- 240W output @ 4 ohms (150W output @ 8 ohms), solid-state chassis, bass head-unit, single channel, front black and gray control panel, two inputs, seven knobs (v, b, l/m, midrang, h/m, t, tonal balance), enhance switch, power switch, rear panel: two speaker outputs, headphone jack, power amp input jack, effects loop, balanced direct pre-EQ XLR jack, post EQ line out, black casing, 17 in. wide, 4 in. tall, 9.5 in. deep, 16 lbs., mfg. circa 1981-88.

- similar to the BH-220 Head, except in combo configuration with 1-15 in. speaker in a telescoping cabinet, black covering, black grille, mfg. circa 1981-88.

- 250W output @ 4 ohms (180W output @ 8 ohms), solid-state chassis, bass head-unit, two channels, limiter, front black and gray control panel, two inputs, 10 knobs (g, Ch. A: b, m, t, v, Ch. B: edge, b, m, t, v), Ch. A/Ch. B effects loop switch, channel selector switch, footswitch for channel selection, power switch, rear panel: two speaker outputs, headphone jack, power amp input jack, effects loop, balanced direct pre-EQ XLR jack, post EQ line out, black casing, mfg. circa 1981-84.

- 260W output @ 4 ohms (150W output @ 8 ohms), solid-state chassis, bass head-unit, single channel, front black and gray control panel, two inputs, 10 knobs (v, b, six-band semi-parametric bass EQ, t, tonal balance), enhance switch, power switch, footswitch jack, rear panel: two speaker outputs, headphone jack, power amp input jack, lo freq. and high freq. bi-amp outputs, effects loop, balanced direct pre-EQ XLR jack, post EQ line out, black casing, 17 in. wide, 4 in. tall, 9.5 in. deep, mfg. circa 1981-84.

- 400W output @ 4 ohms (200W output @ 8 ohms), solid-state chassis, bass head-unit, single channel, limited, compressor, front black and gray control panel, two inputs, 15 knobs (g, limiter, b, eight semi-parametric EQ knobs, t, tonal balance, v, crossover), enhance switch, power switch, rear panel: two speaker outputs, headphone jack, power amp input jack, low freq. and high freq. bi-amp output jacks, effects loop, balanced direct pre-EQ XLR jack, post EQ line out, black casing, 17 in. wide, 4 in. tall, 9.5 in. deep, mfg. circa 1981-88.

- pre-amp only, solid-state chassis, bass head-unit, single channel, limited, compressor, front black and gray control panel, two inputs, 15 knobs (g, limiter, b, eight semi-parametric EQ knobs, t, tonal balance, v, crossover), enhance switch, power switch, rear panel: low freq. and high freq. bi-amp output jacks, effects loop, balanced direct pre-EQ XLR jack, post EQ line out, black casing, 17 in. wide, 2 in. tall, 9.5 in. deep, mfg. circa 1981-88.