We service:
Interference from other devices.
The speakers don’t match the subwoofer.
Lack of power.
Before you get started, make sure all equipment is turned off, including the subwoofer. You never want to connect or disconnect any cables while anything is on, lest something incurs accidental damage.
Check connections and speaker wires. Starting from the subwoofer, check all the wires and connection points running to amplifiers, receivers, or speakers. Check to make sure that cables are firmly connected and plugged into the correct spots.
The inputs on the back of the subwoofer generally plug into the subwoofer output on the back of receivers or amplifiers. If the subwoofer connects to speaker outputs on the receiver or amplifier, inspect the entire length of wire connections for defects. If any bit of wire appears to be worn, torn, or damaged, replace those wires before attempting to use the equipment again. Perform a quick test on the wires to check that they work.
How to Splice Wires and Extend Stereo Speaker Connections in 5 Steps
Check outlets, power cable, and fuse. Most subwoofers have a “standby” LED that glows to indicate active power. If it’s not lit, check that the subwoofer is securely plugged into a wall socket, surge protector, or power strip. If a plug’s prongs slip out halfway—it’s often enough to prevent the flow of power—gently bend them so the cable will stay connected after you let go. Make sure that all associated switches (i.e. ones on walls, power strips, etc.) are flipped to the on position. If the subwoofer still doesn’t power on, try plugging it into a different outlet that you know works properly.
As with the speaker wires, inspect the subwoofer’s power cable for any damage or defects. Some subwoofers are equipped with a fuse, which may or may not require removal of a back plate. If the fuse is a feature, and if you’re comfortable tinkering with electronics, check to see if it needs replacing. Otherwise, consult the manufacturer or local repair shop first.
Check system and menu settings. If all the wires and cables look good, revisit the menu settings on your receiver or amplifier—you never know if someone might have accidentally changed it all. Check that the subwoofer is associated with the proper audio input selections. Make sure that the subwoofer’s output hasn’t also been adjusted down.
If the input device offers speaker size settings, choose the smallest option first; sometimes setting the speaker size to something larger makes it so that the subwoofer doesn’t receive a signal. Some receivers will, in fact, allow subwoofers to operate with a large speaker setting, so consult your product manual for additional details.
Subwoofer Buzzes or Hums? Bring Back the Clean Boom
Verify connections, turn on the subwoofer, and set the volume. After all connections and settings have been verified, turn on the subwoofer. Check the volume level on the subwoofer and receiver or amplifier before sending any audio input. Start the volume low and gradually increase it to determine if the subwoofer is working correctly. Choose music test tracks that feature low-end bass content so there is no question one way or another.
Public Address Systems Set-up & Services
We repair public address systems systems, sound systems, home theatres and electronics. We also install and assemble sound systems for customers in and around Nairobi Kenya.
What Can Go Wrong With a Public Address Speaker?
Public address speakers often fail as a result of improper use. Some of the most common issues with these speakers include:
public address systems services in nairobi kenya
How to Identify PA Speaker Problems
Tip 1– In case the loudspeaker is not producing any sound, check that the source component is properly connected and adjusted. If the components are well-connected, you’ll need to disassemble the cover. First, power it off from the main power before any disassembling. Check the fuse for any signs of damage. If the fuse is blown, replace it.
Tip 2– If there is no sound from the drivers, try testing the fuse, drivers, and crossover wiring. Replace any damaged part. If possible, test the components on a similar speaker. If you still fail to get sound, the receiver may be faulty.
Tip 3– If one driver is not producing any sound, you’ll need to test it. You can press the cone lightly with your finger to check for any vibration. In case it’s not vibrating, then you should replace the driver.
Tip 4– If you’re getting distorted sound, try flexing the sound cable at low volume. If the sound changes while flexing the cable, clean the connectors and replace the cable. Also, check whether you’ve connected the cable properly. If no sound, press the cone with your fingers repeatedly. In case it’s not moving smoothly, replace the cone.
Tip 5– If the loudspeaker sounds noisy, the voice coil may be damaged. You’ll need to check it for any signs of damage such as holes. In case you find a hole, seal it with rubber cement. If the damage is major, replace the driver. If the cone has no signs of damage, try cleaning the volume control using an appropriate electronic contact cleaning agent.
Tip 6– In case you’re getting intermittent sound, check whether all connections are fixed properly. Also, check the coil and test the fuse.
Tools Needed For Fixing PA Speaker Problems
You’ll need these materials and tools to repair your loudspeaker:
Replacement component
Speaker repair kit
Foam
Wire
Rubber cement
Multimeter
How to Repair a PA Speaker
Step 1-Turn off the main power and unplug the power cable. If it’s not powered by AC, unplug any speaker cable.
Step 2– Next, start disassembling the speaker. Remove the grill to expose the drivers and crossover. Depending on the make of your loudspeaker, the grill may be secured with screws, snaps or glue.
Step 3– Detach the drivers. Some drivers are screwed while others are sealed. In case it’s sealed, use a sharp knife or blade to detach it. When reattaching the driver after repair, use an appropriate sealant in case it was sealed in place.
Step 4– Lift the speaker driver to expose wire connectors. Remove the connectors carefully with a pliers. Some connector wires may be soldered in place.
Step 5– Remove the crossover if necessary. Most crossovers can be accessed easily from the front while others can only be accessed after removing the main driver.
Step 6– Test the fuse using a multimeter.
Step 7– Using the multimeter, test the resistance on the crossover network, terminal block and the driver. The resistance of most drivers is written on the back in ohms.
Step 7– Replace any damaged component and reassemble the unit.
Repairing a Damaged Cone
If you found a small hole or tear on the cone, you’ll need to seal it. Apply some rubber cement on either side of the hole. In case the tear is extremely large, the cone may need replacement.
How to Obtain the Correct Polarities (Speaker Phasing)
If you have incorrectly attached the speaker cable, you’ll get poor sound or no sound at all. Thus, you need to ensure that the speaker is in phase. This means that the terminals should be properly connected. The positive terminal is usually red in color whereas the negative terminal is black.
However, if your cable is not colored, ensure the positive terminal of the source is connected to the positive terminal on the loudspeaker. The negative connector should go to the negative terminal. This way, you’ll get rich sound.
While identifying and fixing PA speaker problems, you might wonder whether to repair or replace some components. It’s often inexpensive to replace the fuse, cables and sealing tiny holes on the cone.
However, replacing the driver might be a bit more expensive depending on the brand. If it’s beyond your budget, you can have the driver re-coned. If an issue is beyond repair or replacement, consider buying a new PA speaker.