Sound card for Home theatre

The BH would take 5 stereo 3.5mm 1 for L/R main, 1 for Centre and Sub(LF), 1 for Left Front/Right Front, 1 for Left Mid/RightMid and 1 for LeftRear/RightRear.

However, the only thing I know that can put out 10 channels of audio is a pro audio interface and I certainly don't know any movies out there delivering 9.1 audio.

Yours however claims to come with a USB connector as well as ethernet and Wi-Fi so you should be good to go without audio cables. Personally I would recommend them however. The convertors are bound to be substandard in a 9.1 home audio system as they expect you to have your own DAC at that price point.

See the interface tab under here http://www.lg.com/in/home-entertainment/lg-BH9530

Most certainly. There's a helluva lot of EM noise inside your case. The question is what price point would you be aiming at. Most people here will just suggest getting an Asus Xonar, but there are much better alternatives at similar and different price points.

Well the thing is to see an advantage you must send in analogue information. There is no actual way to improve audio quality from optical data because that streams data from the computer, not audio in analogue form. Your head unit for your 5.1 then does the digital to analogue conversion. If you have been doing this already with USB (which basically gets the same data and does the same process) then switching will not really help as the problem will either be bad conversion to analogue by your BH's head unit or a bad master clock (in your PC) which causes jitter which is like audio speeding up and slowing down on a very minute and fast scale and is the main reason that poor quality sound cards sound so poor. A bad master clock will be cured by an interface as they have thier own.

You're much better having it converted then sent to the BH through multiple audio cables.

If you want to do so you can use an 8 channel interface. The cheapest one I know of that will serve you brilliantly is the Focusrite Saffire Pro 24. You won't use the inputs (unless you wanna have and band recording session in your room) but it's going to be head and shoulders above what you have as far as quality is concerned. You will want dual 1/4" RCA male to single 3.5mm female cables or adapters to use this with your BH best. Oh, and if the BH has a single optical it won't be taking 5.1 data. Optical in any more than 2 channels is either TOSLINK or ADAT. An interface that supports toslink is usually a unit for recording and/or sound reinforcing large stage performances like arena systems (because they actually go up to 256 channels). An ADAT SPDIF capable interface however is around $500.

http://www.normans.co.uk/p-2030-focusrite-saffire-pro-24-audio-interface.aspx?CAWELAID=475625434&catargetid=720007940000010937&cadevice=c&cagpspn=pla&gclid=CL-35cmI6LoCFQ7LtAodWF8Ahw

If you want something a little less audiophile then Creative do a good Soundblaster surround Unit. I have used that before and it sounds pretty good.

http://www.maplin.co.uk/creative-sound-blaster-x-fi-surround-5.1-pro-usb-sound-card-506435?c=maplin&utm_source=gcs&utm_medium=gcs_search&utm_campaign=A09KJ&utm_content=External+Sound+Cards&_$ja=cgid:7690034683|tsid:49900|cid:119049523|lid:44978789203|nw:{network}|crid:26685291043|rnd:{random}|dvc:{device}|adp:{adposition}&gclid=CIutrJeJ6LoCFQ7LtAodWF8Ahw

EDIT: Sorry about the late post. I have got to sleep now and I know that my links are UK ones but I can't seem to get Google to give me US stores atm and I'm hella tired lol. I will update you in the morning but I put them up if you want to Google them yourself

How many rings are on these 2.5mm jacks. The conversion to 3.5 (or 1/4" with the Focusrite) isn't a problem, the channels per cable are. To properly take 7.1 signal your speakers need 4 channels per connector, so there should be three dark rings (leaving 4 exposed silver sections including the tip) on your 2.5mm plug. If not, let me know and I'll find some schematics because it will mean that your speakers take quadraphonic or 5.1 sound and submix it into 7.1.

You are at a major loss if you only have two RCA ports on the surround system, as that means it can only take stereo audio. RCA is one channel per connector, hence the old Composite video connectors being 3a RCA leads in red white and yellow. (Left Right and video).

After realising that the tw spec model and yours are basically identical (I could not find a picture of the back of a non-tw) I've double checked on the spec on their official website and it actually slyly confirms this (by putting LR next to the Audio connector checkbox)

As far as optical is concerned, you're stuck with compressed Dolby DTS as that's the 5.1 signal sent down a single connector. With decent speakers such as yours, you can probably hear compression artifacts long before clock jitter.

Have you tried using it in USB or LAN mode by any chance? Now I've dug into the unit a little it seems both analogue and optical are very compromised.