Hi, I'm new to this forum. I'm an engineering student who loves good sound. Unfortunately finding technical information is like pulling teeth. I'm experimenting with my car audio in some unconventional ways.
Question: If I connect resistor(s) in series with a speaker, will it filter certain frequencies? If so, how many ohms are needed filter low end (60-300Hz), how many for mid range (300-3KHz), and how many for high end (3-20KHz)?
I know that frequencies can be further split up into bands. I know the answer might not be as simple as I'd like it to be. let me know if the questions is ridiculous. Just trying to learn.
thanks
Question: If I connect resistor(s) in series with a speaker, will it filter certain frequencies? If so, how many ohms are needed filter low end (60-300Hz), how many for mid range (300-3KHz), and how many for high end (3-20KHz)?
I know that frequencies can be further split up into bands. I know the answer might not be as simple as I'd like it to be. let me know if the questions is ridiculous. Just trying to learn.
thanks
A resistor will reduce the overall power to the speaker. Use a capacitor to reduce low frequencies. (F=1/2pii R C) and an inductor to reduce higher frequencies
A resistor can't filter frequencies as it has no frequency dependent properties. Its impedance is constant vs. F. Inductors and capacitors, on the other hand, are frequency dependent with F and 1/F related impedances, respectively.
Go to your engineering library and pull out a book on network theory. Loudspeakers are a classic case of the application of analog passive filtering.
Go to your engineering library and pull out a book on network theory. Loudspeakers are a classic case of the application of analog passive filtering.
Now a more valid question
oh right, I'm looking at frequency, not current. Just so I can get any idea of where to start, about how much inductance is needed to filter out 3KHz and up? Also, can I filter bass by putting an inductor in parallel with with the speaker, or should I use a capacitor in series?
oh right, I'm looking at frequency, not current. Just so I can get any idea of where to start, about how much inductance is needed to filter out 3KHz and up? Also, can I filter bass by putting an inductor in parallel with with the speaker, or should I use a capacitor in series?
Hi the answer is "it depends" The value of inductor is influenced by the resistance of the load (ie the speakers impedance) also the response curve of the speaker itself. You can use an inductor in parallel with the driver but ONLY if you have a capacitor in series first. Otherwise it will act like a short circuit to the amplifier.
I suggest you have a read of this thread http://www.diyaudio.com/forums/mult...designing-crossovers-without-measurement.html it should give you a good grounding in the basic principals of speaker crossovers.
Tony.
I suggest you have a read of this thread http://www.diyaudio.com/forums/mult...designing-crossovers-without-measurement.html it should give you a good grounding in the basic principals of speaker crossovers.
Tony.
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