Mackie SRM150 User Manual - Page 12
Ac Power Considerations, Care And Maintenance - active speaker
![]() |
View all Mackie SRM150 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 12 highlights
AC POWER CONSIDERATIONS CARE AND MAINTENANCE Be sure the SRM150 is plugged into an outlet that is able to supply enough current for the amplifier. Your Mackie active loudspeaker will provide many years of reliable service if you follow these guidelines: Under maximum SPL conditions, where musical peaks are just hitting the limiter, the SRM150 model draws 2 amps on average. Under normal conditions, the current draw is below 1 amp. Avoid exposing the loudspeaker to moisture. If it is set up outdoors, be sure it is under cover if you expect rain or you live in Washington. We recommend that a stiff (robust) supply of AC power be used because the amplifier places high current demands on the AC line. The more power that is available on the line, the louder the speaker will play and the more peak output power will be available for cleaner, punchier bass. A suspected problem of "poor bass performance" is often caused by a weak AC supply to the amplifier. If lighting is used in a show, it is preferable to power the lights from a separate AC circuit than the one powering the audio equipment. This will help minimize noise from the lights coupling into the audio (particularly if SCRs, or light-dimmer switches, are used). • Avoid exposure to extreme cold (below freezing temperatures). If you must operate the loudspeaker in a cold environment, warm up the voice coil slowly by sending a low-level signal through it for about 15 minutes prior to high-power operation. • Use a slighty damp cloth with a mild soap solution to clean the cabinet. Only do this when the power is turned off. Avoid getting moisture into any of the openings of the cabinet, particularly where the driver is located. Wherever possible, connect all of your audio equipment to the same electrical circuit. This will help reduce the possibility of a ground loop problem causing an annoying hum in your speakers. A maximum of five SRM150s can be connected per 15A service (120 VAC). This allows each SRM150 to be safely operated at its maximum level. When turning your system on, turn on the SRM150s last. This will stop any turn-on thumps and bangs from your source equipment being amplified. When turning off your system, turn off the SRM150s first. This will prevent any turn-off thumps and bangs from your source equipment being amplified. When setting up for a show, often you are plugging into an AC power distribution system you know nothing about. You may even be faced with 2wire outlets that are missing the third safety ground pin. It's a good idea to have a three-wire AC outlet tester in your toolbox so you can check the outlets yourself to make sure they are wired correctly. These testers will tell you if the polarity of the hot and neutral wires is reversed and if the safety ground is disconnected. Don't use an outlet if it is wired improperly! This is to protect yourself as well as your equipment. Never remove the ground pin on the power cord of the SRM150 or any other component. This is very dangerous. 12
![](/manual_guide/products/mackie-srm150-user-manual-e789c7b/12.png)