Giving the RE XXX another Try *Pic*

[Kryptonitewhite 10+ year member]

So above 30-40Hz, its going to be hard to get this driver to match even average drivers, but when you start diving down it really beats everything.

what do you listen to besides "C&S" to get sub 30Hz information?

 

[thericanballer 10+ year member]

lying around in your storage getting dusty? thats a sin.... lol

 

[Kryptonitewhite 10+ year member]

only properly ported XXX 18 i know of...
http://www.avsforum.com/avs-vb/showthread.php?t=1033905

josh won't sell it to me //content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif

 

[newusername 10+ year member]

Mass does play a role in how far you can extend response.

The upper frequency response is strongly related to the initial rise-time of the driver which is a strong function of the coil's inductance (and how it varies with current and position). After the initial rise-time, however, mass becomes a player in transient response and, accordingly, upper frequency extension.

So the proper conclusion to draw is that inductance is a dominant factor, and mass is of secondary import.

 

[ciaonzo 5,000+ posts]

Mass does play a role in how far you can extend response.
The upper frequency response is strongly related to the initial rise-time of the driver which is a strong function of the coil's inductance (and how it varies with current and position). After the initial rise-time, however, mass becomes a player in transient response and, accordingly, upper frequency extension.

So the proper conclusion to draw is that inductance is a dominant factor, and mass is of secondary import.

That strongly supports my association with a high degree of resolution (though, another factor involved with that would also be the decay time) but it also brings up something I missed in my previous post regarding the relationship between mass and frequency extension. Thanks for correcting me. So with a given mass-limited high frequency response, could you then extend the frequency response by simply overcoming the mass with more motor force/acceleration, assuming everything else remains static, or are you locked in to that response profile by the amount of mass alone? I'm probably reaching here.

 

[audioholic 5,000+ posts]

That strongly supports my association with a high degree of resolution (though, another factor involved with that would also be the decay time) but it also brings up something I missed in my previous post regarding the relationship between mass and frequency extension. Thanks for correcting me. So with a given mass-limited high frequency response, could you then extend the frequency response by simply overcoming the mass with more motor force/acceleration, assuming everything else remains static, or are you locked in to that response profile by the amount of mass alone? I'm probably reaching here.

You are correct, motor force plays a large role in how mass affects final performance. And, I thank you for your confidence in me, but I learn new things here all the time. Many times from you.

 

[RAM_Designs 5,000+ posts]

Mass does play a role in how far you can extend response.
The upper frequency response is strongly related to the initial rise-time of the driver which is a strong function of the coil's inductance (and how it varies with current and position). After the initial rise-time, however, mass becomes a player in transient response and, accordingly, upper frequency extension.

So the proper conclusion to draw is that inductance is a dominant factor, and mass is of secondary import.

That strongly supports my association with a high degree of resolution (though, another factor involved with that would also be the decay time) but it also brings up something I missed in my previous post regarding the relationship between mass and frequency extension. Thanks for correcting me. So with a given mass-limited high frequency response, could you then extend the frequency response by simply overcoming the mass with more motor force/acceleration, assuming everything else remains static, or are you locked in to that response profile by the amount of mass alone? I'm probably reaching here.

You are correct, motor force plays a large role in how mass affects final performance. And, I thank you for your confidence in me, but I learn new things here all the time. Many times from you.

Thanks for the info, greatly appreciated.

 

[T3mpest 10+ year member]

That strongly supports my association with a high degree of resolution (though, another factor involved with that would also be the decay time) but it also brings up something I missed in my previous post regarding the relationship between mass and frequency extension. Thanks for correcting me. So with a given mass-limited high frequency response, could you then extend the frequency response by simply overcoming the mass with more motor force/acceleration, assuming everything else remains static, or are you locked in to that response profile by the amount of mass alone? I'm probably reaching here.

I would think a higher amount of BL would help correct any over or under shoot by the driver due a the extra mass, just as a higher Bl allows the driver to overcome essentially the same forces in reverse near tuning. I can't see any physical why it would be an inherent factor due to the new mass, you simply need enough force to control it.

 

[audioholic 5,000+ posts]

Keep in mind, a consistent, stable BL force is also important in this respect. As we all know, conventional drivers lose BL force as the coil leaves the gap, where as BL optimized drivers do not.

 

[Toxic Tuan 10+ year member]

I would think a higher amount of BL would help correct any over or under shoot by the driver due a the extra mass, just as a higher Bl allows the driver to overcome essentially the same forces in reverse near tuning. I can't see any physical why it would be an inherent factor due to the new mass, you simply need enough force to control it.

That has always been the traditional way...increase BL. I think it's time for people to think outside of the box. Low mms for efficiency with a super strong motor and let the box do the work rather than the woofer.

Tuan

 

[Papermaker85 5,000+ posts]

so what box you going to use..

 

[pedro123 10+ year member]

who sells recones for these ?

 

[Kyle_Keating 10+ year member]

I would think a higher amount of BL would help correct any over or under shoot by the driver due a the extra mass, just as a higher Bl allows the driver to overcome essentially the same forces in reverse near tuning. I can't see any physical why it would be an inherent factor due to the new mass, you simply need enough force to control it.

over or undershoot is not appropriate for speakers... you can't overshoot a sinwave input, you can play it louder (higher acceleration due to higher sensitivity or power) or softer (opposite) or you can have a distorted waveform from non-linearity (many kinds of that that range from suspension, BL, etc.) Note: inductance is NOT distortion, but we can have non-linear inductors which invoke distortion - very difference concept. Keep in mind, any time you put a low pass crossover on your sub, you're adding the same thing an inductor does. Generally the inductance of a speaker motor is not that linear and we really want to eliminate it from the network or minimize it or avoid frequencies that is affects for that reason.

 

[bhsdriller 10+ year member]

I have no idea what you guys are talking about, but interesting read

 

[BassAddictJ 5,000+ posts]

lmao. I wish I just had a XXX lying around in "storage."

x2 lol