Reply to thread

Message

<blockquote data-quote="Ivan Beaver" data-source="post: 147720" data-attributes="member: 30">Re: FIR filtersJust to add a &quot;different twist&quot; to the whole eq/phase issue.Just because an eq adjust the phase DOES NOT always mean it is a bad thing.If it is in a &quot;problem area&quot; then it could possibly help to have an eq that does not adjust phase.HOWEVER-in many cases (where there is no overlap-multi arrivals etc) when you adjust the eq you ACTUALLY HELP the phase response to be flatter.So &quot;automatically&quot; assuming that FIR is the &quot;ultimate answer&quot; is going down the wrong road.As usual-it depends, and when a proper speaker design is done, you do NOT need FIR filters.&nbsp; Because there is nothing to &quot;fix&quot;.Or put another way-often &quot;fancy filters&quot; (of all types) are trying to fix something that is basically a bad/incorrect design.If it was a better design, then you don&#039;t need the &quot;fancy filters&quot;.A &quot;perfect speaker&quot; will have a phase response that resembles a high and low pass filter.Once you get past that-you are dealing with compromised designs.&nbsp; Some need more help than others.And something that is often overlooked, is while the &quot;fancy filters&quot; may appear to fix the issues in one listening position, WHAT ABOUT ALL THE OTHERS?????&nbsp; In many cases they get worse.But I guess as long as the measurement position is happy-then all is well.But in many cases the GOAL should be to provide THE SAME response to all listeners.</blockquote>

[QUOTE="Ivan Beaver, post: 147720, member: 30"] Re: FIR filters Just to add a "different twist" to the whole eq/phase issue. Just because an eq adjust the phase DOES NOT always mean it is a bad thing. If it is in a "problem area" then it could possibly help to have an eq that does not adjust phase. HOWEVER-in many cases (where there is no overlap-multi arrivals etc) when you adjust the eq you ACTUALLY HELP the phase response to be flatter. So "automatically" assuming that FIR is the "ultimate answer" is going down the wrong road. As usual-it depends, and when a proper speaker design is done, you do NOT need FIR filters. Because there is nothing to "fix". Or put another way-often "fancy filters" (of all types) are trying to fix something that is basically a bad/incorrect design. If it was a better design, then you don't need the "fancy filters". A "perfect speaker" will have a phase response that resembles a high and low pass filter. Once you get past that-you are dealing with compromised designs. Some need more help than others. And something that is often overlooked, is while the "fancy filters" may appear to fix the issues in one listening position, WHAT ABOUT ALL THE OTHERS????? In many cases they get worse. But I guess as long as the measurement position is happy-then all is well. But in many cases the GOAL should be to provide THE SAME response to all listeners. [/QUOTE]

Verification