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Old 30th January 2014, 08:25 PM   #1
lucadelcarlo is offline lucadelcarlo  United Kingdom
diyAudio Member
Join Date: May 2009
Location: Taipei
Default Using MiniDSP with Capacitor for Tweeter Protection

When working on speaker designs, sooner or later wires will inadvertently cross and ruin a HF unit. As backup protection with the 4 and 6 ohm tweeters I'm using, actively crossed between 2–3kHz, I'm considering a 20-33uF cap. After reading through several of the longer threads concerning use of a cap for added protection while working with the MiniDSP, I could still use clarification on two points:

1. Are more expensive poly caps advisable, i.e. does quality make any difference when it's coming into play only well below the active x-over frequency?

2. Does the cap still create an audible phase shift above the active x-over point?

Thanks in advance,

Last edited by lucadelcarlo; 30th January 2014 at 08:30 PM.
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Old 30th January 2014, 08:34 PM   #2
sreten is offline sreten  United Kingdom
Join Date: Nov 2003
Location: Brighton UK

1. Not really but some will argue it does.
2. Not really with those sort of values.

Neither matter if once settled you remove it.
If your going to keep it, use smaller capacitors
and simply modify the DSP high pass to suit.

rgds, sreten.
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Old 30th January 2014, 08:37 PM   #3
CharlieLaub is offline CharlieLaub  United States
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Join Date: Mar 2007
Location: California
Using MiniDSP with Capacitor for Tweeter Protection
The cap is just in series with the driver's impedance, and so forms an RC filter. If you measure the impedance and import it in to the program "Passive Crossover Designer" you can add the cap and then see how the phase changes. In this way you can answer the question for yourself in the future - knowledge is power!

Otherwise, I would agree with Sreten's comments.
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Old 30th January 2014, 09:08 PM   #4
laplace is offline laplace  Australia
diyAudio Member
Join Date: Jan 2014
Concurrent and directly related thread...

Motor-start capacitors seem to be the best $/performance ($10 for 40uF MKP) though I don't know what their parasitic L is.
Open-Source F/Stop Timer
on flickr
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