The well heeled audiophile will of course invest in this
http://parts.wilsonaudio.com/wilson-audio-flat-jack/
But I’ve never found any problem with the tilt on each corner approach, unless you have very spindly spikes there shouldn’t be any issues
i have much more difficulty adjusting the feet under heavy power amps on stands as these cannot be tilted like tall speakers, that’s when I did need to resort to a set of jacks/blocks to lift the, up
http://parts.wilsonaudio.com/wilson-audio-flat-jack/
But I’ve never found any problem with the tilt on each corner approach, unless you have very spindly spikes there shouldn’t be any issues
i have much more difficulty adjusting the feet under heavy power amps on stands as these cannot be tilted like tall speakers, that’s when I did need to resort to a set of jacks/blocks to lift the, up