Trace back the driver's impedance from the crossover schematic.

[presscot]

I'd like to know the impedances of these drivers: HT, MT, and TT.

Can we trace back the impedances of the drivers from the crossover schematic?

Thanks for the help.

 

[AllenB]

Do you want to know 8 or 4 ohms or do you want impedance plots?

 

[presscot]

Do you want to know 8 or 4 ohms or do you want impedance plots?

8 or 4 Ohms.

The brochure for these speakers suggests they are 8 Ohms total. But, in my view, they should be 4 Ohms.

So, I ask here for other opinions and also values on each driver.

 

[markbakk]

They likely are 6 Ohm 😉. But where did you find this old German scheme?

 

[presscot]

But where did you find this old German scheme?

www.radiomuseum.org

 

[presscot]

Any ideas?

 

[AllenB]

Do you simulate? Toss in the values with generic 8 ohm drivers and plot them, then add 8 ohm resistors to bring the load to 4 ohms, and see if one looks less likely than the other.

 

[presscot]

Do you simulate? Toss in the values with generic 8 ohm drivers and plot them, then add 8 ohm resistors to bring the load to 4 ohms, and see if one looks less likely than the other.

Good idea.

Thanks very much.

 

[markbakk]

A (preferably true RMS) multimeter, a signal generator, a resistor, a switch and a variable resistor allow you to build a ‘Wien bridge’. That way you can measure your own impedance at various frequencies. I used to do this in the pre-pc era.

Otherwise, just get a dual channel audio interface, some resistors and LIMP (ARTA) to measure yourself with your pc. It’s not really hard to learn. Just my 2 ct.

 

[Audio>X]

The crossover circuit above is for an 8 ohm woofer, a 16 ohm midrange and 8 ohm tweeter.
The crossover frequencies are roughly 700Hz and 5Khz.