Logic 3 Valve 80 Amplifier and Speakers for iPod (Black) Frequency response: 60-22kHz 3db - Nominal Impedance: 8 - Sensitivity: 85db 1 watt / 1 meter - Tweeter: 1-inch silk, shielded dome - Bass-mid: 4-inch Kevlar cone shielded - Crossover frequency 4.5 kHz - Dimensions (W x H x D): 6 x 10 x 8 inches High Gloss 'Piano Black' lacquer finish with a recommended RMS Power of 50w per channel The Hybrid vacuum TubeiPod Dock Amplifier has a High Gloss 'Piano Black' lacquer and Stainless Steel Finish, Hybrid Vacuum Tube iPod Dock - Power Output: 40W per channel - Frequency Response: 20Hz - 20KHz +/- 1.5dB; Harmonic Response:  0.5% Signal to Noise ratio:  86 dB; Input Sensitivity: 1.0V +/- 25% - Input Impedance: &gt;4K  - Output Impedance: 8 - Vacuum Tube Type: 6N1 x 2, 6E2 x 1 - Power Supply: Switchable 100V~120V / 220V~240V - Dimensions (W x H x D): 14.5 x 6 x 6.5 Inches Valve 80 Connectivity: Built-in docking station provides charging for iPod using dock, Composite Video Output, S- Video Output, 2x Audio input and Speaker outputs