[#item_full_content]AGAWAM, Mass.–(BUSINESS WIRE)–The Stephens Group, LLC (“Stephens Group”) announced today that KPS Capital Partners, LP (“KPS”) has signed a definitive agreement to acquire its portfolio company Catalyst Acoustics Group (“Catalyst”). Catalyst is the parent company of an elite group of acoustic, seismic, vibration and noise control companies including Fräsch, IAC Acoustics, Kinetics Noise Control, Lamvin, Madrid, Noise Barriers, RealAcoustix, Sound Seal and independent testing laboratory Riverb