Mackie MB•24 Meter Bridge
A $799 accessory that lets you see a working console's levels at a glance.
Overview
The MB•24 is not a console. It is the optional tiltable meter bridge built for Mackie's 24•8, the 24-channel member of the company's 8-Bus recording console family. It was sold as an add-on, not a standalone product. It gives every input channel a ladder LED display and the main outputs a pair of VU meters, so an engineer isn't flying blind.
Mackie's own catalog copy for the 8-Bus line called the meter bridge "optional" and "tiltable," with ladder LEDs for each input channel plus VU meters for the main outputs. That is a fairly precise description of what the MB•24 adds to a 24•8. The bridge was never bundled with the console. It was a line-item upgrade, and the distributor sheets of the period list it separately at a manufacturer's list price of $799.00. The smaller MB•16 for the 16-channel board is $699.00 and the MB•32 for the 32-channel is $899.00. Electronic Musician's 8-Bus advertising of the era quoted the MB•24 at $795 suggested retail, slightly higher in Canada. That is close to the distributor figure, and street and list pricing drifted a little depending on who printed the sheet.
The MB•24 is not a mixer. The 8-Bus console it mounts to is the actual recording and PA board: 16, 24, or 32 channels, 100 mm precision faders, a separate tape monitor path, A and B mix paths, six aux sends and returns, four-band EQ with shelving highs and lows plus sweepable high-mid and low-mid, two headphone mixes, studio and control speaker mixes, talkback with a built-in mic, balanced XLR mic and TRS line inputs, balanced XLR main outputs, and balanced TRS sub outputs. The 24-channel version measures 37 inches wide, 28.8 inches deep, and 4.8 inches high without a meter, 9 inches with one fitted. The MB•24 accounts for that extra height.
Without its bridge, an 8-Bus console is a relatively low-profile slab. Add the MB•24 and a tilted meter pod sits across the top, which changes both the sightline and the footprint of the setup. Buyers hunting a used 24•8 should confirm whether the bridge is included. The bridge is a separate SKU, and it is easy to lose track of when a studio gets parted out.
On noise, Mackie's 8-Bus marketing leaned hard on what the company called Very Low Impedance Circuitry (VLZ). The argument was that lower internal circuit impedances reduce thermal noise and improve immunity to crosstalk. The company also made much of the console's "monster 220-Watt power supply" as deliberate over-engineering. None of that is the MB•24's doing, since the bridge is a display accessory and not a signal-path component. It is the context the bridge lives in, though, and owners of these desks tend to treat the console and its meter bridge as a single unit.
Period coverage of the 8-Bus family was largely advertising-driven in the trade press. EQ (February 1994, p.82) ran the console's own promotional material describing the optional tilt-up meter bridges. It noted that the metering is globally switchable to see tape return preamps or channel signals. That is useful during mixdown, since the engineer can choose whether the LEDs watch the console input or what's coming back off tape. EQ (March 1994, p.22) carried a similar placement. These are manufacturer-sourced claims appearing in print, not independent bench tests. They do confirm the bridge's switching behavior as a design feature.
Mackie pitched the console as a system that could grow. Start with a 24•8 or 32•8, add the meter bridge when budget allows, then add input channels in groups of twenty-four via the 24•E Expander console, and eventually automate with the Universal MIDI Automation package: the OTTO-34 VCA gain cell unit, Ultramix Pro software, and the OTTOpilot control interface. The company claimed the system could grow to 128 channels or more. A sidecar (the SC8) with eleven rack spaces for patch bays and power supplies, plus floor stands, rounded out the accessory list. The MB•24 is the second step in that ladder. It was bought by people who were actively building out a studio, and it stayed with the console, which makes it hard to find today.
Nobody buys a meter bridge on its own. It only makes sense bolted to a 24•8, so the practical market is people restoring or reassembling an 8-Bus desk. That keeps prices modest relative to the console itself. Condition and completeness (mounting hardware, cable, the tilt mechanism) matter more than cosmetics. If the LEDs or VU meters are dead, the value drops accordingly, and there's no reason to expect the metering to have aged better than anything else from the period. Test every segment before committing.
The MB•24 reflects early-90s project-studio thinking: the console as a modular platform, sold in pieces, with the metering treated as an upgrade rather than a given. Mackie's own advertising talked of tax refunds and landing the Really Big Project, which suggests the company knew which budget it was speaking to.
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