Question about Mackie SWA1501 Subwoofer

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Hi,i ve a problem with my mackie swa 1501 subwoofer... i turn it on but the led on the front pannel (blu)doesn't work while the rear pannel's lights are on (green)... i connect the cables and the input signal's light (green) starts when i increase the volume but no sound comes out... if i increase input level too much clip limiter led (orange) start working till i get the volume down as normal inside, the fuse are ok ,the capacitor are ok and resistors too.. i cant understand what's uppened... probabbly the transistors?? can you please send me an electric diagram of the circuit inside so i can check the components dettails?' many thanks best regards

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: Signal light stays on, no sound output

T14 is part of the +15v power supply that feeds the input board.
It is actually a transistor.
If this is the only problem on the board, then this transistor could be resoldered back on but you will have to make sure it tests OK and it attaches to the heatsink the same way it came off. ie make sure it is electrically isolated from the heatsink
It seems if there is no fuses blown on the power amp board you might be one of the lucky ones.
In my opinion this amp is a clever design but is under-engineered for robustness

Posted on Sep 16, 2008

mrwtech
  • 59 Answers

SOURCE: I have a pair of

you have one of two problems.1) the woofer is blown(most likely) or 2) the crossover is fried(rare). Take the woofer out and press on the speaker cone(softly). If there is a scratchy feeling when you move it or if it doesn't move at all, you'll either need a new woofer, or get that one reconed.
good luck.

Posted on Dec 04, 2008

  • 8 Answers

SOURCE: replaceing internal fuse to mackie active sub woofer swa 1501

Hi There, you need to check the 3 fuses that clip onto the main amp board. You can access them by undoing the two screws that are on the top and the bottom of the sub. They have flat large heads and you will need a hex key to unscrew them. If it is one of the fuses that has gone it will either be discoloured as in burnt or you will see the metal inside has split. Simply replace these by pulling out the burnt out fuse and replace with a new fuse and hey presto you should be back up and running. If you need any parts for the sub or fuses then www.LondonSpeakerShop.com will be able to supply them (that is if you're in the UK). Also the offer a service of swapping them over for you if you really don't want to do it yourself. Hope this helps. Grant (from www.LondonSpeakerHire.com)

Posted on Mar 24, 2009

SOURCE: Mackie srm450 not making any sound at all

It sounds like the thermostat didn't shut the speakers down before they were damaged. There is probably a very fine wire leading to the speaker coils which is burned/broken. Fixing this broken connection my solve the problem unless the coil itself is damaged.

Another possibility is that the crossover circuitry in the speaker cabinet is damaged from overheating.

Sounds like you need a service tech to look at the bad speaker, unless you want to tackle the job.

Posted on Apr 22, 2009

  • 4234 Answers

SOURCE: Volume reduction with same input ( 4 years old),

What are you using to feed the sub? Are you sure that the signal level you are presenting to the sub is the same?

Dan

Posted on Jul 31, 2009

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