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PD 1550 Impedance Graph

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Category: General
Forum Name: Electro Frying Forum
Forum Description: Talk about drivers, processors and mixers
Printed Date: 09 June 2023 at 12:24pm
Software Version: Web Wiz Forums 12.06 -

Topic: PD 1550 Impedance Graph
Posted By: shaun1264
Subject: PD 1550 Impedance Graph
Date Posted: 12 January 2022 at 11:09am" rel="nofollow -

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?

Posted By: smitske96
Date Posted: 12 January 2022 at 11:26am
I think its a mistake in the specsheet, impedance graph is probably free air.

Posted By: shaun1264
Date 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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