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SMF-5mkIII
ULTRA LOW NOISE
STEREO MICROPHONE AMPLIFIER

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. Polarity is not critical.
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.

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 3.5 mm (unbal. outputs) 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 CE conformity This unit does conform to the european EMC directive Optional accessoires PortaBrace carrying case

SMF-5 Ultra Low Noise Mic Amp datasheet + Manual

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MARENIUS
ELEKTRONIKUTVECKLING AB
P.O. BOX 5086
SE-42605 V FROLUNDA
SWEDEN
Phone +46 31 691610
Fax +46 31 693188
Mail info@marenius.com