Novice Help

[Truett]

My Windows 11 Sound Settings looks different than what's shown in the Austin Jerry Guide. I have REW working with 7.1 (8) channels, using Java. But when doing a measurement on a speaker, I hear a popping noise toward the beginning of the sweep that I don't remember hearing before. And when I do a sweep of the LFE channel, I get a warning that the distortion is high. (12% - 18% I have seen). Could this have to do with the microphone level(s) in Windows? I did not understand that part as the guide looks different than my sound settings. What should it be on? Or what else could be my problem. I am using a UMIK with 90 degree calibration file and a Trinnov Altitude processor.

Should the output be "EXCL:Altitude...." or just "Altitude...."?. Same with mic. "EXCL:UMIK....." or "UMIK...."?

Also, when I click on Check Levels it does nothing. But the measurement sounds and works.

 

[John Mulcahy]

Use the EXCL entries if they are available.

For the mic volume setting right click on the Windows audio properties level control and choose dB for the reading then set it to the 0 dB position.

When you use "Check levels" REW looks at the frequency span of the measurement to decide whether to use a sub or speaker test signal for the level check, if you are measuring 20 Hz to 20 kHz (for example) it will use a speaker test signal. If you are actually connected to a sub you will probably hear nothing from that, but for a sub it doesn't make any sense to measure to 20 kHz, 300 Hz is usually plenty for that.

 

[sm52]

 

[Truett]

Use the EXCL entries if they are available.

For the mic volume setting right click on the Windows audio properties level control and choose dB for the reading then set it to the 0 dB position.

When you use "Check levels" REW looks at the frequency span of the measurement to decide whether to use a sub or speaker test signal for the level check, if you are measuring 20 Hz to 20 kHz (for example) it will use a speaker test signal. If you are actually connected to a sub you will probably hear nothing from that, but for a sub it doesn't make any sense to measure to 20 kHz, 300 Hz is usually plenty for that.

When I click check levels on a L or R full range speaker I get -32 or -33 dB on IN and REF IN. Trinnov Altitude at -12db.

For the 4 subwoofer together. on the LFE output I get -18 db on IN and REF IN.

UMIK is now at 0db in Windows 11.

On the REW measurement page, R speaker, when I click Check Levels, I get "Level Low, -73.2 dBFS, and 48 dB SPL." See screen shot.

When I do a sweep it starts with a little popping and then continues a good sweep. Starts of saying 99db Headroom and goes down to 25.4 dB as the sweep finishes up.

Here is the SPL graph and Waterfall. I also included the measurement file. What settings may still be wrong? Any other comments for this beginner?

When I do a LFE sweep on the Subs it says "High measurement distortion 12.5%. That sweep starts with a popping noise, too. I am attaching that measurement file, too.

 

[John Mulcahy]

The silence when checking levels for the R channel is odd, perhaps something along the replay chain is muting when there is no signal on the left channel.

For your graphs (including waterfall) set the SPL range to 105 dB at the top and 45 dB at the bottom, you can do that by clicking the Limits button at the top right of the graph and entering the values there.

The sub distortion warning is caused partly by the measurement level and partly by measuring out to 20 kHz, so there is a lot of noise in the measurement. Try these options: