Marchand

Note that

1) Many cross-overs incorporate compensations for baffle step, rising response with increasing frequency, and driver resonances.

2) Many cross-overs combine drivers' acoustic roll-offs with electrical transfer functions to produce the final slopes.

3) Many cross-overs get the flattest response by compensating for the phase shift cause by their acoustic center location or band-pass functions with asymmetric cross-over slopes and points.

much of which the marchand products won't accomodate.

Without measuring the transfer functions from your existing passive cross-overs you don't know enough about what's going on to do as well with an active solution.

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.

I wrote:
>much of which the marchand products won't accomodate.

which was incorrect.

You can have shelving filters, peaking filters, notch filters, etc. but some one needs to know what you need and calculate component values. Most of that is listed in the manual.

Each channel of each way has 3 card-slots. Each card-slot connects to the pins of a dual op-amp.