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Enclosure Design & Construction
Need some help tweaking ports on test box.
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<blockquote data-quote="Scotnemily" data-source="post: 8594086" data-attributes="member: 673497"><p>Hi, I am in the process of putting together a sub and box combo for my car. After all the help I have gotten here I am probably going to end up with 1 15" SSA Icon. But until I get that taken care of, I wanted to build a different box for my current subs I am using. Right now they are in a sealed box each seeing 1 cuft. The sound quality is really good, music with a tight drum beat hits hard. Right now though I am not getting much sound below 30hz. I can play a 30hz test tone and it is loud, but it drops off quickly after that. Some of it could be a xover in my factory system cutting out the lower bass. not sure yet on that. There is no way I can adjust that if it is the case. I know the subs them self can get really low as I have used them in the past and never had any issues there. I was thinking it may be the box. While it is in spec for the subs, it is smaller than I have used before for them. And on the graph from the manufacture it would start falling off around the 30hz range. I want to build a ported enclosure for them to see if I am happy with the output. Who knows I might not even change anything else if I am. I will post the specs for the subs, manufacture recommended enclosure, and my box with the specs from BassBox.</p><p></p><p>Here are the specs for the subs.</p><p></p><p>Normal Power Handling 300W rms</p><p></p><p>Voice Coil Diameter 3”</p><p></p><p>Voice Coil Type / Former edge wound/Kapton</p><p></p><p>Resonant Frequency 43Hz</p><p></p><p>Qts-Total Damping 0.52</p><p></p><p>Qms- Mechanical Damping 2.51</p><p></p><p>Qes- Electromagnetic Damping 0.66</p><p></p><p>Vas- Equivalent Compliance Volume 43.97 Liter</p><p></p><p>DC Resistance of V.C. 4Ω / 8Ω</p><p></p><p>Sensitivity(SPL at 1W) 89.31 dB</p><p></p><p>Linear Excursion ±5.5mm</p><p></p><p>Peak to Peak Excursion ±13mm</p><p></p><p>Mms- Total Mass 114.7 grams</p><p></p><p>Sd- Piston Area 0.0512 sqM</p><p></p><p>Bl- Magnet Product 13.74 TM</p><p></p><p>Diaphragm Material carbon fiber/Nomex honeycomb</p><p></p><p>Basket Material cast aluminum</p><p></p><p>Net Weight 24.18lb</p><p></p><p>Dimensions 12.27” dia. X 4.75” H</p><p></p><p>Mounting Diameter 11.125” dia.</p><p></p><p>Here is the manufacture recommended box.</p><p></p><p>Basic working dimensions for thePRO12</p><p></p><p>Outer Diameter 12 9/32”</p><p></p><p>Mounting Hole Diameter 11 1/8”</p><p></p><p>Mounting Depth(from bottom of top ring) 4 1/4”</p><p></p><p>Speaker Displacement .098 cubic feet</p><p></p><p>Inside Volume 1.50 cubic feet</p><p></p><p>Internal Box Dimensions (LxWxD)</p><p></p><p>23 1/16” x 14 1/4” x 8 13/16”</p><p></p><p>Port Length 11 1/16”</p><p></p><p>Port Diameter 4” ID</p><p></p><p>Port Displacement .08 cubic foot.</p><p></p><p>Here is what I got from Bassbox.</p><p></p><p><img src="https://i.imgur.com/6cZfTaC.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>For my port I think the two 4" ports would have an area around 25cuin my slot port has a little over 26 cuin</p><p></p><p>is that enough? Also I am worried the port is to narrow, should I go a little wider? I can post a image of the 3d model of the box too if that helps. I just want to make sure the specs look good for these subs or if I have overlooked something obvious. Thanks!!</p></blockquote><p></p>
[QUOTE="Scotnemily, post: 8594086, member: 673497"] Hi, I am in the process of putting together a sub and box combo for my car. After all the help I have gotten here I am probably going to end up with 1 15" SSA Icon. But until I get that taken care of, I wanted to build a different box for my current subs I am using. Right now they are in a sealed box each seeing 1 cuft. The sound quality is really good, music with a tight drum beat hits hard. Right now though I am not getting much sound below 30hz. I can play a 30hz test tone and it is loud, but it drops off quickly after that. Some of it could be a xover in my factory system cutting out the lower bass. not sure yet on that. There is no way I can adjust that if it is the case. I know the subs them self can get really low as I have used them in the past and never had any issues there. I was thinking it may be the box. While it is in spec for the subs, it is smaller than I have used before for them. And on the graph from the manufacture it would start falling off around the 30hz range. I want to build a ported enclosure for them to see if I am happy with the output. Who knows I might not even change anything else if I am. I will post the specs for the subs, manufacture recommended enclosure, and my box with the specs from BassBox. Here are the specs for the subs. Normal Power Handling 300W rms Voice Coil Diameter 3” Voice Coil Type / Former edge wound/Kapton Resonant Frequency 43Hz Qts-Total Damping 0.52 Qms- Mechanical Damping 2.51 Qes- Electromagnetic Damping 0.66 Vas- Equivalent Compliance Volume 43.97 Liter DC Resistance of V.C. 4Ω / 8Ω Sensitivity(SPL at 1W) 89.31 dB Linear Excursion ±5.5mm Peak to Peak Excursion ±13mm Mms- Total Mass 114.7 grams Sd- Piston Area 0.0512 sqM Bl- Magnet Product 13.74 TM Diaphragm Material carbon fiber/Nomex honeycomb Basket Material cast aluminum Net Weight 24.18lb Dimensions 12.27” dia. X 4.75” H Mounting Diameter 11.125” dia. Here is the manufacture recommended box. Basic working dimensions for thePRO12 Outer Diameter 12 9/32” Mounting Hole Diameter 11 1/8” Mounting Depth(from bottom of top ring) 4 1/4” Speaker Displacement .098 cubic feet Inside Volume 1.50 cubic feet Internal Box Dimensions (LxWxD) 23 1/16” x 14 1/4” x 8 13/16” Port Length 11 1/16” Port Diameter 4” ID Port Displacement .08 cubic foot. Here is what I got from Bassbox. [IMG]https://i.imgur.com/6cZfTaC.jpg[/IMG] For my port I think the two 4" ports would have an area around 25cuin my slot port has a little over 26 cuin is that enough? Also I am worried the port is to narrow, should I go a little wider? I can post a image of the 3d model of the box too if that helps. I just want to make sure the specs look good for these subs or if I have overlooked something obvious. Thanks!! [/QUOTE]
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