Ok. Well our basic rule of thumb if in doubt rip it out. If you have doubt of the connections start again.
I'd relocate the crossovers to the dash area although acoustic liner should help isolate the rattles. Taping the speaker wires together is fine.
A great audio setup and perfect tune can be completely undermined by poor sound deadening. Rattles not only distract from the music but also instantly pull the sound stage to the location of the noise, ruining the intended experience.
... Cue lecture.
Sound deadening is about much more than just making a car quieter. It's a fundamental process that transforms your driving experience by targeting and eliminating different types of unwanted noise. The core principle behind a truly effective system is a multi-layer approach, as each layer serves a specific purpose to combat a different kind of noise.
The importance of this system lies in its ability to address every source of sound, from vibration to airborne noise. Your "Dead Doors" package is an excellent example of this, using a targeted combination of materials to achieve a level of quiet and audio clarity that a single material simply cannot.
Outer Skin: Anti-Vibration Mat & Superliner
This part of the system focuses on the main culprit of road noise and speaker distortion.
* Anti-Vibration Mat (Damping): This is the critical first layer. Applied directly to the outer metal skin of the door, it adds mass to the large, thin metal panels. By doing this, it converts vibrational energy from road noise and bass into silent, thermal energy. This action stops the door from acting like a drumhead, which is the primary source of that "tinny" sound and annoying rattles.
* Superliner (Closed Cell Foam): The closed cell foam is a smart second layer. It's applied over the damping mat and acts as a decoupler and a sound absorber. Its main job is to prevent the outer metal skin from vibrating against other components and to soak up some of the high-frequency airborne noise. It also helps to insulate the door, which is a great side benefit.
Inner Skin & Door Card: Multi-Layered Defence
This part of the system is designed to create a solid, stable surface for your speakers and to eliminate rattles and buzzes from the plastic door cards.
* Inner Skin Anti-Vibration Mat: Applying another layer of the anti-vibration mat to the inner skin of the door makes for an incredibly stable mounting point for your speakers. This provides a solid surface for the speaker to work from, allowing the sound to be cleaner and more accurate without being distorted by the vibrating door panel.
* Door Card Anti-Vibration Mat: This layer specifically tackles plastic rattles and buzzes. It adds mass to the plastic door card, which stops it from vibrating and rattling in sympathy with the music or bumps in the road.
* Acoustic Liner (Acoustic Foam): The final layer is an acoustic liner, which is applied between the door card and the inner metal door frame. This material is designed for sound absorption and is crucial for audio performance. It absorbs the sound waves that bounce around inside the door cavity, such as the back-wave from the speaker, which reduces echo and gives a much clearer, more professional sound. It also serves as a final decoupling layer to ensure the door card fits snugly and silently.
By combining these different materials in a specific way, it creates a comprehensive defence against all types of noise. The result is a substantial reduction in cabin noise, a more refined and solid feel to the vehicle, and a significant improvement in the quality of your in-car audio system.
The guys you see on Instagram stick a few sheets on or worse a few pretty (remove the R) little triangular bits on the raised areas of the inner skin and claim they've "sound deadened the doorx is just laughable.
