No. 25 - Celebrating 25 Years of REL

When the idea to create a 25th Anniversary model sprang to life, it quickly emerged that this had to be special - not simply a re-dressing of an existing model. As the project gathered steam, it became a statement of purpose about what the next 25 years of REL Acoustics would hold. The result is the REL No. 25 Reference subwoofer - both a glimpse of the future and a statement product all-in-one.

No. 25's engineering process started with the building of a new woofer. REL then worked backward through the amplifier requirements, cabinet topology, and necessary dimensions to pull all the attributes together into a powerful, finished design. The REL team wanted to see a near-field and dynamic output of at least 112 dB. They demanded greater control over room acoustics and the ability to deliver smoother, even bass over a greater spread of frequencies. The subwoofer would also have to move massive volumes of air.

In the end, a 15” woofer turned out to be the perfect blend of size and speed needed to bring the project home. No. 25's woofer has a heart of pure carbon, as REL opted for a cone material that is stronger than steel, yet incredibly lightweight. Carefully woven from pure carbon fiber, the 15” cone structure weighs 70% less than a 10” cone of just two years ago.

No. 25 combines this lightweight and perfectly balanced 15" woofer with the massive power of an ultra-reliable 1,000 watt amplifier. All this is controlled by REL's legendary filter sets and proprietary crossovers. Two separate parametric equalizers permit remarkably flat in-room response while maintaining the speed and resolution for which modern RELs have become known. In the end, REL slightly overshot their 112dB goals with a final output of 113db and low bass-extension down into the 15Hz region.

To enjoy all this performance without being limited to only a few room locations, the REL wireless LongBow system is built into every No. 25. This design utilizes zero compression, resulting in stunning dynamics and bass-extension - without being tethered to a cable.

No. 25 commemorates and celebrates REL's quarter century of building the finest subwoofer systems, all while pointing to the future and to their next 25 years.

Visit the Paragon showroom today for an in-store audition!