Simplified REW Setup and Use (USB Mic & HDMI Connection) Including Measurement Techniques and How To Interpret Graphs - Page 495 - AVS | Home Theater Discussions And Reviews
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post #14821 of 14825 Old Today, 01:33 PM
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I'm using HDMI output from my laptop to the AVR for the test tones. My laptop only supports the "stereo" configuration and in the Output dropdown on the Soundcard tab my only options are HDMI #1 and HDMI #2 , which work as left/right speakers as expected.

In this scenario, is it possible to measure the subwoofer only, without any sound going to the right or left speaker? Or do I have to disconnect the front speakers if I want sub only, like I'd have to do with a non-HDMI output config?
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post #14822 of 14825 Old Today, 02:13 PM
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Originally Posted by lovingdvd View Post
I'm using HDMI output from my laptop to the AVR for the test tones. My laptop only supports the "stereo" configuration and in the Output dropdown on the Soundcard tab my only options are HDMI #1 and HDMI #2 , which work as left/right speakers as expected.

In this scenario, is it possible to measure the subwoofer only, without any sound going to the right or left speaker? Or do I have to disconnect the front speakers if I want sub only, like I'd have to do with a non-HDMI output config?
You will need to disconnect the front speakers to get a sub-only measurement. That's where running an external amp comes in handy--it is easier to turn off the amp, rather than unplugging the speakers.
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post #14823 of 14825 Old Today, 02:17 PM
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Below is the RTA of my room, does it looks normal to you? When I opened the SPL meter, it constantly read above 62dbs with just the fans of my projector and the Inuke running.
I have this issue also, but with the UMM-6 USB mic. My AC, refrigerator, and dvr all off. My noise floor seems to be around 60-62db. Interested to see what your issue might be.
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post #14824 of 14825 Old Today, 02:20 PM
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Jerry,

I set my front speakers to large and turned off Audyssey, but somehow bass mgmt still kicked in as you can see below. The frequency response looks really bad compared to my earlier cheapo speakers (HTIB type). Any advice?



In addition, during the measurement I hear strange noise from my left speaker at high frequency, which scared me. It never happened before with any other speakers, so my thought is would it be something wrong with my mic sensitivity? I am using the Umik-1 calibrated by Spectrum Labs with sensitivity factor downloaded and added to the cal file.

Below is the RTA of my room, does it looks normal to you? When I opened the SPL meter, it constantly read above 62dbs with just the fans of my projector and the Inuke running.

If you are sending the REW test signal to HDMI1 and/or HDMI2 and the front speakers are set to Large, you should not be getting a signal from the subs. Run the sweep again and feel the sub's cone--is it indeed moving? As for the quality of the measurement, I suspect the new speakers are placed in a different spot than the HTIB speakers, which may account for what looks worse. Experiment with different speaker placements. And BTW, I would measure speakers + subs.

The strange noise coming from the speaker cannot have anything to do with the microphone--a mic doesn't generate any sound.

And finally, a typical noise level should be in the 40-50dB range. A reading above 60dB would be a pretty noisy room, IMO. Is there a reason to have the projector running while taking measurements? I am not familiar with the iNuke. Does it generate noise, like with cooling fans?

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post #14825 of 14825 Old Today, 05:08 PM
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Does it generate noise, like with cooling fans?
Indeed, the fans of the iNukes are (in)famous for noise. Threads about replacing the fans abound. But that still wouldn't get a room to 60dB.

Did you really need to quote that entire post in your reply?
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