Brand positioning, product series, technical level, market reputation.

1. Brand positioning. The brand positioning of Music Fax is relatively high-end. It mainly produces and sells high-end audio equipment, and pays attention to details in appearance and performance, striving to achieve perfection. Yajun, on the other hand, is relatively low-key, with a more mid-range brand positioning, a richer product line, and wider coverage.

2. Product series, Music Fax mainly produces HIFI audio equipment, such as power amplifiers, CD players, decoders, headphone amps, etc. Yajun's product series is relatively comprehensive. In addition to HIFI audio equipment, it also produces and sells home theater equipment, speakers, audio-visual accessories and other types of products.

3. Technical level. Music Fax is a leader in China's audio industry. It has invested heavily in technology and has leading technology and production technology. Although Yajun has made many breakthroughs in technology, it is still relatively inferior to Music Fax.

4. Market reputation. Due to its outstanding performance in the high-end market, Music Fax has been highly praised by many audio enthusiasts and professionals, and has a high reputation and popularity in the market. Yajun, on the other hand, does better in the mid- to low-end market and is loved and recognized by consumers.