Since I just registered for an account I can't make a new subject so I'll post it here. I design loudspeakers for a hobby and have a computer dedicated to measurements and crossover design using SoundEasy V13. I've taken many impedance, T/S and frequency measurements over the years and have always measured closely to what the manufacturer states. I just measured a few of the EHQS 8s and got some bad news when I measured their Fs. ED claims 32 hz on their site but here's what I measured:
Sample #1 - 50 hz. Fs, 49 hz. after short break-in
Sample #2 - 51 hz. Fs, 50 hz. after short break-in
Not good
I then grabbed a Dayton RS150 and measured it to see if my measurement setup was acting up. The RS150 was only a few hz. off of Dayton's spec so I know it was good.
To give you an idea of the type of impact this has if you build a single sealed enclosure of 1 ft3 here's what you yield:
32 hz Fs = -3 dB 47 hz, -10 dB 28 hz
50 hz Fs = -3 dB 74 hz, -10 dB 44 hz
This was for a single 2 ohm driver. I'm not sure how the 4 ohm drivers measure.