31. Its 12 new sound fields bring the unit's total to 39 and include one specifically developed to enhance Sci-Fi movies. 32. Therefore, when the sound field is present the beam is deflected and when it is absent the beam passes through undeviated. 33. The diagrams show the sound fields of an unfocused and a focusing ultrasonic transducer in water, plainly at differing energy levels. 34. The presence of a dipole sound field and a periodic force proportional to " U " 2 was confirmed by Powell. 35. This is an example of a whistle being driven in edge tone fashion but the result is a monopole sound field . 36. For this reason, microphones are often calibrated in more than one sound field , for example a pressure field and a free field. 37. Sound field audiometry may be more suitable when patients are unable to wear earphones, as the stimuli are usually presented by loudspeaker.38. By switching the sound field on and off very rapidly the deflected beam appears and disappears in response ( digital modulation ). 39. The change of diffusers are often used to create more reflecting surfaces and further encourage even distribution of any particular sound field . 40. Denon hits the $ 1, 000 mark with its AVR2500, which scored a bull's-eye in its evocation of a spacious sound field .
