Speaker Magnet, Does Size Matter??
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Road Warrior
Joined: May 2008
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From: FT Bragg NC
Speaker Magnet, Does Size Matter??
Been looking at upgrading my speakers for a while. Finally pulled the trigger on a set of Polk Audio MM651's. Pulled them out of the box, and looked at the magnet, it looks (is) small. The speaker quality looks 1st rate, and comes with the crossover. Haven't installed them yet cause I'm still waiting on my Arc 125.2Bx to come in. I've read all the reviews on these speakers and they all say that they're great and the base in good. So does the size of the magnet really matter??
Extreme HDF Member
Joined: Sep 2010
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From: Phoenix '53, '88, '09 Big Twins
no, magnet size varies depending on composition- the gauss ( magnetic force) matters.
in the 60's most speaker used either ceramic or AlNiCo magets so it was easy to compare apples/apples by size.
modern alloys in use have changed that. ( neodymium for one)
larger diameter voice coils better shed heat, and that can be pertinent - the rond housing at the back of the speaker is more a function of voice coil size
you can look up my old posts on speaker sensitivity and what those specs mean- that is the most important spec ( and is sometimes hidden or not disclosed ( Jandm) --- some manufactures also use non standard measurements in the specs which are used to confuse the consumer----gotta keep that snake oil level high.
the polk speakers referenced give an "efficiency" of 94dB
this term can be used instead of sensitivity, but is non-standard- polk does not publish the power used or distance at which measured- std would be 1 watt/1 meter
mike
in the 60's most speaker used either ceramic or AlNiCo magets so it was easy to compare apples/apples by size.
modern alloys in use have changed that. ( neodymium for one)
larger diameter voice coils better shed heat, and that can be pertinent - the rond housing at the back of the speaker is more a function of voice coil size
you can look up my old posts on speaker sensitivity and what those specs mean- that is the most important spec ( and is sometimes hidden or not disclosed ( Jandm) --- some manufactures also use non standard measurements in the specs which are used to confuse the consumer----gotta keep that snake oil level high.
the polk speakers referenced give an "efficiency" of 94dB
this term can be used instead of sensitivity, but is non-standard- polk does not publish the power used or distance at which measured- std would be 1 watt/1 meter
mike
Last edited by mkguitar; Dec 31, 2011 at 05:19 PM.
Stellar HDF Member
Joined: Oct 2010
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From: Port Orange, Fl
I believe it is sensitivity and that is what J&M won't share with the group.
Magnets drive bass response if all thing where equal. Problem is, the larger/strong they are, the more power it takes to drive them.
Magnets drive bass response if all thing where equal. Problem is, the larger/strong they are, the more power it takes to drive them.
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Road Warrior
Joined: May 2008
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From: FT Bragg NC
Well the Sensitivity/Effeciency on the Polk website gives 94dB. They're going in one way or another. Now where's my Amp.... I wonder what they sound like installed without the amp? While I'm waiting I figured what the heck.
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Road Warrior
Joined: May 2008
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From: FT Bragg NC
$139.99 from Crutchfield w/free shipping. Ordered the speaker rings from Hawg Wired
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Extreme HDF Member
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From: Phoenix '53, '88, '09 Big Twins
while you are throwing them in, put in one, then fire up some music.
I'd be interested in your comparison with 1 polk, 1 stock.
even though the fairing is off, so low tones may be subdued- it'll give a good comparo of sensitivity.
Mike
I'd be interested in your comparison with 1 polk, 1 stock.
even though the fairing is off, so low tones may be subdued- it'll give a good comparo of sensitivity.
Mike
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Road Warrior
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From: North Georgia
The enclosure you put them in, and then how they sound to you. The specs help determine the best enclosure size.
EDIT: Since you have a predetermined enclosure, there isn't much choice. The smaller the enclosure, if it's sealed, the boomier it will sound. (the speaker doesn't have as much air to move back and forth) As long as you have 'clean' power, you should be fine. Distortion blows up more speakers than those having too much power.
EDIT: Since you have a predetermined enclosure, there isn't much choice. The smaller the enclosure, if it's sealed, the boomier it will sound. (the speaker doesn't have as much air to move back and forth) As long as you have 'clean' power, you should be fine. Distortion blows up more speakers than those having too much power.
Last edited by Michael HD Rider; Jan 1, 2012 at 11:25 AM.