Really stupid question

[jdawg90 10+ year member]

Okay i know if you have two of the same subs (lets say 12's) on 1kw a piece it will be louder than one 18" (roughly double the area of 2 12's) of the same sub on 1kw. This doesnt really makes sense to me... it would seem like they would be equal since there is the same motor pushing the 18, and the 18 is about twice the area.

anyone wanna explain this to me?

I know its a retarded question

Click to read more...

 

[bsean63 10+ year member]

whys it matter?

 

[jdawg90 10+ year member]

whys it matter?

it doesnt really... ive just wondered this for a while

 

[Pl8er 5,000+ posts]

You sorta answered this yourself. A few of the guys here can get VERY technical and explain exactly why......the only easy way I can think of is this example.

Lets say you have a fan that is being moved by your hand. You start at a set point and have exactly 2 seconds to reach the bottom. The fan is 18" in width. Now repeat the test with a fan that is 24" wide using the same amount of power. Which one do you think is going to move the most air?

 

[mokedaddy 5,000+ posts]

power compression.

The same reason 2 12s on 2k a piece wont be 'twice' as loud.

 

[Pl8er 5,000+ posts]

whys it matter?

Because it does.

 

[Rashaddd 5,000+ posts]

Cone area multiplied by xmax gives you an idea of a subs 'potential' to create sound, and tells you how much air the sub can move at full excursion. However, this is only a rough reference, as there are unlimited other factors that will affect how loud a sub can get.

In general, more cone area at a given xmax means potentially louder, but its not always true.

Also, no one can tell you based on a few specs for sure whether one sub will be louder than another, unless they are significantly diffferent.

Further, the law of diminishing returns comes into play if you want to get more technical. Two of the same 12 on twice the power as one of them, will never be twice as loud. The gain will be exponentially smaller everytime you are adding more power or more cone area

 

[jdawg90 10+ year member]

Cone area multiplied by xmax gives you an idea of a subs 'potential' to create sound, and tells you how much air the sub can move at full excursion. However, this is only a rough reference, as there are unlimited other factors that will affect how loud a sub can get.
In general, more cone area at a given xmax means louder, but its not always true.

Also, no one can tell you based on a few specs for sure whether one sub will be louder than another, unless they are significantly diffferent.

yea xmax has always confused me too... a lot of subs with low xmax are spl subs... like the BL and a lot of DD subs... shit the Q has more xmax than the bl and is more of a sq sub...

 

[jmanpc 5,000+ posts]

You sorta answered this yourself. A few of the guys here can get VERY technical and explain exactly why......the only easy way I can think of is this example.
Lets say you have a fan that is being moved by your hand. You start at a set point and have exactly 2 seconds to reach the bottom. The fan is 18" in width. Now repeat the test with a fan that is 24" wide using the same amount of power. Which one do you think is going to move the most air?

I think that was the dumbest possible answer for this question. Congratulations.

 

[jmanpc 5,000+ posts]

yea xmax has always confused me too... a lot of subs with low xmax are spl subs... like the BL and a lot of DD subs... shit the Q has more xmax than the bl and is more of a sq sub...

Xmax has little to do with how loud a sub can get in a ported box.

 

[dman4486 5,000+ posts]

yea xmax has always confused me too... a lot of subs with low xmax are spl subs... like the BL and a lot of DD subs... shit the Q has more xmax than the bl and is more of a sq sub...

that is because an spl sub is designed to play "A" note, and if you tune an enclosure to that note, the excursion is minimal comparatively

 

[jmanpc 5,000+ posts]

When playing an SPL sub at or near tuning, it hardly moves. When I played my HD3 at full power at 42hz (my car's peak freq) the sub may have been moving 1/2" peak to peak, yet it was loud enough to deflorate your sister.

 

[dman4486 5,000+ posts]

When playing an SPL sub at or near tuning, it hardly moves. When I played my HD3 at full power at 42hz (my car's peak freq) the sub may have been moving 1/2" peak to peak, yet it was loud enough to deflorate your sister.

//content.invisioncic.com/y282845/emoticons/hilarious.gif.02a037aad04aa96f19982b298a3d70a8.gif

 

[Pl8er 5,000+ posts]

I think that was the dumbest possible answer for this question. Congratulations.

At least I attempted to help *shrug*

I guess I'll just stick with coming on and bashing everyone instead.

Hey, whats your password again?

 

[jmanpc 5,000+ posts]

At least I attempted to help *shrug*
I guess I'll just stick with coming on and bashing everyone instead.

Hey, whats your password again?

Try 'Kill Yourself'