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Subwoofer Performance Verification
There are two methods of verifying that the phase relationship between the HM-1S and its subwoofer. One method is
free field, the other is a ground plane measurement in half space.
Free Field:
Place the HM-1S directly above and coplanar to the subwoofer as pictured below:
Place a calibrated measurement microphone 1 meter, on axis to the tweeter of the HM-1S as pictured below:
Using the noise or other broadband test signal, perform a transfer function of the HM-1S. Start with the subwoofer
disconnected.