Hey all,
I've gotten myself lost in another speaker project so I'm coming to you chaps for help! I'm trying to replace or bypass the volume pots on my Leak 3090s. One of the existing pots completely failed, and I never feel the need to adjust them.
Here's where I'm getting confused. All three drivers in the top cab have a variable L-Pad pot, with an additional 4.7ohm resistor in parallel (I'm not sure what this is for).
On the pots, the LMR and HMR both max out at +2db, and the tweeter goes to 0db. This would indicate to me that at the 0 point on the pot, the L-Pad on the tweeter should measure almost no resistance, and the other two should be making a 2db pad as they are the exact same component. However, upon measuring the pots I got roughly 1.7ohms on the serial, and 30hms on the parallel on all three. By my calculation that's a 2db L-Pad. Perhaps a stop was set on the tweeter pad?
It's possible I'm over complicating this but it would be nice to have some confirmation on my logic. My current plant is to replace the L-Pad pots with 2db fixed L-pads, but I'm still unsure of what to do about the 4.7ohm resistor in parallel as I don't understand it's purpose. I've attached a schematic I received from a kind member on here, and I've highlighted the bit in question. I have already recapped the rest of the crossover and replaced all the wiring with Van Damme Blue.
Many thanks,
Blindmelon7
I've gotten myself lost in another speaker project so I'm coming to you chaps for help! I'm trying to replace or bypass the volume pots on my Leak 3090s. One of the existing pots completely failed, and I never feel the need to adjust them.
Here's where I'm getting confused. All three drivers in the top cab have a variable L-Pad pot, with an additional 4.7ohm resistor in parallel (I'm not sure what this is for).
On the pots, the LMR and HMR both max out at +2db, and the tweeter goes to 0db. This would indicate to me that at the 0 point on the pot, the L-Pad on the tweeter should measure almost no resistance, and the other two should be making a 2db pad as they are the exact same component. However, upon measuring the pots I got roughly 1.7ohms on the serial, and 30hms on the parallel on all three. By my calculation that's a 2db L-Pad. Perhaps a stop was set on the tweeter pad?
It's possible I'm over complicating this but it would be nice to have some confirmation on my logic. My current plant is to replace the L-Pad pots with 2db fixed L-pads, but I'm still unsure of what to do about the 4.7ohm resistor in parallel as I don't understand it's purpose. I've attached a schematic I received from a kind member on here, and I've highlighted the bit in question. I have already recapped the rest of the crossover and replaced all the wiring with Van Damme Blue.
Many thanks,
Blindmelon7
Attachments
Set the pots where you want them, and disconnect the leads. Measure with a DVM that is accurate
for low resistances (not all are), and replace the pots with two fixed resistors per driver, one in series,
and one in shunt. Then the electrical behavior will be the same, and the crossover action will not be altered.
for low resistances (not all are), and replace the pots with two fixed resistors per driver, one in series,
and one in shunt. Then the electrical behavior will be the same, and the crossover action will not be altered.
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