Hi guys my first post here and I'm looking for advice on how to crossover my tweeters. I am running a dsp which will be set to handle the mid driver in a 2 way speaker being powered by a single channel from my amp. I will need to add a capacitor or crossover inline for the tweeter. I have a wiring diagram of the original crossover. Am I best just building all the components on the tweeter side or will an inline cap do? The crossover has a 750ma resettable fuse, 10ohm resistor, 4.7uf cap and then a parallel 0.22mh inductor coil.
Cheers, Gaz.
Cheers, Gaz.
Is this a component set that you've lost the crossover for? That's a lot of stuff to try stick on the back of the tweeter.
If you attach the diagram I might be able to offer a solution.
If you attach the diagram I might be able to offer a solution.
No the speakers don't come with crossovers they are part of a component set usually or supposed to be run actively but I haven't got enough channels on my amp so I was going to set the range on my dsp for the mid driver and run the tweeter off of the same channel but with a crossover in place to remove the lower frequencies. Here's the picture of the crossover that is supplied with the component set
An externally hosted image should be here but it was not working when we last tested it.
If you're going active, you should aim for a capacitance that drops the level at a frequency below your xover point. For example, at least 1 octave lower. I used 33 uf caps to protect my car tweeters, which are 4 ohm.
The capacitor alone will work. Some people prefer the sound of the simpler crossover.
The crossover you posted will offer better protection if you abuse the tweeters. The PTC thermistor will increase in value when too much current flows. The resistor will limit current at all times and also reduce the level somewhat. The inductor gives you a higher rolloff rate.
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The crossover you posted will offer better protection if you abuse the tweeters. The PTC thermistor will increase in value when too much current flows. The resistor will limit current at all times and also reduce the level somewhat. The inductor gives you a higher rolloff rate.
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OK, I see now. It's the co-ax speaker from a 3 way system.
The biggest difference is the original crossover is 12 db per octave and a single cap is only 6 db per octave (first order vs second.)
The easy route would be a single, non-polarized cap on the tweeter. If it were me, I would build or buy the 2nd order crossover and run it as originally intended.
The biggest difference is the original crossover is 12 db per octave and a single cap is only 6 db per octave (first order vs second.)
The easy route would be a single, non-polarized cap on the tweeter. If it were me, I would build or buy the 2nd order crossover and run it as originally intended.
Thank you everybody for the help. I think I'm going to build the crossover as I'd rather keep the protection on it and I've also been advised to find a resistor with a 12 db slope which was going to be my next question. I've just looked and the parts are really cheap my only other question is with the resistor wattage value, does this have to match the output wattage of the amp or can it be considerably less as its only driving the tweeter. Thanks again everyone ��������
Resistors don't have a slope.
The most common resistor size that I've see is a 10w, generally a white, rectangular ceramic type. You can likely get by with something smaller but the resistor will heat up and the larger the resistor, the cooler it will run. It doesn't need to be nearly as high in wattage as the amplifier power.
The most common resistor size that I've see is a 10w, generally a white, rectangular ceramic type. You can likely get by with something smaller but the resistor will heat up and the larger the resistor, the cooler it will run. It doesn't need to be nearly as high in wattage as the amplifier power.
The resistor is before the crossover and will have no influence on the slope. It will only affect the level.
