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4 ohm parameters vs 8 ohm

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studio45 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote studio45 Quote  Post ReplyReply Direct Link To This Post Topic: 4 ohm parameters vs 8 ohm
    Posted: 01 April 2019 at 2:56pm
This may well have been asked before but the search isn't bringing anything up, so - Is there a way to infer or calculate the T/S parameters of the 4 ohm version of a given driver, from the parameters for the 8 ohm version?

Just been trying to work out if I should get 4 ohm bass drivers for the mobile rig - but having trouble doing any simulations, as only B+C seem to correctly list the specs of their 4 ohm offerings, whereas everyone else just copies and pastes the specs from the 8 ohm version! B+C being at the very top end of my possible budget...

So can they be worked out, or would only the mfr know? Confused
Studio45 - Repairs & Building Commotion Soundsystem -Mobile PA
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DMorison View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DMorison Quote  Post ReplyReply Direct Link To This Post Posted: 03 April 2019 at 1:42pm
Best bet is to contact the manufacturer, as the process of changing the coil wire thickness/number of turns to change the nominal impedance may end up changing other parameters like moving mass and motor strength.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Crashpc Quote  Post ReplyReply Direct Link To This Post Posted: 25 June 2019 at 6:47pm
no, it is not possible to count. Different impedance driver can be... Well, completely different... 
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odc04r View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote odc04r Quote  Post ReplyReply Direct Link To This Post Posted: 26 June 2019 at 8:45am
As said, could be the same if engineered to be or could be completely different depending on how voicecoil wire is wound between driver versions.
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Elliot Thompson View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Elliot Thompson Quote  Post ReplyReply Direct Link To This Post Posted: 26 June 2019 at 4:19pm
If you already own the driver, you can measure it yourself using ARTA/LIMP or REW. Even published manufactures TS Parameters are subject to change based on the materials they upgrade to if the driver has a high failure rate in which, can be rectified.

There is no reason to guess what the TS Parameters is any more when there a programs that will allow you measure them yourself. I might add, all drivers TS Parameters will change from the manufactures published specifications once the driver is broken in.

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Elliot Thompson
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