Bromley 750 delivers up to 128 dB of powerful sound. It’s the loudest speaker Marshall has ever released.

That kind of volume is serious, so keep in mind it can cause hearing damage if you’re standing too close at full blast.

Bromley comes with a replaceable battery, pre-installed right out of the box. The battery can be removed and charged separately and also functions as a power bank to charge external devices.

The speaker can operate directly from the included mains cable, even if the battery is not inserted. When connected to mains power with the battery installed, the system will simultaneously charge the battery while running the speaker.

Under typical use conditions, you can expect 40+ hours of playtime at volume step 5 with the light show turned off. Actual runtime will vary depending on several factors, including volume level, light show activity, music type, sound character settings, and the acoustic environment.

Higher volumes and active light shows will naturally reduce battery life.

The Light button allows you to toggle between three built-in light show presets. Each offering a distinct visual pattern synced to your audio. If you prefer a more minimal experience, you can also switch the light show off entirely. At this stage, custom light configurations are not supported, preset selection only.

Keep in mind, the lights do consume a significant amount of battery power, so turning them off can help extend playtime.