JBL Control Micro (Early 1990s)

At 31 pounds, the powered subwoofer anchors a compact 3-piece system that brought JBL's studio monitor heritage to desktop near-field listening.

Overview

The JBL Control Micro is a 3-piece subwoofer/satellite system that JBL aimed squarely at the recording studio and fixed-installation market. It was designed for on-console placement. It sits between the company's professional Control monitor line and the growing demand for compact desktop speakers in the early 1990s. The sub carries its own 50W amplifier, while the satellites run off an external amp. Mix magazine (February 1991, p.106) noted the Control Micro was designed for on-console placement in recording studios.

The layout is simple. An 8-inch powered subwoofer handles everything below 150Hz, and a pair of small 2-way satellites cover the range above. The satellites are bass-reflex designs, ported to get respectable output from their 4-inch woofers. JBL positioned the whole thing as a reference monitor for studios where console space was tight. Mix magazine (February 1991, p.106) flagged the Control Micro specifically as designed for on-console placement in recording studios.

The Control Micro anticipated the desktop audio boom. JBL was a company whose name meant big studio monitors and cinema systems, and here it built a deliberately small 3-piece rig with a 6-ohm nominal impedance and 88dB sensitivity. It wasn't trying to be the L300. It was meant for the meter bridge when you ran out of room for the big stuff.

Key Features

Powered Acoustic Suspension Subwoofer

The subwoofer is a sealed box with an 8-inch (200mm) polypropylene cone driver. It's a powered, acoustic suspension design. There's no port, just a sealed cabinet and the air spring inside for control. The built-in amplifier is a MOSFET Class AB design rated at 50W continuous RMS, with THD held under 0.03% at rated power. Signal-to-noise is better than 100dB below rated output, which is respectable for a unit with a plate amp.

The sub's frequency response is rated at 45Hz–150Hz (±3dB), and it offers high-level, low-level, and speaker-level inputs with binding posts. That flexibility matters: you can feed it from a preamp, from an amplifier's speaker outputs, or from a dedicated subwoofer output. At 14.5 × 14.5 × 15.5 inches and 31 pounds, it's a substantial box for its role — this isn't a puny desktop cube, it's a real subwoofer that happens to be small.

Fourth-Order Linkwitz-Riley Crossover

The crossover point is 150Hz, and JBL specified a fourth-order Linkwitz-Riley alignment that is electronically balanced. That's a steep 24dB-per-octave slope on both sides of the crossover, which keeps the sub and satellites from overlapping much in the crossover region. The spec sheet describes it as electronically balanced, which suggests active filtering rather than a simple passive network. Linkwitz-Riley alignments are known for flat magnitude response and zero phase shift at the crossover point, and they were a standard choice for studio monitors.

Two-Way Bass-Reflex Satellites

The satellites are compact 2-way designs. Each has a 4-inch (100mm) polypropylene cone woofer and a 0.75-inch (19mm) titanium-laminate dome tweeter. They're ported (bass-reflex), which helps them produce meaningful output from a small cabinet. Each satellite measures just 8.6 × 5.5 × 6.9 inches and weighs 3.5 pounds, light enough to sit on a console bridge without straining the structure.

The satellites are rated at 150Hz–20kHz (±3dB) with 87dB sensitivity at 1W/1m. Nominal impedance is 6 ohms, and JBL recommends 10–100W RMS per channel from the external amplifier driving them. The titanium-laminate dome tweeter is worth noting — titanium domes were something of a JBL signature in this era, offering high stiffness-to-mass ratio for extended high-frequency response.

System Integration

As a complete system, the Control Micro covers 45Hz–20kHz (±3dB) with a system sensitivity of 88dB SPL at 1W/1m. The satellites handle the range above 150Hz, the sub handles below, and the fourth-order crossover ties them together. The system impedance is 6 ohms, and the recommended amplifier power for the satellites is 10–100W RMS. It's a coherent package — the kind of system where the pieces were designed together rather than just thrown in a box.