National RX-XE550
This boombox is similar to the RX-XE520. The speakers look the same, but the 550 has a digital tuner, a 10-band graphic equalizer, and a 7-band spectrum analyzer, while the 520 has an analog tuner, a 7-band graphic equalizer, and a 5-band spectrum analyzer. Also, the 550 has only one tape deck, while the 520 has two.