You said the square speaker do not know is built-in battery trolley speakers or external amplifier large size 2.0 stage speakers.
Home use is not recommended battery trolley speakers and stage speakers, trolley speakers are suitable for outdoor occasions that do not require a high level, stage speakers are suitable for large spaces, high power, noisy environment.
Home KTV/movie watching then there are three choices:
KTV-based home karaoke audio, 2.0 KTV speakers + amplifier, but you need to additionally match the sound source (disc player or jukebox), Pros: singing effect is good, the power is big; Cons: high cost, operation is cumbersome, the volume of a little big;
Speaker + amplifier, the retail price of the network 1000 or more, jukebox is more expensive.
To watch movies mainly with KTV function, home 5.1,,5.1 speakers + 5.1 amplifier, also need to additionally with the audio source, Pros: watching movies is very good, listening to songs is also good; Cons: Singing effect is general, cumbersome to connect, the volume is large.
Speaker + amplifier, the network retail price of 3K is about the same.
Compatible with the above features, the highest cost-effective is the home advanced combination of audio, generally with a sound source, amplifier, reverb and speakers, Advantages: more features, listening to songs with good sound quality, and do watch movies and home KTV; Disadvantages: less power.
A neighbor bought a gallows set with independent reverb sound good, you can search on TB, the whole set of one or two thousand ￥.
In the end to buy things need to look at the budget and the main purpose, buy when asked clearly:
What kind of sound source is needed
Is there an independent reverb
Power suitable for their own space