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[BUILD LOG] SQ Door Deadening – Multi‑Layer Treatment (Aero Gold + C3S + Accent + C6S) – Work in Progress
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<blockquote data-quote="DonHugo" data-source="post: 8921894" data-attributes="member: 694541"><p>Hi everyone,</p><p></p><p>this is my SQ‑oriented door deadening build, using a multi‑layer approach similar to high‑end shop installs.</p><p>The project is currently 50% complete, and I’m sharing progress as I go.</p><p></p><p></p><p><strong>1. Goal of the Project</strong></p><p>Build a rigid, sealed and acoustically optimized midbass chamber, eliminate resonance, reduce road noise and stabilize the door structure for high‑quality front stage performance.</p><p></p><p>This is not a basic “deadening job” — this is a full SQ Door Build.</p><p></p><p><strong>2. Factory Condition (Before)</strong></p><p>The stock door had:</p><p></p><p>large open service holes</p><p></p><p>thin outer skin with noticeable resonance</p><p></p><p>minimal OEM damping</p><p></p><p>plastic door card with no decoupling</p><p></p><p>speaker mounted on factory rivets</p><p></p><p>no acoustic sealing around the driver</p><p></p><p>Result: weak midbass, panel buzz, energy loss, and poor acoustic control.</p><p></p><p><strong>3. Materials Used (SQ‑grade configuration)</strong></p><p>Outer Skin (external metal panel)</p><p>Layer 1: STP Aero Gold 2.3 mm</p><p>Layer 2: Bitmat C3S</p><p></p><p>Purpose:</p><p></p><p>Aero Gold stiffens the outer skin</p><p></p><p>C3S absorbs reflections and reduces road noise</p><p></p><p>Together they create a “dead” acoustic surface</p><p></p><p>Inner Metal Panel (technical plate)</p><p><strong><span style="color: rgb(184, 49, 47)"><img class="smilie smilie--emoji" loading="lazy" alt="⚠️" title="⚠️" src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/26a0.png" /> CURRENTLY IN PROGRESS (ONGOING) </span></strong></p><p>Layer 1: STP Aero Gold</p><p>Layer 2: Bitmat Accent</p><p></p><p>Purpose:</p><p></p><p>Aero Gold eliminates resonance of the structural plate</p><p></p><p>Accent absorbs reflections and decouples the door card</p><p></p><p>This stage is critical for midbass control and overall SQ</p><p></p><p>More photos and updates will follow as this part is being completed.</p><p></p><p><strong>Door Card (plastic panel)</strong></p><p>Layer 1: Aero Gold – spot treatment</p><p>Layer 2: Bitmat C6S</p><p></p><p>Purpose:</p><p></p><p>spot Aero Gold stiffens key areas</p><p></p><p>C6S decouples the card and prevents rattles</p><p></p><p>improves door behavior and reduces coloration</p><p></p><p>Speaker Mounting (premium upgrade)</p><p>M5 aluminum rivet‑nuts</p><p></p><p>stainless steel bolts</p><p></p><p>Bitmat foam ring behind the speaker</p><p></p><p>Purpose:</p><p></p><p>rigid, serviceable mount</p><p></p><p>zero micro‑movement</p><p></p><p>improved midbass attack</p><p></p><p>directs sound into the cabin, not into the door</p><p></p><p><strong>4. Process (So Far)</strong></p><p></p><p>4.1 Outer Skin – COMPLETED</p><p>Aero Gold applied to large flat areas</p><p></p><p>fully rolled for maximum adhesion</p><p></p><p>C3S applied on top for absorption and noise reduction</p><p></p><p>4.2 Door Card – COMPLETED</p><p>spot Aero Gold stiffening</p><p></p><p>full C6S decoupling layer</p><p></p><p>no rattles, no plastic resonance</p><p></p><p>4.3 Inner Metal Panel – IN PROGRESS</p><p>Currently working on:</p><p></p><p>applying Aero Gold to the structural plate</p><p></p><p>adding Accent foam</p><p></p><p>preparing for final sealing and assembly</p><p></p><p>This is the most delicate part of the build and will be updated soon.</p><p></p><p><strong>5. Results (So Far)</strong></p><p>Midbass</p><p>stronger punch</p><p></p><p>better attack</p><p></p><p>no panel resonance</p><p></p><p>Mids</p><p>cleaner</p><p></p><p>less coloration</p><p></p><p>Noise Reduction</p><p>noticeable drop in road noise</p><p></p><p>door feels heavier and more “premium”</p><p></p><p>Overall</p><p>The door already behaves more like a proper enclosure, even before finishing the inner panel.</p><p></p><p><strong>6. Summary</strong></p><p>This build uses a 4‑layer system:</p><p></p><p>Door Area Layer 1 Layer 2 Status</p><p>Outer Skin Aero Gold C3S ✔ Done</p><p>Inner Panel Aero Gold Accent <img class="smilie smilie--emoji" loading="lazy" alt="🔧" title="🔧" src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f527.png" /> In progress</p><p>Door Card Aero Gold (spot) C6S ✔ Done</p><p>Plus a premium speaker mount with rivet‑nuts and foam sealing.</p><p></p><p>More updates coming as the inner panel work continues.</p></blockquote><p></p>
[QUOTE="DonHugo, post: 8921894, member: 694541"] Hi everyone, this is my SQ‑oriented door deadening build, using a multi‑layer approach similar to high‑end shop installs. The project is currently 50% complete, and I’m sharing progress as I go. [B]1. Goal of the Project[/B] Build a rigid, sealed and acoustically optimized midbass chamber, eliminate resonance, reduce road noise and stabilize the door structure for high‑quality front stage performance. This is not a basic “deadening job” — this is a full SQ Door Build. [B]2. Factory Condition (Before)[/B] The stock door had: large open service holes thin outer skin with noticeable resonance minimal OEM damping plastic door card with no decoupling speaker mounted on factory rivets no acoustic sealing around the driver Result: weak midbass, panel buzz, energy loss, and poor acoustic control. [B]3. Materials Used (SQ‑grade configuration)[/B] Outer Skin (external metal panel) Layer 1: STP Aero Gold 2.3 mm Layer 2: Bitmat C3S Purpose: Aero Gold stiffens the outer skin C3S absorbs reflections and reduces road noise Together they create a “dead” acoustic surface Inner Metal Panel (technical plate) [B][COLOR=rgb(184, 49, 47)]⚠️ CURRENTLY IN PROGRESS (ONGOING) [/COLOR][/B] Layer 1: STP Aero Gold Layer 2: Bitmat Accent Purpose: Aero Gold eliminates resonance of the structural plate Accent absorbs reflections and decouples the door card This stage is critical for midbass control and overall SQ More photos and updates will follow as this part is being completed. [B]Door Card (plastic panel)[/B] Layer 1: Aero Gold – spot treatment Layer 2: Bitmat C6S Purpose: spot Aero Gold stiffens key areas C6S decouples the card and prevents rattles improves door behavior and reduces coloration Speaker Mounting (premium upgrade) M5 aluminum rivet‑nuts stainless steel bolts Bitmat foam ring behind the speaker Purpose: rigid, serviceable mount zero micro‑movement improved midbass attack directs sound into the cabin, not into the door [B]4. Process (So Far)[/B] 4.1 Outer Skin – COMPLETED Aero Gold applied to large flat areas fully rolled for maximum adhesion C3S applied on top for absorption and noise reduction 4.2 Door Card – COMPLETED spot Aero Gold stiffening full C6S decoupling layer no rattles, no plastic resonance 4.3 Inner Metal Panel – IN PROGRESS Currently working on: applying Aero Gold to the structural plate adding Accent foam preparing for final sealing and assembly This is the most delicate part of the build and will be updated soon. [B]5. Results (So Far)[/B] Midbass stronger punch better attack no panel resonance Mids cleaner less coloration Noise Reduction noticeable drop in road noise door feels heavier and more “premium” Overall The door already behaves more like a proper enclosure, even before finishing the inner panel. [B]6. Summary[/B] This build uses a 4‑layer system: Door Area Layer 1 Layer 2 Status Outer Skin Aero Gold C3S ✔ Done Inner Panel Aero Gold Accent 🔧 In progress Door Card Aero Gold (spot) C6S ✔ Done Plus a premium speaker mount with rivet‑nuts and foam sealing. More updates coming as the inner panel work continues. [/QUOTE]
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[BUILD LOG] SQ Door Deadening – Multi‑Layer Treatment (Aero Gold + C3S + Accent + C6S) – Work in Progress
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