Impedance of Speaker+Tweeter via NP-cap - diyAudio
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Old 9th November 2009, 05:11 AM   #1
kroto is offline kroto  Indonesia
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Default Impedance of Speaker+Tweeter via NP-cap

i've been searching, but did'nt find any similar thread.

I'm a bit confused with this config(on the attachment file), what is the impedance if Woofer // tweeter via NP-Cap?
advise please?

best regards.
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Old 9th November 2009, 09:09 PM   #2
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4 ohms at HF, 8 ohms at LF and a transition between the 2 at the X-over point.

dave
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Old 9th November 2009, 10:16 PM   #3
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I would just call it 8ohms Yes the impedence of the woffer and the tweeter will be
in // at high frequencies but at high frequencys the woffer impedience will be so high
that the combined impedience won't be much below 8 ohms.
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Old 10th November 2009, 02:09 AM   #4
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Quote:
Originally Posted by woody View Post
I would just call it 8ohms Yes the impedence of the woffer and the tweeter will be in // at high frequencies but at high frequencys the woffer impedience will be so high hat the combined impedience won't be much below 8 ohms.
What woody says is usually the case, but there are some FRs (FF85, FE206, many of the Mark Audio) that have pretty flat impedance above resonance.

Click the image to open in full size.

FRs with this kind of impedance typically don't need a tweeter.

dave

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Old 12th November 2009, 03:20 AM   #5
kroto is offline kroto  Indonesia
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Quote:
Originally Posted by dave slagle View Post
4 ohms at HF, 8 ohms at LF and a transition between the 2 at the X-over point.

dave
it seems like 10u and RL2 form as HPF (1/2.p.RL2.10u), so the Xover is at ~2kHz?
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