หน่วยเดซิเดล, ฐานข้อมูล, เครื่องวัดระดับเสียง, ปริมาณ, เสียง, สตูดิโอ, วัด, ไมโครโฟน, สัญญาณรบกวน
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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