Unlike other models in the Tannoy Prestige line, the GRF-90 is rear ported. Dialing in just the right amount of bass will require some experimentation to find the proper distance from the rear wall (and corners) to the back of the speaker.
I’ve owned Tannoy dual concentric drivers (10” and 15”) but not the 12” found in the GRF-90. I’ve never found them to be harsh. You might want to consider an all-copper speaker cable to tone down some of the brightness you are experiencing.
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