http://lowendmac.com/2001/harmankardon-compatibility-guide/2001 – Apple’s desktop computers began to include Harman/Kardon speakers in October 1999
trying to find a document that lists all the computers compatible with the apple pro speakers!
https://eshop.macsales.com/Descriptions/aplm8756ga.htmlMacintosh Models Compatible with digital "Pro Speakers" by harmon + kardon
compatible with 17+ different macintosh models
Apple Power Mac G4 "Digital Audio"Available in G4/466MHz, G4/533MHz, G4/733MHz, or Dual G4/533MHz speeds
http://www.everymac.com/systems/apple/powermac_g4/specs/powermac_g4_466.htmlhttp://www.everymac.com/systems/apple/powermac_g4/specs/powermac_g4_533.htmlhttp://www.everymac.com/systems/apple/powermac_g4/specs/powermac_g4_733_qs.htmlApple Power Mac G4 "QuickSilver"Available in G4/733MHz, G4/867MHz, or Dual G4/800MHz speeds
http://www.everymac.com/systems/apple/powermac_g4/specs/powermac_g4_733_qs.htmlhttp://www.everymac.com/systems/apple/powermac_g4/specs/powermac_g4_867_qs.htmlhttp://www.everymac.com/systems/apple/powermac_g4/specs/powermac_g4_800_dp_qs.htmlApple Power Mac G4 "QuickSilver 2002"Available in G4/800MHz, G4/933MHz, or Dual G4/1GHz speeds
http://www.everymac.com/systems/apple/powermac_g4/specs/powermac_g4_800_qs.htmlhttp://www.everymac.com/systems/apple/powermac_g4/specs/powermac_g4_933_qs.htmlhttp://www.everymac.com/systems/apple/powermac_g4/specs/powermac_g4_1ghz_dp_qs.htmlApple Power Mac G4 "Mirrored Drive Doors"Available in Dual G4/867MHz, Dual G4/1GHz, or Dual G4/1.25GHz speeds (and single 1.25ghz speed)
http://www.everymac.com/systems/apple/powermac_g4/specs/powermac_g4_867_dp_mdd.htmlhttp://www.everymac.com/systems/apple/powermac_g4/specs/powermac_g4_1.0_dp_mdd.htmlhttp://www.everymac.com/systems/apple/powermac_g4/specs/powermac_g4_1.25_dp_mdd.htmlhttp://www.everymac.com/systems/apple/powermac_g4/specs/powermac_g4_1.25_mdd.htmlApple iMac G4 "15" Flat Panel"Available in G4/700MHz, G4/800MHz speeds
http://www.everymac.com/systems/apple/imac/specs/imac_700_fp.htmlhttp://www.everymac.com/systems/apple/imac/specs/imac_800_fp.htmlApple iMac G4 "17" Flat Panel"Available in G4/700MHz, G4/800MHz speeds
http://www.everymac.com/systems/apple/imac/specs/imac_1.25_17_fp.htmlhttp://www.everymac.com/systems/apple/imac/specs/imac_800_17_fp.html