Project Overview
Location: Baltimore, USA (Harbor East Business District)
Client: Apex Global Vanguard Investment Group
Product Used: HENGJIU Felt Custom Geometric-Cut PET Acoustic Wall Panels & 3D Embossed Panels
Quantity: 450 Square Meters (Covering 8 Executive Boardrooms & 5 Video Conferencing Hubs)
Thickness & Size: 9mm and 12mm dual-layer combination for enhanced low-frequency absorption
Color Scheme: Navy Blue, Corporate Grey, and Off-White Accents
The Challenge: Sound Leakage and Echo During High-Stakes Board Meetings
Apex Global Vanguard required a complete acoustic overhaul for their executive floor. The core issues centered around their high-end conference rooms, which featured extensive glass elements and hard-surface presentation walls:
Speech Privacy Failures: Confidential financial discussions inside the boardrooms were easily audible in the adjacent corridors, creating a compliance and privacy risk.
Flutter Echoes: During hybrid Zoom and Microsoft Teams meetings, the remote participants experienced a harsh “flutter echo” caused by parallel reflective walls, making communication exhausting.
Aesthetic Rigidity: The client rejected standard, boring acoustic foam. They demanded a seamless, corporate-identity-driven design that could double as a feature wall backdrop for global video broadcasts.
The Solution: Architectural-Grade Custom PET Wall Systems
HENGJIU Felt engineered a dual-performance wall cladding system using CNC geometric-cut PET felt panels to achieve a balance of premium interior design and maximum sound dampening.
Dual-Layer Frequency Absorption: We utilized a 12mm base panel topped with CNC-cut 9mm geometric overlays. This created intentional air cavities between the layers, significantly boosting the NRC to 0.90, particularly trapping mid-to-low human vocal frequencies (250Hz – 500Hz).
Seamless Aesthetic Integration: Instead of standard squares, the panels were precision-cut into a custom herringbone pattern with V-groove accents, matching the sleek corporate aesthetic of the investment firm.
Health & Safety Priority: Operating in an enclosed office space, the material’s EO Class formaldehyde-free rating and ASTM E84 Class A fire certification were critical to meeting Baltimore’s stringent commercial indoor air quality and safety codes.
The Implementation
The project required a zero-VOC installation method to ensure the rooms could be occupied immediately without chemical odors. Our engineering team specified a heavy-duty, eco-friendly water-based adhesive combined with mechanical clip systems for the 3D embossed panel sections.
The entire 450-square-meter wall area across 13 distinct rooms was completed over two consecutive weekends, resulting in absolute zero downtime for the client’s weekday trading operations.
The Result: Crystal-Clear Audio and Complete Privacy
Acoustic testing conducted post-installation highlighted a massive improvement in acoustic isolation and sound quality:
| Acoustic Performance Index | Pre-Project Status | Post-HENGJIU Implementation |
| Sound Transmission Class (STC) | STC 32 (Conversations easily understood outside) | STC 48 (Loud speech completely muffled/audible but unintelligible) |
| Reverberation Time (RT60) | 1.4 seconds (Heavy microphone echo) | 0.45 seconds (Studio-quality vocal clarity) |
| Video Call Audio Clarity | Fragmented / Muffled | Immersive, crisp, and broadcast-ready |