12'' drivers Distortion measured! <link>

[mikee12345]

very GOOD!
ACTUAL TEST
how does one find compression ? compare expected SPL in relevant pi space,and measure with corrent power in?

http://www.mfk-projects.com/woofer_data.htm#dpl12


shiva, XLS ,DPL12,titanic

 

[mikee12345]

any comments?

 

[tiroth]

Do these results translate to sealed/vented box usage, or are they really only relevant for IB usage?

 

[mikee12345]

box=its own distortion types..

that is why i asked for comments

the way i understand it-
if it has lower distortion than an IB the distortion will be the SAME but REDUCED in whatever box type you choose

eg ported box less excursion-but brings its own ported characteristic

and sealed box woofer will exhibit more of that distortion + over-ring <sealed box characteristic>

i think that open baffle testing is good,also it would be good to compare to sealed box testing..aslong as everyone does it the same way~!

my JBL2226h although used in ported boxes,has distortion measured on a 300L sealed box

http://homepages.slingshot.co.nz/~mike.e/DISTORTIOn.jpg

notice how the DPL12 has way less like -20db distortion at certain frequencies compared to SHIVA <which btw im buying for a mates basshorn design>

 

[roddyama]

Mike,

Great work.

It would be interesting to see what % of full excursion each driver is traveling when it's producing the distortion in the graphs.

 

[mikee12345]

heh its not my site-i just found it

i would liek to do a comparable test with my JBL

but remember-since most of them are 12''s,the area will be reasonably similar,and with same V in,excursion shouldnt be too dissimilar.am i correct?

i think also should compare with max Xmax distortion-if it were possible to measure,perhaps the Distortion increases suddenly,or hitting the back plate