In the field of acoustic measurement technology, a wide frequency range and high sound pressure levels are of great importance. The SPEKTRA development team is currently working on a new pressure chamber calibrator for ½" microphones and similar devices such as sound level meters. Building on the success of its predecessor, the SQ-4.2, this optimized and completely redesigned acoustic coupler will have many advanced features - tailored to the ever-evolving needs of professionals in the field.