Combine 3 speakers to one amplifier

I saw a question in my Youtube video about how to combine speakers for one amplifier unit without making any damage to an amplifier. 

An speaker impedance must be match or higher than an amplifier manufacturer specification, if you use lower speaker impedance than an amplifier specification, your amplifier may end up damaged or make a fire when you play loud music.

Commercial amplifier can handle between 4 - 16 ohms speaker impedance and maybe lower to 2 ohms for car sub woofer amplifier. but in a question he asked me how to combine 3 speakers @ 6 ohms load to one amplifier.

The simple solution is make 3 separate amplifiers and share same input, but it makes circuit more complicate and use many electronic components. However, if connect all 3 speakers in series, it will make impedance equal to 18 ohms and it make an amplifier output drop so much.

So, I use 2 speaker connect in parallel and series to other speakers like an image below

SP 1 and SP 2 impedance drop to 3 ohms because two 6 ohms speakers parallel 
When series the two speakers with SP 3, the speakers impedance equal to 9 ohms and that suitable to an commercial amplifier in the market.

Remember: When you series speakers the impedance increase = SP1  + SP2
When you parallel speakers, the speakers impedance decrease = SP1 - SP2

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