posted
okay, me and a couple of my friends were debating on subs. One of my friends say the bigger the magnet on the sub the more bass you will get. I just laughed because that doesn't seem true. so what is the purpose of the magnet? Thanks.
Posts: 155 | From: OH | Registered: Nov 2003
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well, a bigger magnet may quite likely mean the sub has higher x-max (linear cone excursion) and a bigger voice coil (so higher power handeling) so, its quite possible that a bigger magnet will yield more bass, due to higher power handeling, and more cone excursion... but this isn't always the case Posts: 3531 | From: Adelaide, Australia | Registered: Mar 2005
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posted
well actually X-max is the amount of coil that hangs outside the gap...
Bigger magmets allow for a stronger motor assembly, there is also a whole heap of other technical stuff that goes along with stronger motor(bigger magnet assemblies), but i'm still trying to digest the first few pages of 'The loudspeaker desigh cookbook, by Vance Dickason.
-------------------- some times way too much is just right.... Posts: 224 | From: australia | Registered: Sep 2002
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well, if a magnet is only 2cm thick, then I highly doubt the woofer has the same x-max as a woofer with a 4cm magnet...
hey? x-max is the linear cone excursion.... x-mech is the peak cone excursion, which may be limited by the surround, spider, or voice coil gap...
it also depends on the magnet material... a bigger magnet MAY have a high BL (motor strength) than a smaller one, but once again, not necissarily, the smaller magnet may be made of a better material...
Posts: 3531 | From: Adelaide, Australia | Registered: Mar 2005
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posted
this is an email from a person who actually works for a company who builds woofers: I would like to clarify something that is often misunderstood in the industry. Xmax is a standard for what amount of the coil hangs outside the gap and it can only be one way this really does not have a whole lot to do with how far the speaker moves peak to peak mechanicaly or linear especially this is unfair to the ****** speaker or any other line that uses a front plate 1.25 inches thick(of coarse less of the coil will hang outside the gap) When using the term linear excursion peak to peak means 80% of the coil is in the gap. the ****** not only uses a larger front plate but we also have an extended pole piece and in doing so this adds to the control even more than most for the part of the coil that is outside the gap. Often people ask such ?s about speakers and either do not know or forget to ask the other required facts before they place judgement of a speaker.You will run into many people like this they think they know something and that all they need to know is Xmax, and actually what they really want to know is how far the speaker moves Peak to Peak linear or Peak to Peak mechanical not the Xmax this is the wrong ? or statement as for the ****** Linear Peak to Peak( still kind of unfair as in the above) is 40mm. Now the mechanical Peak to Peak is over three inches and even at 3 inches you stillhave 30% of the coil in the gap peak to peak, wich is not to bad. I sure would like to see just how many speakers can do that! So 2-2.5 inches is real nice with our speakers not linear but hey like I said we have an extended pole piece and a really thick front plate something most do not have.
I've editted out the brand name so it does look like i am pushing a brand. But this author of this email have many years of experience in woofer construction, so i'd tend to think he knows what means what. Or even better, have a look at Vance's book, pg 5 there are 2 pictures, 1 of a overhung voice coil and 1 of a underhung voicecoil, and guess what they show Xmax as the amount of coil out of the top plate for the overhung VC and the amount of coil under the top plate for the underhung VC.
-------------------- some times way too much is just right.... Posts: 224 | From: australia | Registered: Sep 2002
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gold plating is over rated, chrome is louder
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"Ever been Beat by a Girl?" 2005 4th Place Street A World Finals 153.2 2006 World Finals Street A well, better luck next year 2007 1st Place Street A US Champion 156.7 2007 2nd Place Street A World Finals 156.8 Posts: 426 | From: West Coast | Registered: Feb 2005
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