SR-407 Earspeakers + SRM-006tS Vacumm Tube Driver The SRS-4170 is a high-quality combination system of the earspeaker SR-407 (Signature) employing the same sound element as the new Λ series SR-507 and the SRM-006tS driver unit with the vacuum tube output stage. The SRM-006tS is equipped with two RCA and one XLR input terminals and the double-axis 4-gang volume controller can accept fully balanced source signals. Moreover, in order to make the most of full balance circuit, each low-noise FET was carefully measured and thermally combined each other. This resulted in the stable operation of the completely direct-coupled DC circuit with no coupling capacitor and brings out the maximum performance of the SR-407 full-balance sound element. The comfortable string and rich low- and mid-range sound of the SRS-4170 system covers all genres from vocal to orchestra and enables you to enjoy music over a long period of time. The PC-OCC special-made wide low-capacity parallel cable employed for the SR-407 can send signals from the driver unit to the sound element with little loss, realizing clear and distortion-free music reproduction. SR-407 Signature Earspeakers Type Electrostatic, Open, Oval Sound Driver Frequency Range 7~41,000Hz Capacitance 110pF (including cable) Sensitivity 101dB/100V rms Cable 2.5m, 6 strand, Wide format, Low Capacitance Weight with cable 515g, without cable 340g Total Weight in Retail box 800g Standard Earpads EP-234BR Compatible Earpads EP-234 series SRM-006tS Vacumm Tubes Driver unit Frequency response: DC 80 kHz / +0, -3 dB (when using one SR-407) Rated input level: 100 mV with 100V output Maximum input level 30 Vr.m.s. at minimum volume Amplification: 60 dB (x1000) Total harmonic distortion  max. 0.02% at 1 kHz 100 V r.m.s. (when using one SR-407) Input impedance 50 kΩ / during balance 50 kΩ x2  Maximum output voltage: 300 V r.m.s. / 1 kHz  Standard bias voltage DC580 V (PRO bias) External dimensions 195x103x375 mm Weight 3.4 Kg XLR Polarity 1 Ground, 2 Hot, 3 Cold (European) Vacumm Tubes 6CG7/6FQ7 × 2 SRS-4170 Signature System Weight in Retail Box 4.5kg		Japan Made. Highest manufacturing standard Contents .. SR-407 Earspeakers (Brown only) SRM-006tS Vacumm Tube Driver powered on AC100V . We sell Voltage Converters. Japanese Manual Supplied by Authorized Resellers in Japan. 1 year Japan Warranty from the day we sent your parcel. We can help you liaise with the maker in Japan. You will pay for postages to/from our Japan office. Singapore and Malaysia buyers can bring/post to us locally. We will deliver FREE to/from Japan. Return postage chargeable.