Originally Posted by penngray
lol, that can not be any more then a simple marketing statement!!
First, NOTHING can remove a room null except Sub placement. Also, I doubt the HK receiver remotely improved room resonances. Proper room treatments are the best option and Sub EQing devices like the Anti-mode 8033 will help.
Someone already posted that we can do .2 just using a Y-cable and that is all 7.2 is! Dont be fooled into spending more money on 7.2 AVRs and do not even bother worrying about 7.2 at all. Its a waste of discussion, time and money.
I have 4 subs in a room to all requiring a connections, my sub has one Sub out RCA connection but I easily wire them all up properly. Also, sub calibration should ALWAYS be done outside of any Pre/pro or AVR using the proper sub EQing products available and posted all the time in the DIY sub or Subwoofer forums.
The subwoofer outputs (2) for the AVR 745 are different
not the same
output signal as one gets if they parallel all the subwoofer inputs with a single AVR subwoofer output..
As Sanjay mentioned...
Harman International has a corporate R & D team that does continual development for certain DSP areas such as Room EQ and multi-channel Matrix
decoding. Next these IPs appear in various hardware and systems marketed under certain Harman brands, these include OE car audio systems in Mercedes, BMW, Lexus, Land Rover, Chrysler. Also certain higher end audio components branded Mark Levinson & Lexicon, all owned by Harman International as well as AVRs branded Harman/Kardon. Pretty simple to understand, once the R&D is done and final algorithms are validated these show up in various Harman branded components and systems.
Now back to the main
feature of multiple subwoofers..
The R&D team under Dr.Toole, Dr.Olive and others..
Developed some incredible findings about using multiple subwoofers, check out the AES preprints and one will find alot of substantiation for this subject.
The Room EQ software within the AVR 745 was developed by the Harman R&D team. And it was explained to me that for each subwoofer, the AVR does a independent low frequency sweep from the listener's position. Then the DSP and its S/W calculates a unique independent output signal (transfer function) for each
subwoofer independently. The basic idea is to correct for audible low frequency issues as heard while in the listener's position.
Also the S/W is designed to pull down peaks rather than boost the EQ to fill holes as to save DSP headroom. Since every room has its own unique layout, size, furnishings, construction materials plus the physical positioning of each loudspeaker and subwoofer will vary. This is why there is such as a significant audible differences between every listening room, studio or auditorium even when using the same
electronics and loudspeakers..
If you want more info you better contact HK.
Just my $0.045...