AVS Special Member
Join Date: Mar 2003
Location: Joshua Tree, CA
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Check the 325, U will find it only has Dolby Pro Logic II... 😉
However, the 325/525 were the 1st HK AVRs with Logic 7 7.1 Music & Cinema modes.
Here is a lift directly from the Dolby Pro Logic IIx marketing paper.
• Dolby Pro Logic IIx is ideally suited for the early adopter home A/V enthusiast upgrading
their 5.1-channel or Dolby Digital EX home theater to 7.1-channel status. It also provides a Dolby solution for home theater enthusiasts who have already invested in a system with 7.1- channel capability.
• Dolby Pro Logic IIx is the ideal choice for the discerning listener of multichannel music
who demands a seamless, enveloping listening experience and the most versatility from their
7.1-channel surround sound system."
• Dolby Pro Logic IIx is the ideal technology for the home theater enthusiast who demands the highest degree of surround sound ambience and quality from their surround sound system. Dolby Pro Logic IIx processes stereo and 5.1-channel sources for playback in a dramatic 7.1-channel environment characterized by a seamless, enveloping surround sound experience.
• Music lovers seeking a highly dramatic and natural sounding multichannel listening experience from compact discs, cassettes, MP3s, and high-quality FM stereo broadcasts will appreciate the highly sophisticated decoding and steering technology of Dolby Pro Logic
IIx. When used in a 7.1-channel environment, Dolby Pro Logic IIx provides a seamless, enveloping surround sound listening experience.
• Video game enthusiasts will appreciate the engaging spatial effects and imaging provided by the Pro Logic IIx decoding algorithm as well as the low-frequency background ambience provided during playback of video game content
• Home entertainment enthusiasts seeking highly advanced 7.1-channel playback technology developed by the most recognized and trusted name in surround audio
Though it was 10 years ago, I recall the performance of DPLIIx was far superior to DPLII. But its main target was to support EX 6.1 which was really pushed by THX, and Dolby wanted to take it a step higher to 7.1. HK never really supported 6.1 as the center surround speaker was a bad idea greatly reducing surround channel separation so HK went right to 7.1 both for Logic 7.1 (developed by Lexicon) and to get the (2) additional amplifiers for Zone II operation.
Just my $0.02... 👍😉