Marenius SMF-5mkIII User manual
MARENIUS
MARENIUS
ELEKTRONIKUTVECKLING AB
P O Box 5086
SE-42605 V Frolunda, Sweden
Te l +46-31-691610
Fax +46-31-693188
- Designers of Electronics -
SMF-5mkIII
UltraLowNoise Microphone Amplifier
Two low-noise microphone inputs•
Input transformers by Lundahl•
Gain range 30 - 70 dB•
48V phantom power•
Balanced XLR outputs•
Headphones socket•
10 - 35 V power supply•
Compact size•
SMF-5mkIIIisamicrophoneamplierwith
ultra-low noise level. It is intended for high-end
recording 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 ex-
tended 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
lowZ 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 ne 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.
The power supply may be in the range 10 - 35 VDC.
In contrast to the previous model SMF-5 this version
will not run from internal battery power although an
external battery may well be used.
SMF-5mkIII is housed in an EMC shielded case.
An optional carrying case, made by PortaBrace, is
available.
Visit www.marenius.com for information about other MARENIUS products.
User Instructions
Attach the PSU to the DC supply socket. Polarity should be center pin (+). The DC input is polarity protected.
Activate SMF-5 by switching POWER on.
Connect the microphones to the XLR input sockets.
Switch on 48 V phantom power, if desired.
Make a choice of balanced XLR or unbalanced output (through the front panel mini-tele socket).
Select basic gain by the gain switches and add additional gain by the potentiometers.
Connect a headphone to the front panel socket and adjust audio level by the phones gain potentiometer.
Note 1:
Do not short-circuit the XLR output signal pins 2 or 3 to GROUND pin 1. The outputs are transformerless.
Note 2:
Do not connect unbalanced microphones while 48V phantom power is active. This may destroy the microphone.
Dynamic, balanced microphones will not be damaged by 48 V phantom power.
Technical Data SMF-5mkIII
Frequency range 5 - 40 kHz (-3 dB)
10 - 20 kHz (+-0.5 dB)
THD @ 30 dB gain <0,006% @ 1 kHz, +12 dBu
Max. gain 70 dB (64 dB for unbal. out)
Channel crosstalk <-88 dB @ 1 kHz
Equiv. input ref. noise <-131 dBu with lowZ in
Input sockets XLR-3F
Mic input impedance 1 K ohms
Mic input level max. -6 dBu
Output sockets XLR-3M and mini-tele 3.5 mm
Audio output impedance 2 x 22 ohms balanced
Audio output level max. +24 dBu (XLR)
max. +18 dBu (mini-tele)
Phantom power 48 V+-1 V, max 5 mA
Power supply External supply 10 - 35 VDC,
2.1 mm socket
Size W x H x D approx. 140 x 60 x 136 mm,
excl. sockets and knobs
Weight approx. 900 grams
Carrying case PortaBrace original, optional
Specications are subject to change without notice.
Box includes:
1x SMF-5mkIII
1x Power supply
1x User Instructions (English)
SMF-5mkIII Nov 2010
Copyright MARENIUS ELEKTRONIKUTVECKLING AB, Sweden
MARENIUS
ELEKTRONIKUTVECKLING AB
P O Box 5086
SE-42605 V Frolunda, Sweden
Te l +46-31-691610
Fax +46-31-693188
- Designers of Electronics -
Visit www.marenius.com for information about other MARENIUS products.
Balanced sockets wiring:
1 ground/shield
2 hot
3 cold
