Boston Acoustics GT-40 Setup Tuning-Rear Fill Speakers, Setup Tuning-Subwoofers, Front Q Control

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Setup Tuning—Full-range Speakers (cont.)

8) FRONT “Q” Control

Once the FRONT highpass crossover point has been determined, use the FRONT “Q” control to increase the bass information centered around the crossover point.

Setting the front “Q” control is done in conjunction with setting the levels on the input sensitivity and highpass crossover frequency controls. You may find while setting the “Q” that bottoming may be detected in the front speakers; lowering the “Q” input sensitivity or raising the highpass crossover point will eliminate this. Minor adjustments to each setting are required to fine-tune the system.

Setting the “Q” is a subtle process. It is recommended that the “Q” setting be left in the 0.7 position and adjusted only after the input sensitivity and highpass crossover ranges are known. Small adjustments to the “Q” setting are all that are required to fine-tune the system.

9) REAR Input Sensitivity & Crossover Controls

Setting levels for the rear channels proceeds the same as for the front except for the elimination of the “Q” control settings. Crossover selector switch must be set to “HP” and filter switch must be set to “ON.” If the loudspeaker being used is capable of full-range operation, filter should be set to “OFF.”

Setup Tuning—Rear Fill Speakers

You may set the rear channels for summed mono operation from the L & R REAR RCA inputs by setting the REAR INPUT switch to the right-hand MONO position and then connecting the L & R REAR loudspeakers normally as you would for regular stereo operation. This configuration is beneficial for rear fill in some appli- cations.

Setup Tuning—Subwoofers

1) SUBWOOFER LEVEL Control

Refer to subwoofer level control in owner’s manual. If the control is not used, SUBWOOFER LEVEL switch must be set to “OFF.”

2) REAR Input Switch

Move switch to the right-hand (MONO) position, the inputs are summed to mono. Connect the subwoofer to the REAR SPEAKER OUTPUT terminals marked for MONO operation. NOTE: Subwoofer impedance is 2 ohms minimum.

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Contents Channel, High-Current/High-Power Amplifier GT-40Table of Contents Parts List Features and SpecificationsControl Functions Control Rear Input SwitchStatus LED Indicators Rear RCA InputsMechanical Functions Fuses Wire ConnectionAmplifier Linking Battery & Charging System General Installation PrecautionsBefore You Install Wire RoutingInstallation-Amplifier Mounting Choose the Mounting LocationPassenger & Trunk Compartment Mounting Installation-Fuses & WiringWire Gauge Amplifier FusesSpeaker Output Connection Power/B+ & Power/GND ConnectionRemote Input Connection Setup Tuning-Full-range Speakers Front Input Sensitivity Control VolumeHead Unit Front Crossover ControlsSubwoofer Level Control Rear Input Switch Setup Tuning-Rear Fill SpeakersSetup Tuning-Subwoofers Front Q ControlRear Input Sensitivity Control Rear Crossover ControlSystem B-Full-range Front with Rear Fill System ExamplesSystem A-Full-range Front with Full-range Rear System C-Main Speakers with Single Subwoofer 2Ω System D -Main Speakers with Parallel 4Ω Subwoofers 2Ω loadEngine Noise from Speakers Amplifier Troubleshooting GuideStatus LEDs on Amplifier not Lit-Head Unit Source Turned on If Service Seems Necessary Contact and Warranty InformationLimited Warranty US