Freq absorption: 150Hz – 20 Khz
Dimensions: 600 x 600 x 75mm
Colour: Charcoal Grey or flock colour coated
Applications: Absorber or Hybrid Absorber/Diffuser
Diffusion above 400Hz, absorption down to 150Hz

The HybridAcoustic HA600/75* is a versatile acoustic panel that can function purely as an simple absorber or alternatively, as a hybrid diffuser/absorber.
The HA600/75 acoustic panel is designed to receive a polycarbonate diffuser insert for the purpose of modifying the acoustic characteristics of the panel. Forming a smooth radius, the diffuser effectively scatters high frequencies. The diffuser insert also provides the additional benefit of extending the low frequency absorption of the panel.

Diffusion and absorption.
In most listening and music production environments, its is desirable that the acoustic treatment provides both absorption and diffusion. Reflected high frequencies give a room a sense of space and proportion, a necessary component of creating a pleasing acoustic environment. Diffusion prevents harsh reflections, while allowing sound to dissipate in a more natural way. Lower frequencies (below 300Hz) tend to create more problems than high frequencies in regards to the harmonic characteristics of a room. Certain frequencies can appear louder and others quieter, creating accuracy issues in both the recording and reproduction of music. The HA600/75 has been developed to help address both these issues.
A perfect balance of absorption and diffusion.
Without the insert (see graph) the HA600/75 functions as a quality broadband absorber, providing the performance expected of a 75mm thick panel. The ability of acoustic foam to absorb lower frequencies is directly related to thickness. With the diffuser insert installed a smooth roll-off of high frequencies occurs above 400Hz, down to a continuing flat absorption co-efficent of .5 (50%). Above 400Hz the HA600/75 provides a useful and controlled balance of absorption and diffusion. The diffuser insert also behaves as a resonator panel, significantly increasing the performance of sound absorption below 400Hz ,achieving a considerable 70% absorption at 160 Hertz. The HA600/75 also complements the BT600/150 bass trap, providing a complete acoustic solution.

Extract from RMIT test report. Original report available on request.