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Multi-Way Conventional loudspeakers with crossovers

Weird noise inside Heco Superior 940
Weird noise inside Heco Superior 940
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Old 9th December 2018, 09:32 PM   #1
Buehgemeiste is offline Buehgemeiste
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Default Weird noise inside Heco Superior 940

Today i purchased a pair of good old Heco Superior 940
I listened to them before the purchase and they sounded great
Whlie driving them home in my car i heard a weird noise coming from the loudspeakers.
It sounded like something dropped inside one of the boxes.
When i carried them from the car inside the house the exact same noise repeated in both cabinets.
It was like a rattle and i imagine something dropped inside the boxes.
Now i'm uncertain what the reason for those noises were and what to do.
Is it possible that the x-o loosend and dropped?
What else could have dropped?
Where should the x-o be located in those cabinets?
Should i simply connect an amp and try the speakers?
Should i remove one woofer (which) and take a look inside?
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Old 9th December 2018, 09:43 PM   #2
charlie2 is offline charlie2  England
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Do not connect them up until rattle is resolved

Take out a driver and look in side n feel if nothing obvious shake and bang the cabinets with palm of hand
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Old 9th December 2018, 10:57 PM   #3
Buehgemeiste is offline Buehgemeiste
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ok.
i guess i should remove the lower of the two woofers.
does anybody own a plan, that shows the inside layout of the cabinets.
did anybody here ever open those speakers?
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Old Yesterday, 12:01 AM   #4
Galu is offline Galu  Scotland
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The two woofers are isolated from each other in separate chambers.

Be prepared to remove both woofers and probably the midrange and tweeter as well.
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Old Yesterday, 01:38 AM   #5
avtech23 is offline avtech23  Australia
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Weird noise inside Heco Superior 940
I recently caught my little boy feeding wooden toys into the port of my subwoofer. You'd be surprised at what you might find inside

Shouldn't be too hard to pop the drivers out and fish out whatever might be loose.
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Old Yesterday, 02:40 AM   #6
phivates is offline phivates  United States
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The inductor for the lf driver pulled loose from the crossover board it was hot-glued to. Happens a lot on cheap stuff that endures rough handling unforeseen by the hurried assemblers not permitted to add a ty-wrap, say. You can fix it.

Looks like these were not so cheap. Still, rough handling can cause glued bits to separate.

Last edited by phivates; Yesterday at 02:51 AM. Reason: googled heco 940
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Old Yesterday, 02:54 AM   #7
tsmith1315 is online now tsmith1315  United States
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The Heco products (80's -90's) I have seen or dealt with have been very good quality and not very cheap.
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Old Yesterday, 05:55 AM   #8
Buehgemeiste is offline Buehgemeiste
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Quote:
Originally Posted by tsmith1315 View Post
The Heco products (80's -90's) I have seen or dealt with have been very good quality and not very cheap.
That's why i don't want to touch anything if not necessary.

Quote:
Originally Posted by Galu View Post
The two woofers are isolated from each other in separate chambers.

Be prepared to remove both woofers and probably the midrange and tweeter as well.
That's the kind of info i was hoping for.
Any idea where the crossover is sitting?

Quote:
Originally Posted by avtech23 View Post
I recently caught my little boy feeding wooden toys into the port of my subwoofer. You'd be surprised at what you might find inside

Shouldn't be too hard to pop the drivers out and fish out whatever might be loose.
Luckily those are closed boxes.
I donīt think it will be hard.
But to me loudspeakers like mine might very well be exhibited in a museum.
I don't want to touch the ribbings or anything else, because replacement parts are hard to get.
I don't even like the screws to look used...
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Old Yesterday, 12:40 PM   #9
Kay Pirinha is offline Kay Pirinha  Germany
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Are there any chances to remove the back plane for to give you complete insight over the innards?
Best regards!
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Old Yesterday, 03:20 PM   #10
Buehgemeiste is offline Buehgemeiste
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Quote:
Originally Posted by Kay Pirinha View Post
Are there any chances to remove the back plane for to give you complete insight over the innards?
Best regards!
No chance.

I removed the big woofers.
In both chambers i found big round magnets.
It seems those magnets were originally glued to the back of the drivers.

Is there anything wrong with using superglue for the repair?
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