JBL 6021
The JBL 6021 is a 2.1 computer speaker system. Some documentation also calls it the "duet." The record on this model is thin. No production years, original price, or official JBL spec sheet have surfaced, so what is known comes largely from owner and technician reports rather than manufacturer documentation or period reviews. One period trade publication noted JBL's focus on its SR4700 series professional loudspeakers during the late 1980s and early 1990s, rather than consumer multimedia products like the 6021 (EQ-Magazine, November 1990, p.52). JBL's SR4700 Series was listed among new products at the AES convention in that same issue (EQ-Magazine, November 1990, p.52).
What the record does show: the system consists of two satellite speakers with full-range drivers (rated at 2 × 7 W RMS) and a sealed subwoofer with a single 5.25-inch driver (16 W RMS), with a combined frequency response of 30 Hz–20 kHz. The subwoofer measures roughly 8×8×8 inches and weighs about 7 lb. Inputs include a 3.5 mm AUX jack and a headphone jack on the right satellite, which also carries the volume control. Internally, the amplifier and audio DSP communicate over an I2C bus, and the volume control is an I2C-controlled digital potentiometer — an unusual and somewhat forward-looking design for a consumer computer speaker of its era.
Owners consistently describe the 6021 as sounding excellent. One forum user called it "a really great sounding 2.1 system." The same sources agree on a well-known weakness: the I2C volume potentiometer on the right satellite tends to fail, and when it does the left channel cuts out. The hifi-forum.de thread names this as a common failure point and says the replacement part can be hard to source. One technician reports the repair is straightforward if a matching I2C pot can be found. The MikroTik forum thread documents the same failure and a partial disassembly to inspect the DSP/amp board.
That is essentially the whole documented story. No magazine reviews of the 6021 have been located. The period press coverage of JBL in the relevant era focused on the SR4700 series and other professional lines, not this consumer multimedia product. If yours has the channel-cutout issue, the potentiometer is the first thing to suspect.
Known specs:
- Satellites: 2 × full-range drivers, 2 × 7 W RMS
- Subwoofer: 5.25 in driver, 16 W RMS, sealed enclosure
- Frequency response: 30 Hz – 20 kHz
- Inputs: AUX (3.5 mm), headphone jack; 3.5 mm-to-RCA adapter block for speaker input
- Outputs: Headphone (3.5 mm)
- Controls: Volume on right satellite (I2C digital potentiometer)
- Subwoofer dimensions: approx. 8 × 8 × 8 in; approx. 7 lb
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