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x max? i have an idea


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bwhvac065@aol.c 
Copper - Posts: 67
Copper spacespace
Joined: April 05, 2009
Location: Indiana, United States
Posted: April 11, 2009 at 12:32 AM / IP Logged  
the question i have is x max is it measured by the full pos and neg from the neutral position of the sub or is it from the neutral position positive or neg? not polarity but position of the cone
Blazerspl
6 rockford 12s
5500 watt pa amp
12.0 cubic enclosure
BIG 3
haemphyst 
Platinum - Posts: 5,054
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Joined: January 19, 2003
Location: Michigan, Bouvet Island
Posted: April 11, 2009 at 1:07 AM / IP Logged  
Xmax is measured as two numbers. The first is listed as Xmax and is the linear number, and this is the measurement of {voice coil height, minus gap height, divided by 2} This is generally the number that will be shown in a T/S parameter list.
The second will generally be listed as Xmech, which is twice the length of the "bangin' the stops" (the inward movement) number.
Either way, they are generally both listed as two way dimensions.
It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."
bwhvac065@aol.c 
Copper - Posts: 67
Copper spacespace
Joined: April 05, 2009
Location: Indiana, United States
Posted: April 11, 2009 at 1:11 AM / IP Logged  
ok i was way off i thought it had to do with the distance of cone travel
Blazerspl
6 rockford 12s
5500 watt pa amp
12.0 cubic enclosure
BIG 3
haemphyst 
Platinum - Posts: 5,054
Platinum spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spacespace
Joined: January 19, 2003
Location: Michigan, Bouvet Island
Posted: April 11, 2009 at 2:21 AM / IP Logged  
It does. The distance of cone travel is EXACTLY the same distance as the voice coil's travel, right? They are mechanically connected to one another, so where one goes the other MUST, as well (with the possible exception of a burp grenade!)
It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."
Steven Kephart 
Platinum - Posts: 1,737
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Joined: November 06, 2003
Location: Oregon, United States
Posted: April 11, 2009 at 10:54 AM / IP Logged  
One minor correction, Xmax is generally rated as a one-way figure. Although some companies do rate it two-way (Audiobahn) to make their figures look better.
haemphyst 
Platinum - Posts: 5,054
Platinum spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spacespace
Joined: January 19, 2003
Location: Michigan, Bouvet Island
Posted: April 11, 2009 at 12:36 PM / IP Logged  
I thought Dan was one of the few exceptions to the "two-way" rule. So the TC1000 10's I have in my trunk are REALLY 42mm Xmax? Sweet! I can re-figure my TL, then!
(Actually, I've been toying with the idea of re-building the enclosure altogether - I think I want to go back to sealed... I miss the output capabilities of those drivers... x max? i have an idea -- posted image.)
It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

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