Twin 8

Looking for the best performing plug and play subwoofer upgrade for your R35 GTR in the 500 watt class? This system is it. The Xtreme-Audio Twin 8 series systems are the best sounding, most comprehensive, easiest to install, and best looking custom GTR audio solution available. The purpose of the Twin 8 is to provide the best sounding, best looking, and most comprehensive turn-key ready system possible. Additional features of the Twin 8 systems are:

  • Comprehensive design
  • Easiest to install with minimal tools
  • Proven track record of sound quality and appearance
  • Factory plus style appearance
  • 500 RMS watts

These systems are handmade by an audio expert and GTR owner/enthusiast for other GTR owners. There are no compromises in this system and it is the quality that you would expect to come from the factory in the GTR. The Twin 8 is a full subwoofer replacement and does not sit behind the factory Bose cover. The Twin 8 is meticulously designed to enhance the factory interior and includes specific trim pieces and amplifier mounting brackets not available in other systems. The entire package is carefully designed for you to have a DIY install experience with no guesswork, a consistent final appearance, and excellent sound quality. The Twin 8 system has been refined and updated over the past 8 years and the current systems are at the pinnacle of design and performance. Are you already familiar with this system and looking to purchase a system for your own GTR? All options are available in our store with transactions being secure through PayPal. Please do contact us with any questions you have. This system is a modular design allowing you to custom build your own system. The three pieces of this system that you will need to pick from include:

  1. Enclosure type: Curved box (Gen5) vs. Slope box (Gen6)
  2. Subwoofers Options: JL Audio, Focal, Morel and Diamond Audio
  3. System Type: Empty box, box with subwoofers, or plug and play systems

Enclosure Options and Appearance

All Twin 8 enclosures are padded and upholstered with the same material as the GTR factory interior while being stitched with a double grey line of stitching. The enclosure is soft and luxurious to the touch, but is very durable because it is constructed from 5/8 MDF for structural rigidity and sound quality. Threaded inserts are built into each enclosure so the enclosure can be mounted to the vehicle with nuts and bolts as opposed to screws. Each enclosure has additional mounting bolts on the rear to attach the custom designed amp rack. The Twin 8 plug and play systems are the only option with a rear mounted amplifier rack and rear trim. This innovative design provides a secure mounting position for the amp, wastes no space in the trunk, and allows for proper amplifier venting and cooling. Ultimately, this allows you to get a professional quality install with no custom fabrication required on your end.

Curved Enclosures (Gen5): All enclosures have a curved shape, however the Curved Gen5 enclosures are curved only on one profile, being the side profile. The curvature is designed to match the curves of the rear seats. These enclosures feature an additional baffle layer where the subwoofers are recessed down into the enclosures for a flush top mount. The double walled baffle provides excellent rigidity and a refined appearance.

Sloped Enclosures (Gen6): Previously a limited production item, the Sloped Gen6 enclosures are a hybrid stacked fabrication design that is curved on two profiles being the side and front face. With the Sloped box, the subwoofers are mounted on the top side of the baffle and a trim ring is added and carefully sanded to shape. The inside “stacks” of the enclosure are routered to 45 degrees to improve airflow and reduce weight. Since the subwoofers are mounted on the top side of the box, it allows for more room behind the magnet and slightly more airspace. The Slope (Gen6) enclosures have slightly more airspace, additional mounting depth, are slightly lighter, and have a more rigid baffle compared to the Curved (Gen5) enclosures. These construction differences result in more time being spent building the box with contributes to this being a premium and higher priced item.

Equipment and Subwoofer Options

All available packages are equipped with 8″ high-performance quality-oriented subwoofers. Morel, Focal, JL Audio, and Diamond Audio are the subwoofers available with an optional plug and play power supply featuring JL Audio amplification and AudioControl active processing (for 2015+). All products offered have been selected to produce the best possible sound in the GTR cabin. The availability of each subwoofer is dependent on the supply. The power supply is compatible with all Twin 8 subwoofer combinations. Technical specifications can be seen below:  


Countless hours have been invested in research and development to create a customer-centric experience where you as the end user are able to install this system yourself. Installing custom parts yourself brings about a sense of pride while also saving you installation costs. The install is designed to be simple and intuitive by using the same bolt holes and openings that the factory subwoofer system uses. A comprehensive colour printed installation manual comes with the package, but you are always welcome to reach out if you have questions. Have a look at this YouTube walkthrough of a fellow GTR owner installing the system in his 2017 GTR. Please note the install process is different from year to year. There are four different install processes being 2009-2014, 2015-16, 2017-2020, 2020+. All processes are well documented and specific manuals are included with each system. Everything you need for the install (excluding tools) is included with your order. All full systems include the following:

  • Enclosure with wired and mounted subwoofers
  • Amplifier with all processing and audio signal connections completed and assembled on a 3M carbon wrapped amp rack
  • CNC manufactured amplifier to enclosure mounting plate
  • Trunk trim coverings (to conceal all wiring)
  • Upholstered rear console cover
  • Upholstered rear deck cover
  • Enclosure mounting brackets and bolts
  • Bass control knob for all 2015+ GTRs

It is important to note that enclosures can be purchased with or with subwoofers or the plug and play power supply. The Xtreme Audio Plug and Play amplifier rack bolts directly to the back of the enclosure. Power cables are run through an existing hole and a specially manufactured plug allows direct plug and play compatibility with the factory GTR wiring. The amp is accessible through the trunk with a gain control to adjust the bass to your preferences. Each system comes pre-tuned to maximize performance. Total install time is approximately 1-2 hours depending on your comfort level. All installation hardware is provided. To install this system you will need a 4mm Allen key, 14mm socket, 10mm socket, and a flat screwdriver.