I would advice EXTREME CAUTION when using these... you could inadvertently damage your speakers or amplifier of both using such sustained (29 seconds duration each freq) subsonic test tones !
Most speakers (excluding subs) will not produce any significant output at Subsonic and extreme LF frequencies.
Check out this page from REALTRAPS ... The page provides a wealth of information to test Room Nodes.
You can download all the (sustained) Test tones: 10 Hz to 300 Hz in 1 Hz increments, as a 3 MB zipped file. Each tone is sustained, so as to activate any room resonance. The track numbering provides a clue of the Frequency band being played out.
The last track (Track 30) is a wide band pink noise Wave file, duration 15 seconds, for setting the level to about 70 dB.
Use this file First to set your Amplifier volume level, and then run the incremental frequency tones.
The zip file containing the test tones, even (thoughtfully) includes a test Graph paper that you can print and use, when conducting the tests.
I would encourage you to run the test tones, even if you do not have a calibrated mic. The Room Resonances will be so prominently loud that you will very easily be able to identify the resonant frequencies.
I have been using this zipped files for over a decade, and continue to strongly recommend its download and use. A BIG THANKS! to the RealTraps folks for putting it all together and offering it for free!