Wednesday, December 02, 2015





Surround Modes
When using the Modulus II system in a Dolby Pro Logic* home theater system, make sure the receiver’s center channel mode is set to “Normal.” When using the Modulus II system in a Dolby Digital or DTS home theater system, make sure the receiver’s speaker modes are set to “Small.”
Some Dolby Digital-equipped receivers/processors offer different setup options for each source or surround mode: e.g., CD-stereo, videotape, Dolby, Pro Logic. In each case, follow your equipment’s instructions to ensure that the subwoofer output is turned on and that the speakers are set to “Small”in each mode.
Power On
Plug your Modulus II subwoofer’s AC cord into a wall outlet. Do not use the outlets on the back of the receiver.
Initially set the subwoofer’s Level Control  to the “O”position. Turn on your sub with the Power Button  on the rear panel.
Auto On/Standby
With the Power Button  in the ON position, the Level Control on the front panel will remain backlit in red or green to indicate the On/Standby mode of the subwoofer. RED = STANDBY (No signal detected, Amp Off) GREEN = ON (Signal detected, Amp On) The subwoofer will automatically enter the Standby mode after approximately 10 minutes when no signal is detected from your system.The subwoofer will then power ON instantly when a signal is detected. During periods of normal use the Power Button  can be left on.You may turn off the Power Button during extended periods of nonoperation: e.g., when you are away on vacation.
Adjust Level
Turn on your entire audio system and start a CD or movie soundtrack at a moderate level.Turn your subwoofer’s Level Control  up to the “5”position (half way). If no sound emanates from the subwoofer, check the AC-line cord and input cables.Are the
connectors on the cables making proper contact? Is the AC plug connected to a “live”receptacle? Has the Power Button  been pressed to the “On”position? (Note:The Level Control  on the front panel will turn green when the power is on.) Once you have confirmed that the subwoofer is active, proceed by playing a sound source. Use a selection that has ample bass information Set the overall volume control of the preamplifier or stereo to a comfortable level. Adjust the subwoofer’s Level Control  until you obtain a pleasing blend of bass. Bass response should not overpower the room but rather be adjusted so there is a harmonious blend across the entire musical range. Many users have a tendency to set the subwoofer volume too loud, adhering to the belief that a subwoofer is there to produce lots of bass. This is not entirely true. A subwoofer is there to enhance bass, extending the response of the entire system so the bass can be felt as well as heard. However, overall balance must be maintained or the music will not sound natural. An experienced listener will set the volume of the subwoofer so its impact on bass response is always there but is never obtrusive.
Phase Control
The Phase Switch ∞ determines whether the subwoofer speaker’s piston-like action moves in and out with the main speakers, 0˚, or opposite the main speakers, 180˚. Proper phase adjustment depends on several variables such as room size, subwoofer placement and listener position. Adjust the phase switch to maximize bass output at the listening position.
Final Positioning
After correctly connecting the Modulus II system and verifying that both the subwoofer and all satellite speakers are playing, it is time to optimize the system for your particular listening room. Earlier, you placed the subwoofer in its general location. Finding the exact location for optimum performance sometimes only involves moving the speakers up to a few inches in any direction. We urge you, therefore, to experiment with placement, if possible, until your speakers deliver their full potential.

Equipment needed:
# Function/signal generator/sweep generator
# Integrated Amplifier
# Multimeter
# RCA cables; Speaker cables
General Unit Function (UUT = Unit Under Test)
MAIN LEVEL control full clockwise (0)
R.A.B.O.S. On/Off switch OFF
PHASE button - either position
(3) R.A.B.O.S. controls – do not matter
1) From the signal generator, connect one line level (RCA) cable to the Input jacks (L/R) on the UUT. Use a Ycable from a mono source if necessary to connect to both inputs.
2) Turn on generator; adjust to 150mV, 50 Hz.
3) Plug AC power cord in UUT, turn power switch ON.
4) Red LED should ON (in the Level wheel at the front of the UUT). Turn up LEVEL control to full counterclockwise .
5) Green LED should ON; Bass response should be heard and felt from port tube opening.
6) Turn LEVEL control full clockwise . Turn power switch OFF.
Sweep Function
1) Follow steps 1-3 above, using a sweep generator as a signal source – adjust the generator to 100mV, 50 Hz.
2) Sweep generator from 20Hz to 300Hz. Listen for any rattles, clicks, buzzes or any other noises. If any unusual noises are heard, test woofer according to the instructions below.
Driver Function
1) Remove woofer from the enclosure.
2) Check DC resistance of woofer; it should be 3.5Ohm +/-10%,
3) Connect a pair of speaker cables to woofer terminals. Cables should be connected to an integrated amplifier fed by a signal generator. Turn on generator and adjust so that speaker level output is 6.0V.
4) Sweep generator from 20Hz to 1kHz. Listen to driver for any rubbing, buzzing, or other unusual noises.