I understand how to calibrate the MBM/True Sub using this method.http://forum.hsuresearch.com/showpos...9&postcount=33
What about using the test CD that came with the MBM-12? Does that provide more of a fine tune? I would like to experiemnt with this method but need some clarification of the test proceedure. I split it up into 3 steps.
I asssume this is done with the lowpass implemented at 50 Hz on the True subwoofer and bypassed on the MBM. Are main speakers set to small and the standard 80 Hz lowpass used in the controller for this test?"1) The test CD provided with the MBM-12 has warble tones from 16 Hz up to 200 Hz. Used with a Radio Shack SPL meter, you can finetune your system. Use C weighting and slow mode. The meter is down 12 dB at 16 Hz, 7 dB at 20 Hz, 4 dB at 25 Hz, and 2 dB at 31.5Hz. Add these figures to your meter's readout to get true SPL.2) Place the SPL meter at the listening chair and play the 63 Hz track. Adjustfor 75 dB reading on the SPL meter. Play the tones from the lower limit of your true subwoofer up to 200 Hz and write down the SPL numbers for each frequency. Add the corrections to the appropriate measured results.3) Take the average of the numbers handled by eachof the system - true sub, MBM, and the main speakers. If the subwoofer's average is 5 dB higher than the main speakers, adjust the subwooferdown by 5 dB (you do this by playing a 40 Hz tone, not the SPL reading, and then adjust the volume on the subwoofer to get themeter to read 5 dB less)."
During step 2 is everything off except the true subwoofer?
During step 3 are you taking measurments of the True Subwoofer, MBM and Main speakers separately?
If needed you only adjust the level of True Subwoofer using a 40 Hz tone. You never touch the level of the MBM-12 module once it is set prior to fine tuning the system using the test CD?