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<blockquote data-quote="Michael John" data-source="post: 76140" data-attributes="member: 830">Re: EAW VR21 and VRS12 DSP SettingsHaving learned a lot more on alignment from Timo&#039;s blog and other sources, I checked VRS12/VR21 sub crossover and found I was way off...The VR21 is a bass-reflex cabinet and, at least from theory, has a natural 24 dB/oct (4th order) phase rotation in the low end. Adding a 24 dB/octave Linkwitz/Riley high-pass at 100 Hz results in roughly 48d/oct (8th order) equivalent phase rotation in the low end.The VRS21 on the other hand is flatter in it&#039;s phase at around 100 Hz and the 24 dB/oct Linkwitz/Riley low-pass at 100 Hz doesn&#039;t complement the VR21. From measurement, I found neither the phase nor the phase slope matched at all. (Thankfully it wasn&#039;t sounding too bad.)From measurement and experimentation, I found that the following settings give almost identical phase, roughly between about 70 and 170 Hz. And, most importantly, it sounds better than before.VR21- Already has 5.44ms of delay from linear phase biamping. (See previous posts.)- High-pass: 24 dB/oct Linkwitz/Riley @ 100 Hz.VRS12- Low-pass: 36 dB/oct Butterworth @ 90 Hz.- Delay: 1.5ms- Polarity: normal (i.e. not inverted)</blockquote>

[QUOTE="Michael John, post: 76140, member: 830"] Re: EAW VR21 and VRS12 DSP Settings Having learned a lot more on alignment from Timo's blog and other sources, I checked VRS12/VR21 sub crossover and found I was way off... The VR21 is a bass-reflex cabinet and, at least from theory, has a natural 24 dB/oct (4th order) phase rotation in the low end. Adding a 24 dB/octave Linkwitz/Riley high-pass at 100 Hz results in roughly 48d/oct (8th order) equivalent phase rotation in the low end. The VRS21 on the other hand is flatter in it's phase at around 100 Hz and the 24 dB/oct Linkwitz/Riley low-pass at 100 Hz doesn't complement the VR21. From measurement, I found neither the phase nor the phase slope matched at all. (Thankfully it wasn't sounding too bad.) From measurement and experimentation, I found that the following settings give almost identical phase, roughly between about 70 and 170 Hz. And, most importantly, it sounds better than before. VR21 - Already has 5.44ms of delay from linear phase biamping. (See previous posts.) - High-pass: 24 dB/oct Linkwitz/Riley @ 100 Hz. VRS12 - Low-pass: 36 dB/oct Butterworth @ 90 Hz. - Delay: 1.5ms - Polarity: normal (i.e. not inverted) [/QUOTE]

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