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Old 29th August 2008, 05:05 AM   #1
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Default Dolby 7.1

Hi

Is anyone here using Dolby 7.1, with 2 rear mono channels:

- in practise is it much (any?) better than 5.1 or 6.1, etc,

- are the quality or matching of the rear speakers that important?

Thanks
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Old 29th August 2008, 07:03 AM   #2
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with 7.1, should the side speakers be (directly) to the side of the main listening seats?

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Old 29th August 2008, 08:35 AM   #3
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Have you actually found a disc with 6.1 or 7.1 on then?
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Old 29th August 2008, 08:38 AM   #4
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There's a lot around with 6.1 but have never seen a 7.1 on a DVD. Doesn't it just make it up from the data on standard DVDs? Blueray has 7.1 capabilities I think.

In the end, gave 6.1 the flick and back to 4.1.
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Old 29th August 2008, 09:53 AM   #5
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> Have you actually found a disc with 6.1 or 7.1 on then?

No, I just bought a 2nd hand 7.1 receiver. Not chosen for its 7.1, but for its Audyssey MultEQ. http://www.audyssey.com/technology/index.html

But as it has a 7 amp channels, I thought *if itís "useful" - Iíd hook up some rears

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Old 29th August 2008, 11:57 AM   #6
rabbitz is offline rabbitz  Australia
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Top Gun and the later Titanic are both DTS 6.1 and there are others here which I can't remember. AFAIK, 7.1 is the same as 6.1 but with 2 mono rear channels instead of 1 (see the pic).

You also find a lot that show 5.1 on the liner notes but are EX such as The Corpse Bride. These have the EX flag that automatically activates the EX decoding in the AV receiver or amp. You'd be surprised at how many there are and you don't know until you pop in the DVD and when the movie starts, it shows EX or ES and the centre rear icon is activated. I believe it's not discrete like 6.1 but close enough.

With Blue Ray which can do Dollby TrueHD, DTS-HD master etc, there will be a lot of 7.1 but the AV amp will need to have the decoder to suit.

It's getting nuts and anyone for 24.4 and beyond?
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Old 29th August 2008, 01:03 PM   #7
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It is indeed a sad way the marketing is taking technology. Anything more than 5.1 is just unecessary in normal people's homes. In fact you can easily get away with 4.1 really.
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Old 29th August 2008, 03:24 PM   #8
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Rabbitz,

I recall you have a HT setup, especially thoughtful in the rears, but not exactly what . .
Do you have a web link?

(Due to SAF and door location I canít accommodate a centre, which is no problem.
Iíll use high clarity three ways and a phantom centre).

So (apart from the 0.1 LFE) it could be:
Front L R
Side L R
Rear: either one or two
ie 5.1 or 6.1

Or
Front L R
Back L R
ie, a different sort of 4.1

Which is better with Ďmost formatsí?

Thanks
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Old 29th August 2008, 03:32 PM   #9
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I've read that the new HD audio formats, PCM, TrueHD and DTS HD MA are 7.1 . .
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Old 29th August 2008, 03:36 PM   #10
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Yep.... 4.1 is what I went back to and I found it tonally better and better clarity (and dialogue) as I view on axis with LR front next to the screen. Side benefit.... more room for my stereo gear.

Binned both centre speakers which used the same mid-woofers as the rest so tonally they should have been OK. Tweeters were different, SEAS 27TTFC vs Vifa D25NC but the difference would be moot. I think the difficulty is to get the positioning right for the LCR (same plane, heights etc) and that's impossible in most viewing areas.... well it was here if I wanted to see the screen.

There's an interesting little note on centres and 4.1 in this marketing blurb but it lines up with my experiences. The moral is, if you can't do the centre exactly right, don't do it at all. Of course a lot will disagree but that's life.

http://www.zuaudio.com/loudspeakers/druid-center.html

.... back to the original topic.... what was it again?
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