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Hi! Thank you for reaching out! We understand you're looking to adjust the treble on your HT-A9000. The HT-A9000 does not have a dedicated, user-adjustable treble control. The system is designed to automatically optimize the sound field based on its environment and the content being played. While there isn't a direct treble knob, you might find that exploring the different sound modes or optimizing the sound field through the "Sound Field Optimization" feature can help fine-tune the audio to your preference. For additional information, please visit the following link: https://helpguide.sony.net/ht/208283c/v1/en/contents/022_Adjusting_Sound_Quality.html Thanks for considering Sony products! Best regards, Estefany
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