Sharp GX-300

The GX-300 (also called the GX-3 in Japan) was a large 3-piece boombox from 1982. I believe it was their top of the line model for that year. It measures 682/250/206 (L/H/D). It weighs 11 KG without the 10 D-cell batteries. It has a powerful "STK" amplifier (STK430 III). Those amps were often used in car stereos at the time. Sharp says its output on AC power is 2x15W Sinus (RMS) at 0.8% total harmonic distortion. And 2x25W "music power".

The tape deck features both Dolby B and C, which is very uncommon for a boombox. It also accepts metal tapes.

Sharp claims the speakers can produce frequencies of 50 to 22,000 Hz. The pressed-wood cabinets contain 16cm woofers, 5cm tweeters, and 2nd Order crossover networks (which are very good at ensuring that the woofers only receive low frequencies and the tweeters only receive high frequencies). Beware, the woofers on this model have foam edges which might need to be replaced.

There were three versions, depending on the country where it was sold: GX-300E, GX-300H, and GX-300Z. There is also the Japanese version, which was available in 3 colors: Silver (GX-3), gray (GX-3G), or red (GX-3R).