Do you have access to a decent laptop? One that you could install software on, and one that has a good-quality USB port?
If so, I'd recommend you download REW (Room EQ Wizard), which you will find at: https://www.roomeqwizard.com/ I would also recommend that you purchase a calibrated microphone, I bought this one, I think it's available from Amazon: https://www.minidsp.com/products/acoustic-measurement/umik-1
Having that combination helped me position and tune my subwoofers, as well helped me position and install bass traps in my "man cave", which had terrible low frequency problems, adding a "single note" to the bass, regardless of what the source material contained.
Good luck!
If so, I'd recommend you download REW (Room EQ Wizard), which you will find at: https://www.roomeqwizard.com/ I would also recommend that you purchase a calibrated microphone, I bought this one, I think it's available from Amazon: https://www.minidsp.com/products/acoustic-measurement/umik-1
Having that combination helped me position and tune my subwoofers, as well helped me position and install bass traps in my "man cave", which had terrible low frequency problems, adding a "single note" to the bass, regardless of what the source material contained.
Good luck!