Hi
I have a schematic that I am following to build a pair of crossovers for some JBL pro drivers. I have an 8 Ohm bottom and HF and a 16 ohm mid. These are all correct based on the crossover and the speaker model.
I am having a hard time findig resistors to match the resistance and watt rating.
For instance, I need a 50 Ohm 11W but all I can seem to find is 47 Ohm 10W
Can anyone advise how critical small differences would be. Would my ears hear any difference ?
I have a schematic that I am following to build a pair of crossovers for some JBL pro drivers. I have an 8 Ohm bottom and HF and a 16 ohm mid. These are all correct based on the crossover and the speaker model.
I am having a hard time findig resistors to match the resistance and watt rating.
For instance, I need a 50 Ohm 11W but all I can seem to find is 47 Ohm 10W
Can anyone advise how critical small differences would be. Would my ears hear any difference ?
At a glance: Two 100r (standard value) at 10W, parallel. The resulting 19W-20W rating will just run a bit cooler than the bizarre 11W spec.
People who manufacture products use lots of parts, so they can order EXACTLY what they want. SO you get 11 watt resistors and such. Of course those are not available in the parts market, so you use 15 or 20 watt or whatever you find as standard values.
47 ohms is within 10% of 50 ohms, and ought to be OK, but as PRR says, two 100 ohms in parallel makes exactly 50, unless the 100s are off value.
47 ohms is within 10% of 50 ohms, and ought to be OK, but as PRR says, two 100 ohms in parallel makes exactly 50, unless the 100s are off value.
And the 11 watts is required when you take the JBL all the way. If you do not it opens up for alot more choices
I always use resistor wattages twice maximum power used by circuit.
Resistors run at their rated wattage can get very hot and in exceptional circumstances can melt the solder.
Resistors run at their rated wattage can get very hot and in exceptional circumstances can melt the solder.
Instead of blindly copying, have you done the effort to see what you actually need? Doing a crossover, I bet they spec's what was in whatever local source was their supplier.
Not seeing your crossover, a 50 Ohm is a huge resister in a crossover. Not sure I have ever used one larger than 12.
Do th proper simulation with any of the crossover simulations and see what 47 vs 50 does for you. Probably insignificant.
Not seeing your crossover, a 50 Ohm is a huge resister in a crossover. Not sure I have ever used one larger than 12.
Do th proper simulation with any of the crossover simulations and see what 47 vs 50 does for you. Probably insignificant.
OK, yes, the right side connected to the autotransformer does something.
The left side connected to a 50 Ohm and an 80 Ohm does nothing, as drawn here.