Originally Posted by aaranddeeman
I still am bit confused about measuring sub only or mixing it with L,R and C.
In other words, What all I need to do to send the signal to sub woofer only using HDMI (when your HDMI supports only 2 channel audio)
If I could augment d00d's feedback a bit. When you are doing your measurements, there are several objectives.
Objective 1-Use REW to assess the performance of the subs by themselves, which includes moving the subs around to find the best placement. To configure REW for this objective, you need to turn off the main speakers (either by carefully disconnecting their cables, or by turning off your separate power amp, if you use one). Feed the AVR with a signal on both the left and right channels (HDMI 1and 2), and set the AVR to stereo mode. Run sweeps 15-300Hz, and present the results without any smoothing.
Objective 2-Assess overall bass performance, which will include the contributions of the left and right speakers, as well as the center. For these measurements, turn the left and right speakers back on, set the crossover to the normal value (say 80Hz), and take four measurements:
- With the AVR in stereo mode, feed the left channel (HDMI 1 in REW) and measure 15-300Hz. Present the results with no smoothing.
- Repeat for the right channel (HDMI 2 in REW).
- Feed the left and right channels simultaneously, and repeat the measurement a third time (measuring left and right channels)
- And finally, keeping both channels active in REW, change the AVR to PLII Cinema, which allows you to measure the center channel.
These four measurements will give you good insight into how the bass region is performing in your room with your equipment.
You can also run full sweeps 15-20,000 Hz for the left, right and center channel to see how the whole spectrum is being reproduced. These measurements should have smoothing applied (anywhere from 1/24 to 1/6, depending on who you talk to).