anyone bi amp a pair of ess amt1d active xo ?

The slope may be to steep. I'm not familiar with the Rane other than i have seen a picture. I would say your ESS would have a slope at 12db/octave and the slope would finish around 800hz not begin at 800hz
The woofer would also phase out completely around 800hz at 12db. You may need to start your slopes around 650-700hz for a smoother transition at 12db

That's funny - I am doing a biamp on my AMT 1Cs with that same crossover - Rane AC22. My amps are a Pioneer for the tweeters, and a Crown for the woofers.

Like you, I am also using a modern receiver for the pre-pro. In my case, a Denon 3808CI. What I did, with great results, was to the bias the crossover in favor of the woofers slightly to make sure the bass isn't lost, and then run Audyssey, which does a fantastic job of correcting the frequency response irregularities of the drivers, which the original crossovers took care of.

In your case, that's tough because you are trying to side by side them, which I can understand. But I found the results excellent. I am also using Audyssey XT, like your Integra.

Let me know what you think!

IBJamon

Oh, I used 800Hz for the crossover point.

IBJamon

Wow - thanks!!!
We are basicly doing the same deal!
I dont quite get the audyssey integration - can you give me some detail, this will be my next activity!

As you probably already know, Audyssey does a fantastic job of correcting speaker response in the room. In a way, it acts like an equalizer, except without many of the downsides of an EQ. It also corrects time delays, and other things.

Well, when you calibrate your system with Audyssey, it's meant for room modes, assuming your speakers are already close to flat. Well... if you speakers aren't flat, Audyssey still fixes it, within the limits of what it can correct. Try to get it as close as you can, while biasing it a little to the lower end (that's just my experience; yours may be different). Then run the full microphone calibration like you normally would. I think you'll be happy with the results. I know I am. :)

IBJamon