S75, The worst crossover I've found

33 replies

Here is another pick of the same crossover but a different resistor that overheated and melted together two wires. These are all 3w resistors, would 10W help with the overheating? I have worked on a lot of speakers and I have never seen crossovers burn like these. With so many failing in the same manner there has to be a design flaw. I started listing the values off my crossover and they vary from the values listed in this thread. For example, C1 is listed as 50uf and mine is 47uf. R2 is listed as 3.3 and mine is 2.2.

What do the resistor markings 4R7, 2R2, ect. mean?

Here is a better pic of my crossover. It does not appear to have been modified.

I cannot read the designations on the two resistors that have burnt against each other.

This is a very nice pair of speakers with good drivers, nice cabinets and perfect grills. I just cannot bring

myself to part them out.

Check the resistors with an ohmmeter.
They don't look too bad in my opinion and could all be fine.
The dark marks on two of them are most likely from glue, a little damping material gotten caught there or something emitted from the
exploding cap nearby.
The melted insulation on two leads is merely an indication that the nearby resistor ran warm - not a problem.

A 10W resistor will not be any cooler than a 3W.
The amount of energy dissipated will be the same, but a 10W resistor will not burn through at f.e. 5W, like a 3W would.
I would stay with the original specs, because in some cases the resistors double as safety devices ("fuses") for the speaker drivers.

The capacitors will definitely need replacing.

Martin

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