One of my friends has a pair of Amati. The mid in the speakers don't work and it is good. There is a problem with the crossover. The crossover in these speakers is poured in epoxy so it seems impossible to reach parts to change the faulty one. Is there something on the market to dissolve epoxy without destroying crossover parts ? Thanks.
You can try acetone or heat and scrape off layers of epoxy. It will take forever and there is a pretty good chance you damage the crossover parts along the way like dissolving insulation layers of the inductors.
Have you tried contacting the dealer they came from or the regional distributor and ask about repair?
Have you tried contacting the dealer they came from or the regional distributor and ask about repair?
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Repair? It is clearly not repairable. A replacement crossover will likely cost at least 20x the cost of parts.
In a similar situation i had no luck at all with chemicals, even the really deadly ones. Some heat, a chisel and lots of patience is the other option. Takes some effort but certainly doable.
In a similar situation i had no luck at all with chemicals, even the really deadly ones. Some heat, a chisel and lots of patience is the other option. Takes some effort but certainly doable.
moved to multi-way
I've used an adjustable heat gun with a small nozzle and spudger to remove potting on electronic assemblies and have probably done over a hundred in the last 30 years. Start slow until you get a feel for the potting material and the location of the parts underneath. Don't forget to show us pictures of the process and result. The only difficult one I have come across was the on plug coil pack from a car. It used very high temperature epoxy, but it worked in the end.
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I am reusing an old soldering iron with outer heater for that kind of tasks, very similar to THIS. The factory tip removed and i inserted a steel nail of appropriate size. Epoxy crumbles when it heats up and you just have to be careful not to damage the parts. Coils and resistors actually can not be damaged this way but foil caps can so you should be patient and work slowly around them - but it is quite doable. It is very precise way so you don't heat the whole crossover but just around the component you want until you break it loose. Make sure you do this outside or in well ventilated room because of the fumes that crumbling epoxy makes. I'm guessing they aren't good for your health.
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If I was a betting man, I'd put my money on a dry joint on the circuit board as being the culprit for an open-circuit. Or a bad connector.That might be accessable on the metallised side of the board.
Reflowing solder is usually easy enough. You can often see bad soldering with a magnifying glass too.
Reflowing solder is usually easy enough. You can often see bad soldering with a magnifying glass too.
Manufacturers claim the potting reduces microphony but i have little doubt they are just hiding really cheap components in really expensive speakers.
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