AmbiSound performance. Each magnetically-shielded 3-way speaker houses a 5" woofer with bass reflex, a mid-range dome, and a ribbon tweeter, and gold-plated plugs for interference-free connections. 4 ohms 100W please not speakers have heavy scratches look closely at pictures but they are working as they should grills are in excellent condition speakers are very heavy 15lb each but they sound amazing