Question Add 2 more speakers to a 2.1 system

[FinleyOderSo]

I've got this 2.1 sound system:
https://www.amazon.de/dp/B000BKSFJ2/ref=twister_B013XZLQQU?_encoding=UTF8&psc=1
As you can see in the pictures there are no ports where I can just add more speakers.
Also I don't want a real 4.1 system. I just want speakers behind me that get the same signal as the front ones.
So that the right one and the rear right one get the same signal. Same for left.
Is it possible to just split the R and L signals with 2 cinch Y adapters and feed them into 4 speakers.
Or will there be a problem because of not enough power for 4 speakers (The 2.1 system says it has 50Watts)?
Or is this a completely wrong way and can anyone tell me how to accomplish this?

 

[jsmithepa]

Assuming the R+L speakers are passive (have no power cords), yes you can hook up second speakers in series:

AMP OUT(+) ----> (+)SPKR1)(-) ---->(+)SPKR2(-) ---->(-)AMP OUT.

U achieve this by any combination of adapters and/or custom cabling.

U will not get stronger sound of course, but u do achieve some surround effect.

 

[FinleyOderSo]

Thanks.
Can I also hook them up in parallel?
AMP OUT(+) ----> (+)SPKR1)(-) ----> (-)AMP OUT.
AMP OUT(+) ----> (+)SPKR2)(-) ----> (-) AMP OUT.

 

[jsmithepa]

Thanks.
Can I also hook them up in parallel?
AMP OUT(+) ----> (+)SPKR1)(-) ----> (-)AMP OUT.
AMP OUT(+) ----> (+)SPKR2)(-) ----> (-) AMP OUT.

Parallel hookup only works if AMP can handle the HALFed ohm-age