Trying to explain as much as i can

airoh69

airoh69

airoh69

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7 Jun 2017
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4
Hi,

I recently purchased an LG Blu ray Home Theater. I am not really satisfied with the woofer abilities so i want to change it. It happens that i have a self powered woofer from a logitech pc system. Is there a way i can connect that to the system and if there is a way how it will actually perform with the volume.
 
Unlikely, the lg sub is probably powered by the main unit, you dont want to connect your logi direct to that.
The lg probably doesn't have any audio outs, ( I've had 2 lg's)
You may be able to set tv to optical out then optical to rca and connect the logi that way, but it could end up rubbish 2 sets of remotes to control audio etc
 
Trying to add a better sub isn't feasible, these all in ones are cheap for a reason.
Try fiddling with the sound preset options.
And just replacing the main unit with an av isn't straight forward either, the lg speakers are likely to be 3ohm, so to need to replace everything.
 
Its not the power that i am not happy. Is the Hz the problem. Just looking something around the same power but to be able to go down the range of 28Hz
 
I wonder if it's possible to connect a better active subwoofer using the LG subwoofer speaker output?

Decent subwoofers are what is known as active, and have their own built in amplifier. Some also have speaker level input. This isn't used so the subwoofer is using an external amplifier (LG unit in this case); it's used just for listening to the signal and uses it's own amplifier.

The obscure 3 ohm rating out of the LG shouldn't matter, because it's not actually powering the subwoofer.
 
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hornetstinger said:
Budget? 28hz probably a good 10" sealed or ported box design. say BK XLS200
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*Yawn* - instead of jumping in an suggesting random stuff likely above budget, maybe read the OPs post. He has an LG home cinema in a box - it's unlikely you can just add a better sub, and between it being a "cheap" integrated system and the suggestion of adding an existing Logitech PC sub, suggests budget is slim.


OP:
Do you have the model number of the LG, so we can look at the spec and what connections are available.
 
Sorry Armageus, but you criticise hornetstinger for jumping in with his suggestion without reading the OP post, when it could be a feasible one. OP asked for a 28hz subwoofer and that's what hornetstinger posted. You're unlikely to get a lower budget one that does. Whether it's over the OP's budget remains to be seen.

The model of the LG in question has already been posted in the third reply. It's a LHB655.

It's got HDMI out and the 3 Ohm speaker connections. Only the 3 Ohm sub speaker out is of any use to connecting a subwoofer. Might be able to connect an active subwoofer using the method I've posted above.
 
Marsman said:
Sorry Armageus, but you criticise hornetstinger for jumping in with his suggestion without reading the OP post, when it could be a feasible one. OP asked for a 28hz subwoofer and that's what hornetstinger posted. You're unlikely to get a lower budget one that does. Whether it's over the OP's budget remains to be seen.
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Not going to discuss it in length, but there is a recent tendency for the same things get suggested by certain posters whether they meet the OPs requirements or budget (or not).

The 28Hz requirement just seemed an arbitrary requirement, especially following on from the suggestion of using some Logitech PC speakers, which were unlikely to have gone that low in the first place.

Marsman said:
The model of the LG in question has already been posted in the third reply. It's a LHB655.
Click to expand...
Apologies - missed that (and yes I realise the irony of criticising someone for not reading the OPs post first :) )

Marsman said:
It's got HDMI out and the 3 Ohm speaker connections. Only the 3 Ohm sub speaker out is of any use to connecting a subwoofer. Might be able to connect an active subwoofer using the method I've posted above.
Click to expand...

The Sub out looks to be completely non standard from what I can see
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Armageus said:
The Sub out looks to be completely non standard from what I can see
Click to expand...

Yeah. Pretty much all these type AV systems use this type of connection. Maybe they use this type of connection because of the odd 3 ohm rating, they do this to stop those who are less informed about audio, just connecting 4, 6, 8 ohm speakers to common spring or biding posts, resulting in damage being done.

Easy enough to get the LG's subwoofer cable, cut it and splice it to the cable from the replacing subwoofer.
 
Given we dont know what the internal crossover freq is for the lg, just using speaker level input with an active sub user risks losing a lot of mid range
 
i'd say just live with it OP. then in future buy a proper separates setup. no point trying to do a bodge job to an all in one system.

also adding a £300 sub to a cheap all in 1 system is ridiculous IMO
 
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