speaker box problem

i haave been using a peerless 12'xls 830500 for years have not a problem with it until someone broke it
my problem is that i cant find a 830500 8 ohms driver
to make matter worse .the australia distributors have 2 different catalogs one have the old driver and in the other it has the new 4 ohm version
I Rang them they are not sure which one the right i am looking to find out do i have to build a new box my current box is 45l port is 70x112mm 865mm long designed by a long time poster here rabbitz

the old specs http://www.d-s-t.com.au/data/Peerless/830500.pdf

the new specs
Transducer Detail | Tymphany

could some one point me the direction thank you
 

Lojzek

Member
2012-02-10 12:12 pm
Croatia
According to dcr of both of the drivers being 3.5 vs. 3.57,
those are 4 ohm and interchangable. TS parameters are
similar.

edit: Impedance plot of the older ( 8 ohm) driver looks
like it is an 8 ohm version, having the curve hit 5 ohm
in 100 Hz region, so it's either a typo in the spec sheet
or the plot isn't right.

Dissi is right. Both of the products are 830 500.
PE used to sell that unit, and they called it nominally 4 ohm.
 
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The 3.5 vs. 3.57 is very well within the normal tolerances. Besides that, the newer specs sheed was measured again and such differences are normal, even if you use the same driver, depending on the measurement setup. Besides that, even different air pressure and temperature cause different measurements in the parameters. Sure, the Re wouldn't be affected by that but as I said, the normal tolerances are covering that, 10% tolerance (typical) are equal to 0,35 Ohm divergence after all.