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Re: Pro 2 AD Conversion - why high pass at 30hz ?Hello Gents,I thought I should get involved in this thread as there were some direct questions being asked of us. So here goes with an answer......The 30Hz filter is placed pre-A/D converter and is basically there to filter out sub-harmonic frequencies that have little or no musical relevance. The A/D converters we use in our DL431 stage boxes will convert signals down to 4Hz and during the development of the XL8 we discovered that these frequencies eat up A/D converter headroom even though they are not actually 'heard'. We found that the analogue 30Hz filter increased the usable headroom in the A/D converter and removed low frequency signals picked up by microphones on stage through vibration and physical transmission through the diaphragm of the microphones etc. Of course the 30Hz filter can be bypassed at any time on the DL431 splitters as there are obviously some signals that would extend below the 30Hz range.The A/D conversion stage in the other stage boxes (DL251, DL351 etc) are specified as 20Hz-20Khz processes and do not have a switchable HPF on the analogue side of the A/D converters.I hope this answers the original question. If there's anything else I can help with just let me know.Thanks,
Re: Pro 2 AD Conversion - why high pass at 30hz ?
Hello Gents,
I thought I should get involved in this thread as there were some direct questions being asked of us. So here goes with an answer......
The 30Hz filter is placed pre-A/D converter and is basically there to filter out sub-harmonic frequencies that have little or no musical relevance. The A/D converters we use in our DL431 stage boxes will convert signals down to 4Hz and during the development of the XL8 we discovered that these frequencies eat up A/D converter headroom even though they are not actually 'heard'. We found that the analogue 30Hz filter increased the usable headroom in the A/D converter and removed low frequency signals picked up by microphones on stage through vibration and physical transmission through the diaphragm of the microphones etc. Of course the 30Hz filter can be bypassed at any time on the DL431 splitters as there are obviously some signals that would extend below the 30Hz range.
The A/D conversion stage in the other stage boxes (DL251, DL351 etc) are specified as 20Hz-20Khz processes and do not have a switchable HPF on the analogue side of the A/D converters.
I hope this answers the original question. If there's anything else I can help with just let me know.
Thanks,
