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SB1000e out-of-band EQ
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<blockquote data-quote="Curtis H List (Too Tall)" data-source="post: 17521" data-attributes="member: 160"><p>Re: SB1000e out-of-band EQ</p><p></p><p></p><p></p><p></p><p></p><p>Hi</p><p></p><p>IMO symmetrical ELECTRICAL high-pass and Low-pass are in most cases wrong.</p><p></p><p>The reason being the outputs of the two drivers are typically NOT symmetrical!</p><p></p><p>If it is fine, but mostly it is not.</p><p></p><p></p><p></p><p>It is NEVER so for the highs and the mids. You have a better shot with blending subs and full range since you might have the same roll off rate.</p><p></p><p></p><p></p><p>If the full range speaker has a port and drops off at 24dB per octave you need the same from the sub.</p><p></p><p>Let's say that the full range goes low enough flat that a LR24 looks like it should.</p><p></p><p>If the sub's natural roll off is 12dB per octave you need to use a 12dB low pass on the sub to balance things out.</p><p></p><p>This is a LONG way from symmetrical!</p><p></p><p></p><p></p><p>In all cases I look for an ACUOSTIC TARGET and do whatever I need to do in the electrical world to make my result look like that target.</p><p></p><p>That is how my modeling software is.</p><p></p><p></p><p></p><p>As for ''Out of Band'' EQ, that is used to make the drivers perform flat so that a simple low-pass will give you a text book result when you measure.</p><p></p><p></p><p></p><p>Another problem it is used to fix is the huge sharp peaks you get from using metal (or other stiff material) in HiFi drivers.</p><p></p><p>A 7'' metal woofer may start to roll off around 2kHz, but has a huge peak at 6kHz where its ''Breakup Mode'' happens. You need to put a sharp parametric EQ on that peak to knock it down or you will hear it coming from the woofer.</p></blockquote><p></p>
[QUOTE="Curtis H List (Too Tall), post: 17521, member: 160"] Re: SB1000e out-of-band EQ Hi IMO symmetrical ELECTRICAL high-pass and Low-pass are in most cases wrong. The reason being the outputs of the two drivers are typically NOT symmetrical! If it is fine, but mostly it is not. It is NEVER so for the highs and the mids. You have a better shot with blending subs and full range since you might have the same roll off rate. If the full range speaker has a port and drops off at 24dB per octave you need the same from the sub. Let's say that the full range goes low enough flat that a LR24 looks like it should. If the sub's natural roll off is 12dB per octave you need to use a 12dB low pass on the sub to balance things out. This is a LONG way from symmetrical! In all cases I look for an ACUOSTIC TARGET and do whatever I need to do in the electrical world to make my result look like that target. That is how my modeling software is. As for ''Out of Band'' EQ, that is used to make the drivers perform flat so that a simple low-pass will give you a text book result when you measure. Another problem it is used to fix is the huge sharp peaks you get from using metal (or other stiff material) in HiFi drivers. A 7'' metal woofer may start to roll off around 2kHz, but has a huge peak at 6kHz where its ''Breakup Mode'' happens. You need to put a sharp parametric EQ on that peak to knock it down or you will hear it coming from the woofer. [/QUOTE]
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