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Break in period for subs
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<blockquote data-quote="mat3833" data-source="post: 8754289" data-attributes="member: 587645"><p>As much as I love a good shit-slinging both of you are correct. A subs "break in" or lack thereof, is entirely based on the construction of the woofer and its intended use. </p><p></p><p>I've ran more subs than I can remember, and I've only done any kind of break in procedure on a handful. Mechanical compliance and motor force are the only 2 things that really matter when it comes to break in. Enclosure type affects overall compliance, but for simplicity sake let's remove that variable. </p><p></p><p>Very strong motors don't give a **** about how stiff or soft a spider is. You give it X power and it will move X distance with very little variation. Softer spiders are more compliant from the get-go, and a stack of 3 soft spiders may have the same overall compliance of a single stiff spider, but they don't have the same potential for cracking as that stiff spider. Think of it like this:</p><p></p><p>Anyone who has used PVC or any kind will tell you to be careful with it in below 50 degree Temps. A prime example of this is XPVC sheets. A 1/4 inch thick 4'X8' sheet can be bent into a circle when it's 90 degrees, but that same sheet will Shatter if you try the same thing at 40 degrees. Spiders are basically just some kind of polymer binder mixed with fibers and heat cured into a specific shape. Anyone who has used bondo understands the concept. Those polymer binders start out resistant to flexing, some more than others. Flex a stiff polymer too much and it will Shatter. </p><p></p><p>Honestly I could care less if a Yahoo rips their sub apart. And I could also care less if Joe blow has ran the "bass monster 30k" aka, worlds stiffest sub, on 50k watts right out of the box. Anyone who knows anything about material compliance or mechanical fatigue should understand that anything designed to flex under a load will inherently require some form of break in and will also have specified limits to operating temperature/compliance range before a failure is going to happen. </p><p></p><p>This is what a fatigue failure looks like:</p><p>[ATTACH=full]30732[/ATTACH]</p><p></p><p>That's a 1/4 inch stainless high pressure line for a water Jet.</p><p></p><p>[ATTACH=full]30733[/ATTACH]</p><p></p><p>That line is designed to move with the track and flex while carrying a 60 THOUSAND PSI stream of water inside of it. You can coil a 20 foot section of the line into a 30 inch circle without much trouble. Hell, you can tow a car with a section of this stuff, it isn't fragile. </p><p></p><p>The simple fact of all of this bullshit is some subs do need a break in period. It may not be absolutely critical, and you may get away without doing it just fine, but that doesn't change the facts. </p><p></p><p>Matt</p></blockquote><p></p>
[QUOTE="mat3833, post: 8754289, member: 587645"] As much as I love a good shit-slinging both of you are correct. A subs "break in" or lack thereof, is entirely based on the construction of the woofer and its intended use. I've ran more subs than I can remember, and I've only done any kind of break in procedure on a handful. Mechanical compliance and motor force are the only 2 things that really matter when it comes to break in. Enclosure type affects overall compliance, but for simplicity sake let's remove that variable. Very strong motors don't give a **** about how stiff or soft a spider is. You give it X power and it will move X distance with very little variation. Softer spiders are more compliant from the get-go, and a stack of 3 soft spiders may have the same overall compliance of a single stiff spider, but they don't have the same potential for cracking as that stiff spider. Think of it like this: Anyone who has used PVC or any kind will tell you to be careful with it in below 50 degree Temps. A prime example of this is XPVC sheets. A 1/4 inch thick 4'X8' sheet can be bent into a circle when it's 90 degrees, but that same sheet will Shatter if you try the same thing at 40 degrees. Spiders are basically just some kind of polymer binder mixed with fibers and heat cured into a specific shape. Anyone who has used bondo understands the concept. Those polymer binders start out resistant to flexing, some more than others. Flex a stiff polymer too much and it will Shatter. Honestly I could care less if a Yahoo rips their sub apart. And I could also care less if Joe blow has ran the "bass monster 30k" aka, worlds stiffest sub, on 50k watts right out of the box. Anyone who knows anything about material compliance or mechanical fatigue should understand that anything designed to flex under a load will inherently require some form of break in and will also have specified limits to operating temperature/compliance range before a failure is going to happen. This is what a fatigue failure looks like: [ATTACH type="full"]30732[/ATTACH] That's a 1/4 inch stainless high pressure line for a water Jet. [ATTACH type="full"]30733[/ATTACH] That line is designed to move with the track and flex while carrying a 60 THOUSAND PSI stream of water inside of it. You can coil a 20 foot section of the line into a 30 inch circle without much trouble. Hell, you can tow a car with a section of this stuff, it isn't fragile. The simple fact of all of this bullshit is some subs do need a break in period. It may not be absolutely critical, and you may get away without doing it just fine, but that doesn't change the facts. Matt [/QUOTE]
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