Various analog, digital and surround sound meters were demonstrated. The analog meters that were demonstrated were the 40 series, 12 series and 20 series. The digital meters that were demonstrated were the 12 and 40 AES series. The surround meter SUR 5.1 340-B6 was also demonstrated. Features of these loudness meters were discussed such as peak hold, phase correlation and addition/subtraction of input signal.
