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Posted

Subwoofer Rule #1: There's no replacement for displacement.

Unless that 10" pushes a serious amount of air, I wouldn't expect a ton of volume down in the low 20hz range. Even with the 1000W amp.

Posted

The Sunfire is a long-throw, so it still has displacement. :)

Displacement is volume, not area.

I would definitely do a Sunfire again (I used to have a True Sub Jr.).

I also prefer the continuous phase, rather than a 0/180 switch.

I don't know if the SVS that I am lusting after has a long throw driver -- that might throw me back into the Sunfire camp.

Posted
The Sunfire is a long-throw, so it still has displacement. :)

Displacement is volume, not area.

No shit, I'm aware of this, and just because they call it long-throw doesn't mean it actually is. Smaller drivers need to have a huge x-max to compete with bigger drivers.

I'd almost guarantee that the SVS driver has a higher xmax than anything sunfire has ever used.

Posted
Smaller drivers need to have a huge x-max to compete with bigger drivers

nope. What about difference between underhung and overhung voice coils? Different topology means you cannot compare the numbers directly.

Posted

ok fine as a general rule of thumb for a smaller drive to have more displacement than a bigger one it needs to have a higher x-max assuming all other things equal :P

Posted (edited)
ok fine as a general rule of thumb for a smaller drive to have more displacement than a bigger one it needs to have a higher x-max assuming all other things equal :P

Xmax is a crock. I mean, what distortion to you define? I could define Xmax = Xphysical, why not.. I'd have a ton of distortion, but hey. If you think everyone uses a 10% number, you'd be wrong... It's just like Watts... without clarification, it's rather meaningless.

edit: just found this link, good read:

http://www.aespeakers.eu/knowledge-base/the-deal-with-xmax.html

Edited by luvdunhill
Posted
Xmax is a crock. I mean, what distortion to you define? I could define Xmax = Xphysical, why not.. I'd have a ton of distortion, but hey. If you think everyone uses a 10% number, you'd be wrong... It's just like Watts... without clarification, it's rather meaningless.

christ, why are you making such a big deal out of this? i was just using xmax as a parameter to make my point about displacement being key when it comes to subwoofers....

Posted
christ, why are you making such a big deal out of this? i was just using xmax as a parameter to make my point about displacement being key when it comes to subwoofers....

because, it's a rather bogus parameter. The resulting SPL would be more appropriate comparison in my opinion.

Posted

eh thats almost just as bogus, unless your using an anocheic chamber and have precise measurements as to how far away the mic is. plus spl #'s change completely depending on the room used. xmax doesn't ;).

Posted (edited)
eh thats almost just as bogus, unless your using an anocheic chamber and have precise measurements as to how far away the mic is. plus spl #'s change completely depending on the room used. xmax doesn't ;).

Not for these frequencies. 1W 1m is the standard for SPL. There simply isn't a standard for measuring Xmax, see my article above. SPL also accounts for Sd, so you can compare different diameter drivers directly.

I've measured this many, many times. Hell, microphone calibration doesn't even come into play at this sort of measurement.

I'll give it a rest.

Edited by luvdunhill
Posted
No shit, I'm aware of this, and just because they call it long-throw doesn't mean it actually is.
I accidentally drove one of my old True Sub Jr.'s at extremely high volumes, and saw the driver excurse, so I can tell you it actually is.
Posted

Todd, you haven't figured out yet that Marc is one of those annoying nerds who can't stand it when some factual detail no one cares about but him is misrepresented?

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