Crossover Circuit Question?

What is the purpose of using 200uf and L2? What do these do? What is the effect?
And what was 0,47 ohm used for ? can you help me.


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What is the purpose of using 200uf and L2? What do these do? What is the effect?
And what was 0,47 ohm used for ? can you help me.


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I often find using a tool like XSim to simulate and do what-if analysis can really help. It's a little weird if you don't have values for L1/L2 but you can figure it out. 🙂 This holds true even if you use the default, ideal speakers.
 
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I can't help wondering if the 0.47ohm is supposed to represent the L1 DCR but it seems a remarkably pat (standard) value if so & that doesn't really chime with the placement either.

My assumption would be it's a near-bottomless notch (depending on the L2 DCR) intended to stamp on a breakup peak, although as has been shown above, depending on the values you may get some peaking in the electrical transfer function below the LP corner, & it's possible that could be used to prop up the acoustic response in that region. Depends on the on-baffle FR etc. Seems a bit of a funny way of going about it, but some unusual topologies do occasionally crop up.
 
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Woofer 2x8ohm
Squawker 1x8ohm
Tweeter 1x4ohm

When I examine the circuit in the xsim simulator, there is a dip in the 2-2.5khz band. But when I measure the frequency response, I get a very normal monitor response.
this is the circuit.
IMG-20240811-WA0003.jpg

Since I didn't have 150 and 200uf on hand, I made the bass crossover with 22uf and 1.1mh. When I looked at it in the simulator, I got a response almost close to the original. I used 100uf and 0.33mh instead of 200uf. I don't know how accurate a topology like this is, but the result is quite good.
 
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I wouldn't put a resistor in series with a woofer - it could get rather hot.

Where circuit diagrams show the DCR of an inductor, it's usually shown straight after the inductor and indicated in some way, so in this case I'd expect to see it before the connection to the 'tank'.

0.47 ohms is a very low value, not sure what it would do at that place in the circuit.

However, my knowledge of electronics and circuits is very much second and third hand, so I'm happy to be wrong about this.

Geoff
 
Is it possible that there is an error in this schematic? Maybe it would make more sense if the 0.47R was in series with the 200uF capacitor and L2, or maybe in series with the 150uF capacitor? Do you have any photos of the crossover?
 
When you are looking at XSim, are you using "ideal" drivers or did you measure the FR and impedance for each?

If you are using the ideal, default drivers, XSim can only produce the electrical transfer function. That is, what the crossover does to the electrical impulse. If your drivers have a peak at 2.5 kHz and your electrical transfer function has a matching dip, then we expect flat output.

XSim can only show the combined outputs with the full driver measurements.