speaker box problem

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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
According to dcr of both of the drivers being 3.5 vs. 3.57,
those are 4 ohm and interchangable. TS parameters are

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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No matter what nominal impedance is specified, Re of the Peerless 830500 always has been 3.5 ohm. Your old drivers actually were 4 ohm too.

The large voice coil inductance prevents the impedance from falling below 4.7 ohm. That's possibly the reason someone in the past decided to call it an 8 ohm driver.
You are all right to use the same box. Although the older version
has Le= 4,2 mH, the newer L= 0,7 mH, the inductive reactance
(Impedance plot) is similar with both versions, one has logarithmic
scale, the other linear.
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Joined 2007
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.
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