For sale: The Philips (Siera) 6541 Motional Feedback (MFB) active speakers incorporate advanced motional feedback technology to enhance sound fidelity. Here are the key specifications and features of these speakers: Tested: Fully working end tested. Frequency Range: 35 Hz to 20,000 HzInput Sensitivity: 1 Volt over 10k Ohm for connection to control amplifiers, 7.5 and 19 Volts over 100 Ohm for connection to low-impedance power amplifiers.Amplifier Output Power: 30 Watts continuous (0.1% distortion at 30 Watts), power bandwidth 10-3,000 Hz, frequency range 5-2,000 Hz. Mid and high frequencies: 20 Watts output power (0.1% distortion at 20 Watts).Separation Frequency: 1,400 HzSpeakers:Low-frequency: AD7066/MFB4 with a 17.5 cm diameterHigh-frequency: AD0161-T8 Dimensions: 22 cm x 29 cm x 17,7 cm (W x H x D)Weight: 6,7 kg per Unit Working condition: Fully working (See pictures for the cosmetic condition of this lot)Missing or damages: Minor Usage Marks Does come with power cable. We ship worldwide.-Shipping in the EU up to 30 KG (max)-Shipping outside of the EU up to 20 KG (max)We offer combine shipping (EU 30KG max, NON EU 20KG max) for all our listings, ask us for details Please note: ??Whenever an item exceeds the weight noted above. Please ask for a shipping quote before making a purchase. The shipping costs are estimated in our shop because we do not know the shipping address. Picking up the item is also possible. It can either be picked up in Alkmaar or Soest on appointment Delivery is also possible in some cases. Please reach out to us for more information about deliveries