Zobel network

Merlin uses a Zobel.

Dynauadio and Thiel have so many parts in their crossovers, despite a great deal of them being first order, that I would guess there is a Zobel in there.

Whether or not you actually need one is more the question. There are two schools of thought. Yes, you present a more flat impedance, and many feel the woofer or midrange "work" better. Others, including myself, go along with the no free lunch philosophy, seeing this manifested in additional crossover parts robbing dynamics and/or immediacy.

Whose side is right? Both, and neither. You can build a good speaker either way. Certainly, I hold the Merlins that Bobby builds in the highest esteem sonically. Our three way Frieds use a grand total of four parts in the crossovers, with no Zobel. Zobels are a lot more popular with those who implement series crossovers, such as in our Frieds, but we don't go with them. You may want to experiment, trying the circuit with and without it. My only caution is to make sure both the speaker and the coil and the resistor are all broken in to give you the most accurate snapshot as to whether or not the Zobel is your cup of tea.

Alfredo, are there gross anomalies in yr woof's impedance curve around the chosen x-over point that necessitate a zobel?? If not, live with the woof's inductance pattern. If yes, you're stuck with it! If you're adventurous, try the zobel both in front and behind the xover & choose the setting you prefer...

My Seas Odin speakers (rears) have a network across the two W18E001 magnesium cone woofers. Its purpose is to tame a well defined peak in the response of these drivers, just before they roll off. Away from this peak, the response is very flat, and the peak and the associated network to tame it is the penalty. Nothing comes for free! These drivers would have to be crossed over much lower if they were used without the network.

I am not a techie,but a real good amp designer in So Cal said a few months back,he does not like what they do in amps with regards to the sound coming out of the speakers.Just an opinion of course...Bob

Thanks for the responses. Gregm, judging the speakers T/S parameters, the impedence is up to 28 ohms at the crossover point with is 2500hz. At the point where the the impedence start to rise is at about 350 hz. At 1k, it has risen to 16.30 ohms.

So far I have the resistors but I'm still need the capacitors but don't with one to go. Electrolytic or poly caps?

Thanks
Alfredo