SMF-5 mkIII ULTRA LOW NOISE STEREO MIC AMPLIFIER

Technical Data Input impedance 1 KΩ Max. input signal -6 dBu Max. output signal +24 dBu (bal) @ 600 Ω +18 dBu (unbal) Output impedance 2 x 22 Ω Gain +30...+70 dB Sockets XLR3 (bal. inputs/outputs) mini-tele 3.5mm unbal. out Frequency range 5 Hz ... 40 kHz (-3 dB) Equiv. input ref. noise typ. -131 dBu Power supply 10 - 35 VDC from external adapter or battery Size W x H x D 140 x 60 x 136 mm Weight   approx.0.9 kg

SMF-5mkIII is a new version of the highly appreciated SMF-5. It is an extremely low-noise microphone amplifier intended for high-end recording. SMF-5 has two parallel and separate channels. This version has a further reduced noise level, wide power supply voltage range and a headphones output. SMF-5mkIII is a microphone amplifier with ultra low noise level. It is intended for high-end recordings with high resolution. Each input has a top-of-the-line audio transformer by Lundahl. With this transformer the low-frequency distortion is negligible while frequency range is extended down to 5 Hz. Harmonic distortion is down to 0.006% @ 1 kHz and +12 dBu output with 30 dB gain. The input referred noise level is -131 dBu with a low-Z source. Gain may be individually set for each channel. Basic gain is selected with a toggle switch for 30 or 50 dB. Additional gain and fine adjustment is controlled by a potentiometer for a maximum of +20 dB. Total gain is 30 to 70 dB from input to the balanced XLR output. There is also a headphones output that will double as unbalanced output. Phantom power, 48 V may be selected by a toggle switch on the front panel. Power supply is by a separate mains adapter. Any voltage in the range 10 - 35 VDC will do. In contrast to the previous version of SMF-5 this version will not run from internal battery but the wide input voltage range offers a choice of different external battery types to be used. The DC input is fully isolated from the amplifier. SMF-5mkIII is housed in an EMC shielded case. An optional carrying case, made by PortaBrace, is available.