Driving a sound bar

My TV has a sound bar.

It is connected by an optical cable.

The TV itelf is connected to an ethernet switch, an HDMI cable and by coax to TV aerial distribution amplifier.

I have a computer (configured as a home theater PC (HTPC), currently mothballed, that I intend to restore as a MythTV server. It will also be connected to the TV distribution amplifier, the ethernet switch and the other end of the HDMI cable.

The HTPC and the TV/Soundbar are on opposie sides of the room.

When set up in my previous home, the sound came through a PC sound system connected from the HTPC.

I am hoping to drive the sound from the HTPC through to the sound bar.

Is there any reason that this might not be possible? :(

TIA

Reply to
pinnerite
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Normally, you would look on the Sound Bar manufacturer site, for hookup diagrams.

If a device has HDMI-In and HDMI-Out, then you can route to the Sound Bar first, then run the HDMI-Out to the TV set.

They give some examples of testing, here.

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Paul

Reply to
Paul

It should be possible... it will depend on what connections the sound bar supports and if the TV can do ARC (audio return channel) on one of its HDMI inputs?

If it can do ARC then you can connect the sound bar to the ARC capable HDMI on the TV, and the HTPC to the TV via another HDMI. The TV will then feed the audio for whatever it is showing at the moment to the sound bar. So you should be able to hear audio from broadcast programming decoded by the TV, from content sent from the PC and from stuff streamed directly by the TV.

Reply to
John Rumm

You should be OK provided there is only one earth connection (through a

13A plug) on the system, else you may get a hum loop.
Reply to
Woody

Have you checked that the TV passes audio from the HDMI inputs to the optical output and in a format that suits the soundbar?

Reply to
Unsteadyken

Works for me. My TV passes over incoming HDMI PC audio to its optical output, and the attached Dolby Digital receiver then decodes the correct multichannel outputs, if the source file or application has output already encoded as such. Otherwise, normal PCM stereo.

Reply to
Adrian Caspersz

Around 1975, when was designing sound equipment, we solved that one by earthing the kit to the chassis via a small resistor. That was enough to keep the frame as a screen, but not enough to allow large earth currents to pass, For 0.5p it solves hum loops entirely

Reply to
The Natural Philosopher

People make things so complicated these days. A simple audio cable is sufficient. Even a headphone output will do. Some sound bars use Bluetooth even though the bar is inches from the TV, and introduce delays in the sound leading to loss of lip-sync.

Reply to
Max Demian

The connection method affects the channel configuration you can do.

A TOSLink is stereo or AC3 5.1, or can be quad (at reduced quality). And I've never run into someone with a working quad option (as proof there really is a quad option). There may not be enough bandwidth in the bitstream for a more-fancy format.

The TOSLink in stereo mode, should be every bit as good as analog stereo, and with the optical path, there's no ground loop.

"TOSLINK cables are usually limited to 5 meters in length, with a technical maximum of 10 meters"

And that's because the transmitter and receiver, have low material cost. They do the link, the way a hobbyist would create a link. One benefit of the choice of visible red light, is it's easier to check "it's working".

Paul

Reply to
Paul

Unlikely with digital audio...

Reply to
John Rumm

Sounds unnecessarily complicated. My current (Sony 32") TV has a single

3.5mm jack socket that can be configured as a headphone or line output. Then all I need is a 3.5mm to twin phono cable.
Reply to
Max Demian

If you run an analog line level signal (~1VRMS) over a long enough distance, you will be able to hear some hum in the background. There will eventually be a quality issue.

I don't usually see reports of TOSLink issues. In the sense of optical failures. I don't know if anyone makes custom receiver chips for TOSLink purposes or not. It's just a LED and a photodiode or phototransistor running at 6MHz or so.

The advantage of TOSLink, is no electrical grounds are involved. It's as bulletproof as Ethernet.

Paul

Reply to
Paul

Confirm my Soundbar has that ..... HDMIin and HDMIout as well as optical out

Reply to
Sargan

Mine is a Kubik One.

Only micro usb in, two optical in, L & R RCA out; and Sub out whatever that is. looks like RCA).)

:(

Alan

Reply to
pinnerite

Does the product line include a sub to go with it ?

Here is a short discussion about the sub option.

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This is an example of a bottom-firing sub. 150W. You can set the cutoff frequency, so the bottom end of the Kubic meshes with the top end of the sub.

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It's a box the cat can sleep on top of.

The problem with subs, where the amp is integral to the speaker cabinet, is the amp runs hot because there's no cooling for it. This one could be Class-D though, so it won't be as inefficient as older amps. The capacitors inside units like this, are glued to one another, so the vibration from the sub, doesn't snap the legs off the caps. One of the failure modes, is the glue is actually conductive, and if it comes in contact with conductors inside the design, it can short stuff. (The glue ages when it is heated.)

But because these things are a "furniture design", I don't expect anyone to turn back the clock and package the bits separately.

Creative had some nice 7.1 systems, where the electronics inside would fail because of the poor glue selection. That, and the heat. The design in that case, used 10 Class-D amps, three of the Class-D amps fed the sub, the sub had three voice coils on it, and the voice coils would add the signals together. And that's how the sub in that case, got a 150W rating, as 3x50W input.

If you're into rap, some compositions have lots of bass, for the specific purpose of giving your sub a reason for existing :-)

A friend at work, had stereo subs. Because he refused to believe you could not "locate" the sound in the sound field. I can tell you the walls in the townhouse had foil backed board in them, because of the noise the foil made when the subs were active. The subs had 36" cones. They're the biggest speakers I've ever seen in someones house. You put bags of sand inside the cabinets, to keep the sub "on the floor" :-) Too funny. The townhouse is in a row of townhouses, and I can't imagine what the neighbours think during a "stereo test run". The wife of course, is very happy with these "things" in her living room. A whole family of cats could sleep on the top of them. These were front-firing subs, because to do a bottom firing sub would take up too much floor space. That's how the speaker cabinets had room for the bags of sand in the bottom of them.

So that's a taste of the "mystique" of subwoofers. It completely slipped my mind, to buy one of those.

Paul

Reply to
Paul

My amplifier doesn't have an optical output. I don't have a problem with wired connections up to 3m or so, apart from the magnetic PU of the turntable which needs to be as short as possible (it came with its own lead and doesn't like extensions).

Reply to
Max Demian

Yeah I meant "input" not "output".

Reply to
Max Demian

It's practically useless for modern multichannel audio, does not support uncompressed - HDMI surpasses that capability.

The only reason for connecting optical to a TV is where your equipment doesn't support ARC over HDMI (or doesn't support HDMI itself).

Ethernet is electrically isolated by transformers on the PCB. Coaxial SPDIF is meant to be isolated as well, but manufacturers often cheap out.

Mistakes aside, if ye stop the average bod in the high street, the words input and output are interchangeable and not wholly understood.

They don't find problems with entry and exit at the supermarket.

Reply to
Adrian Caspersz

Do turntables have optical outputs? And why is the whole caboodle called a turntable so you have to say "platter" for the bit that goes round?

And why aren't the preamps of both the turntable and amplifier switchable so you can plug anything into anything?

I think there's something funny about airports, especially the foreign language terms for entry and exit. Does exit mean the exit to the plane, or to the countryside?

Reply to
Max Demian

Nope, thats the gate.

To outside the terminal.

Reply to
Rod Speed

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