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A semi-anechoic chamber replicates an infinite reflective half-space: the floor is solid and acoustically reflective, while walls and ceiling are lined with sound-absorbing wedges. This configuration matches real-world operating conditions for most products, which are tested on floors or mounted on surfaces in use.

HEMU Acoustics semi-anechoic chambers are widely used for ISO 3745 sound power measurements, automotive component NVH characterization, household appliance noise rating (IEC 60704), and industrial equipment certification. Available with drive-in ramps and underfloor dynamometer foundations for full vehicle testing.

The reflective floor (typically polished concrete or steel plate) enables consistent half-space measurements. Our modular system accommodates widths from 4 m to 20 m, with ceiling heights up to 8 m. Custom configurations for electric vehicle powertrain testing, including grounding provisions and high-voltage cable penetrations, are available.

Background noise levels of NC-15 or lower are achievable, ensuring compliance with the most demanding measurement standards. All chambers are delivered with a full acoustic qualification report validated to the specified standard.