Monitor Audio SB-4 Passive Soundbar

Monitor Audio SB-4 Soundbar

Passive 3-channel soundbar designed for 70-inch screens and larger, with separate left, centre, and right driver arrays in one cabinet for cleaner TV audio without a full front-speaker stack.

The SB-4 is the biggest of the passive Monitor Audio soundbars and makes sense when the screen is large enough that smaller soundbars start to look or sound undersized. It is still a passive model rather than an all-in-one powered bar, which makes it a sensible choice for customers who want a tidier TV setup while still using a proper AV receiver or amplifier.

It uses three discrete channel arrays inside one enclosure, making it a very practical option when you want better television sound without filling the room with separate front speakers.

Built for the Biggest TV Systems

A sensible option when the room needs better sound without filling the front wall with speakers

The SB-4 is designed for 70-inch screens and larger, which gives it a clear use case in living rooms, media rooms, and cleaner wall-mounted TV systems where separate front speakers may feel like too much visual clutter.

That is the real appeal here. The SB-4 is a proper passive LCR-style soundbar for customers who want a cleaner front end while still using real AV electronics behind the system.

Three Separate Driver Arrays

Left, centre, and right channels in one cabinet

The SB-4 uses three separate driver arrays for left, centre, and right channels. All channels use 2 x 4-inch C-CAM bass/mid drivers and 2 x 1-inch C-CAM Gold Dome tweeters, with Auxiliary Bass Reflex loading.

That matters because it gives the SB-4 a much more serious speaker layout than a token TV bar with a handful of tiny full-range units.

More Scale Than the SB-2 and SB-3

A better fit when the room and screen size push into bigger territory

The SB-4 has 70 Hz – 30 kHz frequency response, 87 dB sensitivity, 8-ohm nominal impedance, 80 W recommended RMS power, and 100 W system power handling with the high-pass filter set to 100 Hz. Recommended amplifier power is 30 – 100 W, crossover frequency is 80 – 120 Hz, and maximum SPL is 104 dB, rising to 108.8 dB with all channels driven.

That makes the SB-4 the more substantial passive soundbar option for the largest displays and slightly more ambitious rooms in the range.

Optional Bracket for a Cleaner Install

Simple mounting support when the soundbar needs to sit neatly with the screen

The BSB is the matching bracket for the SB-4. The cabinet measures 145 x 1562 x 89 mm including feet, and 145 x 1562 x 100 mm including bracket.

That is useful because a soundbar like this only really makes sense if the installation stays clean. A matched bracket is a much better answer than improvising with a generic mount that only half fits.

Specifications

Detailed Technical Specifications

For those who like to drag out all the useful bits

The Audio Experts Take

The SB-4 makes a lot of sense when the brief is a cleaner TV setup that still uses proper speaker engineering, and the screen is large enough that smaller soundbars start to feel visually or sonically underdone. The 3-channel layout, C-CAM drivers, Gold Dome tweeters, and passive design all point to a soundbar aimed at customers who want a tidier front end without dropping down to flimsy built-in TV sound.

What we like here is that it looks commercially honest. It is not pretending to replace a full surround system all by itself, but it does give you a neat and sensible way to improve TV sound properly on a very large screen. For 70-inch-plus TVs in living rooms, media rooms, and cleaner AV spaces, the SB-4 looks like a very solid option.

Brand new. Contact us for current availability, amplifier matching, and subwoofer pairing advice.