TVs & Home Theaters forum

General discussion

5.1, 7.1, 9.1 any difference?

by lesthebest / January 9, 2010 5:58 PM PST

Hi Guys,
I am planning to change my 10 yr old 5.1 system. Obviously, I want to upgrade to the latest which is 9.1 sys. But the dealer advised against it insisting that 5.1 is good enough. He claimed that there is hardly any disc that is recorded in 7.1 or 9.1 format. Any of you guys have experience with this ? I am planning to buy denon 4810 that has pro logic llz.Also , how important are the side speakers versus the height speakers?

Discussion is locked
You are posting a reply to: 5.1, 7.1, 9.1 any difference?
The posting of advertisements, profanity, or personal attacks is prohibited. Please refer to our CNET Forums policies for details. All submitted content is subject to our Terms of Use.
Track this discussion and email me when there are updates

If you're asking for technical help, please be sure to include all your system info, including operating system, model number, and any other specifics related to the problem. Also please exercise your best judgment when posting in the forums--revealing personal information such as your e-mail address, telephone number, and address is not recommended.

You are reporting the following post: 5.1, 7.1, 9.1 any difference?
This post has been flagged and will be reviewed by our staff. Thank you for helping us maintain CNET's great community.
Sorry, there was a problem flagging this post. Please try again now or at a later time.
If you believe this post is offensive or violates the CNET Forums' Usage policies, you can report it below (this will not automatically remove the post). Once reported, our moderators will be notified and the post will be reviewed.
Collapse -
9.1 systems use matrixed sound
by minimalist / January 9, 2010 11:45 PM PST

(in other words they make up the channel content for those height speakers). Dolby Pro-Logic IIz is really just a fancy new version of Dolby Pro Logic II, DTS Neo 6, and DPLIIx. All of them are making up information on the fly for 5.1 and 7.1 setups. Sometimes they produce interesting results. Most of the time I find them to be a waste of time.

However, real, discreet 7.1 content is a different story. Some Dolby TrueHD and DTS-HD MA soundtracks on Blu-ray discs (about 1 out of every 7 or 8 discs in my experience) have 7.1 audio. And some DVD's that have DD-EX have those 8 discreet channels too. There is enough content out there for these systems to warrant a 7.1 system in my opinion. And unlike with the Pro Logic system, its all presented exactly the way the filmmaker and audio engineer intended.

If you have the room to set up a 7.1 system I say go for it. Skip the PLII-z nonsense and just focus on getting a quality 7.1 system. Like many others, I'm stuck with 5.1 because my living room is just too small and my couch is against a wall. So there's no room for those rear speakers.

Collapse -
7.1 system
by lesthebest / January 10, 2010 9:24 AM PST

Hi, My couch too is against the wall. Can I position the speakers at the side of the couch pointing inwards to get the 7.1 effect? Thanks

Collapse -
No, cause that's where the 5.1 speakers go.
by minimalist / January 10, 2010 9:56 AM PST
In reply to: 7.1 system

5.1 and 7.1 speaker setup guides:

The fact that the majority of the mainstream audience has smaller living spaces is probably going to dictate that 5.1 is the surround standard for a long time. Even with Dolby TrueHD and DTS-HD supporting 7.1 by default, only about 10 or 12% of blu-ray releases actually have 7.1 surround. Most are still using 5.1.

Popular Forums
Computer Newbies 10,686 discussions
Computer Help 54,365 discussions
Laptops 21,181 discussions
Networking & Wireless 16,313 discussions
Phones 17,137 discussions
Security 31,287 discussions
TVs & Home Theaters 22,101 discussions
Windows 7 8,164 discussions
Windows 10 2,657 discussions


Turn up the volume with our Apple Byte sweeps!

Two lucky winners will take home the coveted smart speaker that lets Siri help you around your connected house. This sweepstake ends Feb. 25, 2018.