Alesis 520 Active Monitor Speakers in London, Essex for sale

For sale or my Alesis 520 active monitor speakers, please see below for spec etc. In great cosmetic condition, apart from the bottoms which have scratches on them. £85, pick up from Hither Green/Catford, no box but kettle lead supplied. Features: Two-way, active, bi-amplified pair of reference studio-monitor loudspeakers Wide, 56 - 20,000 Hz frequency response 60W system with 30W per speaker Five-inch lightweight polypropylene woofer One-inch silk-dome tweeter Integrated USB audio interface with 16-bit, 44.1/48 kHz recording and playback Two balanced-1/4" inputs Stereo, 1/4" headphone output Magnetically shielded for placement near TV and computer monitors Low-resonance cabinet with tuned bass port Bi-color signal/clip indicator Switchable power supply ensures worldwide operation Specification: Low-frequency driver: 5" lightweight, magnetically-shielded, ultra-stiff polypropylene cone with rubber surround and high power handling voice coil High-frequency driver: one-inch silk dome with magnetic shielding Frequency Response: 56 - 20,000 Hz Power: 30 W per channel RMS Signal-to-Noise Ratio: 90dB weighted Digital Conversion: 16-bit delta sigma, 44.1kHz or 48kHz sampling rate Inputs: two balanced-1/4" Polarity: Positive signal on "+" pin creates forward cone displacement Input Impedance: 10k ohms Input Level: -10dBV nominal, balanced Dynamic Range: 80dB Dimensions: (WxDxH) 7.25" x 8.875" x 10.625"