Via Monti Urali, 29 – 42122 Reggio Emilia (Italy) • Telephone: +39 0522 557735 • [email protected]
These two presets are factory set at the time of delivery and the user cannot modify them.
Audio sets include frequency cuts and the correct limitations for the particular systems of
loudspeakers which can be connected.
The intervention thresholds of the limiter are different fo r these two core prest es,
because they are made to power specific and different speakers: it is very im portant
always to set the right preset for the connect ed system of loudspeakers to get the
correct sound by the different speakers, but above all not to damage them.
A second switch named “DSP User” allows to activate an additional DSP processing to the
two core sounds. The parameters of this filtering are modified via PC remote control and
can be saved in file (.dse). With the “DSP User” switch set to “On”, the current audio set (if
the PC is connected) or the audio set at the last disconnection of the PC is activated. With
the “DSP User” switch set to “Off” the additional filter is deactivated and the sound heared
refers to the core presets. See paragraph “DSP Remote Control” for more details.
For further exlanations please refer to Figure 5.
Amplifier:
The two channel amplifier is made with switching tchnology and it can give 1250 W per
channel into 2 Ohm impedance. In case of use with the JA401
2
speaker for front insulation
measurements, the two channels are used to amplify respectively the transducers for low
and high frequencies, that is in bi-amplification mode. With the JA12 dodecahedron
channel 2 is used for the dodecahedron and channel 1 for the JASW12 subwoofer; the
subwoofer can be disconnected.
Connections:
A 4 poles female SpeakOn connector is supplied for the power audio output, with the
following pinout (Table 1), depending on the preset switched:
PRESET
OUTPUT 1+
1-
OUTPUT
2+ 2-
JA12
JASW12
(if present)
JA12
JA40
JA40
LF
JA40
HF
Table 1: Amplifier output pinout
A 4 poles
adpater cable
is included in the package with male and female SpeakOn
connectors (Figure 6).
It must
be always connected to the JA12 dodecahedron
and it is for adapting the JA12
inside connections to the pinout described in Table 1 (This adapter turns
JA12
into a sole
input on pins 2+ 2- with 3 Ohm impedance, suitable for
JADSP1250
amplifier, by
connecting in parallel two 6 Ohm inputs natively supplied).
