Maximum speaker handling has nothing to do what it sounds like, quality (or lack thereof) or maximum sound pressure levels, according to room, material, and speaker frequnecy response, plus if the amplifer is capable of it.
You also have the amplifier, many 25W amplifiers will outperform the Logitech amplifier modules (65W) I would estimate a true output from the Logitech would be 6W, perhaps 10W at the most. If you connect up 4ohm speakers and/or low sensitivity speakers the amplifier will probably cut out too.
My setups around 2.5KW into 4ohm. Not that means anything, but at least it doubles up for 4ohm, and roughly 220W into 2ohm per channel.