I’ve expanded my speaker research and staying with the proviso that the speaker must fit within the internal cube of a Kallax unit, plus the combined cost of the Wiim Amp Ultra and speakers must be no more than £1000.
Keeping with the DALI speakers, I have been looking at the Sonik 1 and the Oberon 1 speakers. Again not looking at a rectangular black box, both these speakers are available in other finishes, the Natural Oak would compliment my planned furniture, albeit, a rectangular box.
The Sonik 1 is now my chosen speaker, based on size, sensitivity (86dB) and frequency range (51-26000Hz). Being a bit easier to drive and better range than the Kupid (83dB and 65-25000Hz).
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So, size wise, spec wise and price wise the Sonik 1 looks quite promising.