Question 1

What is an anechoic chamber?

Accepted Answer

An anechoic chamber is a room designed to absorb sound reflections from all six surfaces (walls, ceiling, and floor for fully anechoic; five surfaces for semi-anechoic). This creates a free-field acoustic environment — the same conditions as an open outdoor space — for precise acoustic measurements without interference from room reflections.

Question 2

What is the difference between a fully anechoic and a semi-anechoic chamber?

Accepted Answer

A fully anechoic chamber absorbs sound from all surfaces including the floor (which is typically a wire-mesh walkway above floor wedges). A semi-anechoic chamber has a hard, reflective floor simulating ground-plane conditions — standard for automotive NVH and household appliance testing per ISO 3745.

Question 3

What cutoff frequency can you achieve?

Accepted Answer

Our standard chambers achieve cutoff frequencies of 80 Hz (fully anechoic) or 100 Hz (semi-anechoic). For demanding low-frequency applications, we can design chambers with cutoff as low as 50 Hz using extra-deep wedge systems — typically 1.2 m to 1.5 m wedge depth.

Question 4

What insertion loss do your soundproof enclosures achieve?

Accepted Answer

Standard industrial enclosures deliver 25–35 dB insertion loss. High-performance chambers achieve 40–60 dB. Exact insertion loss depends on panel construction, sealing detail, and the frequency range. We provide third-party verified insertion loss curves for every product.

Question 5

What standards do your chambers comply with?

Accepted Answer

Our chambers are designed to comply with ISO 3745 (anechoic and semi-anechoic rooms), ISO 26101 (free-field conditions), IEC 60268-5 (sound system equipment), ISO 11546 (enclosure insertion loss), and EN ISO 3744 (sound power). CE marking is standard; ATEX variants are available.

Question 6

How much does an anechoic chamber cost?

Accepted Answer

Anechoic chamber cost varies significantly by size, cutoff frequency, and isolation specification. As a general guide: compact laboratory chambers (5–20 m³) typically range from USD 30,000 to USD 120,000; mid-size research or production-line chambers (20–100 m³) from USD 100,000 to USD 500,000; large automotive NVH facilities (100 m³+) from USD 400,000 upward. Office acoustic pods start from USD 3,000 per unit. Contact us with your application details for a project-specific quotation — our engineers will respond within 24 hours.

Question 7

How do I get a quote for an acoustic chamber?

Accepted Answer

Contact us with your key requirements: intended application, target frequency range, required insertion loss or free-field radius, chamber dimensions (or available floor space), and delivery country. Our engineers will respond with a preliminary proposal within 24 hours and a detailed specification within 2–3 business days.

Question 8

Can you build custom sizes?

Accepted Answer

Yes. All HEMU Acoustics chambers are made to order. We have supplied chambers ranging from compact 5 m³ transducer measurement rooms to large-scale automotive drive-in facilities exceeding 300 m³. Standard modular sizes are available for faster delivery.

Question 9

What is the typical lead time?

Accepted Answer

Standard modular chambers: 6–8 weeks. Custom-engineered chambers: 10–16 weeks. Large automotive NVH facilities: 20–28 weeks. Lead times include acoustic design, fabrication, and factory pre-assembly testing.

Question 10

Do you offer factory acceptance testing?

Accepted Answer

Yes. All chambers undergo full acoustic acceptance testing at our Shanghai facility before shipment. Customers are welcome to witness the test. We provide a comprehensive test report with insertion loss curves and background noise measurements.

Question 11

What after-sales support do you provide?

Accepted Answer

We provide on-site installation and commissioning by our acoustic engineers, operator training, a spare parts service, and remote technical support. Annual maintenance inspections and wedge integrity checks are available as service contracts.

Question 12

What is the warranty on your chambers?

Accepted Answer

Standard warranty is 12 months from commissioning or 18 months from shipment (whichever comes first). The warranty covers structural integrity, acoustic performance (to specified insertion loss), and all mechanical components under normal operating conditions.

Question 13

Can you upgrade or expand an existing chamber?

Accepted Answer

In many cases yes. We can add additional wedge layers to improve low-frequency performance, replace worn wedge materials, expand chamber volume with modular panels, or retrofit double-door acoustic vestibules. Contact us with photos and existing test reports for an assessment.

Question 14

Do you ship internationally?

Accepted Answer

Yes. We have installed acoustic chambers in 60+ countries across Europe, North America, Asia-Pacific, the Middle East, and South America. We handle full export documentation and can arrange sea or air freight with professional packing.

Question 15

How long does installation take?

Accepted Answer

A standard modular chamber (up to ~50 m³) typically takes 3–7 days to install. Larger custom chambers may require 2–4 weeks. Our installation team handles all structural assembly, door fitting, electrical connections, and acoustic sealing.

Question 16

What site preparation is required?

Accepted Answer

Typically a level concrete floor (flatness tolerance ±5 mm over 3 m), adequate headroom, and an electrical supply point. For heavy chambers we may specify a reinforced floor slab. We provide a detailed site preparation checklist after order confirmation.

Question 17

How long has HEMU Acoustics been manufacturing acoustic chambers?

Accepted Answer

HEMU Acoustics (Shanghai Hemu Intelligent Technology Co., Ltd.) has been engineering acoustic environments since 2004 — over 20 years. We have installed more than 500 chambers worldwide across automotive, consumer electronics, HVAC, data centre, and office applications.

Question 18

Can I visit your factory?

Accepted Answer

Yes. We welcome technical visits to our manufacturing facility in Xinchang Town, Pudong, Shanghai. You can see chambers at various stages of production, inspect our wedge fabrication process, and tour our own in-house anechoic measurement room. Contact us to arrange a visit.

Question 19

Do you have local representatives?

Accepted Answer

We have sales and technical partners in Germany, the United Kingdom, Japan, South Korea, India, and the United States. Contact us for the nearest partner or to work directly with our Shanghai engineering team.

Frequently Asked Questions

📐Products & Specifications

📋Ordering & Customisation

🔧Technical Support & Service

🚢Shipping & Installation

🏢About HEMU Acoustics

Still Have Questions?