Brand: Dual
The Dual CS 503 is a stereo cassette deck that was manufactured by Dual, a German audio equipment company. This specific model, serial number -1, was likely a prototype or a pre-production test unit. The CS 503 is known for its high-quality sound reproduction, advanced features such as Dolby B/C noise reduction, and reliable build quality. In terms of its specifications, the CS 503 includes an auto-reverse function, Digital Tan Demagnetizer, and Frequency Response +/- 0.5 dB (20-20,000 Hz). However, without further information, it is unclear what makes this particular model, -1, different or unique.