The specs on those speakers:
Technical Specifications: Speaker Unit: PowerMax™ Woofer: 5” Cone
PowerMax™ Tweeter: 1” Horn
Enclosure Type: Bass Reflex
Mounting: Threaded Inserts on both the top and sides of speaker cabinets allows for easy installation of 360° Universal Speaker Mounts (included).
Frequency Range: 65Hz - 40kHz
Nominal Impedance: 6 Ohms (Can be used with 4 or 8 ohm systems.)
Sensitivity: 88dB SPL (1 watt, 1 m)
Power Capacity: 160 watts (Maximum)
80 watts (RMS)
Crossover Frequency: 3.5kHz
Protection Circuit: Auto-Return Type
Connectors: Push Terminal
Dimensions: 241W x 170H x 145D (in mm)
Weight: 2.8 kg each
I would be very suspect of specs like these. 80 watts RMS with a 5" woofer? That's more like a "wiffer"! They claim the go to 65Hz, which I also doubt. Your best bet is buying used - a name brand. Bands are breaking up all the time and selling off.
Buying 4 or 5 of these is not going to make them sound any better, or bigger.
Bob