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Well the UL6 are great but lack some bottom end, which the Rogers provide (although I find them a bit lacking in detail compared to the UL6) .
My HK is built for 2 sets of speakers (has a second speaker set output) and is a hefty dual mono so should be able to handle it, I'm not whacking the volume up.
If a new amp could extract a bit more bass from the UL6 then I'd maybe drop the Rogers, but it's not as if the HK was underpowered
at the same time? bear in mind, that will halve the impedance seen by the amp, making current overload more likely.
Either pair by themselves should be fine!