Designing x-over when amp output 2.3 Ohm impedance

Cousin Billy · 10th March 2011, 12:44 AM

If I am designing a crossover from scratch, and the output impedance of my amplifier is 2.3 Ohms, where do I take into account this figure.

Do I add 2.3 ohms to all of the drivers at the outset?.

Do I subtract 2.3 ohms from all of the drivers?.

Do I not worry about it?.

thune · 10th March 2011, 01:27 AM

If you are tying these speakers to this specific amplifier, then you could model with 2.3ohm as the first series element in the crossover (amplifier side) with tweeter and woofer circuits teeing of after this resistor. (This is assuming the output impedance is flat across the band.)

To make a high-impedance friendly speaker that isn't tied to a specific source impedance, some designers add parallel RLC notches and zobels to flatten the impedance seen by the amplifier. Most seem ignore trying to flatten the woofer resonance since it would take an expensive inductor.

Cousin Billy · 10th March 2011, 02:32 AM

If you are tying these speakers to this specific amplifier, then you could model with 2.3ohm as the first series element in the crossover (amplifier side) with tweeter and woofer circuits teeing of after this resistor. (This is assuming the output impedance is flat across the band.)

Yes, the impedance is flat across the band.

How do I compensate for a resistor of 2.3 ohms as the first element?. Where does this value have an effect?.

10th March 2011, 12:44 AM	#1
Cousin Billy diyAudio Member Join Date: Nov 2008	Designing x-over when amp output 2.3 Ohm impedance If I am designing a crossover from scratch, and the output impedance of my amplifier is 2.3 Ohms, where do I take into account this figure. Do I add 2.3 ohms to all of the drivers at the outset?. Do I subtract 2.3 ohms from all of the drivers?. Do I not worry about it?.

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10th March 2011, 01:27 AM	#2
thune diyAudio Member Join Date: Sep 2010	If you are tying these speakers to this specific amplifier, then you could model with 2.3ohm as the first series element in the crossover (amplifier side) with tweeter and woofer circuits teeing of after this resistor. (This is assuming the output impedance is flat across the band.) To make a high-impedance friendly speaker that isn't tied to a specific source impedance, some designers add parallel RLC notches and zobels to flatten the impedance seen by the amplifier. Most seem ignore trying to flatten the woofer resonance since it would take an expensive inductor.

10th March 2011, 02:32 AM	#3
Cousin Billy diyAudio Member Join Date: Nov 2008	If you are tying these speakers to this specific amplifier, then you could model with 2.3ohm as the first series element in the crossover (amplifier side) with tweeter and woofer circuits teeing of after this resistor. (This is assuming the output impedance is flat across the band.) Yes, the impedance is flat across the band. How do I compensate for a resistor of 2.3 ohms as the first element?. Where does this value have an effect?.

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