Yamaha KX-670 is a sophisticated stereo cassette deck with 3-Head Configuration, Dolby HX Pro Dynamic Bias Servo, and Dolby B/C Noise Reduction. It features Auto Tape Tuning that improves recording quality by adjusting recording characteristics for optimal results with every cassette tape. Fine Adjustment of Recording Bias with Bias Adjust Control allows you to personalize the high-frequency sound. Play Trim Control enhances playback compatibility with other decks.