diff size in magnets but able to handle the same amount of rms?

[tsupra98 10+ year member]

so i used to have a 15" L5 and i just got 2 12" L7's. they both handle 750 rms but the magnet on the 15" was alot bigger then the magnet on the 12's. why is this? if they both handle 750 rms shouldn't they have the same size magnet?

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[tsupra98 10+ year member]

any idea's??

 

[infamous_e46 5,000+ posts]

you need to read more on this forum

also magnet size has little to do with power handling

 

[Immacomputer 10+ year member]

About the only thing that's true about magnet size is that the bigger it is, the heavier it weighs and the bigger it is, the more heat it can absorb. That isn't going to change the power handling though as that will be limited by the coil, former, coil glue, suspension, and motor cooling techniques.

Magnet size also tells you NOTHING AT ALL about how the driver will perform. The only reason why it's mentioned in spec sheets is because it's a good marketing tool for the people who know nothing about how drivers work.

 

[DidUHearThat? 10+ year member]

Dick size is an indicator of how much power your system can handle.

 

[Ed Lester 10+ year member]

Thermal power handling depends on voice coil material, size, and type.

Mechanical power handling depends on suspension material and geometry.

Magnet size does nothing for power handling

 

[bose301s 5,000+ posts]

About the only thing that's true about magnet size is that the bigger it is, the heavier it weighs and the bigger it is, the more heat it can absorb. That isn't going to change the power handling though as that will be limited by the coil, former, coil glue, suspension, and motor cooling techniques.
Magnet size also tells you NOTHING AT ALL about how the driver will perform. The only reason why it's mentioned in spec sheets is because it's a good marketing tool for the people who know nothing about how drivers work.

Thermal power handling depends on voice coil material, size, and type.Mechanical power handling depends on suspension material and geometry.

Magnet size does nothing for power handling

Spot on.

 

[silvercookie 5,000+ posts]

new technology is amazing isnt it.

 

[tsupra98 10+ year member]

alright i got it. i was just curious and thought i would ask. thanks guys

 

[audioholic 5,000+ posts]

Thermal power handling depends on voice coil material, size, and type.Mechanical power handling depends on suspension material and geometry.

Magnet size does nothing for power handling

Actually, the speaker's ability to cool itself also plays a big role in its thermal limits. The W7 and DD9500 are two examples of subs that have had substantial engineering gone into their cooling features.

 

[Ed Lester 10+ year member]

Actually, the speaker's ability to cool itself also plays a big role in its thermal limits. The W7 and DD9500 are two examples of subs that have had substantial engineering gone into their cooling features.

That is true.

things like spider plateau venting help alot, so does voice coil former venting and motor venting in general like DD and MMATS used to do.

and the DD99Z motor is totally open to allow for maximum airflow.

So motor geometry and air cooling design is much more important than physical size.

Typically larger sized magnets have more magnetic force, allowing the the coil to be pushed with more force, but this does not always apply because of different materials used for magnets and again, the geometry.

That brings us back to the DD99Z and NEO type motors that have alot of force for their size.

 

[audioholic 5,000+ posts]

Many things go into creating the actual BL force of the motor, including tightness of the gap etc. And, there is such a thing as more BL force than is useful. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

Just adding to what you said Ed.