No high frequencies.

High frequency driver or

Listen at low level to the high frequency driver. If some sound is heard

 

crossover is malfunctioning.

from this area and it is not distorted, it is probably a crossover

 

 

problem. If distorted sound or no sound is heard, the driver or

 

 

crossover may not be working properly. Replace as needed.

 

SYMPTOM - SUBWOOFER

PROBABLE CAUSE

WHAT TO DO

 

 

 

 

No bass using Neutrik connector

Neutrik connector not seated

Make sure Neutrik connector is fully seated by twisting it clockwise

 

 

about 1/4 turn after plugging it in. Then engage the locking ring.

 

Distortion, low volume, or no volume

Cold/open solder joint on the

Using an ohmmeter, check the continuity of the crimp connectors, all

from any or all drivers.

input panel or faulty wiring

solder joints on the input panel and the wiring to the drivers.

Also

 

connection.

visually inspect solder joints as cold joints may only malfunction with

 

 

higher current than the ohmmeter supplies. Repair as needed.

 

No bass or bass is weak using an

No signal to the subwoofer.

Check that the electronic crossover has subwoofer output, that it is

electronic crossover.

 

properly connected to the amplifier, that the amplifier is properly

 

 

connected to the subwoofer, and that there is sufficient gain to drive

 

 

the subwoofer in relation to the full-range loudspeakers.

 

Bass is weak.

Incorrect subwoofer polarity.

Verify the polarity is correct: + and - amplifier outputs go to + and -

 

 

on loudspeaker. Note that in some cases, due to physical loudspeaker

 

 

placement, a reversed polarity connection will provide better coupling

 

 

to the full-range loudspeaker. Check by changing the polarity.

 

Bass is weak.

Poor physical placement.

Note that in some cases, the physical placement of a subwoofer can

 

 

have a significant effect on the bass energy in the listening area. If

 

 

possible, move the subwoofer at least 10 feet from its present location

 

 

to see if the bass energy changes. If it does than you may have to

 

 

change the subwoofer location.

 

No bass from 51.

Driver is not functioning.

Disconnect the amplifier and, using an ohmmeter, measure the

 

 

resistance at one of the input jacks. If the meter reads as an open

 

 

circuit, the LF drivers may not be working. Replace as needed.

 

Bass is weak on model 55.

One driver not functioning.

Disconnect the 2 wires from the amplifier, switch the loudspeaker to

(Note: The 55 has 2 LF drivers wired in

 

BIAMP mode, and, using an ohmmeter, measure the resistance

parallel.)

 

between the wires. If the meter reads about 6 Ohms one LF driver may

 

 

not be working. 3 Ohms is the normal reading. Replace as needed.

No bass from 55.

Both drivers may not be

Disconnect the 2 wires from the amplifier and, using an ohmmeter,

(Note: The 55 has 2 LF drivers wired in

functioning.

measure the resistance between the wires. If the meter reads an open

parallel.)

 

circuit, both LF drivers may not be working. Replace as needed.

 

No bass or bass is weak in system.

Subwoofer is not functioning.

Assuming all cabling and connections for the amplifiers are OK, listen

 

 

to the subwoofer at moderate levels for output from the driver(s). If

 

 

there is none the driver(s) may be malfunctioning and need repair.

 

FULL-RANGE OPERATED FROM SUBWOOFER FULL-RANGE OUTPUT

 

 

 

 

 

 

SYMPTOM

PROBABLE CAUSE

WHAT TO DO

 

 

 

 

No sound from full-range loudspeaker.

High pass crossover not

Disconnect subwoofer and connect full-range loudspeaker directly to

 

working.

the power amplifier. If it works OK then the crossover in subwoofer

 

 

is probably not working. If it does not work OK, see symptoms for

 

 

full-range loudspeakers.

 

No sound from full-range loudspeaker.

Cold or open solder joint on

Using an ohmmeter, check the continuity of the crimp connectors, all

 

the subwoofer input panel or

solder joints on the input panel and the wiring to the drivers.

Also

 

faulty wiring connection.

visually inspect solder joints as cold joints may only malfunction with

 

 

higher current than the ohmmeter supplies. Repair as needed.

 

Low volume from full-range

Acoustic balance not optimum.

When using the FULL-RANGE output on the subwoofer to feed a full-

loudspeaker or subwoofer.

 

range loudspeaker, the acoustic balance between them is determined

 

 

by their efficiencies. If this balance is not suitable then separate

 

 

amplifiers for the subwoofer and full-range loudspeaker are

 

 

recommended. The acoustic balance can then be adjusted using the

 

 

amplifier input level controls.

 

No sound from subwoofer.

Subwoofer not working.

See symptoms for subwoofers.

 

 

 

 

 

POLARITY CHECK FOR TWO LOUDSPEAKERS OR SUBWOOFERS

 

 

 

 

Sound image is poor and bass weak

Stand in front of and exactly between the loudspeakers or subwoofers. Play a mono source through

 

the system. If the sound does not appear to come solidly from a point between the loudspeakers

 

and/or the bass is weak, they are probably out of polarity. Check the + and - wiring for the entire

 

signal chain to each loudspeaker. The wiring should be identical.

 

PAGE 40 Community XLT / XLTE Series Owner’s Manual

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Atlas Sound XLTE owner manual No high frequencies