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What are the speakers from the music center capable of and can they be improved, using the example of the Sony SS-H711. As an alternative to the Vega 15AC-109, 25AC-101? 2:09 Sony 771 speakers - original: opening and measurements 5:55 Fighting resonances: screed, vibration isolation 20:25 Resonance summary 21:21 New crossover 1 28:02 Filler test 33:32 Filler summary 35:00 Deceived by modifications 36:58 New crossover 2 41:54 Listening 56:11 Result