| How do I measure the Le of a speaker? [message #18695] |
Wed, 05 April 2006 09:06  |
Tre'
Messages: 34
Registered: May 2009
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Baron |
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"Le
This is the voice coil inductance measured in millihenries (mH). The industry standard is to measure inductance at 1,000 Hz. As frequencies get higher there will be a rise in impedance above Re. This is because the voice coil is acting as an inductor. Consequently, the impedance of a speaker is not a fixed resistance, but can be represented as a curve that changes as the input frequency changes. Maximum impedance (Zmax) occurs at Fs."I'm trying to implement a Zobel on a Trusonic FR80. I would like to find the TS's for this speaker. Thanks...Tre'
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| LCR meter [message #18697 is a reply to message #18696] |
Wed, 05 April 2006 18:35  |
spkrman57
Messages: 522
Registered: May 2009
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Illuminati (1st Degree) |
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Like from Parts Express. I use mine often for testing tolerence of caps and coils! Ron
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| Re: How do I measure the Le of a speaker? [message #18702 is a reply to message #18695] |
Thu, 06 April 2006 17:02 |
Martin
Messages: 220
Registered: May 2009
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Master |
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Unfortunately, the effective Le and Re of the speaker's voice coil are going to change with increasing frequency. Fortunately, the Zobel circuits are not that sensitive so getting a Le and Re result at 1 kHz is good enough for sizing the Zobel. This is why there is typically a 25% factor in the rule of thumb equations for calculating the Zobel's capacitance and resistance. Martin
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