The FET51P is designed for live performances, professional studio
max. input signal +12
48 volt phantom powered +/- 10%
buffer output 0db current 21 mA
impedance 1 K dc converter:
insert loss -12db freq. 120khz
xlr output imp. 600 ohm 18volt
frequency 10hz-30khz (-3db point) max current 100 mA
frequency 10hz-50khz (-6db point)
signal to noise ratio >90dB
input imp. ----
The FET51P is a Direct Box that represents the best of Active and Passive designs.
It has an extremely high input impedance ,
Extremely Low noise and distortion
and a transformer balanced output with screened output transformer.
Possibility to lift Ground, and earth isolation (isolated internal DC/DC converter).
This Active Direct Inject (D.I.) Box is designed for optimum performance jointly with
any musical instrument signal source, The input is buffered by a FET (Field Effect
Transistor) class (A) preamplifier which has a high input impedance. The XLR
output is isolated with a high performance audio transformer while the screened
output transformer provides perfect isolation between the input and XLR output of
the D.I. Box. The FET51P also has one output to provide a buffered output
connection to a stage/musicianís
amplifier. The transformer provides maximum
immunity to external electrical interference and also reduces earth noise to an
absolute minimum in particular used in electrically hostile environments. This D.I. is
designed to operate without earth, many other active D.I. boxes will not operate
correctly, or will not operate at all when the earth switch is lifted as there is no
return path for the 48 volt Phantom Power.There is a DC/DC converter used to
power the di-box true its own isolation
transformer, this provides earth isolation
at all times. High level inputs up to +12dBu are no problem, pad switch is not needed!. The D.I.ís high input impedance minimizes loading of the signal source.
This results in minimal loss of frequency response when used with instruments with
high source impedances, for example guitar
pickups, Piezo pickups etc.
The FET51P is also suitable to connect low output impedances such as keyboards,
mixers and other equipment.
Impedance matching is not required, because matched impedances low to high are
generally undesirable and normally not used in audio systems.