Hemi Anechoic Acoustic Chamber

What is a Hemi-Anechoic Chamber?

Hemi-Anechoic Chambers provide a precision free-field environment above a reflecting plane. These chambers are commonly used to test sound sources over a hard, non-acoustically absorbent floor, which is essential for evaluating larger, heavier items. Applications include testing microphones, hearing protection devices, and hi-fi equipment, particularly where operation over a reflective surface, like a floor or road, is typical. The hard floor allows for realistic testing conditions when a fully anechoic environment would be impractical.

1. Measurement Target

Precision equipment, automobile parts, electronic parts, nano technology related products, environment-related products, etc.

2. Measurement Purpose

Sound power level, sound intensity measurement, abnormal noise inspection, product performance acoustic measurement, etc.

3. Measuring Equipment

Ordinary, precision sound level meter, FFT analyzer, vibration meter, various acoustic evaluation equipment, etc.

Wedge

T-250

Non-flammable sound absorption wedge: T-250:
Sound absorption wedge thickness 250mm

Sound insulation Solameta panel: 3TS65

HV02W

Compact wedge HV02W: Sound absorption wedge
thickness 310mm

Sound insulation Solameta panel: 3TS65

T-500

Non-flammable sound absorption wedge: T-500:
Sound absorption wedge thickness 500mm

Sound insulation Solameta panel: 3TS65

Hemi Anechoic Chamber Dimension

Type	Wedge	Effective (mm)	External Dimensions (mm)
DMC-ASACWOF-27312800	HV02W	W2000 x L2400 x H2450	W2700 x L3100 x H2800
DMC-ASACWF-27312900	HV02W	W2000 x L2400 x H2450	W2700 x L3100 x H2900
DMC-ASACWOF-31372800	HV02W	W2400 x L3000 x H2450	W3100 x L3700 x H2800
DMC-ASACWF-31372900	HV02W	W2400 x L3000 x H2450	W3100 x L3700 x H2900
DMC-ASACWOF-37432800	HV02W	W3000 x L3600 x H2450	W3700 x L4300 x H2800
DMC-ASACWF-37432900	HV02W	W3000 x L3600 x H2450	W3700 x L4300 x H2900
DMC-ASACWOF-27312800	T-250	W2000 x L2400 x H2450	W2700 x L3100 x H2800
DMC-ASACWF-27312900	T-250	W2000 x L2400 x H2450	W2700 x L3100 x H2900
DMC-ASACWOF-31372800	T-250	W2400 x L3000 x H2450	W3100 x L3700 x H2800
DMC-ASACWF-31372900	T-250	W2400 x L3000 x H2450	W3100 x L3700 x H2900

Hemi Anechoic Chamber Dimension

Type	Wedge	Effective (mm)	External Dimensions (mm)
DMC-ASACWOF-37432800	T-250	W3000 x L3600 x H2450	W3700 x L4300 x H2800
DMC-ASACWF-37432900	T-250	W3000 x L3600 x H2450	W3700 x L4300 x H2900
DMC-ASACWOF-32363050	T-500	W2000 x L2400 x H2450	W3200 x L3600 x H3050
DMC-ASACWF-32363150	T-500	W2000 x L2400 x H2450	W3200 x L3600 x H3150
DMC-ASACWOF-36423050	T-500	W2400 x L3000 x H2450	W3600 x L4200 x H3050
DMC-ASACWF-36423150	T-500	W2400 x L3000 x H2450	W3600 x L4200 x H3150
DMC-ASACWOF-42483050	T-500	W3000 x L3600 x H2450	W4200 x L4800 x H3050
DMC-ASACWF-42483150	T-500	W3000 x L3600 x H2450	W4200 x L4800 x H3150

Sound Insulation (Transmission Loss)/dB

Hz	Wedge	63	125	250	500	1K	2K	4K	8K
Guarantee Value of Sound Insulation	HV02W	-20	30	36	40	49	53	55	54
	T-250	-28	35	41	45	51	55	57	56
	T-500	-32	40	46	50	56	60	62	61
Actual Value of Sound Insulation	HV02W	32.6	49.4	62.4	74.5	77.8	83.1	81.5	81.5
	T-250	33.4	50.3	59	63.1	64.9	68.6	78	84.2
	T-500	41.9	50.8	60.1	71.3	75.1	77.3	79.9	86

Measurable Range/m

Hz	63	80	100	125	160	200	250
DMC-ASACWF-37432900	0.28	0.44	0.65	0.87	1.08	1.55	2.71
DMC-ASACWF-37432900	0.14	0.17	0.21	0.28	0.4	0.5	0.9
DMC-ASACWF-42483150	0.31	0.46	0.74	1.39	2.83	2.83	2.83

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Frequently Asked Questions

A Hemi Anechoic Acoustic Chamber is a controlled acoustic testing environment with sound-absorbing wedges on the walls and ceiling, while the floor remains reflective. It is designed to accurately measure sound power levels, noise emissions, and acoustic performance under free-field conditions above a reflecting plane.

Hemi Anechoic Acoustic Chambers are widely used for testing automotive components, household appliances, HVAC systems, electric motors, industrial machinery, electronic products, and research equipment. They help manufacturers evaluate product noise and meet acoustic testing standards.

A Hemi Anechoic Chamber has a reflective floor that simulates real-world operating conditions, whereas a Fully Anechoic Chamber has sound-absorbing wedges on all six surfaces, including the floor, creating a completely reflection-free environment.

Yes. Hemi Anechoic Acoustic Chambers can be customized based on chamber dimensions, acoustic wedge thickness, sound insulation performance, doors, lighting, ventilation, measurement equipment, and other project-specific testing requirements.

DMCRF designs and manufactures high-quality Hemi Anechoic Acoustic Chambers with modular construction, premium acoustic absorbers, customizable layouts, and compliance with international acoustic testing requirements. The chambers deliver accurate, repeatable, and reliable noise measurement results across various industries.

Hemi Anechoic Acoustic Chamber