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The loud speaker is a HI-FI loud speaker with linear behavior for the frequency region that is clinically being assessed, namely 125 to 8000Hz. SO8253-2: 2009 §5.2. The tolerance signal being delivered by a loudspeaker is withing the specs of the ISO regulations. A calibrated box has a linear spectrum within 0,5 dB. No audio booth / fitting room can be calibrated like this. Accuracy of a traditional audio fitting booth is +/- 3 dB (200-3150 Hz).
On a 8 ohm load, the Class D amplifier will produce at a listening position of approximately 5 cm the required 120dB SPL (limited by hardware and software)