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PD 1550 Impedance Graph

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shaun1264 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote shaun1264 Quote  Post ReplyReply Direct Link To This Post Topic: PD 1550 Impedance Graph
    Posted: 12 January 2022 at 11:09am

Ive got two of the 16ohm versions of these working nicely in a in 75L bass reflex enclosure.  Looking at the impedance graph of these drivers I notice how steep and high the impedance goes (on the 8ohn) version compared to a lot of other drivers like the JBL 2226.  Any reason why this large peak over 250ohms (in a 107L vented enclosure according to the spec sheet) is so high?
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smitske96 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote smitske96 Quote  Post ReplyReply Direct Link To This Post Posted: 12 January 2022 at 11:26am
I think its a mistake in the specsheet, impedance graph is probably free air.
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shaun1264 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote shaun1264 Quote  Post ReplyReply Direct Link To This Post Posted: 12 January 2022 at 12:26pm
On the 'new' version of this driver they have the same Thiele Small Parameters and graphs but this time measured in a 975 litre box!

So it seems rather confusing and misleading or clear glaring errors in the measuring or marketing department! But that is still a huge peak on impedance even it's an free air
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