Originally Posted by netroamer
I recently did a complete firmware wipe of my D2 to evaluate if a wipe and reload would make the HDMI handshake problems I've been having improve. That did work to a small degree.
The puzzlement came when I used the internal calibration tone to first balance the speaker output. To achieve the 75db level with the sub-woofer, I used its' volume control.
When I ran ARC, it could not complete the sweep sequence due to low sub-woofer output. I raised the SW output volume a few time to finally get it to finish the cycle on the first position. It completed the rest without a problem.
When I uploaded ARC to the processor to analyze speaker levels, ARC set the SW level to -5.5db. It struck me as odd that it would error out due to low volume and then cut the SW output.
Doing a forum search did not come up with a similar problem.
Anyone else have he same issue?
ARC uses the "Noise Level" line in Setup > Level Calibration to set the volume of its test sweep tones. [NOTE: In the AVM 50v and D2v firmware this is labeled "Test Level".]
Zero out all entries in Setup > Level Calibration. Set test mode to Manual in the first line. Scroll down to Noise Level and adjust it to yield roughly 75dB SPL (sound will be coming from the LF speaker). Now scroll down to either subwoofer line -- which will still be at 0dB. Leave that line at 0dB (and also leave Noise Level where you just set it) and adjust the volume knob built into your subwoofer to yield roughly 75dB SPL.
Exit Setup and go do your ARC Measurements. Only the Noise Level line and the volume knob setting on your subwoofer matters. This is why you don't have to redo this stuff for subsequent ARC Measurements. The speaker volume trims ARC Uploads from prior setups will just be ignored when you do your next Measurement.
If ARC has trouble hearing the audio from the subwoofer at any given mic location, just tell it to retry a time or two.
If it STILL can't hear the subwoofer properly, don't raise the volume knob in the subwoofer. Instead exit ARC Measurements, go back into Setup > Level Calibration, and raise Noise Level a couple dB. Exit Setup and redo your ARC Measurements from the beginning.
ARC listens to a much wider frequency range than is represented by the test tones built into the Setup > Level Calibration menu. For example it goes all the way down to 5Hz for the subwoofer. If your subwoofer has an unusually wide variation in output across its frequency range, ARC may need a different volume level to help counter that. In addition, if Noise Level is not set properly, ARC may need to adjust the basic volume level of the whole solution to get the main speakers where they need to be, and then ARC will have to re-adjust the volume of the sub more than normal to correct for that.
If your room has significant room nulls or resonances in the bass frequencies, these will likely show up more at just some mic locations. That's why ARC may have trouble at one mic location and not at others even though the sub output sounds just fine to you from where you are standing while the test sweeps are happening.
Also, it is often the case that ARC will hear ambient noise in the bass frequencies during a test sweep that you can't hear. And thus ARC will tell you it needs to retry. This is much more likely to happen for the subwoofer than for the other speakers. Just tell ARC to retry.