Apex has always been on the leading edge of creating innovative products. The combination of graphic and parametric equalisers in the PE-series was a world first. The SL-Series (Sound Leveller Series) offers unsurpassed features to all users who are concerned with level hearing protection. The Intelli-X 48 is a high end digital speaker management system, offering unprecedented ease of use. Combining graphic equaliser, shelving and notch filters as in the dBQ-Zero make it an easy to use but very powerful tool.