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garethb

5 centres in 5.1 setup

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Hi, I'm fairly new to home theatre, only really started a few months back. Only ever had HTIB setups previously as I lived in units, but have moved into a house this last year and wanting to get a decent setup.

The first speaker I was able to get was a Aaron cc120. Long story short, got it off a mate for a case of beer after he upgraded. At this point, my little pioneers were being outclassed by the centre and while on gumtree I saw another cc120 going cheap. I had a read a few times that matching LCR is the way to go so I went for it and started looking for a third which I was able to get. Now I have 3 of these for my LCR channels. 2 vertical, the centre horizontal. 

I was in the process  of looking for some bookshelves to put as the surrounds but in my searching, I noticed 2 cc120's on an auction site and looks like I can get them at an absolute steal! 

So, would 5 of these speakers (the rears vertical as well) work in 5.1 setup? I really do like the sound of these speakers but I have also read MTM (mid-tweeter-mid) style speakers aren't well suited for surrounds. Would I better leaving these and getting bookshelves even though its an almost too good a price to pass up? Would the benefits of timbre matching outweigh the downsides of MTM surrounds?

I my lounge, the fronts are around 3.8m from the main seat, and the rears will be around the same.

Edited by garethb83

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I think the 'same speakers, you like the sound and  the right price ' would out way any negative reasons. Would you have the L and R at the same height from the floor as the rears?

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they will be slightly higher, at the back of the room angled down slightly to pass just over head high at the listening position. I don't have much choice really, best I could get away with with the bosses permission. Would that have any major impact not being on the same level?

Edited by garethb83

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2 hours ago, garethb said:

they will be slightly higher, at the back of the room angled down slightly to pass just over head high at the listening position. I don't have much choice really, best I could get away with with the bosses permission. Would that have any major impact not being on the same level?

Gareth ;sounds ok ; one reason the surrounds should be aimed just above head height is for ambience and directionality ie a plane going overhead or an object panning from the front to the rear .The reason most center channels are a tweeter between too midranges [ called a d'appolito array ] is to give a point source effect ; exactly whats needed for dialogue and why a good cc like the aaron will have horizontal dispersion characteristics suited to horizontal mounting ..

This doesn't mean you can just flip one on its side ; but if price is a factor and their timbre matched by brand anything is better than htib speakers :) Some like monopole speakers [like 2 ways] for the surrounds as pinpointing sounds appeals ; others like bipoles which give some direct as well as non localisable ambience and very rarely some like dipoles which are all about ambience  

If you could mount them within these vvv off axis parameters the horizontal dispersion should gel ok the closer you get to 0 degrees I feel ?:)

http://www.dolby.com/us/en/guide/surround-sound-speaker-setup/5-1-setup.html

 

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So the surrounds in a 5.1 setup should be at 90deg to the seats? Didn't know that and that has just made my job easier. I thought they should be behind.

I thought Mr Aaron would know better than me and wondered if I should keep them all horizontal, but one article I read on Audioholics convinced me that vertical is best even for expensive centres http://www.audioholics.com/loudspeaker-design/vertical-vs-horizontal-speaker-designs

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18 hours ago, garethb said:

So the surrounds in a 5.1 setup should be at 90deg to the seats? Didn't know that and that has just made my job easier. I thought they should be behind.

I thought Mr Aaron would know better than me and wondered if I should keep them all horizontal, but one article I read on Audioholics convinced me that vertical is best even for expensive centres http://www.audioholics.com/loudspeaker-design/vertical-vs-horizontal-speaker-designs

If 5.1 I'd place slightly behind the seats but to the side, maybe at 30deg tops

If setting up to have 7.1 at some stage id place beside the seats at 90deg and you add the rears behind the seats down the road somewhere

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19 hours ago, garethb said:

So the surrounds in a 5.1 setup should be at 90deg to the seats? Didn't know that and that has just made my job easier. I thought they should be behind.

I thought Mr Aaron would know better than me and wondered if I should keep them all horizontal, but one article I read on Audioholics convinced me that vertical is best even for expensive centres http://www.audioholics.com/loudspeaker-design/vertical-vs-horizontal-speaker-designs

It depends on the off axis directivity of the tweeter as audioholics says Gareth

Quote

we have improved the smoothness of the speaker’s off-axis response a great deal. In the midrange drivers’ frequencies, the standard deviation improved to 1.19.

;that's with a high directivity horn tweeter and you have a dome one ; also off axis response with vertical orientation isn't as important for surrounds as it would be for center channel usage . Experiment as its a compromise  ;   as they say best of all is a proper 2 way to  avoid combing effects ; the much smoother frequency response shows how much

http://www.audioholics.com/loudspeaker-design/vertical-vs-horizontal-speaker-designs/150-vertical-chart3.jpg/image_view_fullscreen

Quote

One solution is to completely avoid their center channel and use a bookshelf speaker

 

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