I'm building my first set of speakers. I have done months of research on drivers, designing crossovers, cabinet considerations, so let's please leave that aside.
I thought I would be clever and buy much cheaper parts than what I was planning on buying with equivalent specs to confirm the theoretical changes I was seeing in VituxCAD. I made three measurements using REW and my UMIK-1:
1) No crossover
2) Proposed first order crossover
3) First order crossover with a 1.5Ohm resistor in the woofer circuit intended to bring down a 100Hz peak.
Please ignore the shifts in SPL, I had the preamp at different levels on different days.
The resulting sweeps are telling me that the crossover I designed does not have an effect below 1k Hz.
This is the basic crossover circuit. As I understand the circuit, below is a description of how I wired it so my procedure can be checked:
The positive leg of the 6.8uF cap (treble), either post of the 270uH inductor (mid), and either post of the 4.7mH inductor meet with the positive wire of the amplifier at the same point.
Treble: The neg leg of the cap, the pos wire to the speaker, and either post of the 100uH inductor come together. The neg wire to the speaker and the other post to the inductor come together.
Mid: The other post of the 270uH inductor, the pos wire to the speaker, and the pos leg of the 10uF cap come together. The neg wire to the speaker and the neg leg of the cap come together.
Bass: The other post of the 4.7mH inductor, the pos wire to the speaker, and the pos leg of the 100uF cap come together. The neg wire to the speaker and the neg leg of the cap come together.
The three combined negative speaker wires and associated components are all bound together with the negative wire to the amplifier.
Can you identify any mistakes in my procedure that would cause the bass and mid circuits to come away unchanged? Subjectively, the sound is different at each of these three points, that is why the measurements under 1kHz all being the same surprised me.
Any help is appreciated.
Thanks
I thought I would be clever and buy much cheaper parts than what I was planning on buying with equivalent specs to confirm the theoretical changes I was seeing in VituxCAD. I made three measurements using REW and my UMIK-1:
1) No crossover
2) Proposed first order crossover
3) First order crossover with a 1.5Ohm resistor in the woofer circuit intended to bring down a 100Hz peak.
Please ignore the shifts in SPL, I had the preamp at different levels on different days.
The resulting sweeps are telling me that the crossover I designed does not have an effect below 1k Hz.
This is the basic crossover circuit. As I understand the circuit, below is a description of how I wired it so my procedure can be checked:
The positive leg of the 6.8uF cap (treble), either post of the 270uH inductor (mid), and either post of the 4.7mH inductor meet with the positive wire of the amplifier at the same point.
Treble: The neg leg of the cap, the pos wire to the speaker, and either post of the 100uH inductor come together. The neg wire to the speaker and the other post to the inductor come together.
Mid: The other post of the 270uH inductor, the pos wire to the speaker, and the pos leg of the 10uF cap come together. The neg wire to the speaker and the neg leg of the cap come together.
Bass: The other post of the 4.7mH inductor, the pos wire to the speaker, and the pos leg of the 100uF cap come together. The neg wire to the speaker and the neg leg of the cap come together.
The three combined negative speaker wires and associated components are all bound together with the negative wire to the amplifier.
Can you identify any mistakes in my procedure that would cause the bass and mid circuits to come away unchanged? Subjectively, the sound is different at each of these three points, that is why the measurements under 1kHz all being the same surprised me.
Any help is appreciated.
Thanks
