Bottom line, if you want a good sub for both music and movies in a medium to large sized room. Please make sure that you are posting in the form of a question. Showing of 11 reviews. Put it in a corner where it is tuned to the resonant frequency of the floor and drywall in that corner, sure it can get pretty whoofy at that frequency.

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The specifications and details in this and related JBL publications are therefore subject to change without notice. It is assumed that any person who removes the amplifier from this cabinet has been properly trained in protecting against avoidable injury and shock.

Therefore, any service procedures are to be performed by qualified service personal ONLY! Caution Early revisions of the unit did not have a power switch. Hazardous voltages are resent within the unit whenever it is plugged in. Before amplifier is plugged in, be sure its rated voltage corresponds to the voltage of the AC power source to be used. Incorrect voltage could cause damage to the amplifier when the AC power cord is plugged in. Note there is no power switch on early revisions of this unit.

When the power plug is plugged in, the unit is live. Connect the unit to its rated power source. Using an ammeter, measure the current between the neutral side of the AC supply and chassis ground of the unit under test.

If leakage current exceeds 0. Reverse the polarity of the AC supply and repeat. Measure the resistance from either side of the line cord to chassis ground, If it is less than k ohms, the unit is defective. DO NOT return the unit to the customer if it fails one of these tests until the problem is located and corrected. Critical Components A All components identified with the IEC symbol in the parts list and schematic diagram designate components in which safety can be of special significance when.

Use only the replacement parts designated in the parts list or parts with the same rating of resistance, wattage or voltage. Use with factory replacement panel strain relief only. PT1 Power Transformer. Use only factory replacement. BR1 Bridge diode. C6,8 uF 50V electrolytic filter caps.

Be sure replacement part is at least the same working voltage and capacitance rating. Also the lead spacing is important. Incorrect spacing may cause premature failure due to internal cabinet pressure and vibration. Please look over the following three examples to determine which description best matches your system and follow the corresponding hookup instructions.

To use the binding-post speaker terminals with bare wire, unscrew the collar until the hole through the center post is visible under the collar. Insert the bare end of the wire through the hole in the post, then screw the collar back down until the connection is tight.

The holes in the center of the collars are intended for banana-type connectors. Wiring "out of phase" results in thin sound, weak bass and a poor stereo image. The customer is responsible for proper connections, and any damage to J BL or other equip- ment due to improper connec- tions will not be covered by your J BL warranty.

Consultwith yourj B L dealer or an audio- installation expert if you have any questions about how to connect your subwoofer using the speaker-level inputs. It is important that you avoid join- ing any other wires. Do not twist together wire ends that are being inserted into terminals on any speaker or on the subwoofer. Do not twist together wire ends that will be used for any speakers other than the front left and right speakers or the subwoofer.

Refer to the connection dia- gram for guidance. It makes no differ- ence which jack you choose. Connect each speaker to the corresponding speaker terminals on your receiver or amplifier.

Make sure your receiver or processor is config- ured so that the sub- woofer is "On. Use the line-level input jacks for the Low- Frequency Effects channel. Connect these jacks to the LFE output or subwoofer output on your receiver or amplifier. It makes no difference which jack you choose.

When a signal is present, the LED will turn green. Note: It will take several min- utes for the LED to turn from green to red after the input signal to the subwoofer is removed.

Proper level adjustment depends on sev- eral variables such as room size, subwoofer placement, type of main speakers and position. Adjust the subwoofer level so that the volume of the bass information is pleasing to you. If your main speakers can com- fortably reproduce some low- frequency sounds, set this control to a lower frequency setting, between 50Hz and Hz.

Of course, the sub- woofer can be turned off, whenever desired, if you do not wish to leave it in auto standby mode. There is no correct or incorrect setting. Proper phase adjustment depends on several variables such as subwoofer placement and listener position.

Make sure all wires are con- nected. Remember, every system, room and listener is different. There are no right or wrong settings; this switch offers the added flexibility to adjust your subwoofer for optimum per- formance for your specific listening conditions without having to move your speakers.

If at some time in the future you happen to rearrange your listening room and move your speakers, you should experi- ment w ith the phase switch in both positions, and leave it in the position that maximizes bass performance.

M ake sure all wires are connected. M ake sure none of the wires are frayed, cut or punctured, or touching each other. Low Pass control should be set fully clockwise Hz. Cables should be connected to an integrated amplifier fed by the signal generator. Sweep Function 1 Follow steps above, using a sweep generator as a signal source. Listen to the cabinet and drivers for any rattles, clicks, buzzes or any other noises. If any unusual noises are heard, remove driver and test. Cables should be connected to an integrated amplifier fed by a signal generator and adjust so that speaker level output is 5.

Listen to driver for any rubbing, buzzing, or other unusual noises. They should be identical. Setting Output CW FI T1.


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