ris8_allo_zen0 Posted February 15, 2007 Report Share Posted February 15, 2007 Hi all,I've tested the filter response of my MBSID with a tool made by me (see this post: http://www.midibox.org/forum/index.php?topic=8548.0), using LP mode, no resonance and cutoff from 0 to 127. The results are in the PDF attached here.I have some doubts about the 1dB loss on all frequencies when the filter is active. Is it normal or it's a fault of my 6581R4 ? I can hear the difference and it's quite annoying for me... or at least for my unexperienced ears...I made that program just for these kind of tests on a simple PC, hoping it'll be useful to do some diagnostics to each own SIDs' filter... tell me what you think!Best regardsEnricoplot_lp.pdf Quote Link to comment Share on other sites More sharing options...
rutgerv Posted March 5, 2007 Report Share Posted March 5, 2007 Hi Enrico,I think this drop of 1dB when the filter is active is done on purpose. It is probably to prevent clipping when the resonance is up. Greetings,Rutger Quote Link to comment Share on other sites More sharing options...
Jaicen Posted March 9, 2007 Report Share Posted March 9, 2007 Can you do a filter response with full resonance??I'm quite surprised by the sweep to be honest, it seem that as you increase the frequency, the filter cutoff becomes less resonant. There's also a big jump between 96 and 127 which i've always heard when sweeping my own 6581. This may account for the logarithmic sounding sweep around that sweet spot (on mine it's about 70-90%). Quote Link to comment Share on other sites More sharing options...
ris8_allo_zen0 Posted March 9, 2007 Author Report Share Posted March 9, 2007 Can you do a filter response with full resonance??I'm quite surprised by the sweep to be honest, it seem that as you increase the frequency, the filter cutoff becomes less resonant. There's also a big jump between 96 and 127 which i've always heard when sweeping my own 6581. This may account for the logarithmic sounding sweep around that sweet spot (on mine it's about 70-90%). Sure I can... but not now, sorry!In the meanwhile, could you post the program's output (or even a graph like I did) so we can compare the results?I'm attaching the Openoffice spreadsheet to generate that graph on my post.Best regardsEnricoplot.zip Quote Link to comment Share on other sites More sharing options...
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