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Unity horn build
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Teunos View Drop Down
Old Croc
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Joined: 23 November 2008
Location: The Netherlands
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Points: 1793 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Teunos Quote  Post ReplyReply Direct Link To This Post Posted: 06 April 2021 at 3:15pm
This one you need to explain to me; why would electrical damping at low frequencies be a problem if you insert a DC blocking cap?
Off course presuming that it is really meant as "last resort HPF protection in case i insert the wrong speakon" or "my amp crapped the bed and really put out DC on the speaker output", or maybe "I wrongly configured the output matrix mixer of my DSP and sent bass to the tweeters". (which are the 3 primary reasons i use them on all HF drivers).

DC blocking cap HPF corner frequency should be chosen well below the intended passband of the speaker.
As long as you maintain that rule (I suggest at least an octave below the intended passband), there is absolutely no noticeable impact on damping factor whatsoever. 


Edited by Teunos - 06 April 2021 at 3:24pm
Best regards,
Teun.
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fatfreddiescat View Drop Down
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Points: 1060 		Post Options Post Options   Thanks (0) Thanks(0)   Quote fatfreddiescat Quote  Post ReplyReply Direct Link To This Post Posted: 06 April 2021 at 4:18pm
With a blocking cap the comp driver is partially decoupled from the amplifier due to the series impedance. This could be a problem due to the comp sharing a waveguide with the mid drivers as the SPL is very high at the throat of the waveguide, the pressure from the mids can cause the comp diaphragm to modulate excessively potentially damaging it. By coupling it directly to the amp or having a low impedance path across it's terminals, the diaphragm will be better damped and should help to reduce the modulation.
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snowflake View Drop Down
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Points: 3096 		Post Options Post Options   Thanks (0) Thanks(0)   Quote snowflake Quote  Post ReplyReply Direct Link To This Post Posted: 07 April 2021 at 12:32am
Originally posted by fatfreddiescat fatfreddiescat wrote:

With a blocking cap the comp driver is partially decoupled from the amplifier due to the series impedance. This could be a problem due to the comp sharing a waveguide with the mid drivers as the SPL is very high at the throat of the waveguide, the pressure from the mids can cause the comp diaphragm to modulate excessively potentially damaging it. By coupling it directly to the amp or having a low impedance path across it's terminals, the diaphragm will be better damped and should help to reduce the modulation.


the compression drivers have an inductor across them so they will be damped at low frequencies. It is the mids I was worried about as cap was between them and the amp.

Unless you are using amps that are clipping badly and putting out DC, the DC blocking caps will not help and possibly make things worse. My amps have clip limiters and enough headroom that they never clip anyway.
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pappdani7 View Drop Down
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Points: 1 		Post Options Post Options   Thanks (0) Thanks(0)   Quote pappdani7 Quote  Post ReplyReply Direct Link To This Post Posted: 26 October 2022 at 8:36pm
Hello! Perfect work! 

Could you share the plans of the speaker? 
I would like to build my own so i would gladly pay for it as well. 
My email address:  mailto:pappdani7@gmail.com - pappdani7@gmail.com 
Thank you very much!
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