"Pink_isn't_well" wrote ...
Any free software I can use to open my waves and have them on a dB
scale?

Audacity? GoldWave? likely others?

But it doesn't really mean anything unless you are interested in the
combined frequency response of the speakers AND the microphone.

And even if you had a flat instrumentation mic, you can get any curve
you wish by moving the mic a fraction of an inch in any direction in
your "measurement environment".