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Then connect the + wire to C2, C2 to resistor, resistor to neg. and check that everything is according to schematics the difference in capacitance is within the 20% limit so thats OK
Location: Mexico city
Great! Thank you Soren.
And you bought bipolar caps - right ?
Martin
Well here it is. Bipolar caps, yes. Hours trying to figure out the wiring of this thing, yes. A mess of wires that is strangely organized, yes. Do all of the components work flawlessly, yes. It is also now wired per the schematics. Only a couple of the caps are film, had to pick them to meet the specs. The speakers sound great. Unfortunately the only thing I have to compare them to is a pair of AR-4x's. Thanks for everyone's help through all of this! hopefully it helps someone else out there.
A few pictures of the process and install, and the schematic I had to draw to make sense of it all.
Excellent work, congratulations. I take it that you glued the caps to the board, right?
So how do they compare to the AR speakers ?
The S75's compared to the AR-4x's.
I'm not sure it's the fairest of comparisons given its a 4-way vs 2-way. But with the extra high end and larger low end, they sound much more clear. I rebuilt the crossovers in the AR-4X's and thought that they sounded great, and they do by themselves. But the Beovox's are crushing them right now. I'm sure if I had a pair of AR-3a's it would be a better fight. I have zero experience with top end speakers nor the lingo that accompanies describing sound so with that, I say the highs are high, the lows are decent but could be tighter, and the mid range is, well, mid range. There seems to be a few sounds/instruments that are present with the 75's that are muted with the AR's as well. Brings me back to summer days with my dad blasting Van Morrison while my mom was out of the house. Some day I'm sure i'll upgrade further and be even more amazed.
On the schematic, the (+in) appears to go through the 2.2 cap first, then the 3.3 resistor. But on my crossover, the (+in) connects first to the resistor, which then connects to the 2.2 cap. Seems backwards and also seems like it could contribute to the resistors overheating, cracking, and burning up.
Sorry, but this doesn't make sense.
It's just a load for the amplifier for higher frequencies. The higher the frequencies, the lower the total impedance of this network (R+C) becomes.
It compensates/corrects the behaviour of the filter for frequencies higher than around the 5-6Khz.
Location: Utrecht
I know this is an old thread but it is such a common problem. Attached is a pic of my burned resistors.
Is there a substitute that will not overheat and catch fire?
Is this the original schematic and parts list or has it been modified?
Also, does it look like the top has blow off this cap?
This speaker was heavily overloaded.
There are no modifications or "corrections" that will fix misuse.
Those capacitors are long gone.
The resistors may be fine still - check them.
Capacitor kits and resistors are in the
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