Highlights

  • Weight is efficiency in building acoustics and infrastructural measurements. With a weight of less then 3.8 Kg the Qohm sources are by far the lightest full performance source in the industry. A complete set of source, amplifier, tripod, laptop and microphones or level instruments can be carried on site by a single person.
  • After some optimization on the amplifiers, and extensive testing, the maximum sound power levels of the Qohm sources have been increased significantly over the entire frequency range, from 116 dB Lw to 121 dB Lw. This is possible because the high-tech 4 inch speakers in the Qohm both have stroke and power handling far in excess of normal speakers.
  • With more then 20 systems in the field for one or two years, we are proud to report that none of the Qohm nor Qam amplifiers in the field have shown any need for adjustment or repairs.
  • QamB, the battery supplied version of the Qam amplifier is out of development. Two options are available; a low power lead acid battery (5.4 Kg)  and a high power lithium battery (4.3 kg).  Both solutions will allow more then a full day of measurement activity. (or more then 30 minutes of continuous full power operation). The high power version will allow both mains operation and off-grid operation on the lithium battery. 

  • Also new from spring 2012 is the QomB source. This very cost effective sound source uses traditional speaker technology in a stable fibreglass housing, coming to an acceptable weight of 15 kg. A sound power level of 120 dB Lw is reached and this source satisfies all ISO standards.

  • McGill university in Montreal Canada is using a large set Qohm12 omni-directional sound sources. In this case the sound sources are not just for measurement, but also for the reproduction of music. The exceptional omni-directionality of the small Qohm12 sources is used to experiment with various sound field effects for music reproduction and room acoustics optimization. The set of 16 sources are suspended above the performance and recording site. The sources can create a well dispersed and spatial sound field. See all the dots in the two pictures above.
     

 

 

.