With better streamer (pure digi transport, not talking about DAC’s or other functionalities that may be integrated), you may get the following benefits that may (or not) contribute to better sound quality potentially:
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Better optimized software / operating system / firmware for audio playback
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Higher quality inputs / outputs
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Higher quality power supply
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Higher quality isolation from interference sources
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Higher quality clock signal - depends on your connection, but it’s important for example for SPDIF outputs
I have speakers equipped with feet using good quality industrial rubber silent blocks for a fraction of the price. Works better than some of those expensive hi-fi feet that I’ve seen.