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rms is irrelevent.

Al is correct. You need to build a box with the specified volume from the manufacturer. It will sound like crap with the wrong size box. Not all 12" subs require the same volume.

If I may be so bold I might just pull you up on that comment champ.

When I design enclosures for subwoofers the T/S specs are not the only thing that I use in th PC. Power availability does have a huge impact on the design of the enclosure, as does the size of the car, the volume desired and the music styles listened too.

The most peculiar thing is that once the enclosure has been designed it often is no where near the recommended size. This is because many manufacturers often recommend the safest enclosure volume for minimal returns rather than the absolute best performing enclosure. :(

Just wanted to get that out. :P

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39 leters is about the average size these days for a seald box as most subs for cars are, a seald box will allways make a sub produce more power. but on the other hand a ported or somtimes larger box will give the sub a nicer tone or note but is not done very often in cars as when you drive most of what you hear will be DOF! DOF! DOF! most peple in there teens or mid 20s dont realy care to much for tone as they prefer max volume - "if its to loud, your to old!"

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hey just gonna pull you up on a few points there mate....

39 leters is about the average size these days for a seald box as most subs for cars are, a seald box will allways make a sub produce more power.

no, a sealed sub box will not produce more power. neither sub, nor enclosure will produce any power increase.

but on the other hand a ported or somtimes larger box will give the sub a nicer tone or note but is not done very often in cars as when you drive most of what you hear will be DOF! DOF! DOF! most peple in there teens or mid 20s dont realy care to much for tone as they prefer max volume - "if its to loud, your to old!"

ported/bandpass enclosures don't necessarily give a sub a nicer tone. in "most" instances, ported enclosures are used to optimise the output at or between certain frequencies. this is why you'll find most serious spl competitors using vented boxes and, lets be frank, most spl cars sound like ass when it comes to linearity and natural reproduction. vented boxes don't sound "nicer" in most respects either. while there are many drivers that sound lovely in the right ported/vented alignment, sealed designs usually offer much higher transient response (tightness/punch/impact/whatever adjective you like to use).

on one other note there, you're right in that increasing a sealed enclosure's volume will decrease Q (improve the sound.. sometimes). having said that, you shouldn't take a driver that sounds crap in a 30l enclosure and put it in a 100l box and hope it sounds good...

/end rant :)

d

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  • 1 month later...

it is a known fact that a seld sab will always handel more power than a venteted one becouse the air in the box will pull the sub back faster than a ported so it dosent distort if you turn up the volume that little bit higher.

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