The GD87 is a high-performance coaxial loudspeaker with identical performance specifications to the legendary AtlasIED C803A model. This similarity in sound quality ensures that existing C803A systems can be expanded with the new GD87 without noticeable differences in sound or performance.

The high-quality 16-watt GD87 model uses a pole-mounted tweeter that adds strength to the assembly and provides an attractive appearance. This coaxial speaker features a frequency response of 45 Hz - 19 kHz (nominal) and a wide, uniform 105° dispersion pattern (2 kHz octave band). The GD87 combines a full-size 8" (203 mm) diameter low-frequency player and a 3" (76 mm) high-frequency player. The two sections are coupled by a built-in cross net. The woofer is 10 oz. (260 g) ceramic magnet; the tweeter is 2.35 oz. (67 g) ceramic magnet. The unit has an average sensitivity of 96 dB (1 W/1 m).

The speaker is paired with a high-efficiency 8-watt, 70.7-V transformer with a maximum insertion loss of 0.6 dB. This premium transformer is constructed with audio-grade laminations and has a full-range frequency response of +1 dB from 50 Hz to 15 kHz. The main taps are 1, 2, 4 and 8 watts.