Hi, please can anybody tell me if I am ok reading this graph?
According to it, the sub will blow if powered with 400w no matter if the sub is made to take 400 rms, that should be because I am mounting it on a high performance enclosure, so it would need less energy to reach its xmax, different thing with smaller enclosures and specially sealed types.
Knowing this, should I continue with my design? but just to keep in mind that not to exceed the rms power that can blows it. I still have questions, because the graph gets a high peak below 30hz, with 30hz it gets around 8mm, so I really don't know if the sub can really take 400w on this enclosure I am drawing, please help
According to it, the sub will blow if powered with 400w no matter if the sub is made to take 400 rms, that should be because I am mounting it on a high performance enclosure, so it would need less energy to reach its xmax, different thing with smaller enclosures and specially sealed types.
Knowing this, should I continue with my design? but just to keep in mind that not to exceed the rms power that can blows it. I still have questions, because the graph gets a high peak below 30hz, with 30hz it gets around 8mm, so I really don't know if the sub can really take 400w on this enclosure I am drawing, please help
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I think the dip in in the graph indicates you are modelling a vented box.
That dip occurs when the vent is resonating and the cone is hardly moving.
Above that dip the box+vent load the back of the driver and you see the stroke for those different frequencies.
Below the dip the box+vent gives less loading to the back of the driver and the stroke increases as frequency goes lower. this is where excessive power leads to excessive stroke equals damaged driver.
You have a choice
Operator sets the volume to not damage the driver.
Operator asks the designer to fit a high pass filter to lower the input voltage to the speaker at the lower frequencies.
Operator buys and installs a dynamic limiter just like the professional PA folk do.
Operator just goes on regardless and damages the driver and replaces it time after time.
That dip occurs when the vent is resonating and the cone is hardly moving.
Above that dip the box+vent load the back of the driver and you see the stroke for those different frequencies.
Below the dip the box+vent gives less loading to the back of the driver and the stroke increases as frequency goes lower. this is where excessive power leads to excessive stroke equals damaged driver.
You have a choice
Operator sets the volume to not damage the driver.
Operator asks the designer to fit a high pass filter to lower the input voltage to the speaker at the lower frequencies.
Operator buys and installs a dynamic limiter just like the professional PA folk do.
Operator just goes on regardless and damages the driver and replaces it time after time.
whether the sub will blow or not depends on the construction of the driver.
Sims assume that everything responds in a linear fashion, and they don't in reality. Suspensions are non-linear - they get stiffer and there is less magnet flux the more you exceed Xmax. Some manufacturers post an Xmech (damage limit).
Excursion predictions are usually conservative, but some driver defects (dynamic offset) can cause extreme excursions with much less power than predicted with a linear sim. I have some old Cerwin Vegas that will jump almost out of the gap when they meet the infamous telarc 1812 cannons recording, even at much less than a watt input before the cannon fire....
Even a good sim is just a sim.
Sims assume that everything responds in a linear fashion, and they don't in reality. Suspensions are non-linear - they get stiffer and there is less magnet flux the more you exceed Xmax. Some manufacturers post an Xmech (damage limit).
Excursion predictions are usually conservative, but some driver defects (dynamic offset) can cause extreme excursions with much less power than predicted with a linear sim. I have some old Cerwin Vegas that will jump almost out of the gap when they meet the infamous telarc 1812 cannons recording, even at much less than a watt input before the cannon fire....
Even a good sim is just a sim.
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Joined 2008
Sorry I clicked so now I'm responding - It's almost Xmas 2019, Zombie Threads are much better in October 🙂 LOL!