Marchand

The other thing to note here is that #3 is a compromise for the inability to implement affordable speaker level delay networks.

People monkey with asymmetries until they get acceptable response over a given vertical window.

Ideally, you'd use symmetric slopes and delay the driver with phase lead using all-pass networks.

Obviously, this requires measurement capabilities.

If the goal is to realize the gains of multi-amplification and not to embark on speaker design as a hobby, you'd be better off buying active speakers which suit your tastes or building a respected active design that's known to work well.

Drew - thanks for your very informative responses. At the risk of hijacking Stanwal's thread, let me ask a related question: If one wants to remove the low bass from the main speakers (which in my case has the woofer crossed over at 80Hz) and send it instead to a pair of subwoofers, then would an active or passive Marchand unit be fine? My thinking is that all of the factors in you first post above wouldn't come into play with the main's woofer as it'll be removed and replaced with the subwoofers. . .

Stanwal,

I would call Marchand if I was you. The owner has forgotten more about crossing over speakers than the collective brain trust here has ever known.

If he has made a crossover for your speakers before, he has a set of parameters worked up already. I think you will be surprised how simple it can be for Marchand to build something for you. Also, there can be several different modules they can suggest, very reasonably priced, to make adjustments.

I am now really confused. The reason why I don't buy or build active speakers of another brand [I have had some] is that I like the sound of the Spendors better and wanted to optimize it. They did make an active version but the company has changed ownership since that time. I will try to contact them as well as Marchand.

Excellent idea! I love those speakers too.