It's simple to passively biamp with different brands. At least, it's simple after the mistakes. On the highest gain amp, add an attenuator (up to 5 KOhm will usually suffice). The pots I tried tended to sound bloated at the crossover point and always needed adjustments. Every CD and the volume made a change. Since I changed over to an attenuator, I had to adjust from what I thought it should be and it just stayed since. Probably something about capacitance. A properly selected resistor might work but I doubt it.
You can combine the best qualities of different amp designs but you have to consider matching characters. You also have to consider the crossover point. If it's above 200 Hz, you're getting into voices and you will hear the difference in amps.
You can combine the best qualities of different amp designs but you have to consider matching characters. You also have to consider the crossover point. If it's above 200 Hz, you're getting into voices and you will hear the difference in amps.