Marshall Shrinks Its Party Speaker: the Bromley 150 Packs 230W and a Replaceable Battery into 6.3kg

Marshall has extended its Bromley party-speaker line downwards with the Bromley 150, a 6.3kg portable that sits beneath the existing Bromley 450 and 750 as the smallest and most easily carried of the three. It is priced at £399.99 in the UK and $499.99 in the US, with pre-orders already open through marshall.com and general sale beginning on 13 October 2026.

For context, eCoustics lists the two larger models at $799.99 for the Bromley 450 and $1,299.99 for the Bromley 750 — US pricing only; Marshall has not published UK figures for the siblings in the material we've seen. The 150 therefore lands at roughly the entry point of a range that has, until now, asked buyers to commit to something considerably heavier.

What's inside

Marshall quotes 230W of Class D amplification, split across one 90W amplifier and two 55W amplifiers. Those feed a 6.5-inch woofer and a pair of 2-inch full-range drivers, with a 7.5-inch passive radiator handling the bottom end's air movement. The company's stated frequency response is 40Hz to 20kHz, and maximum SPL is given as 97dB at one metre.

The driver layout is marketed under Marshall's "True Stereophonic 360°" banner — the manufacturer's own phrase for the arrangement, and one worth treating as branding rather than a measurement. A three-driver array in a 290mm cube is doing something clever with dispersion; what that amounts to in a given room, at a given listening position, is not something any spec sheet settles.

The battery is the interesting part

Marshall claims more than 40 hours of playback, which is a substantial figure for a speaker this size. A 20-minute quick charge is said to return five hours of use, and a full recharge takes three hours.

More notable, at least from a hi-fi perspective, is the chemistry and the fitment. The Bromley 150 uses a lithium iron phosphate (LiFePO4) cell, and Marshall says it is user-replaceable. Portable audio has spent the best part of a decade producing sealed products with a finite service life defined by a battery nobody can get at, so a design that treats the cell as a consumable rather than a structural component is a meaningful difference — a speaker whose battery can be swapped is a speaker that can outlive its first battery. Marshall has not published a capacity figure in Wh or mAh, so the quoted runtime is the only number to go on.

Build and weather resistance

At 6.3kg and 290 x 290 x 208mm, the Bromley 150 is genuinely a one-hand carry, helped by a retractable handle. The cabinet is FSC 100%-certified wood wrapped in PU leather, with TPU caps on the corners to absorb the knocks that a speaker like this will inevitably take. Marshall also describes the design as stackable, which suggests the flat-topped cube shape is deliberate rather than incidental.

Ingress protection is rated IP55, covering dust and water jets — enough for a garden, a beach or a damp festival field, though not a rating that invites submersion.

There is also music-synced stage lighting with three presets. Lighting is a standard feature in this category rather than a differentiator, but Marshall has carried it down from the larger Bromleys rather than treating it as a feature to cut at the lower price.

Connections

Wireless duties fall to Bluetooth 5.3, with both Auracast and multipoint support. Marshall quotes a range of 70-plus metres, which is the kind of figure that assumes a clear line of sight. The sources confirm Auracast support but say nothing about which other devices or Marshall models it can be grouped with, so that remains an open question.

Wired inputs are where the Bromley 150 separates itself from a straightforward Bluetooth speaker. Alongside a 3.5mm aux input and USB-C, there are two XLR/6.35mm combo sockets that accept microphones or instruments. That pushes the speaker into small-PA territory: a guitar and a vocal mic, or two mics, straight into a battery-powered box that weighs less than a bag of shopping. Combined with the 40-hour claim and the IP55 rating, it is a fairly clear pitch at buskers, small events and anyone who needs amplification somewhere without a mains socket.

Where it sits

The Bromley range now covers three sizes, and the 150's job is portability. It gives up the output and, presumably, the low-end authority of the 450 and 750 in exchange for being something you can actually carry to where the party is. Whether 230W and a 6.5-inch woofer translate into a satisfying sound in the open air is not something the specification answers, and we have not heard the speaker.

What the specification does tell you is that Marshall has not stripped out the features that give the range its character to hit the lower price — the stage lights, the combo inputs, the weatherproofing and the replaceable battery are all present. Pre-orders are live now via Marshall's own site, with wider availability from 13 October 2026.

Sources: StereoNET and eCoustics.

This article was written by an AI system from Into The HiFi AI Desk, generated from the following sources, with no human editing pass before publication: StereoNET — Marshall Bromley 150 Makes 360° Party Sound More Mobile, eCoustics — Marshall Bromley 150 Party Speaker Packs Stage Lights Into Compact Design.