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#1
Posted to rec.audio.car
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Box air volume ?
Hello,
I have been toying with the idea of building a new box for my truck i have been looking at different specs and stuff and i was wondering what the advantage or disadvantages is to having more or less air volume inside the box? thank you for any replies TroyT. |
#2
Posted to rec.audio.car
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Box air volume ?
generally, higher volume will increase low end extension and sensitivity (less power to reach full excursion), but too large of a box may lose transient response because of the less control over the cone. lower box volume is basically the opposite. Most people go for something in-between. -- KU40 |
#3
Posted to rec.audio.car
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Box air volume ?
On Dec 26, 3:10 pm, "Troy T." wrote:
I have been toying with the idea of building a new box for my truck i have been looking at different specs and stuff and i was wondering what the advantage or disadvantages is to having more or less air volume inside the box? thank you for any replies KU40's advice is sound (no pun intended). But it's important that you follow the manufacturer's recommendations for enclosure volumes and types. -dan |
#4
Posted to rec.audio.car
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Box air volume ?
thank you both for the advice, i was looking up the specs for my sub
and there are specs for 3 different types of sealed boxes and one of them is Low Qtc sealed enclosure, and i was wondering what exactly that is and how does it compare to normal boxes or a SPL box because those are the other types of boxs they give specs for. here is the link to the specs the box volume is towards the bottom: http://www.orioncaraudio.com/subwoof...b_p_series.asp thank you again TroyT. |
#5
Posted to rec.audio.car
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Box air volume ?
On Dec 27, 10:29 am, "Troy T." wrote:
thank you both for the advice, i was looking up the specs for my sub and there are specs for 3 different types of sealed boxes and one of them is Low Qtc sealed enclosure, and i was wondering what exactly that is and how does it compare to normal boxes or a SPL box because those are the other types of boxs they give specs for. here is the link to the specs the box volume is towards the bottom:http://www.orioncaraudio.com/subwoof...b_p_series.asp Okay, this makes your question seem much more sane. :-) The problem with those "specs" is that they really don't tell you much. For example, what they consider "low" Qtc. Strictly speaking, a system with a Qtc of 0.707 is considered "critically damped" (google for it if you're curious). Anything below this magical value is considering "low Q" and anything over it is "high Q". A common newbie mistake is to look at any given spec outside of the context of the other specs related to it. In this situation, it would be a mistake to pick an alignment based upon Q values without also considering the F3 (the -3dB point)....that is, if they gave you the information you need to make such an informed decision. :-) If your Qtc is "too low" (according to your taste and usage), then your subwoofer will sound really lifeless and "dry" to you; conversely, if it is "too high", it'll seem boomy and resonant. Some people prefer one over the other, so mileage always varies. As a general rule of thumb for sealed boxesx, for the typical listener, a good starting place is a Qtc between 0.8 - 1.2 with a -3dB point somewhere in the general range of 35 - 45 Hz...and it can be tweaked from there. What most people are looking for is a fairly decent LF extension with a 1-2dB "bump" in response above your -3dB point--but how much of a bump is going to be tolerable depends (again) upon the Qtc and your preferences. Your best bet is to have someone experienced with this driver assist you in picking an enclosure size based upon your personal preferences and your other system components. See http://mobile.jlaudio.com/support_pages.php?page_id=149 for a little more on sealed boxen. I hope this helps. -dan |
#6
Posted to rec.audio.car
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Box air volume ?
What the manufacturer suggests, should only be a guidline or starting point. They are dead wrong sometimes. Going strictly with what they suggest is like only buying prefab boxes. -- MaGurk |
#7
Posted to rec.audio.car
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Box air volume ?
On Dec 27, 1:15 pm, MaGurk
wrote: What the manufacturer suggests, should only be a guidline or starting point. They are dead wrong sometimes. Going strictly with what they suggest is like only buying prefab boxes. This seems like a bit of an overstatement and in general is not true. Nobody knows the product more than the people who make the product. It may be crappy product to begin with, but they'll still know more about their crap than anyone else does because they (presumably) spent some time researching, engineering and testing it. So, going with what they suggest (particularly if you get it direct from someone in Technical Support) is not necessarily a bad thing to do--it can actually be the *best* thing to do. But as with anything else in life, you have to consider the source. I don't think I'd have a problem following any *reputable* manufacturer's recommendations. And I have to take exception to your unqualified maligning of "prefab boxes". If you're talking about someone just slapping a box together and routing-out some big holes on it and saying "this box is for 10-inch subwoofers", then yes, I would agree with you that this is a mistake. However, in the context of your post (and of the thread), I can only assume you are talking about the boxes that the manufacturer makes specific for its own product, and in that case I cannot disagree more with you...again, assuming a reputable manufacturer. The one company with which I am most familiar is JL Audio, and I can personally attest (having once been on their payroll) that they do *not* slap things together and that even their "bottom of the line" pre-fabricated enclosures are very high quality and will yield great results for the vast number of "typical customers". These pre-made enclosures will likely not satisfy the "golden-eared tweak" nor the "bass monkey", but those customers are at two different extremes of the distrubution of customers. To sum it all up: not all manufacturers are stupid, nor are all "pre-fab" boxes bad. -dan |
#8
Posted to rec.audio.car
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Box air volume ?
I agree with D. Kreft, but I think I have one thing to add, and that is to understand the marketing of the company and how it relates to their box suggestions. I've seen some companies (I think Kicker may have been one at one time) that markets their subs as SPL machines, so they recommend ported boxes with high tunes (like 40+ hz). You just have to realize they are marketing towards basshead teens who like to impress their friends, who will in turn buy the same thing. Most don't fully understand sound quality or want a flat frequency response across the spectrum. At the same time, some manufacturers may recommend a higher tune than you'd think, but it's for a reason. For example, RE recommends their new XXXs to be put in a box tuned to 36 hz. To me this seems high at first glance, but they built that sub with massive xmax that more than takes care of the lowend, even under tune. With a lower tune the lowend will just be overbearing. There are other companies that go for the super flat response as low as possible, so they may recommend something around 26-28 hz for a tune. So when I think of making a box for a sub, I would start with the manufacturer's recommendation, maybe adjust up or down depending on the reputation or marketing style of the company, and also look at the specs to see if the sub is strong or weak in a certain area that the manufacturer may be compensating for with their suggestion. -- KU40 |
#9
Posted to rec.audio.car
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Box air volume ?
You guys rock, I'm so glad I didn't get totally flamed for my view on the subject. I just would rather people knew more about enclosures and didn't consider the manufacturer's recommendations the only route to take. JL Audio does indeed know their stuff. Some brands though are just dead wrong in what they suggest. I've never worked with Orion, so I am going to leave it at that. Thanks for the grown up responses though... those seem to be few and far between on the forums anymore. -- MaGurk |
#10
Posted to rec.audio.car
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Box air volume ?
Thank you all for your responce.I am kinda curious as to what you guys
suggest.I have noticed that you guys dont like the "boomy" and do like the nice clean bass inorder to achieve good SQ,which is also what i am going for with my system. so i what you guys would do. thank you for your help TroyT. |
#11
Posted to rec.audio.car
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Box air volume ?
I just clicked that link you gave to the orion site. the 40 hz recommendation for the 12 is what I was talking about. The 50 hz recommendation for the 10" is just ridiculous. If you're going sealed, I'd do 1 cubic foot. -- KU40 |
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