The below are the Large Signal Parameters tested per a klippel analyzer performed by Patrick Turnmire with Redrock Acoustics.  For those who do not know what large signal parameters are, they are Thiele Small Parameters of the driver with a large enough signal to excite the cone to normal operating conditions.  These are used instead of typical small T/S parameters because they more accurately represent the driver.  When the driver is under power at large excursions the parameters can shift a great deal making small signal parameters not an accurate representation of the true nature of the transducer.  Later when I get time I will also post small signal parameters to compare to see how greatly the difference there can be in a given enclosure.

 

 

Ethos 15 dual 2 ohm subwoofer

 

Re        3.99 (series)

Qms     6.69

Qes      .57

Qts       .53

Fs         28.6

Mms     362.9

Cms     .09 mm/N 

BL        23.15

Vas      78.0361 liters

Sd        804.25 cm^2

SPL      87.7 1W/1M

xmax     32mm one way based on 70% BL 

RMS power    still to be determined  power confirmation expected to be complete 9/20/2013.   Testing was done with 2,500 watts rms and the analyzer hit limits due to "running out of preamp" so it will be re-ran.  Expect rating to be ~1,800 rms

 

 

 

 

 

Below is a jpeg of three different enclosures

 

GREEN           recommended ported enclosure for car audio applications

YELLOW        sealed enclosure with system QTC of .7

BLUE              ported maximumly flat response with lowest possible f3,  maybe for home theater applications?    

 

 

 

 

Edited September 21, 201311 yr by Quentin Jarrell

picture added.  In case it is hard to see the "green" box is 3 cubic feet

nice!