@jazzmammal - I was typing while you wrote your response. See the list of what else you have to buy to make that combo work with your existing mains.

@Mac - sorry to disagree so blatantly, but this is coming from a guy who loves bazookas for vehicle use - bought one from Crutchfield in the late 80's and loved the boom it gave my Dodge Omni. Unless you are a hobbyist with a spare AC-DC power supply, the right crossover setup, etc - IMO it's just not an even close to ideal solution for either Ryszard nor jazzmammal's very different purposes.