Passive Preamp Source Loudspeaker Box RCA No Power Volume Adjustment Controller 1. Non source prime stage stereophonic volume adjustment controller, 2. Suitable to too big volume gain equipment (example computer sound card, DAC decoder, CD machine, digit player, source loudspeaker box, late stage power amplifier and other equipment), 3. Volume adjustment adopt professional 129mm clipper volume switch, smaller clipper switch precision error, more better left and right track synchronization, sound details no consumption. 4. Make table type volume adjustment more convenient, volume size adjustment more visual and exquisite size. 5. Simple installation: input and output, able to be used once inserted, convenient to install, signal source non consumption adjustment, then can enjoy different hearing experience Product Parameter 1. Material: Metal 2. Interface: Gold plating RCA interface 3. Power supply: No need additionally connect power supply, able to be used once inserted 4. Input and output impedance: 10Kohm - 50Kohm 5. Frequency responding: 20 - 20kHz. 6. Distortion: Less than 0.002% 7. Output consumption: Less than 0.01dB 8. Signal gain: 0dB 9. Signal-noise ratio SN: Greater than 98dB 10. Input and output interface: Standard RCA interface 11. Volume control switch: Adopt professional 128mm clipper volume switch 12. Single product net weight: 0.54 kg 13. Product size: 170mm x 69mm x 50mm