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Car Audio Help
Enclosure Design & Construction
To all current enclosure designers: a proposal
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<blockquote data-quote="PV Audio" data-source="post: 6485420" data-attributes="member: 554493"><p><span style="color: Red"><strong>POTENTIAL APPLICANTS: READ THE FOLLOWING!!!</strong></span></p><p></p><p>Okay, we need 2/3 more people to sign up for my number of 8. Once we hit 8, I'll post the requirements. I have decided to make it a bit more difficult just to weed out some people using a stolen program who sell things with port lengths of 50" for 1 cube boxes:</p><p></p><p>1. As stated, the design is for a simple slot ported box. However, I have decided to change something. Your design will be rated out of 100 points. I will normalize everyone's scores to the highest score (if 1.87/2 cubic feet is the closest, then that's the highest score. Please be more accurate than that though //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif) to guarantee a winner, as long as at least 3 peoplea re within 75% accuracy. This portion is as I've stated so far: build a simple slot ported enclosure to a given tuning and enclosure volume. This portion will be rated out of <strong><span style="color: Red">75</span></strong> points.</p><p></p><p>2. The second part is partially subjective and mostly objective. The enclosure will still be a simple slot ported box, but I want you to take into account a specific driver when you do your design. This way, if you're running an AudioPulse REVO in the same enclosure that can fit a Sony Xplod, you will be able to differentiate the enclosures. This is also done to showcase people taking bracing and other internal structures into account. More importantly, it proves to me that you have intuition about enclosure design and aren't just using an online calculator. You could get away with 8sq in of port on that Sony, but the REVO would compress that port into a pancake. I will post the driver when I post the enclosure specs. Assume that the driver is being given rated power and is again operating in free space. This will probably require you to at least glance at the T/S parameters of the speaker. This is rated out of <span style="color: Red"><strong>25</strong></span> points.</p><p></p><p>NOTE: Parts 1 &amp; 2 are for the SAME design. You take into account BOTH. I'm just grading your accuracy for 75% and your intuition for 25%.</p><p></p><p>Finally, I am adding another section to the test entirely that is 100% optional. This section is 100% subjective and is going to be based on a single speaker in any enclosure you want at any size you want at any tuning you want (if it needs to be ported). The idea here is to show that instead of just being able to work a simple formula, you understand how speakers work in enclosures. Assume for this portion, the system will be operating in a large room with damped floors and walls, so no reflections need to be taken into account. Baffle mechanics, however will be. That means you need to consider baffle step, lobing and diffraction among other things. Since I know many of you guys aren't even interested in things this complicated, that's why this is 100% optional and is worth $15 for first and $5 for second. No third place will be judged. I will list the speaker to use when I list all the other parameters. Assume that the driver has an ideal filter and you only need to optimize the enclosure to the speaker and not any internal circuitry. This will be for an obscure driver that many of you may have heard of, but that's only to ensure that there are no published ideal parameters. You'll have to do that yourself. I just have to ask that if you are uncomfortable with this portion, then don't bother doing it. Don't waste your time learning what takes years over the course of a week. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif</p><p></p><p>Note that the first portion's driver being used for this is well known, but may NOT be necessarily car audio drivers. That way, no one has an inherent advantage such as if Incriminator enters and I choose DP12 or TeamPsi send in a design for a SX15.</p><p></p><p>So, that's basically it. If you want to enter both, please let me know. To make it fair to everyone who does car audio, you can only enter the optional portion if you're doing the slot ported design as well. That way we don't get any guys coming over from avsforum or diyaudio and stealing my 15 dollars. //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif</p><p></p><p>-Dave //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif</p></blockquote><p></p>
[QUOTE="PV Audio, post: 6485420, member: 554493"] [COLOR=Red][B]POTENTIAL APPLICANTS: READ THE FOLLOWING!!![/B][/COLOR] Okay, we need 2/3 more people to sign up for my number of 8. Once we hit 8, I'll post the requirements. I have decided to make it a bit more difficult just to weed out some people using a stolen program who sell things with port lengths of 50" for 1 cube boxes: 1. As stated, the design is for a simple slot ported box. However, I have decided to change something. Your design will be rated out of 100 points. I will normalize everyone's scores to the highest score (if 1.87/2 cubic feet is the closest, then that's the highest score. Please be more accurate than that though [IMG]//content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif[/IMG]) to guarantee a winner, as long as at least 3 peoplea re within 75% accuracy. This portion is as I've stated so far: build a simple slot ported enclosure to a given tuning and enclosure volume. This portion will be rated out of [B][COLOR=Red]75[/COLOR][/B] points. 2. The second part is partially subjective and mostly objective. The enclosure will still be a simple slot ported box, but I want you to take into account a specific driver when you do your design. This way, if you're running an AudioPulse REVO in the same enclosure that can fit a Sony Xplod, you will be able to differentiate the enclosures. This is also done to showcase people taking bracing and other internal structures into account. More importantly, it proves to me that you have intuition about enclosure design and aren't just using an online calculator. You could get away with 8sq in of port on that Sony, but the REVO would compress that port into a pancake. I will post the driver when I post the enclosure specs. Assume that the driver is being given rated power and is again operating in free space. This will probably require you to at least glance at the T/S parameters of the speaker. This is rated out of [COLOR=Red][B]25[/B][/COLOR] points. NOTE: Parts 1 & 2 are for the SAME design. You take into account BOTH. I'm just grading your accuracy for 75% and your intuition for 25%. Finally, I am adding another section to the test entirely that is 100% optional. This section is 100% subjective and is going to be based on a single speaker in any enclosure you want at any size you want at any tuning you want (if it needs to be ported). The idea here is to show that instead of just being able to work a simple formula, you understand how speakers work in enclosures. Assume for this portion, the system will be operating in a large room with damped floors and walls, so no reflections need to be taken into account. Baffle mechanics, however will be. That means you need to consider baffle step, lobing and diffraction among other things. Since I know many of you guys aren't even interested in things this complicated, that's why this is 100% optional and is worth $15 for first and $5 for second. No third place will be judged. I will list the speaker to use when I list all the other parameters. Assume that the driver has an ideal filter and you only need to optimize the enclosure to the speaker and not any internal circuitry. This will be for an obscure driver that many of you may have heard of, but that's only to ensure that there are no published ideal parameters. You'll have to do that yourself. I just have to ask that if you are uncomfortable with this portion, then don't bother doing it. Don't waste your time learning what takes years over the course of a week. [IMG]//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif[/IMG] Note that the first portion's driver being used for this is well known, but may NOT be necessarily car audio drivers. That way, no one has an inherent advantage such as if Incriminator enters and I choose DP12 or TeamPsi send in a design for a SX15. So, that's basically it. If you want to enter both, please let me know. To make it fair to everyone who does car audio, you can only enter the optional portion if you're doing the slot ported design as well. That way we don't get any guys coming over from avsforum or diyaudio and stealing my 15 dollars. [IMG]//content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif[/IMG] -Dave [IMG]//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif[/IMG] [/QUOTE]
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To all current enclosure designers: a proposal
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