Bi Wiring Speakers from Luxman L-509X

So one hump is the driver one is the port and on the right that's the XO right? 

Not 2 ports on the left, Driver and port?

Thanks E

Regards

Hey @oldhvymec

A single driver in free space produces a 1 hump curve, where the peak is called the driver's resonant frequency. You’ll see this in any woofer spec sheet:

https://www.madisoundspeakerstore.com/approx-8-woofers/seas-excel-w22nx001-graph-e0077-8-graphene-co...

Put that woofer (all alone) in a sealed cabinet cabinet and the impedance curve will have 1 hump with a new resonance point.

Add a tweeter with the appropriate crossover and you will have 2 impedance humps. The Magico S1 Mk II for instance:

https://www.soundstagehifi.com/index.php/equipment-reviews/973-magico-s1-mk-ii-loudspeakers

Click on the link near the start of the article and scroll down.  That peak just below 50 Hz is the woofer/cabinet system alone.  The peak above 1kHz is the combination of the low and high pass filter sections.

Now, port that woofer in a cabinet and you’ll get 3 peaks total. The single woofer peak will turn into two. 

Best,

E

@oldhvymec

You might find this discussion useful. In it we go over the impedance of a woofer in a sealed cabinet:


https://speakermakersjourney.blogspot.com/2016/12/crossover-basics-zobel_8.html