DaytonAudio MCA3545 Manuel de l'utilisateur - Page 3
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Jumper Settings
The MCA3545 has user selectable high and low frequency crossover points
which make the amplifier extremely versatile. The unit has 5 crossover
points that feature 24dB / octave slope and are selected using jumper type
connectors. Fig 1 shows location of crossover points on the preamp board
along with the proper method of connecting the jumpers.
Note: The factory setting is 3.8KHz for both the tweeter and woofer circuits.
Both the high (Tweeter) and low frequency (Woofer) crossover circuits have
their own jumpers. This makes it possible for the user to select different
crossover points for the "tweeter" verses the "woofer" circuits. The "tweeter"
connections are always the two left pins for each crossover point.
Note: Only one crossover point should be selected for each circuit (tweeter
or woofer).
Low Frequency Boost
The low frequency circuit also features a switchable boost setting. The boost
circuit adds roughly 3dB of gain throughout the low frequency range.Because of
this the crossover points for each setting are higher when the boost is activated.
Note: The factory setting for the boost circuit is "OFF". When activating the
boost both "Boost" jumpers must be in the "ON" position.The boost circuit only
effects the low frequency response.
Pre Amp Board
Fig. 1
Frequency Response Graphs
These graphs show the frequency response of each crossover point for
both the low frequency (woofer) and high frequency (tweeter). Each graph
also shows the effect of the "boost" circuit for each low frequency crossover
point. Note: As you can see from the graphs the crossover points are higher
when the boost circuit is activated.
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