Mackie FR800/FR1400/FR2500 FR Series Owner's Manual - Page 13

Owner's Manual One side is louder than the other • Are both Level controls set to the same position? • Check your source signal to make sure the left and right signals are balanced. • Are the speaker impedances matched? Different speaker loads can cause different volume levels on each side. • Try switching sides: Turn off the amp, swap the speaker cables at the amp, turn the amp back on. If the same side is still louder, the problem is with your speaker cabling. If the other side is louder now, the problem is with the mixer, the amp, or the line-level cabling. Poor Bass response • Check the polarity of the speaker cable connections. You may have your positive and negative reversed at one end of one speaker cable. As the music gets loud, the amp shuts down • Make sure the OL LEDs are not lighting continuously. If so, turn down the signal source or the amp Level controls. • Can the amp breathe? It needs plenty of fresh air to stay cool. Do not block the ventilation holes. Noise/Hum • Check the signal cable between the mixer and the amplifier. Make sure all connections are good and sound. • Make sure the signal cable is not routed near AC cables, power transformers, or other EMIinducing devices. • Is there a light dimmer or other SCR-based device on the same AC circuit as the amplifier? Use an AC line filter, or plug the amplifier into a different AC circuit. • If possible, listen to the signal source with headphones plugged into the console. If it sounds noisy there, the problem is not in the amplifier. • Is there a cable-TV audio feed in your system? An incorrect ground may causes a "ground loop" hum. • Sometimes it helps to plug all the audio equipment into the same AC circuit so they share a common ground. Repair Service for Mackie products is available at a factoryauthorized service center. Service for Mackie products living outside the United States can be obtained through local dealers or distributors. If your amplifier needs service, follow these instructions: 1. Review the preceding troubleshooting suggestions. Please. 2. Call Tech Support at 1-800-898-3211, 7 am to 5 pm PST, to explain the problem and request a Service Request Number. Have your serial number ready. You must have a Service Request Number before you can obtain warranty service. 3. Keep this owner's manual and the detachable linecord. We don't need them to repair the amp. 4. Pack the amplifier in its original package, including endcaps and box. This is VERY IMPORTANT. Mackie is not responsible for any damage that occurs due to non-factory packaging. 5. Include a legible note stating your name, shipping address (no P.O. boxes), daytime phone number, Service Request Number, and a detailed description of the problem, including how we can duplicate it. 6. Write the Service Request Number in BIG PRINT on top of the box. Units sent without the SR number will be refused. 7. Tech Support will tell you where to ship the amplifier for repair. We suggest insurance for all forms of cartage. 8. You will need to contact the authorized service center for their latest turn-around times. Once it's repaired, the authorized service center will ship it back by ground shipping, pre-paid (if it was a warranty repair). Note: Under the terms of the warranty, you must ship or drop-off the unit to an authorized service center. The return ground shipment is covered for those units deemed by us to be under warranty. Note: You must have a sales receipt from an authorized Mackie dealer for your unit to be considered for warranty repair. Owner's Manual 13