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your favourite bypass caps
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Re: your favourite bypass caps
I think the value of a bypass capacitor in speaker crossovers is of dubious value. I talked to an electrical engineer who surmises that adding a small bypass capacitor in parallel essentially adds that % of attributes to the total capacitance. So for example, if you are using 0.1 uF Sonicap and 6.8 uF Solen Cap, your total capacitance circuit will have 98% the characteristics of the Solen and 2% of the Sonicap. What's worse, using 2 very different capacitors in parallel can lead to smearing of the signal.
Here's some reading for you:
http://www.diyaudio.com/forums/power...ml#post2257381
I know that Danny Ritchie recommends Sonicaps as bypass capacitors and they are relatively affordable. His opinion and experience (personal and professional) dwarfs mine. Troels Graveson uses pretty high-end caps in his designs, and I've never seen him using a bypass. YMMV, etc.
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Re: your favourite bypass caps
Thanks, it makes a lot of sense but its all a bit over my head. I can't help noticing a few Tech Talk guys swear it offers dramatic improvements. Thinking to go with basic Evo caps for now and if inclined, experiment at a later date with small value PIO's
Read this earlier which made the whole thing sound quite hit and miss http://audiophile-musings.blogspot.c...apacitors.html
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Re: your favourite bypass caps
Despite shift in Dollar to pound value: I've never spent that much on a cap.
Over the decades I've acquired bags of caps; including ones on sales like small value Polypropylene, Solens etc. which I've used to trim up.
Sometimes from Madisound."Not a Speaker Designer - Not even on the Internet"
“Pride is your greatest enemy, humility is your greatest friend.”
"If the freedom of speech is taken away, then dumb and silent we may be led, like sheep to the slaughter."
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Re: your favourite bypass caps
I once purchased a handful of 0.1uF PIO caps on ebay to try as "bypass" caps. They were sprague "vitamin Q". I found the difference they made pretty negligible, that was quite a few years ago and not used on quite the hifi system I have today. I may try them again sometime, they're just sitting in a drawer collecting dust now.
Recently I haven't bothered with bypasses and just use whatever inexpensive poly cap is available, for me its usually the Solen brand. For larger sizes, I go with electrolytic, but I find that using several smaller caps in parallel is better than using one single large one. Differences in tolerance average out and you get closer to your intended capacitance.I'm not deaf, I'm just not listening!
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Re: your favourite bypass caps
Originally posted by bill poster View PostI don't intend to either! The pain of having to go with a 3rd order over a 2nd"Not a Speaker Designer - Not even on the Internet"
“Pride is your greatest enemy, humility is your greatest friend.”
"If the freedom of speech is taken away, then dumb and silent we may be led, like sheep to the slaughter."
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Re: your favourite bypass caps
Decent fairly high value polypropylene film caps are available as motor-run capacitors. They have no audio pedigree, but for larger values they offer some economy, especially if you find them surplus on eBay etc. I have several and have measured them, they are very high quality low loss etc. Be aware that motor-start caps are often electrolytic, not polypropylene.
Some examples:
http://www.ebay.com/sch/i.html?_from...citor&_sacat=0Francis
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Re: your favourite bypass caps
Give this a try: http://www.hificollective.co.uk/cata...ne-p-5224.html
If you want to go for the gusto: http://www.hificollective.co.uk/cata...ne-p-8698.html"He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche
http://www.diy-ny.com/
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Re: your favourite bypass caps
Yes ESA's or EVO oil are good caps and good value.
or thishttp://www.ebay.com/itm/Capacitor-PI...-/131050392270
Rike S caps are what I wanted to try but an 18uf is out of my budget. Thats when I thought about bypass caps
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Re: your favourite bypass caps
There's also this: http://www.hificollective.co.uk/cata...ne-p-7784.html
Never been a fan of bypass caps."He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche
http://www.diy-ny.com/
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Re: your favourite bypass caps
http://www.parts-express.com/audioca...citor--027-710
Thought it worked well for a tweeter high pass.
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Re: your favourite bypass caps
Not all of us agree with Danny Ritchie.
Originally posted by djkest View PostI think the value of a bypass capacitor in speaker crossovers is of dubious value. I talked to an electrical engineer who surmises that adding a small bypass capacitor in parallel essentially adds that % of attributes to the total capacitance. So for example, if you are using 0.1 uF Sonicap and 6.8 uF Solen Cap, your total capacitance circuit will have 98% the characteristics of the Solen and 2% of the Sonicap. What's worse, using 2 very different capacitors in parallel can lead to smearing of the signal.
Here's some reading for you:
http://www.diyaudio.com/forums/power...ml#post2257381
I know that Danny Ritchie recommends Sonicaps as bypass capacitors and they are relatively affordable. His opinion and experience (personal and professional) dwarfs mine. Troels Graveson uses pretty high-end caps in his designs, and I've never seen him using a bypass. YMMV, etc.
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Re: your favourite bypass caps
Originally posted by killa View PostI'm wondering, say you use a 4uf cap bypassed with a high dollar fancy 1uf cap, wouldn't the "magic" only be in what the 1uf cap lets through? Kind of similar to what djkest was saying."He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche
http://www.diy-ny.com/
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