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Enclosure Design & Construction
4th order bandpass box. Yes or no?
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<blockquote data-quote="Bug420247" data-source="post: 8832268" data-attributes="member: 688229"><p>Thank for the advice. I have to wire the way it is in order to have 1ohm at the amp. So here’s what I really after I need to know my port size will be for a rectangle port. As well as the depth of the port. On speaker box with these dimensions: </p><p>length 41.5 in. </p><p>Bottom width 17 in.</p><p>Top width 14 in.</p><p>Height 20 in.</p><p></p><p>Here are all the specs that I have for the driver. And I have two of them.</p><ul> <li data-xf-list-type="ul"><p style="text-align: left">Cutout Diameter: 11.65” inches</p> </li> <li data-xf-list-type="ul"><p style="text-align: left">Mounting Depth: 8.66” inches</p> </li> <li data-xf-list-type="ul"><p style="text-align: left">25mm T-Yoke + 15mm Washer</p> </li> <li data-xf-list-type="ul"><p style="text-align: left">Vented/Ported Enclosure Volume: 2.12-2.83 Cubic Feet</p> </li> <li data-xf-list-type="ul"><p style="text-align: left">Frequency response: 37 Hz - 1K kHz</p> </li> <li data-xf-list-type="ul"><p style="text-align: left">Sensitivity: 85.9 dB</p> </li> <li data-xf-list-type="ul"><p style="text-align: left">XMAX: 30 MM</p> </li> <li data-xf-list-type="ul"> <table style='width: 100%'><tr><td><p style="text-align: center">Re</p> </td><td><p style="text-align: center">1.7 Ohm</p> </td><td><p style="text-align: center">Electrical voice coil resistance at DC</p> </td></tr><tr><td><p style="text-align: center">Fo</p> </td><td><p style="text-align: center">37.649 Hz</p> </td><td><p style="text-align: center">Drive resonance frequency</p> </td></tr><tr><td><p style="text-align: center"><strong>Mechanical Parameters (Using Laser)</strong></p> </td><td></td><td></td></tr><tr><td><p style="text-align: center">Mms</p> </td><td><p style="text-align: center">244.251 g</p> </td><td><p style="text-align: center">Mechanical mass of drive diaphragm assembly including air load and voice coil</p> </td></tr><tr><td><p style="text-align: center">Mmd (Sd)</p> </td><td><p style="text-align: center">238.365g</p> </td><td><p style="text-align: center">Mechanical mass of voice coil and diaphragm without air load</p> </td></tr><tr><td><p style="text-align: center">Cms</p> </td><td><p style="text-align: center">73.163 mm/N</p> </td><td><p style="text-align: center">Mechanical compliance of drive suspension</p> </td></tr><tr><td><p style="text-align: center">Bl</p> </td><td><p style="text-align: center">14.252 N/A</p> </td><td><p style="text-align: center">Force factor (Bl product)</p> </td></tr><tr><td><p style="text-align: center"><strong>Loss Factors</strong></p> </td><td></td><td></td></tr><tr><td><p style="text-align: center">Qms</p> </td><td><p style="text-align: center">3.627</p> </td><td><p style="text-align: center">Mechanical Q-factor of of drive in free air considering Rms only</p> </td></tr><tr><td><p style="text-align: center">Qes</p> </td><td><p style="text-align: center">0.414</p> </td><td><p style="text-align: center">Electrical Q-factor of drive in free air considering Re only</p> </td></tr><tr><td><p style="text-align: center">Qts</p> </td><td><p style="text-align: center">0.357</p> </td><td><p style="text-align: center">Total Q-factor considering Re and Rms only</p> </td></tr><tr><td><p style="text-align: center"><strong>Other Parameters</strong></p> </td><td></td><td></td></tr><tr><td><p style="text-align: center">Vas</p> </td><td><p style="text-align: center">23.090</p> </td><td><p style="text-align: center">Equivalent air volume of suspension</p> </td></tr><tr><td><p style="text-align: center">n0</p> </td><td><p style="text-align: center">0.246%</p> </td><td><p style="text-align: center">Reference efficiency (2 pi-radiation using Re)</p> </td></tr><tr><td><p style="text-align: center">Sd</p> </td><td><p style="text-align: center">47.144 cm²</p> </td><td><p style="text-align: center">Diaphragm area</p> </td></tr><tr><td><p style="text-align: center">SPL</p> </td><td><p style="text-align: center">85.9dB</p> </td><td><p style="text-align: center">sensitivity </p> </td></tr></table> <br /> <br /> <p style="text-align: left"><strong>Detailed Info:</strong></p> <br /> </li> <li data-xf-list-type="ul">Gap Plate Inside Diameter: 85.5mm (3.37 inches)</li> <li data-xf-list-type="ul">Gap Plate Outside Diameter: 210mm (8.27 inches)</li> <li data-xf-list-type="ul">Gap Plate Thickness: 15mm (0.59 inch)</li> <li data-xf-list-type="ul">Yoke Outside Diameter:210mm (8.27 inches)Yoke Thickness: 25mm (0.98 inches)</li> <li data-xf-list-type="ul">Yoke Pole Diameter: 73.9mm (2.91 inches)</li> </ul></blockquote><p></p>
[QUOTE="Bug420247, post: 8832268, member: 688229"] Thank for the advice. I have to wire the way it is in order to have 1ohm at the amp. So here’s what I really after I need to know my port size will be for a rectangle port. As well as the depth of the port. On speaker box with these dimensions: length 41.5 in. Bottom width 17 in. Top width 14 in. Height 20 in. Here are all the specs that I have for the driver. And I have two of them. [LIST] [*][LEFT]Cutout Diameter: 11.65” inches[/LEFT] [*][LEFT]Mounting Depth: 8.66” inches[/LEFT] [*][LEFT]25mm T-Yoke + 15mm Washer[/LEFT] [*][LEFT]Vented/Ported Enclosure Volume: 2.12-2.83 Cubic Feet[/LEFT] [*][LEFT]Frequency response: 37 Hz - 1K kHz[/LEFT] [*][LEFT]Sensitivity: 85.9 dB[/LEFT] [*][LEFT]XMAX: 30 MM[/LEFT] [*][TABLE] [TR] [TD][CENTER]Re[/CENTER][/TD] [TD][CENTER]1.7 Ohm[/CENTER][/TD] [TD][CENTER]Electrical voice coil resistance at DC[/CENTER][/TD] [/TR] [TR] [TD][CENTER]Fo[/CENTER][/TD] [TD][CENTER]37.649 Hz[/CENTER][/TD] [TD][CENTER]Drive resonance frequency[/CENTER][/TD] [/TR] [TR] [TD][CENTER][B]Mechanical Parameters (Using Laser)[/B][/CENTER][/TD] [TD][/TD] [TD][/TD] [/TR] [TR] [TD][CENTER]Mms[/CENTER][/TD] [TD][CENTER]244.251 g[/CENTER][/TD] [TD][CENTER]Mechanical mass of drive diaphragm assembly including air load and voice coil[/CENTER][/TD] [/TR] [TR] [TD][CENTER]Mmd (Sd)[/CENTER][/TD] [TD][CENTER]238.365g[/CENTER][/TD] [TD][CENTER]Mechanical mass of voice coil and diaphragm without air load[/CENTER][/TD] [/TR] [TR] [TD][CENTER]Cms[/CENTER][/TD] [TD][CENTER]73.163 mm/N[/CENTER][/TD] [TD][CENTER]Mechanical compliance of drive suspension[/CENTER][/TD] [/TR] [TR] [TD][CENTER]Bl[/CENTER][/TD] [TD][CENTER]14.252 N/A[/CENTER][/TD] [TD][CENTER]Force factor (Bl product)[/CENTER][/TD] [/TR] [TR] [TD][CENTER][B]Loss Factors[/B][/CENTER][/TD] [TD][/TD] [TD][/TD] [/TR] [TR] [TD][CENTER]Qms[/CENTER][/TD] [TD][CENTER]3.627[/CENTER][/TD] [TD][CENTER]Mechanical Q-factor of of drive in free air considering Rms only[/CENTER][/TD] [/TR] [TR] [TD][CENTER]Qes[/CENTER][/TD] [TD][CENTER]0.414[/CENTER][/TD] [TD][CENTER]Electrical Q-factor of drive in free air considering Re only[/CENTER][/TD] [/TR] [TR] [TD][CENTER]Qts[/CENTER][/TD] [TD][CENTER]0.357[/CENTER][/TD] [TD][CENTER]Total Q-factor considering Re and Rms only[/CENTER][/TD] [/TR] [TR] [TD][CENTER][B]Other Parameters[/B][/CENTER][/TD] [TD][/TD] [TD][/TD] [/TR] [TR] [TD][CENTER]Vas[/CENTER][/TD] [TD][CENTER]23.090[/CENTER][/TD] [TD][CENTER]Equivalent air volume of suspension[/CENTER][/TD] [/TR] [TR] [TD][CENTER]n0[/CENTER][/TD] [TD][CENTER]0.246%[/CENTER][/TD] [TD][CENTER]Reference efficiency (2 pi-radiation using Re)[/CENTER][/TD] [/TR] [TR] [TD][CENTER]Sd[/CENTER][/TD] [TD][CENTER]47.144 cm²[/CENTER][/TD] [TD][CENTER]Diaphragm area[/CENTER][/TD] [/TR] [TR] [TD][CENTER]SPL[/CENTER][/TD] [TD][CENTER]85.9dB[/CENTER][/TD] [TD][CENTER]sensitivity [/CENTER][/TD] [/TR] [/TABLE] [LEFT][B]Detailed Info:[/B][/LEFT] [*]Gap Plate Inside Diameter: 85.5mm (3.37 inches) [*]Gap Plate Outside Diameter: 210mm (8.27 inches) [*]Gap Plate Thickness: 15mm (0.59 inch) [*]Yoke Outside Diameter:210mm (8.27 inches)Yoke Thickness: 25mm (0.98 inches) [*]Yoke Pole Diameter: 73.9mm (2.91 inches) [/LIST] [/QUOTE]
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4th order bandpass box. Yes or no?
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