The speakers are typical 4 Ohm loudspeakers, which harmonise with every HiFi amplifier. In order to enjoy the full dynamics, it is recommended that you use a powerful amplifier with an output power of 120 - 200 watts. Two 6.5" woofers, a high tweeter with silk dome and built-in NUMAN sound guide as well as aluminium die-cast chassis, ferrite magnets and a closed wooden case with damping material made of acoustic convoluted foam guarantee an extraordinary listening experience with special detail. For sound tuning, M8 threaded sockets are inserted into the bottom plate of the housing. This way, the spikes can be used directly without complicated conversions.