MONACOR SP-4/60PRO PA Bass Speaker, PA Midrange, 30 Watt Rated Power and 8 Ohm Impedance, 4 Inches, Black 10.1600 : Amazon.de: Musical Instruments & DJ
CQRobot -Speaker 8 Ohm 3 Watt for Arduino, 2.54mm Dupont interface, it is ideal for a variety of small electronic projects. : Amazon.de: Electronics & Photo
Amazon.com: Low Profile Marine Subwoofer System - 1000 Watt 8 Inch Slim Active Waterproof Amplified Bass Speaker (White) & Hydra Marine Amplifier - Upgraded Elite Series 400 Watt 4 Channel Audio Amplifier : Everything Else
Amazon.com: Nooelec SMA DC Block in-Line 50 Ohm 50kHz-8GHz Connector Blocks DC Voltage from Your Radio or RF Test Equipment. Ultra-Low Insertion Loss (<0.3dB to 6GHz) and 2 Watts Maximum Power :
Amazon.com: Herdio 5.25 Inch Wall Mount Passive Speakers Indoor Outdoor in-Wall/in-Ceiling Speaker, Perfect for Covered Porches, Home, Office(2 Pairs,White) : Electronics
Pyle-Pro PDBT19 Horn Bullet 9.52 cm Titanium Dome Tweeter with Sound Around : Amazon.de: Electronics & Photo
Speaker Ceiling Wall Mounted Diameter 106 mm 45 Watt Metal Protective Grille Brackets 8 Ohm Easy Spring Mounting White : Amazon.de: Electronics & Photo