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Wharfedale Mach 9 I need capacitor values

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Posted on July 31, 2022 at 08:52:57
dark25.mc@gmail.com
Audiophile

Posts: 5
Joined: July 31, 2022



Hi everyone,

I have a pair of Wharfedale Mach 9.
In the past while I was turning on my amplifier, only one Wharfedale Mach 9 loudspeaker sounded Intermittent.
Looking for the problem, I focused on tone controls.
I tried cleaning them with deoxidant spray, but unsuccessful, the loudspeaker continued to crackle.
So I decided to bypass them with a fixed resistor.
This is the only intervention I made!
Recently two things happened:
While I was listening some music the sound came out distorted and almost dirty.
In May this year, tweeter started crackling, I am pretty sure about the tweeter, but in addition to it, I think the midrange too.
There are two situations: speakers or bad capacitors.
I did my tests: I inverted the tweeter, from one loudspeaker to the other, I totally bypassed the LED circuit and the protection one on the right position and I inverted loudspeakers place.
Everything was fine.
Recently I decided to re-enabled the two circuits and everything was fine, until the problem reappeared.
Now I made a further listening test: I have still disabled all the circuits, inverted the loudspeakers place and the problem once again disappeared.
Having said that, the problem are the bad capacitors on crossover, I don't think the speakers are responsibles.

What do you think about?
Someone knows all capacitor values?

 

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RE: Wharfedale Mach 9 I need capacitor values, posted on July 31, 2022 at 14:01:59
Coner
Audiophile

Posts: 3439
Location: S.W. Washington state, USA
Joined: November 17, 2001
Kind of rare, but the flex leads on woofers sometimes fray, causing intermittent crackles, or distortion. You can put bass signal directly on woofer to test it. I'd re-do the solder joints also. Do replace the caps, of course.

Isn't the values stamped on the cases?. If faced down, cut one lead and bend it up.

That one brown resistor on the upper left board looks cooked, might be 1 watt?. If that's a circuit breaker I see with the red wire's, I'd bypass it.
That's a really weird x-over setup I'd say.

 

what Coner said and , posted on July 31, 2022 at 15:03:38
Story
Audiophile

Posts: 7049
Location: NJ
Joined: December 11, 2000
clean up those Lpads, they probably have oxidation inside so get an appropriate contact cleaner, shoot some in there rotating the controls so it drains out into a kleenex, and spray a little deoxit inside after. See what kind of junk is in there.

Those look like Alcap electrolytics, get rid of them, they are most likely the cause of zing, zing, crunch sounds. The push on connectors to the board should be checked also

This may be a tough one, many things may need replacement but it's worth it to try anyway if you think so



 

RE: Wharfedale Mach 9 I need capacitor values, posted on July 31, 2022 at 15:27:39
dark25.mc@gmail.com
Audiophile

Posts: 5
Joined: July 31, 2022
Sorry for cooked resistor, I know.
Pictures are taken from internet.

 

RE: what Coner said and , posted on July 31, 2022 at 15:33:38
dark25.mc@gmail.com
Audiophile

Posts: 5
Joined: July 31, 2022
Lpads were bypassed.
I bypassed breaker circuit and led one too, changing ubar position.
After my listening tests, I think problem is on the circuits.

 

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