11. An anechoic chamber is also commonly used. 12. RF anechoic chambers are normally designed to meet the electrical requirements of one or more accredited standards. 13. Professor Balanis is the " architect " of the Arizona State University ElectroMagnetic Anechoic Chamber ( EMAC ). 14. Some developers eschew anechoic chambers in favor of specific standardized room setups intended to simulate real-life listening conditions. 15. Building 20 also housed one of the first anechoic chambers , where research was performed by acoustics pioneer Leo Beranek. 16. EA-1 primarily supports ground testing in the Air Combat Environment Test and Evaluation Facility ( ACETEF ) anechoic chamber . 17. The building also has several acoustics labs including two anechoic chambers and a reverberation chamber for performing acoustics research. 18. Some people feel unsettled when they first experience an anechoic chamber due to the sudden absence of this phenomena. 19. Anechoic chambers range from small compartments the size of household microwave ovens to ones as large as aircraft hangars.20. See Anechoic chamber for the basic design, but be aware that it works only because the light source is'inside'the room.