One good reason for it is when the RF clamp circuit fires the SCR shorts the input of the speaker and the only thing between it and a complete dead short is that resistor and cap combo. As we’ve said it’s effectively a short at higher frequencies but does provide a bit of a load to the amp down at low frequencies and DC.
It’s insanity that quad said “short the input” upon sensing problems rather than “open the input”
Sheldon
It’s insanity that quad said “short the input” upon sensing problems rather than “open the input”
Sheldon
I have removed my clamping circuit completely since many years back. Also shorted the RC circuit.
It´s easier for us with dipole woofers (like gradient or DIY) who has 100Hz high pass filter since it gives room for approx 10dB higher headroom before arching.
And if it goes plasma high wire... just fix new panels! 😎
It´s easier for us with dipole woofers (like gradient or DIY) who has 100Hz high pass filter since it gives room for approx 10dB higher headroom before arching.
And if it goes plasma high wire... just fix new panels! 😎
Thanks, Good People; nothing here I hadn't worked-out, but I very much appreciate the sense-check before potential future surgery.
(when I did take a look, a few years ago in my 989s - I did throw a 10uF polyprop across the tiny 220uf bipolar electrolytics. It certainly did no harm.
Wima MKP4/400v iirc... nice and compact for such a thing, and comes already-potted in a rigid case - in exactly the way most audiophool caps do.not. )
(when I did take a look, a few years ago in my 989s - I did throw a 10uF polyprop across the tiny 220uf bipolar electrolytics. It certainly did no harm.
Wima MKP4/400v iirc... nice and compact for such a thing, and comes already-potted in a rigid case - in exactly the way most audiophool caps do.not. )
Recently stumbled on some images in an old Speaker Builder article showing the inductors being wound and prepared for potting and thought there might be some interest in seeing them.
Enjoy!
Attachments
Nice! From the pic caption I guess this is from Speaker Builder 1982?
Do you know which issue?
Jan
Do you know which issue?
Jan
Yes, it was the 1/1982 Issue. I should have mentioned that.
Not much new to learn from the article, but if interested send me PM and I can forward you a copy.
* * * NOTE * * *
Currently looks like a lot of the SB issues are available for download here:
https://www.worldradiohistory.com/Archive-All-Audio/Speaker-Builder.htm
Not much new to learn from the article, but if interested send me PM and I can forward you a copy.
* * * NOTE * * *
Currently looks like a lot of the SB issues are available for download here:
https://www.worldradiohistory.com/Archive-All-Audio/Speaker-Builder.htm
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