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Multi-Way Conventional loudspeakers with crossovers

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Old 6th September 2012, 07:14 AM   #1
moss99 is offline moss99  United Kingdom
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Hi all
I have tried to send this message to mission but cannot get a reply wondering if you guys could help ...

Hi I have a pair of mission 35i and the sound quality has got gradually worse recently,
I have looked at the crossovers and found the capacitor C1 quite bulged
on the top, would this cause the poor sound quality?.
written on the cap is 8u2. 63v
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Old 6th September 2012, 08:58 AM   #2
mondogenerator is offline mondogenerator  England
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yes that electrolytic capacitor is burst, probably dried out and over voltaged. Someone was playing them LOUD!
just replace the electrolytic 8.2 uF with another, maybe 100V rated instead, and it will be good as new.
Thats presuming the tweeter hasnt been damaged ay the failing capacitor. Replace it, listen and hope
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I must be a child of good times... the scariest thing I've seen done thus far, has been connecting a cathode bypass capacitor reverse polarity...Then rushing to cut the HT!

Last edited by mondogenerator; 6th September 2012 at 09:01 AM.
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Old 6th September 2012, 10:17 AM   #3
moss99 is offline moss99  United Kingdom
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Thanks for the reply is that a normal way for the cap to be labelled as I wasn't sure of the value ? Also I tested by various methods. My analogue ohm meter needle did kick but only a little bit , my esr meter couldn't read it at all , and I've just got a pair of smart tweezers they seemed to be all over the place ,,
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Old 6th September 2012, 12:36 PM   #4
mondogenerator is offline mondogenerator  England
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yes 8u2 is 8.2uF. Similarly to a resistor label, 1R1 would be 1.1 Ohm. Id suggest replacing the capacitor with a 8.2uF electrolytic 80V or 100V rating, and a non-polarised type. It should be easy to find at maplins, or online at CPC or Farnell, or RS. You may as well replace this part in BOTH speakers. It would be worth checking the box with the duff cap, after replacement, so you can check the tweeter hasnt been damaged.
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I must be a child of good times... the scariest thing I've seen done thus far, has been connecting a cathode bypass capacitor reverse polarity...Then rushing to cut the HT!
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Old 6th September 2012, 04:14 PM   #5
Bare is offline Bare  Canada
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Suggest an inexpensive Film and Foil capacitor instead :-)
Close to the rated uF is 'good enough' IMO given the usual 20% tolerance/variance of those things.
But DO change in both speakers.
Do you really need to be so frugal as to replicate it with a proven lo quality failure prone part?
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Old 6th September 2012, 07:40 PM   #6
moss99 is offline moss99  United Kingdom
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found these :
Buy Aluminium Capacitors FC radial elec cap 8.2uF 100V Panasonic EEUFC2A8R2 online from RS for next day delivery.

but its 20 for postage do you know anywhere in uk that ships small quantities for realistic postage charges ?
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Old 6th September 2012, 08:01 PM   #7
Salas is offline Salas  Greece
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Found something on ePay for you. 1.083$ each when shipping is payed for. They are sold as batch of 10, maybe you can sort out a matched best value pair. Film caps are a beguiling option but in such budget networks some cheapo electrolytic ESR is probably designed in.
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Old 6th September 2012, 08:06 PM   #8
Cal Weldon is offline Cal Weldon  Canada
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8.2 fd

the is 'option m" on a mac.
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Old 7th September 2012, 07:17 AM   #9
moss99 is offline moss99  United Kingdom
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Quote:
Originally Posted by Salas View Post
Found something on ePay for you. 1.083$ each when shipping is payed for. They are sold as batch of 10, maybe you can sort out a matched best value pair. Film caps are a beguiling option but in such budget networks some cheapo electrolytic ESR is probably designed in.
thanks for that, although the pin configuration for these is in line i think i may struggle to get these onto the board as there are several other components close to its location
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Old 7th September 2012, 07:18 AM   #10
moss99 is offline moss99  United Kingdom
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Quote:
Originally Posted by Cal Weldon View Post
8.2 fd

the is 'option m" on a mac.
Thanks for the info i will try that next time im on my laptop (pc is windows)
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