Bookshelf speaker series auna linie 501 power rating 50 watt system 2 way system principle passive impedance 8 ohm power supply passive colour brown cabinet surface walnut housing material wood speaker enclosures closed removable speaker cover wall mounting possible number of tweeters 1 treble chassis 25 mm number of mid range drivers 1 midtone chassis 100 mm speaker terminals screw terminal gold plated width 150 mm height 285 mm depth 24