he Realistic Minimus-25 speakers are 2-way, bookshelf speakers with 40-watt max input, 8-ohm impedance, and a walnut veneer finish. They feature a 4.5" mid/woofer with a rubber surround and a tweeter marked for 10 watts with a 2kHz to 18kHz range, though the actual driver specs may vary. The speakers are housed in a sealed box design and were custom-manufactured in Korea for RadioShack.  

Detailed Specifications
Type: 2-way, sealed box, bookshelf loudspeaker 
Power Handling: 40W max input (some sources say 10W) 
Impedance: 8 Ohms 
Drivers:
Woofer: 4.5" mid/woofer with a rubber surround 
Tweeter: 1" tweeter (some sources indicate it's a 10W driver) 
Crossover: Factory crossover with an 8.2-ohm resistor and a 2.2µF capacitor 
Finish: Walnut veneer 
Cabinet: Sealed design with approximate internal dimensions of 10 1/8" H x 5 7/8" W x 4 1/8" D 

Origin: Custom-manufactured in Korea for RadioShack