I tried it on the non-HK HiFi system in my car and couldn't notice a difference with the presets (movie theatre, concert etc). With the equalizer, I noticed a difference only when I changed the two on the ends (bass and treble settings) and none in the middle (100Hz, 200, 500 etc). I tested it on SiriusXM.
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Current:
2020 BMW 330i xDrive
2018 Audi SQ5 Prestige
2017 Audi A7 Prestige
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