Two Amplifiers Connected in Parallel?

You are going to get a variety of answers on this; what you are describing is horizontal bi amping. I have always liked vertical bi amping where each amp drives both sections of each speaker but others like it your way. Besides the extra power it is generally thought that bi amping provided better definition and increases transparency. It also increases complexity and can sound worse if not done carefully. I am not familiar with your gear, make sure that all outputs are controlled by the volume control, otherwise one will get full output at all times. If you have only a single output you can use a Y plug or other adapters, I have had ones custom made by cable companies in the past.

"Besides the extra power it is generally thought that bi amping provided better definition and increases transparency."

I would add this is far from a universal opinion.

Kal

if you search the archives on "biamping" (may want to try various spellings (eg "bi-amping"), you will find a wealth of discussion to answer any questions you have.

I agree with the responses above. I have tried vertical and horizontal biamping with mixed results. Results in my experience are highly dependent on the equipment you're using and the speakers you're driving, and can range from awful to very good.

If you do not use an electronic crossover, this approach has limited usefulness. It works better with transistors than it does with tubes though, as most speaker crossovers are high impedance when they are blocking the unwanted frequencies. This causes a transistor amp to make less power. It may not reduce the power of a tube amp all that much.

If you use an electronic crossover, the introduction of the crossover itself will have an audible artifact. How much has to do with the design, but no crossover will be completely transparent or neutral. In addition, most speakers have nuances of driver behavior which most electronic crossovers don't take into account.

So it can be tricky! My advice is to try it but be careful- the top amplifier outputs cannot in any way have connections to the bottom amplifier (for example- through the speaker's passive crossover), else you could damage something.

I tried it last year .My set up was Aerial acoustics 10T with Rogue Zeus 200W driving bass on both channels and Rogue M150's 150W monoblocks on mids/highs with Rogue Magnum 99 pre dual outputs.I REMOVED the bridging straps at the back of the Aerials.I used this set-up for about 2 months and then tried then Mark Levinson 27.5 connected on the same speakers and I prefer the sound this way better.I am planking in the future to get an active crossover like the Bryston 10B and try it as Atmasphere describes.I was told that the Aerials have a well designed crossover specific to the design so I am sceptical if an external crossover will achieve better results.Your milage may vary,but try and see for yourself.
Best
George