Advice on Modding Soundbar into Custom 2.1 Setup

Hello everyone! I'm new to this, so apologies if my questions are a bit basic.

I'm working on a small project to "re-factor" an old Samsung HW-D570 soundbar into a compact 2.1 audio system. My plan is to move the amplifier section into a standalone box, connect two wired speakers to it, and keep the wireless subwoofer as it is.

According to the specs, the original soundbar uses two speakers described as "2-way, 80 Watt, 4 Ohm, wired". Each speaker actually contains two small woofers and one tweeter. The woofers are labeled "HUSNF-00900, 8 ohms." When I measure the impedance from the wires going to each speaker (which includes both woofers and the tweeter) with a multimeter, I get about 4.5 ohms.

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I have a couple of questions:
  • Is this a 2-way or 2.5-way speaker system? And are the two woofers in each speaker likely wired in series or parallel? I can't see the internal wiring clearly.
  • Main question: Can I replace the current speakers with some spare Monitor Audio Radius 45 speakers I have? These are 8-ohm, compact satellite speakers rated for 15–50W, with a 3" woofer and a rear-firing tweeter. (Or should I rather use 4-ohm speakers? Or only keep the original speakers?)
My main goal isn't necessarily to improve the sound quality, but to change the format and case of the system to better suit my needs.

Thanks in advance for any advice or insights!
 
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