

About The Elementi Audio Onyx Slim Subwoofer
Onyx Slim is a custom installation subwoofer designed to be the primary LFE subwoofer or to balance room modes when used with the larger Obsidian subwoofer. This Slim version can be mounted behind screens to reinforce and even out the bass response throughout the cinema. This subwoofer uses a 15” Neodymium ultra-low distortion driver with a 4” voice coil for low power compression and will handle 2,400W of amplifier power. Its energy is focused to produce high SPL and flat frequency response from 30-150Hz and then roll-off down to 20Hz.
Onyx Slim comes with a resilient on-wall mounting system to ensure that no vibrations transfer from the subwoofer directly into the structure of the cinema, further ensuring tight and clean bass at all times.
All Elementi subwoofer are fully digital and benefit from floating 32 point DSP processing, digital crossovers, FIR filters with correction in the frequency and time domains, look forward speaker protection, high flow PASCAL amplifiers and high quality D/A converters. All amplifiers are specified with 3dB of headroom at maximum output to ensure there is no clipping or general distortion. Each speaker is custom tested and run in to ensure optimal performance out of the box.
Elementi has been meticulously created to deliver the immersive, high-performance cinema experience you love by Australia’s leading Home Cinema Design Engineer and Acoustician, David Moseley, of Australia’s most awarded cinema design company - Wavetrain Cinemas.
Expertly crafted for unparalleled sound quality and performance, Elementi elevates your home cinema experience, delivering bespoke-tailored sound pressure levels through four distinct models: Earth, Water, Air and Fire.
Inspired by the four elements, each model provides a unique sound experience, from deep, earthy bass, to breath-taking surround sound. Transforming your home theatre into a bespoke cinema-quality destination to be lived in and enjoyed. One that’s uniquely yours.
Our Review
The Elementi Audio Onyx Slim Subwoofer is all about bringing the kind of bass you don’t just hear but feel. Designed to tuck neatly behind screens, it adds depth and energy to your cinema without taking up space, making every rumble and low-end detail more lifelike and exciting. Whether it’s carrying the weight of your main system or working alongside a bigger sub like the Obsidian to balance the room, the Onyx Slim keeps the bass tight, clean and beautifully controlled. It’s been crafted with care so you can simply sink into the movie, knowing the low-end will be powerful yet refined - turning every film into a more immersive and unforgettable experience.
Main Features & Specifications
- Design: High Output On-Wall Custom Installation Active Subwoofer – Sold Individually
- Please Note: Subwoofer requires matching Elementi amplifier with DSP processing and digital crossovers
- Use: Wall Mounted Subwoofer
- Bass Driver: 15” (381mm) Neodymium Driver
- Amplification Requirements: Elementi 1,000 or 2,200W Module
- Frequency Range: 20-150Hz
- Continuous/Peak Output @1m: 119 + 3dB Headroom
- Distance From Seats: 5-7m
- Impedance: 8 Ohms
- Dimensions (WxHxD): 450 x 1,046 x 230mm
- Manufacturer's Warranty: 5 Years
Note: Features & Specifications Subject To Change Without Notice. E&OE.
