Eminence Delta 12LFA is 10 ohm nom?!

geminni · 10th July 2007, 12:40 PM

WinISD sometimes makes me wonder.... I have entered numerous speaker parameters and for some of them for "Znom" is 10 ohm, and some even 12ohm. Why is that? For those 12ohm is not so surprising for me, because those are some cheap chinese speakers but for Eminence Delta 12 LFA WinISD shows 10ohm. Here is the picture.

Petriej · 10th July 2007, 04:37 PM

Ten Thousand Ohms??

I know I know.... I just had to.

Although it does seem out of the ordinary, I can't see why it would be a big problem, most amps don't care if its between 4 and 16ohms, right? (Maybe even higher?)

It does have pretty good SPL...
Maybe it is a misprint. Contact the MFG'er

geminni · 11th July 2007, 06:49 AM

It is not misprint because WinISD calculates Z nominal. I thought that Znom is 4 or 8 ohms because Z nominal is voice coils R dc and L mh.
I have been repairing some boxes where were cheep chinese speakers which had Rdc of 7,7 ohm to even 8,1 ohm!!! When you add the L from voice coil that shows at the end some 12ohm Z nominal.

So, if speaker is 10ohm nominal, or better to say has voice coil of 7,7 R dc, which is not common for 12" pa speaker with 10cm voice coil diameter, can it be made to be some 6,7 R dc,? When i replace that 7,7 with 6,7 orm in winISD then the SPL is higher

This is not for Eminence, this is some other speaker.

10th July 2007, 04:37 PM	#2
Petriej diyAudio Member Join Date: Jun 2007	Ten Thousand Ohms?? I know I know.... I just had to. Although it does seem out of the ordinary, I can't see why it would be a big problem, most amps don't care if its between 4 and 16ohms, right? (Maybe even higher?) It does have pretty good SPL... Maybe it is a misprint. Contact the MFG'er __________________ Signature: Optional signature you may use to appear at bottom of your signatures.

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11th July 2007, 06:49 AM	#3
geminni diyAudio Member Join Date: Dec 2006	It is not misprint because WinISD calculates Z nominal. I thought that Znom is 4 or 8 ohms because Z nominal is voice coils R dc and L mh. I have been repairing some boxes where were cheep chinese speakers which had Rdc of 7,7 ohm to even 8,1 ohm!!! When you add the L from voice coil that shows at the end some 12ohm Z nominal. So, if speaker is 10ohm nominal, or better to say has voice coil of 7,7 R dc, which is not common for 12" pa speaker with 10cm voice coil diameter, can it be made to be some 6,7 R dc,? When i replace that 7,7 with 6,7 orm in winISD then the SPL is higher This is not for Eminence, this is some other speaker.

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