All sorts of filters nm.2   Leave a comment

So again a comparison of 2 processors  . The apex again vs. a xilica . Turned out that both Butterworth and Linkwitz-Riley were identical but again the Bessel filters were different between units . Also the phase filters being allpass first and second order did not match .

First the Bessel high-pass filters :bessel 2hp@1k Bessel 2nd order high-pass filter @ 1kHz (Apex red xilica green)bessel 3hp@1k Bessel 3rd order high-pass filter @ 1kHz (Apex red xilica green)bessel 4hp@1k Bessel 4rt order high-pass filter @ 1kHz (Apex red xilica green)bessel 5hp@1k Bessel 5ft order high-pass filter @ 1kHz (Apex red xilica green)bessel 6hp@1k Bessel 6th order high-pass filter @ 1kHz (Apex red xilica green)bessel 7hp@1k  Bessel 7th order high-pass filter @ 1kHz (Apex red xilica green)bessel 8hp@1k Bessel 8th order high-pass filter @ 1kHz (Apex red xilica green) .

Second the Bessel low-pass filters :bessel 2lp@1k Bessel 2nd order low-pass filter @ 1kHz (Apex red xilica green)bessel 3lp@1k Bessel 3rd order low-pass filter @ 1kHz (Apex red xilica green)bessel 4lp@1k Bessel 4rt order low-pass filter @ 1kHz (Apex red xilica green)bessel 5lp@1k Bessel 5ft order low-pass filter @ 1kHz (Apex red xilica green)bessel 6lp@1k Bessel 6t order low-pass filter @ 1kHz (Apex red xilica green)bessel 7lp@1k Bessel 7th order low-pass filter @ 1kHz (Apex red xilica green)bessel 8lp@1k Bessel 8th order low-pass filter @ 1kHz (Apex red xilica green) .

On the EQ filters there were no noticeable differences . On the phase filters however there were .ap1 @ 1K 90dg   Allpass  1st order filter @ 1kHz (Apex red xilica green) .Allpass 2  1K 2oct Allpass  2nd order filter @ 1kHz 2oct. bandwidth (Apex red xilica green) .Allpass 2  1K 0,33oct Allpass  2nd order filter @ 1kHz 0,33oct. bandwidth (Apex red xilica green) .Allpass 2  100Hz 2oct  Allpass  2nd order filter @ 100Hz 2oct. bandwidth (Apex red xilica green) .Allpass 2  100Hz 0,33oct Allpass  2nd order filter @ 100Hz 0,33oct. bandwidth (Apex red xilica green) .

And finally 2 screenshots of the Apex vs BSS BLU80 vs Xilica .

2apex red bss blue xilica green  Bessel 2nd order high-pass @ 1kHz (Apex red-BSS blue-Xilica green)

apex red bss blue xilica green  Bessel 4rt order high-pass @ 1kHz (Apex red-BSS blue-Xilica green) .

So as far as i know the Xilica comes the closest to what i was taught to be a Bessel filter . The apex seems to take the –3db point on the amplitude as the target for this filter while the BSS takes on the 2nd order bessel filter the   -6db point which should be around –4,5db as the xilica does . The BSS follows the xilica on the 4rt order filter but at the time of the test i was running out of time (i do have a live outside doing measurements so it was time to stop:-).

Posted 05/11/2012 by timobeckmangeluid in Geen categorie

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