Absoluta Sound and Space Partenope User Manual page 32

Connections (continued)
activated the separation of the two stages (see p.28 n. 9).
Connect the pre out output of Partenope to the input of the
electronic crossover; connect the high frequencies output of the
crossover to the to the main in input of Partenope (see p. 23,
n.7); connect the output for low frequencies of the crossover to
the external amplifier input. Following these instructions you
will obtain a an active bi-amping. In this case it is possible to
utilize an external amplifier with a different current gain than
Partenope because the crossover usually has independent level
controls for each output.
The low output inpedence of the preamplifying section of
Partenope allows to drive more than one amplifier without any
problems.
The phono input can be set up as a normal line input or as a
Phono input
phono input using the two optional phono printed circuit boards
(optional phono stage, p.29)
The installation of the optional phono printed circuit boards
Note
must be done by an Absoluta dealer or by Absoluta.
Hum and ground loop
Phono input is particularly delicate due to the reduced output
level of pick-ups. This is even more so when MC pick-ups are
used. The lower the pick-up output level, the worse the signal-
to-noise ratio at phono input, the more likely the perception of
background hum.
To limit this problem, great care must be used to the connection
of the shield wire of the turntable interconnect. Usually, the
shield wire must be connected to Partenope's chassis binding
post. It may happen that this solution increases the hum, thus
some tests must be performed. Sometimes, connecting the shield
wire directly to the electric net's earth can help reducing hum: in
this case, a plug can be used in which the shield wire is
connected to the mid prong.
Sometimes, the hum is caused by a poor shielding of the
turntable interconnect. In this case, the replacement of the
turntable interconnect can be effective. Be aware that not all
good interconnects are good turntable cables, even if they're
perfect for line-level sources.
It may happen that a background hum is perceived when
listening to one or more sources, or even with all sources:
chances are that a round loop is affecting the system. A ground
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