capacitors inline with tweeters |
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Earplug
Old Croc Joined: 03 January 2012 Location: Europe Status: Offline Points: 7216 |
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Posted: 19 April 2017 at 10:13am |
Thank you. That was my point from the beginning. Was the cap for protection - or to set crossover point. I´ve seen cheapo hifi tweeters sold with a small crossover cap already fitted, but never anything for a big system. And the quality of the thing is most probably crap, ie cheap bipolar electrolytic that will soon fail and destroy the tweeter. |
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toastyghost
The 10,000 Points Club Joined: 09 January 2007 Location: Manchester Status: Offline Points: 10919 |
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That's what has been asked for though, the OP has already said the section is crossed at 7kHz so why would you want another filter at 9kHz??
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I-shen Soundboy
Registered User Joined: 21 December 2016 Location: Big Smoke Status: Offline Points: 375 |
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Yup, 22uf gives a 6db slope at 900hz For an 8 ohm driver.
So no attenuation above 900hz and precious little below. 22uf would be OK as a DC protection capacitor for tops ACTIVELY crossed at 1.6k or above. Useless as a 1st order passive for anything less than a very quiet 2". And even then... |
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Dub Specialist Sound
Old Croc Joined: 15 November 2013 Location: Smethwick Status: Offline Points: 4873 |
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Dont yu mean 1.5uf 2.2uf
?? going by catulator chart 2.2uf is around 9k maybe me the way i understand it
Edited by Dub Specialist Sound - 18 April 2017 at 9:06pm |
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Earplug
Old Croc Joined: 03 January 2012 Location: Europe Status: Offline Points: 7216 |
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msoundsystem
Young Croc Joined: 10 November 2011 Location: wales Status: Offline Points: 625 |
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It's passive mate. Thanks for the help. Will give 22uf ago! Will post results when iv made these mods. Peace ✌
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Earplug
Old Croc Joined: 03 January 2012 Location: Europe Status: Offline Points: 7216 |
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You´re crossing over at 7kHz (BTW, is that active or passive?) - and then adding in another -3dB point at 9kHz. That´s pointless and obviously will add an extra, unnecessary phase shift. Use a decent 15uF or 22uF capacitor for overall protection. |
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jbl_man
Moderator Group Joined: 12 January 2005 Location: London. Status: Offline Points: 11155 |
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The one situation where i would use caps for HF protection is on bullet tweeters,just to protect against wrong connection,ie,plugging them into the mid amp section by mistake etc,it can happen. Or of course your DSP crossover going tits-up and frying them.
If you must use capacitors,use the pukka hi-fi grade audio caps (non-polarised),they tend to be quite pricey for what they are,but should give you some peace of mind. |
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msoundsystem
Young Croc Joined: 10 November 2011 Location: wales Status: Offline Points: 625 |
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In what way will they interfear with the phase? What value would you recommend for one cap inline on 4 tweeters? Each tweeter receiving 100watts ish, the link u sent me had the voltage of caps,not the UF. Cheers for the help.
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Earplug
Old Croc Joined: 03 January 2012 Location: Europe Status: Offline Points: 7216 |
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Then those 2.2uf are going to interfere horribly with the phase - get rid of them and just put one capacitor in line. Have a look here: http://forum.speakerplans.com/amplifier-dc-on-2-hf-drivers-coupling-caps_topic98242.html |
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Elliot Thompson
Old Croc Joined: 02 April 2004 Location: United States Status: Offline Points: 5174 |
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Hi. You will need one capacitor per pair as you are following the series-parallel scheme. Bear in mind the resistance of two speakers wired in series will increase so, you will need to recalculate the proper capacitor to attain the same roll-off point as if you were wiring one tweeter parallel. You can also calculate the total resistance of all the tweeters wired in the series-parallel scheme and, use one large (in value) capacitor. Best Regards, Edited by Elliot Thompson - 16 April 2017 at 11:04am |
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Elliot Thompson
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msoundsystem
Young Croc Joined: 10 November 2011 Location: wales Status: Offline Points: 625 |
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Sorry should of said they are being cut at 7k on processor. Caps It's what came with them, iv always installed them on every set iv had with no issues. Just added protection I guess. One cap on input or one cap on each tweeter is what I'm wondering.. Thanks mate
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