5. Adjust the level of the subs (keeping them gain matched) to 73ish db (actually, if I'm using the Dayton ECM calibrated mic, do I still calibrate to 72/73db or 75db?)
6. Add the low shelf filter to change the response curve at the bottom end (I think I use a shelf at 28hz and 5db of boost IIRC). Too bad REW doesn't have a low shelf filter optimizer of some sort!
7. Add as few PEQs as possible to flatten some peaks (will just run REW's EQ optimizer for this) and get the overall curve as flat as possible
8. Add the PB13 into the mix in sealed mode, keep phase at 0 and run REW to adjust the gain until it is in line with the front 2 subs (should result in a pretty low gain setting on the PB13).
9. Adjust the phase on the PB13 to see how it impacts the FR curve and if needed tweak it so that it is as flat as possible
10. Use the single PEQ on the PB13 to tame any new peaks
So what have I missed or done wrong in the above?
Sweep only the subwoofers to start, and nothing else. Measure at the LP.
I wouldn't suggest adding delay to the AV15's at all, since they are located near the main speakers as well as being fairly equidistant to the LP.
Skip step # 3 above.
Yes, you want to adjust the 'phase' incrementally on one of the AV15 outputs on the DCX. ( You would need to have one box on one amplifier channel, as well as using two independant outputs on the DCX )
Adjust the phase until you get the highest SPL at the LP on the top end of the subwoofer sweep. ( they will be in-phase, and act as one )
Add your low shelf filter to the AE boxes. The next step may vary slightly depending on where the PB13 is located relative to the other subs and the main speakers.
If the PB13 is farther away from the LP than the AE boxes, DELAY the AE boxes by that amount. If it's closer than the AE boxes, DELAY the PB13.
If the distance difference is small compared to the median in the seating ( I don't know if you have two rows or not of seating ) then skip the afore mentioned delay setting.
After the physical difference is accounted for, you must also rotate the phase on the SVS, and keep sweeping until at the upper end of the response shows the highest SPL at the high end of the range.
After that, then add in your EQ to flatten the response. Once the subs are EQ'd, then you can run Audessy.