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Yes I know parasound offers this feature and I've heard this amp but that's way too much power and not really class A. Also not a high achiever when it comes to midrange and treble although it's ok.

What is your existing amp?

A crossover to match levels? Don't think I understand. As long as gain on both amps is the same, the levels will also be the same. There’s nothing wrong the my current amp btw.

@lukaszwk It may not be as simple as that. Plan B is to get a passive volume control which you place between the amp with the most Voltage gain and the preamp. In this way you can simply turn it down till you get a match.

But here's something to keep in mind. If you don't have an electronic crossover, this means that all frequencies are being fed to both amps. Whether the speaker is reproducing the frequencies is irrelevant; the amp will be (the unused frequencies being blocked by the internal crossover of the speaker). Being blocked isn't the same as saying that there's no effect of those frequencies on the amplifier- in particular the one that is meant to do the highs.

An electronic crossover allows you to set the levels of the amps and usually the crossover frequency as well. Since you can't remove the internal crossover, it would seem to duplicate functions but as I explained, it will help.

Yes I know parasound offers this feature and I've heard this amp but that's way too much power and not really class A. Also not a high achiever when it comes to midrange and treble although it's ok.

Totally FWIW Dept.: you really should not be able to tell what class of operation any amplifier is if its competently built! You won't hear a 'transition' from class A to AB in the case of an AB amplifier. This is so true that there are class D amps out there that challenge any fully class A amp ever made. So don't worry about whether its class A or not. Class A is a means to making the amp more linear when there's no feedback for correction so this makes the biggest difference with zero feedback amplifiers. But even there as long as the amp is designed properly and properly biased, you'll never hear a difference!

What might be a concern is whether the amp is bright and harsh in the mids and highs. That has nothing to do with class A and everything to do with how well the designer understood the rules of human hearing/perception. Again, there are class D amps out there that have no problem in this regard. I've not heard the Parasound but I wouldn't throw it under the bus because its not class A! 

I have a D Sonic m3a 1200s (class D) which I like a lot. It's just a a fancy I want to entertain and try something else but I didn't want to lose the bass and the control of what this amp provides so bi-amping seems like the way to go.

I wouldn't necessarily say I'm throwing parasound under the bus but i am familiar with that amp and not necessarily smitten. Also I am a firm believer in class D especially newer GanFet ones but they are few and far between and currently not many in the used market. Never owned a pure class A so that's why I'd like to see what' the fuss is about.

May not be up to snuff for you, but I used this to control low pass gain in my bi-amped setup. Worked great.

https://www.schiit.com/products/sys