{"id":2182,"date":"2018-06-27T15:05:00","date_gmt":"2018-06-27T03:05:00","guid":{"rendered":"https:\/\/hifihq.com.au\/blog\/?p=2182"},"modified":"2019-04-06T15:07:41","modified_gmt":"2019-04-06T02:07:41","slug":"if-the-shoe-fits-matching-the-enclosure-to-the-vehicle","status":"publish","type":"post","link":"https:\/\/hifihq.com.au\/blog\/if-the-shoe-fits-matching-the-enclosure-to-the-vehicle\/","title":{"rendered":"If the Shoe Fits: Matching the Enclosure to the Vehicle"},"content":{"rendered":"\n
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Tech Talk | WRITTEN BY AARON TRIMBLE | Published May 25, 2017<\/h6>\n\n\n\n

Given the volume of questions that our technical department receives on this topic, we are again publishing this Tech Talk. If you\u2019ve ever wondered how many 18s should you put in your 99 Camaro, this is a must read! SPOILER, the answer is ZERO. <\/em><\/p>\n\n\n\n

We\u2019ve all seen the DD Box system right? Work within the 1.5:1 and 3:1 ratios for port size based on the cone area of the woofer then divide it by 16 to find your net airspace\u2026 No?  Well those of you who\u2019re not DD Techies, check out last December\u2019s Tech Talk, \u201cDoes Size Really Matter<\/a>\u201c, first! No, no it\u2019s fine, we\u2019ll wait.<\/p>\n\n\n\n

Did you read it?  Ok, great!<\/p>\n\n\n\n

So, we all know that the DD Box system is a great way to get a massive performance boost over the conventional prefabricated enclosure, but did you know that you can take it a step further? That\u2019s right, we can manipulate the system to fine tune your enclosure for just the right kind of heart pounding bass you\u2019re looking for.<\/p>\n\n\n\n

Let\u2019s say you\u2019re a looking for a well rounded musical set-up. You know, something that can smash on the lows, but doesn\u2019t sacrifice performance in the top end. The 808 sounds just as good as the kick drums. Well let\u2019s take a look at your vehicle. A Ford Focus sedan and a Chevy Tahoe are very different vehicles, not just in the way they drive, how many people they can seat or their MPG, but also the way they sound, and I\u2019m not talking about the exhaust either. What we\u2019re concerned about is the vehicle\u2019s internal acoustics. Generally speaking, larger and\/or longer vehicles will have a lower natural resonance, whereas smaller vehicles, and in a lot of cases, older vehicles, will tend to have higher natural resonances. Knowing this we can plan ahead. If we\u2019re in a smaller vehicle that reinforces high frequencies well we can tune our enclosure lower. Additionally, if we have the space to sacrifice, we can also use a larger cabinet for the sub to play in to really accentuate the low bass response in the vehicle that would otherwise be lacking. Conversely, if we\u2019re in a larger vehicle, like the Tahoe, that naturally reinforces low frequency play we can get away with tuning the enclosure higher to give the vehicle a more well rounded performance. Smaller enclosures can also be helpful in this application to provide a more responsive top end play.<\/p>\n\n\n\n

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In the graph above you can see some very interesting things. This vehicle is a 1986 Isuzu Trooper with our favorite\u00a03510<\/a>\u00a0in it in a variety of differently sized enclosures. Each enclosure is tuned at 35 Hz. This vehicle is great at showing exactly how a vehicle with a high natural resonance can affect the performance of a system. Be mindful that this car is quite large, but it\u2019s also fairly old and has a lot of windows and flat panels. This vehicle reinforces a lot of high frequencies, and its peak in this case is at 60 Hz. Because of this, enclosures that are larger than normal for their respective woofers and enclosures that are tuned lower will round out the performance of this vehicle without the use of equalization better than smaller or more highly tuned enclosures. <\/p>\n\n\n\n

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If we compare the Trooper to a 2016 Porsche Macan that we used in the December article, using the same test boxes, you can see there is less deviation in output across the sub range than there was in the Isuzu. The Porsche, being newer, with more well dampened interior panels, despite being smaller, has a much lower acoustic resonance. Since the Macan\u2019s peak is closer to the 40 Hz range, if we used an enclosure tuned lower than our 35 Hz test enclosures it would yield a wider bandwidth.<\/p>\n\n\n\n

Now, if rules of thumb aren\u2019t your thing, and you\u2019re looking to be more accurate in determining how your vehicle responds to bass, you can take it to the next level. You\u2019ll need a sealed enclosure and a woofer that fits in that sealed enclosure. Additionally you\u2019ll need your smart phone with a dB meter on it (or a Termlab if you\u2019re lucky enough to have access to one) and a handful of test tones. Load the woofer into the sealed enclosure and place it in the future location of your new subwoofer set-up. From the driver\u2019s seat with your dB meter handy, play the lowest frequency you want your new system to play at a moderate volume and measure how loud it is. Next go up a couple of frequencies and play the system again, be sure to measure the output again. It\u2019s best to record these numbers as you continue your testing.  Continue testing and recording frequency outputs until you reach the top frequency that you\u2019re interested in playing. It\u2019s important that you don\u2019t change any settings on the amp or the radio like volume or EQ while you\u2019re testing. Once you\u2019re done you can see where your vehicle\u2019s peak frequency is at, and how your vehicle reacts with the given sub and enclosure set-up. The reason we use a sealed enclosure for this test is because the sealed enclosure is going to have a naturally flatter response than a ported or even a bandpass enclosure without knowing the environment that the sub is playing in. Once you have this data, you can more accurately determine how to approach your real enclosure.<\/p>\n\n\n\n

So, when you get ready to build your next enclosure, keep your vehicle in mind. Is it large? How new is it? Does it have well dampened paneling or is it mostly card stock like a classic vehicle? All these things can affect the performance of your new sub system, and a well designed enclosure that matches the car can turn a system from something that is loud into something that\u2019s loud, and sounds amazing.<\/p>\n","protected":false},"excerpt":{"rendered":"

Tech Talk | WRITTEN BY AARON TRIMBLE | Published May 25, 2017 Given the volume of questions that our technical department receives on this topic, we are again publishing this Tech Talk. If you\u2019ve ever wondered how many 18s should you put in your 99 Camaro, this is a must read! […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-2182","post","type-post","status-publish","format-standard","hentry","category-tech-talk"],"_links":{"self":[{"href":"https:\/\/hifihq.com.au\/blog\/wp-json\/wp\/v2\/posts\/2182","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hifihq.com.au\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hifihq.com.au\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hifihq.com.au\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/hifihq.com.au\/blog\/wp-json\/wp\/v2\/comments?post=2182"}],"version-history":[{"count":2,"href":"https:\/\/hifihq.com.au\/blog\/wp-json\/wp\/v2\/posts\/2182\/revisions"}],"predecessor-version":[{"id":2194,"href":"https:\/\/hifihq.com.au\/blog\/wp-json\/wp\/v2\/posts\/2182\/revisions\/2194"}],"wp:attachment":[{"href":"https:\/\/hifihq.com.au\/blog\/wp-json\/wp\/v2\/media?parent=2182"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hifihq.com.au\/blog\/wp-json\/wp\/v2\/categories?post=2182"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hifihq.com.au\/blog\/wp-json\/wp\/v2\/tags?post=2182"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}