Question about Mackie SWA1801 Subwoofer

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Hi I have a problem with mackie swa1801, the thermal protect kicks in intermittently even on low volume levels from cold boot, opening her up shows 2 greens LED lit up internally Diode 9 and Diode 12 on the amp board Close inspection shows serious heat damage around the R7 R8 C5 and Q3 area and also around R56 R57 Q18 area also having a loose electronics knowledge and seeing how burn up C5 was (10pF 500v) I suspect the cap if failing hence the intermittentcy I've already read and am out to buy the listed parts of usual suspects any help greatly appreciated and recomended reading for all audio electronic repair many thanks ndotk

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Posted on Jan 02, 2017


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

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SOURCE: The Amp on Mackie SWA 1501 sparked and burned today

The Mackie SWA 1501 subwoofer is one on the best subwoofers but it's a heavy one. I have it since 2007 and have no problems with it, still working. I would recommend to buy the new SWA 2801z. If you're in germany check this site: Mackie Subwoofer in Cologne

Posted on Dec 20, 2009

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SOURCE: the thermal light comes on on my swa1801 and lose

make sure its plugged into a large circuit over 30AMP! Turn down the gain on the back. They can't take too much punishment so turn the bass down on the eq. Get a stronger sub

Posted on Aug 02, 2010

  • 5603 Answers

SOURCE: mackie swa 1801 power amp

You likely have other parts blown as well, but Q3 (MJE15033) AND/OR r8 (1 OHM/0.5 Watt) are blown. I suspect that Q3 has a base-collector short and you will find several of the output transistors are fried as well Q4, Q5, Q15, Q16. I suspect that the Zeners D14, D25 may be blown.

When restarting this, put a 100 Watt lampin series with teh 120 volt power to limit current and avoid destroying freshly repaired parts due to a few bad ones not found.

Posted on Aug 11, 2010

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Ould some one send me a copy of that schematic. I

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--please give your comments..

have a good day

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