I don’t know of any subs that change Fs after break in. One seller just has the wrong numbers.
Good info. Learn something new everyday. Now I’m curious. Isn’t Fs a spec used in programs like winisd to design an enclosure? If so, if that figure will change after break in, how big of an effect does that have on the box you designed based on the pre break in figure?When a driver's suspension loosens after break in, an inherent effect of the suspension softening is in fact a drop in fs.
The amount that fs changes depends on the driver and materials used to build it.
This change can be further backed up with equipment that can measure tsp data like the Klippel or Dayton DATS system by completing a before and after measurement of ts parameters.
That being said, manufacturer listed tsp data is rarely accurate and often manipulated by the manufacturer's marketing department. Often listed specs are an average from the production run.
The only true way to know is by physically measuring the data with a Klippel, DATS or other reputable accurate method.
edit: further example using a Blaupunkt GBW801 pre break on the left and post break in on the right.
Break in consisted of playing 25hz free air on roughly 25% power handling for 10 mins.
Note the roughly 14% drop in fs after break in, I still wouldn't call the #'s 100% accurate due to the vas measuring method needed for the DATSv2 but there's enough data there that I would call close enough to make analysis.
View attachment 26141
compare that to what the manufacturer provides:
View attachment 26144
Good info. Learn something new everyday. Now I’m curious. Isn’t Fs a spec used in programs like winisd to design an enclosure? If so, if that figure will change after break in, how big of an effect does that have on the box you designed based on the pre break in figure?
Ahh, so the manufacturer’s Fs is or should be the subs post break in figure.Several manufacturers post T/s after a short break in. But a lot of recommendations for woofers are from playing them a lot. But I've ran across quite a few t/s parameters where they seem way off. Like memphis mojo6 vas was like 450 liters off.....
Ahh, so the manufacturer’s Fs is or should be the subs post break in figure.
Ahh, so the manufacturer’s Fs is or should be the subs post break in figure.
That's because Memphis Audio is trash. I hate that company. I'd buy Skar before themSeveral manufacturers post T/s after a short break in. But a lot of recommendations for woofers are from playing them a lot. But I've ran across quite a few t/s parameters where they seem way off. Like memphis mojo6 vas was like 450 liters off.....
That's because Memphis Audio is trash. I hate that company. I'd buy Skar before them
This is all true and the specs you have posted seem to change roughly as much as I'd expect to be consistent with woofers I have measured. Also I would say that after 10 minutes of hard play (or whatever test tone ritual you prefer) you shouldn't expect much more variance in the future. The vast majority of TSP change from suspension softening happens very quickly.This is a factually incorrect and complete ignorant statement.
When a driver's suspension loosens after break in, an inherent effect of the suspension softening is in fact a drop in fs.
The amount that fs changes depends on the driver and materials used to build it.
This change can be further backed up with equipment that can measure tsp data like the Klippel or Dayton DATS system by completing a before and after measurement of ts parameters.
That being said, manufacturer listed tsp data is rarely accurate and often manipulated by the manufacturer's marketing department. Often listed specs are an average from the production run.
The only true way to know is by physically measuring the data with a Klippel, DATS or other reputable accurate method.
edit: further example using a Blaupunkt GBW801 pre break on the left and post break in on the right.
Break in consisted of playing 25hz free air on roughly 25% power handling for 10 mins.
Note the roughly 14% drop in fs after break in, I still wouldn't call the #'s 100% accurate due to the vas measuring method needed for the DATSv2 but there's enough data there that I would call close enough to make analysis.
View attachment 26141
compare that to what the manufacturer provides:
View attachment 26144