Setting up a low freq. emitter X4 where there was LFE X1
My question is about lack of power, where to connect the transformer and how much voltage?

The old LFE had enough power from amp. through 3,5mm. This thing does not get enough from 3.5mm.
Made a picture to describe my problem in detail.
It does work without additional transformer but is weak.
So I'm currently figuring out where to attach additional 12 volts or something..

But I'm no electrical engineer so I ask here first, before the LFE burns to crisp.

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Can you post some real information and any specifications about your LFE device?

4x speaker interconnected like in picture, plugged into amplifier by 3,5mm jack. Not much else in there.
Center channel's always disconnected, LFE single channel works fine for 1 speaker (40W) in that setup.
However, if I switch LFE/Center channels; it's way too loud but has no bass at all, just high tones.
So I just discarded the (Center/yellow) line.

Recently, I've added 3 more speakers, so the amp is too weak for that. I'm trying to avoid getting a new amp.

Just wanted to ask where to patch an additional power transformer, and how much power would 4x40W setup require.
The one I've tried was weak, and I just linked ++ and -- no grounding, which then produced an ugly buzzing sound.

If not possible to patch, I'll probably look for some used/cheap amp.

It's a bit more complicated.

We need the make and model of your amplifier. Do you know the output impedence per channel? What is the impedance of your speakers?

How is this related to linux?

AC-230V 50Hz, 0.08A(18.4W) Made in China.

It's just an internal part of some used amp TBH, it's been here for years, no idea where the original box is at.
I'm gonna look for some used home theater system again soon, to get a more capable transformer.

No idea, I'm just poking at it for fun. Home PC and all that.
I do realize the amp can't provide enough power, I'm just wondering if it's possible to power 3 more speakers externally.

It's hardware or w/e, connected to realtek HDA, slackware-15.0, linux-5.15.x ..

I might be a bit dense but I need a better picture of your setup.
I do not understand exactly what you mean by a lfe. I thought it was some kind of external amplifier and the audio output of the PC was plugged into this amplifier. Increasing the supply current will not change the audio output.

The Realtek HDA is just a driver for the analog audio output of your computer. The 3.5mm jack from the output is typically a 3 pole stereo output or now days a 4 pole that includes the input for the microphone. Normally its suitable for just a headphone. Your PC might also have an audio line output.

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Ok, I can do another quick schematic to make it more clear.

I don't know, LFE = Low Freq. Emmitter. It can have internal amp, or sometimes behind center speaker dashboard.
I've seen variations, anyway I just want the bass far away from the desk, but I still want the off button and volume on my desk.
So I have the amp on the desk, with those buttons. And Front with buttons and input/output.

Realtek HDA, well can't say I like how it may or may not switch any output to input.
So, nothing too good to say about it, except it works as much as expected from integrated chip.
Kernel driver is Generic (Intel) HDA and not Realtek though, lspci says AMD and board spec says realtek.

Probably going to replace that thing, if I can find a 6ch VIA chip somewhere.

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I get it now (well sort of)...

LFE - Low Frequency Effects. So LFE is the bass shakers. Posting from behind the dashboard and from the latest picture I would of thought you might be talking about just a subwoofer channel.

LFE or even the subwoofer channel requires lots of power. Again without knowing the specifications i.e channel impedance of both the amp and speakers, I can't say much except that what you want to do with your existing setup will probably not work. You might get away with 2 speakers but you can't add more current to get more output.

Not going to mark this solved yet, but I found out what was wrong.

Thought about what you said about the jack that was only suitable for headphones.
Then it occurred to me the black cable is way too thin for 4 speakers which can pull like 100W.
So I spliced another fat (shielded) cable, extended it with telephone cable, and replaced the old one.
Did this hackery because I was too lazy to go out and buy a long fat cable. It fixed the LFE output.

After the 2x bass was fine, I went to add 2x more bass + 4x 10Ws. Then it was lacking power.
So I've mixed an old USB2.0 hub into it, which gave me additional 12V for the rear 6x speakers.
It all routes now through the hub, works great when everything is connected.
Only fails when the back channel is disconnected, but I think that's something to do with HDA.
Just assuming here it tries to remap the jacks when one of them is unplugged, not sure.
Possible also that the unplugging breaks the power circuit, but whatever.
I'd be best to go buy proper cables, then I'll look into it again.

If you are dealing with audio, high power speakers likely draw/demand more power than a pc is capable of providing. The output of the PC should go into the audio input of an external amplifier and that amplifier should be rated for the power output needed to drive the speakers.

Using a low power amp to drive high power speakers will quickly burn out the amp, and will always result in distorted audio.

Well thanks for pointing this out, but the route's already described in 2nd picture.. Maybe you've missed that.

Don't worry about it, I'll let you know if/when it burns out.
It's not an expensive amp or an expensive hub, and it's all external so PC will be fine.
My main concern are the speakers, and they could easily take double that output.
They will not burst from insufficient power, only when there is too much.