MTC-447SG
适用于 Control 447C/T & 447LP 的方形格栅
**Changes:**
- "网罩" → "格栅": More precise technical term for speaker grille in professional audio contexts
- Maintains formal written Chinese (书面语)
- Preserves model numbers and brand references exactly as-is
- Structure remains concise and appropriate for B2B product nomenclature