15 Mm speaker driver small enough for optimum wearing comfort and big enough to deliver crisp, non-distorted sound, the 15 mm speaker driver is an ideal size for listening enjoyment. Bass beat vents bass beat vents allow air movement for better sound wi 15 Mm speaker driver small enough for optimum wearing comfort and big enough to deliver crisp, non-distorted sound, the 15 mm speaker driver is an ideal size for listening enjoyment. Bass beat vents bass beat vents allow air movement for better sound wi Brand Philips SKU PH804EL0A4U9CNAFAMZ-26587 Model SHE3000BK/10