Thank you for selecting this Yamaha NX-E150 speaker system. PRECAUTIONS Read this before using the speakers. • To assure the finest performance, please read this manual carefully. Keep it in a safe place for future reference. • Install the speakers in a cool, dry, clean place – away from windows, heat sources, sources of excessive vibration, dust, moisture and cold. Avoid sources of humming (transformers, motors). To prevent fire or electrical shock, do not expose the speakers to rain or water.