Box size rules
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Box size rules
Just wondering, if a given sub manufacturer recommends a box size from x to y cubic feet, are you generally pretty safe taking the midpoint of those two sizes? So for you math guys that would be (x + y)/2.
My system is already set up. I'm just curious if this is a general rule that a noob could follow and get good results.
My system is already set up. I'm just curious if this is a general rule that a noob could follow and get good results.
Registered!!
Joined: Oct 2002
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From: Bay Area, California
Rep Power: 0 There are usually 3 box volumes that work depending on what kind of bass response you want. The mid-Q (.707) or high-Q (0.9) alignments are most common. You should pick a volume for one of these alignments for best results. You might get OK results averaging them, but you might not...
It would all depend on the subs and what type of enclosure you're looking for. Sealed, Bandpass, Vented (Ported), Iso-Barik, Transmission Line, etc etc etc.. there's a million different styles out there.
If you're going sealed, remember that
1. They are easy to design and construct, plus they're generally a lot smaller so if you're into trunk space, go sealed.
2. They also have a high power handling characteristics.. Another generalization is that they usually can handle a higher power amplifier(s) although going ported you can get the same dB level with a smaller amp which would be more efficient on your charging system.
3. They have an excellent transient response. Bass usually sounds clean and very accurate.
4. They do not provide a very low f3 point unless you force it.
Ported enclosures..
1. High efficiency
2. Lower f3 point
3. Less cone excursion near the f3 point.
4. They usually need a larger enclosure as opposed to a sealed enclosure.
5. They are more difficult to design and there is ver fast decay after the f3 point.
Bandpass
1. They do have the highest potential for extreme output.
2. They are the least predictable.. the smallest flaw in your design can change the entire enclosure and cause possible damage to your sub(s)
3. They require a very large enclosure.
4. If somethin happens to break due to poor construction, it's difficult to fix them.
Now, the Qtc of .9 is usually gives a more desirable outcome on vehicular applications just to overcome the natural noise of the vehicle.
Most home speakers provide a Qtc of .707 as SMX told you.
Changing the Qtc and averaging may or may not give good results..
Qtc of .5 will give you an extremely large enclosure size and doesn't control your sub very well.
Qtc of .577 which is called the Bessel Response definitely improves the transient response and but also gives you an extremely large enclosure size but it can produce extremely low frequencies and can handle quite a bit of power.
Qtc >1 gives an enhanced bass performance and detail and transient response is given up.. Think of it as a ported enclosure.. But then again the F3 point is raised a little bit.
Hope that answers your question
If you're going sealed, remember that
1. They are easy to design and construct, plus they're generally a lot smaller so if you're into trunk space, go sealed.
2. They also have a high power handling characteristics.. Another generalization is that they usually can handle a higher power amplifier(s) although going ported you can get the same dB level with a smaller amp which would be more efficient on your charging system.
3. They have an excellent transient response. Bass usually sounds clean and very accurate.
4. They do not provide a very low f3 point unless you force it.
Ported enclosures..
1. High efficiency
2. Lower f3 point
3. Less cone excursion near the f3 point.
4. They usually need a larger enclosure as opposed to a sealed enclosure.
5. They are more difficult to design and there is ver fast decay after the f3 point.
Bandpass
1. They do have the highest potential for extreme output.
2. They are the least predictable.. the smallest flaw in your design can change the entire enclosure and cause possible damage to your sub(s)
3. They require a very large enclosure.
4. If somethin happens to break due to poor construction, it's difficult to fix them.
Now, the Qtc of .9 is usually gives a more desirable outcome on vehicular applications just to overcome the natural noise of the vehicle.
Most home speakers provide a Qtc of .707 as SMX told you.
Changing the Qtc and averaging may or may not give good results..
Qtc of .5 will give you an extremely large enclosure size and doesn't control your sub very well.
Qtc of .577 which is called the Bessel Response definitely improves the transient response and but also gives you an extremely large enclosure size but it can produce extremely low frequencies and can handle quite a bit of power.
Qtc >1 gives an enhanced bass performance and detail and transient response is given up.. Think of it as a ported enclosure.. But then again the F3 point is raised a little bit.
Hope that answers your question
i boogie for the raindrops
Joined: Oct 2001
Posts: 4,497
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From: Jackson, Mississippi
Rep Power: 0 oh man... i love not having to reteach all this stuff all over, you new kids do it for me...
if you go way back into the archives of this forum all this stuff has been taught in depth over and over and over again....
if you go way back into the archives of this forum all this stuff has been taught in depth over and over and over again....
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