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Low Earth Orbit
DIY Audio
Double 15” and Horn Drum Fill
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<blockquote data-quote="Peter Morris" data-source="post: 211628" data-attributes="member: 652"><p>Yep ... the vent area is a bit small. I would suggest unacceptable for a sub application but in this case the 15's are operating up to 600Hz so its unlikely they will be getting full power at 40Hz. I was also hoping that it may provide a bit of Xmax limiting should the engineer do some crazy EQ-ing on the drum monitor ... which does happen.</p><p></p><p>I was also expecting the box could be on top of a double 18 for FOH or side fill applications. Crossed at 80Hz there are no issues with port velocity.</p><p></p><p>If you want more of a general purpose box or a sub I think you should use 4 or more vents and they should be flared, in fact I would use a different port design all together. In this case I wanted to get the two 15's and horn as close as possible to minimise the problems between 2/3 different acoustic sources.</p><p></p><p>The big issue for me was getting the directivity correct and having it sound really nice with great impact - which it does. The box is a little large for this driver and there is a small bump in the frequency response - accordingly there is a -3 dB filter Q2 at 40Hz to get things to perform correctly in the time domain.</p><p></p><p>Edit - Just to add a bit more – by crossing over at 600Hz allowed the use of LF drivers more optimised for sub applications than mid-range performance, and hence more LF output.</p><p></p><p>Often a drum monitor is a 15”+2" horn on top of an 18” sub, however by not crossing over to a sub at 80 – 100 Hz you can save about 5ms of group delay and hopefully give the drummer more impact and have a box that performs very well for this application. I don't think a drum monitor requires extended LF performance.</p><p></p><p>What was also critical for me was ensuring that the driver remained in its linear Xmax range during its intended operation – in this case about +/- 8.5mm (Hvc – Hgap)/2 although the driver is rated +/-12.5mm.</p><p></p><p>By keeping the VC in the magnetic gap you have a better chance of maintain mid-range clarity.</p><p></p><p>The 15hp1060 has a long VC (28.9mm) and is quite efficiency. It also has an FS of 40Hz which is very high for a driver with a rated Xmax of 12.5mm and suited the alignment I wanted – solid performance to 40Hz, but I didn’t want to go lower.</p><p></p><p>Here is the Xmax at 2000 watts with the applied filters -</p></blockquote><p></p>
[QUOTE="Peter Morris, post: 211628, member: 652"] Yep ... the vent area is a bit small. I would suggest unacceptable for a sub application but in this case the 15's are operating up to 600Hz so its unlikely they will be getting full power at 40Hz. I was also hoping that it may provide a bit of Xmax limiting should the engineer do some crazy EQ-ing on the drum monitor ... which does happen. I was also expecting the box could be on top of a double 18 for FOH or side fill applications. Crossed at 80Hz there are no issues with port velocity. If you want more of a general purpose box or a sub I think you should use 4 or more vents and they should be flared, in fact I would use a different port design all together. In this case I wanted to get the two 15's and horn as close as possible to minimise the problems between 2/3 different acoustic sources. The big issue for me was getting the directivity correct and having it sound really nice with great impact - which it does. The box is a little large for this driver and there is a small bump in the frequency response - accordingly there is a -3 dB filter Q2 at 40Hz to get things to perform correctly in the time domain. Edit - Just to add a bit more – by crossing over at 600Hz allowed the use of LF drivers more optimised for sub applications than mid-range performance, and hence more LF output. Often a drum monitor is a 15”+2" horn on top of an 18” sub, however by not crossing over to a sub at 80 – 100 Hz you can save about 5ms of group delay and hopefully give the drummer more impact and have a box that performs very well for this application. I don't think a drum monitor requires extended LF performance. What was also critical for me was ensuring that the driver remained in its linear Xmax range during its intended operation – in this case about +/- 8.5mm (Hvc – Hgap)/2 although the driver is rated +/-12.5mm. By keeping the VC in the magnetic gap you have a better chance of maintain mid-range clarity. The 15hp1060 has a long VC (28.9mm) and is quite efficiency. It also has an FS of 40Hz which is very high for a driver with a rated Xmax of 12.5mm and suited the alignment I wanted – solid performance to 40Hz, but I didn’t want to go lower. Here is the Xmax at 2000 watts with the applied filters - [/QUOTE]
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Double 15” and Horn Drum Fill
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