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<blockquote data-quote="Art Welter" data-source="post: 204174" data-attributes="member: 52">Timo,The completely unprocessed response of my most recent design, the SynTripP has phase near as flat as your allpass filtered response.When processed with the usual 24 dB per octave filters, the SynTripP and sub has the expected phase &quot;wrap&quot; of around 1080 degrees, but after 40 years of going between headphones with flat phase, and 3 and 4 way systems with as much as 1440 degrees of phase shift, I can&#039;t tell the difference from a phase aspect.I bought a BSS BLU 100 specifically to use the FIR filters, but after listening to Merlijn van Veen&#039;s recording in which he manipulated the phase from flat to several thousand degrees of shift, I realized I am incapable of hearing the difference, even in an A/B test using flat phase headphones.Someday I might play around with FIR filters, but I don&#039;t expect my hearing will change, so it will be a purely academic pursuit.Art</blockquote>

[QUOTE="Art Welter, post: 204174, member: 52"] Timo, The completely unprocessed response of my most recent design, the SynTripP has phase near as flat as your allpass filtered response. When processed with the usual 24 dB per octave filters, the SynTripP and sub has the expected phase "wrap" of around 1080 degrees, but after 40 years of going between headphones with flat phase, and 3 and 4 way systems with as much as 1440 degrees of phase shift, I can't tell the difference from a phase aspect. I bought a BSS BLU 100 specifically to use the FIR filters, but after listening to Merlijn van Veen's recording in which he manipulated the phase from flat to several thousand degrees of shift, I realized I am incapable of hearing the difference, even in an A/B test using flat phase headphones. Someday I might play around with FIR filters, but I don't expect my hearing will change, so it will be a purely academic pursuit. Art [/QUOTE]

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