Are different stereo amp models in same system ok?


I currently have one Sim Audio Moon W5 stereo amp, driving some speakers that have bi-wire posts. I am thinking about upgrading my amp. Seems easier to buy a 2nd stereo amp, than to sell my amp and buy a pr of monos. I am thinking using one amp for the bass woofers in both speakers, and another amp to drive the mids and highs in both speakers. Must I use the same amp model for a 2nd amp?
pnxk
You needn't use the same model. In fact, many people use ss for the bass, tube for the mids and highs. I've been doing that for years to great effect. SS amp has 3 times the output, but it has volume pots, which get turned back to about 40%.