Question about Mackie SWA1501 Subwoofer

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Any idea why my Mackie swa1501 bass bin has blown 2 speakers in the last 3 months? Bass Drum is the heaviest instrument going through it, but I never let it clip, I also run a fan on it which keeps it cool. I'm using it with a srm450 and on the other side a swa1501 with an older mackie bass bin.mmmm getting expensive!

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Does your swa1501 get hot just being switched on ?
sounds like your output transistors breaking down or your dc to dc rectifier is shorting this would dumping high voltage to the speaker. I guess your speaker coil is burnt . check Q4,Q5,Q7,Q12.Q14,Q15,Q17 and Q18 these are all mosfet transistors that commonly break down..

Posted on Oct 11, 2009

  • Chickenwatt Sep 14, 2010

    You have to check 2 things
    1- power supply switch that is one irf640 and two irf630, also check 330 ohm resistors and
    zeners aside the big caps
    2- Output transistors that you can meausre in circuit in diode measurement, the two drivers MJE15032 and MJE15033 each one should measure 58 ohm between base and emiter and also check the diodes near the emiter resistors which are 3.3 volts

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Mackie SWA1501 Base Bin - Circuit Boards burnt.


They are not publicly available. Mackie authorized service centers are the only places that will have that information. The amp (if it has failed) requires a bit of skill to rebuild, and up to 100$ in parts alone. (not including the speaker driver if it's blown). I have repaired several of these in the past, and they aren't that simple. There is also a service bulletin about 2 diodes that usually need to be swapped with one another because of a defect during manufacture (the parts were installed incorrectly). (One is D20) if you rebuild the amp, and fail to address the diodes, it will fail again very shortly.

Jun 12, 2009 | Mackie SWA1501 Subwoofer

1 Answer

Mackie srm450 the tops on one speaker is not working


Hi There, This is quite a common problem with the Mackie SRM450's. You will find that you need to replace the diaphram on the top. This can be done by removing the 16 screws from the back of the Mackie (quite a long pain in the **** job) with a long handled cross head screw driver.

Once you have done this you should then remove the hex bolts from the back of the drive where the black and right terminals are. When this is done, pull off the cover and swap the diaphram out. With the new diaphram in place reverse the steps above but before you screw the back on, power it up carefully and check the sound is now working.

If the diaphram keeps going eg every 3 to 4 months then you will need to change the driver which is quite expensive to do. If you need spares and are based in the UK, contact LondonSpeakerShop.com who carry spare parts or can undertake the repair.

Hope this helps.

Feb 22, 2009 | Mackie SWA1501 Subwoofer

1 Answer

Bass pops


Hi There, Have you checked 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 with a new fuse and hey presto you should have eradicated the popping. 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). Hope this helps. Grant (from www.LondonSpeakerHire.com)

Feb 01, 2009 | Mackie SWA1501 Subwoofer

1 Answer

I have a pair of mackie srm 450 and one swa 1501 the bass output in one of the 450s has no sound. i hear sound only from the high frequency part of the speaker


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.

Dec 04, 2008 | Mackie SWA1501 Subwoofer

2 Answers

Round bass


get a bass amplifier and connect to the subwoofer.

Apr 14, 2008 | Mackie SWA1501 Subwoofer

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