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Coaxial Wedge Collaboration
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<blockquote data-quote="Curtis H List (Too Tall)" data-source="post: 25109" data-attributes="member: 160"><p>Re: Coaxial Wedge Collaboration</p><p></p><p></p><p></p><p>Just to be clear the reflection problem on the 12CN680 is not a “BMS” problem. It is the same problem you will have to deal with no matter what brand of driver you use.</p><p>In the case of the BMS 12CN680 there is a horn in front of the woofer and the diaphragm for the 1” compression driver is back by the woofer magnet.</p><p></p><p>Any driver with this physical setup will have the same reflection problem no matter the brand.</p><p></p><p>There are only two ways to stop the reflection-</p><p>Soak it up by putting sound absorbing material on the back of the horn.</p><p></p><p>Move the high-pass xover to 800Hz or below. (Approximately).</p><p>This puts the reflection problem in the compression driver’s range of operation.</p><p></p><p>Both of these paths have problems.</p><p></p><p>The solution where we move the xover down requires a driver that can handle the lower frequencies. This will not work for any 1” throat compression driver that I know of. Also this requires a horn that can go that low.</p><p></p><p></p><p>In the case of the 12CN680 there is cloth glued to the back of the horn.</p><p>There was not enough room to put in enough material to completely soak up the reflection.</p><p></p><p>The people using it have not had a problem with it.</p><p>Some ignore the slight bump and others use some EQ.</p><p>NOTE: reflections are notorious for being stubborn when you try and use EQ to straighten them out.</p><p></p><p></p><p> </p><p></p><p>I had a P-Audio 60 degree here that I measured.</p><p>Using the same driver on several different horns I had it was obvious that the P-Audio horn caused a large mid range bump that the other horns did not cause. I would stay away from their horns.</p><p> </p><p></p><p></p><p>Since I work with BMS all the time I would prefer you use something other than BMS so I do not have to deal with conflicts of interest.</p><p>In the end I don’t know how much I would be involved.</p><p></p><p>I believe someone mentioned using the entire horn and compression driver in front of the woofer.</p><p>This puts a substantial delay between the compression driver and woofer. This negates one of the big advantages of a coaxial.</p><p>It will still have the reflection, but you may have enough room to deal with it by putting in foam or cloth on the back of the compression driver and horn.</p></blockquote><p></p>
[QUOTE="Curtis H List (Too Tall), post: 25109, member: 160"] Re: Coaxial Wedge Collaboration Just to be clear the reflection problem on the 12CN680 is not a “BMS” problem. It is the same problem you will have to deal with no matter what brand of driver you use. In the case of the BMS 12CN680 there is a horn in front of the woofer and the diaphragm for the 1” compression driver is back by the woofer magnet. Any driver with this physical setup will have the same reflection problem no matter the brand. There are only two ways to stop the reflection- Soak it up by putting sound absorbing material on the back of the horn. Move the high-pass xover to 800Hz or below. (Approximately). This puts the reflection problem in the compression driver’s range of operation. Both of these paths have problems. The solution where we move the xover down requires a driver that can handle the lower frequencies. This will not work for any 1” throat compression driver that I know of. Also this requires a horn that can go that low. In the case of the 12CN680 there is cloth glued to the back of the horn. There was not enough room to put in enough material to completely soak up the reflection. The people using it have not had a problem with it. Some ignore the slight bump and others use some EQ. NOTE: reflections are notorious for being stubborn when you try and use EQ to straighten them out. I had a P-Audio 60 degree here that I measured. Using the same driver on several different horns I had it was obvious that the P-Audio horn caused a large mid range bump that the other horns did not cause. I would stay away from their horns. Since I work with BMS all the time I would prefer you use something other than BMS so I do not have to deal with conflicts of interest. In the end I don’t know how much I would be involved. I believe someone mentioned using the entire horn and compression driver in front of the woofer. This puts a substantial delay between the compression driver and woofer. This negates one of the big advantages of a coaxial. It will still have the reflection, but you may have enough room to deal with it by putting in foam or cloth on the back of the compression driver and horn. [/QUOTE]
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