Differences aktiv 05 Revision A and Revision B
aktiv 05 is produced
in two different hardware revisions: Revision A (no
standby) and Revision B (with standby).
You can recognize Revision B with the "Revision B" writing next to
the power connector. If this is missing, the unit has Revision A.
The newer Revision B is shipped since late 2012 to retailers around Europe.
However, Revision A is still available especially in other parts of the world.
There are no significant differences between the two models. They are identical
in sound and performance, they use the same high frequency and low frequency
drivers and the same amplifier and crossover circuitries.
The main difference is the standby energy saving functionality of Revision
B, which can be controlled via the POWER MODE switch on the back panel
which can be activated (STANDBY) or deactivated (ON). When it
is activated, aktiv 05 automatically goes into a power saving sleep mode when
no audio signal is played after some time. Once the signal returns, playback
Additionally, Revision B is missing the AC Selection switch to select
operation with 115V or 230V. Instead, power is detected automatically.