Amplifier Gain Matching
Make sure that no cables, including power cord, are connected to the DAX.
Remove the top cover of the DAX main unit by removing ten machine screws with the allen wrench
provided. Viewing the printed circuit boards from the front of the DAX, 4 printed circuit boards wilt be
visible: two smaller printed circuit boards attached to the front panel and two output printed circuit boards,
one left channel, one right channel, attached to the rear panel.
Locate switch #6(SW6) & switch #7(SW7), towards the left center of the output boards (Refer to Diagram
1). These switches allow matching amplifiers with different gains. Please consult your power amplifier
manual or manufacturer for this information.
SW7 attenuates the woofer level in 1 dB steps from 0 to -6 dB. SW6 attenuates the midrange/tweeter level in
1 dB steps, as well. For example, if you are using a power amplifier with a 20 dB gain on the woofer and
another power amplifier with a 23 dB gain on the midrange/tweeter, you would attenuate SW6 to position
number 3 which corresponds to -3 dB.
Speaker Selection
Switch #3(SW3) is used to select the appropriate filter shape for one of the two available speakers. Please
check the inspection certificate in the DAX packing carton with the factory preset values to make sure you
received the correct speaker model selection. SW3, on the middle right edge of the printed circuit board, can
be toggled to the left for Speaker A or to the right for Speaker B. Refer to Table 1 for the Apogee speaker
designation depending on the two speaker choices received.
NOTE: This must be done for both output boards!
TABLE 1
Speaker Combination Speaker
A Speaker
B
Duetta/Diva Duetta
Signature
Diva
Caliper/Diva Caliper
Signature
Diva
Centaur Major/Diva
Centaur Major
Diva
Balanced or Single-ended Input
Switch #2(SW2) is used to select either balanced or single-ended (regular RCA) input. SW2 is located right
above SW3 on the right edge of the printed circuit board. Toggled towards the right, or nearest edge of the
board, selects the single-ended input. Toggled to the left, or away from the nearest edge of the board, selects
the balanced input.
Both single-ended and balanced outputs are operational at all times so any combination may be used.
Impedance Loading (See Table 2)
Switch #5(SW5) is used to select the input impedance loading for the single-ended input. Switch #1(SW1) is
used to select the input impedance loading for the balanced input. SW5 is located in the upper right hand
comer of the printed circuit board as you face the front of the DAX. The label is not visible on the printed
circuit board, as it is hidden under the switch. SW1 is located to the left of SW5. There are four small rocker
bars in the switch, labeled 1-4. Only one toggle position is used for each setting. Be sure the other switches
are OFF. The DAX is preset at the factory for 80,000 ohms, single-ended, and 10,000 ohms, balanced (All 4
rockers in the OFF position).
