qspeakers 1.3.0-1build1 (s390x binary) in ubuntu focal

 QSpeakers is a simple graphical program that
 simulates common acoustical enclosures behaviour
 to help designing loudspeaker systems, based on
 the loudspeaker driver's Thiele / Small parameters
 and the chosen enclosure type.
 .
 This software is mostly useful for do-it-yourself
 loudspeaker enthusiasts, acoustics teaching, and
 to a lesser extent, for loudspeaker engineering.