Help monitor audio rxw-12 subwoofer

old_marantz · 08-20-2023, 05:46 PM

I have a monitor audio subwoofer rxw12 that is clicking. Avsforms has a thread on this and I saw someone posted schematics here for it. Since I’m a newbie and no one here in salt lake will work on it, I guess I’m elected.

Supposedly the issue is “ smd type and located on the soldering side of the amplifier board”. Can you experts help me identify which one it might be? And what to order? How difficult to put these in? I’ve replaced caps before but just eyeballing what these resisters might be on the board, they look pretty small.

I saw some utube videos on these resisters so hopefully that will be helpful.

I have 4 of these subs and this is a common issue in them. So I better learn how to fix if I have 4.

https://www.badcaps.net/forum/showth...ighlight=Rxw12

**petehall347** · 08-20-2023, 05:54 PM

post some pics of it and explain the problem better . and a link to the supposed fix .

old_marantz · 08-20-2023, 09:38 PM

https://www.avforums.com/threads/mon...cking.2378009/

old_marantz · 08-20-2023, 09:43 PM

**Per Hansson** · 08-21-2023, 09:12 AM

Post the PCB picture in much higher resolution please.

old_marantz · 08-22-2023, 10:52 PM

Just an fyi I noticed most of the 500w (and other lower wattages) Subwoofers that MA makes all have the same size cabinets and holes for the plate amp. So I contacted them and I just ordered a newer plate amp to go into my cabinet and reuse my speaker. Obviously they sorta tweak these and supposedly add newer features to the newer plate amp. So, for just under $400, you get their latest plate amp that will drop into your existing sub cabinet and reuse speaker. So, just do a little home work and make sure a newer plate amp will work for you.

Just another way to fix you broken MA sub. Ya, more expensive if you don’t have electronic diagnostic skills. But, still much cheaper than their newer 500watt sub at $2200.

I’m about to retire so I’ll keep the old plate amp and try and fix it with my future spare time.

foisamoi · 09-18-2023, 02:16 PM

Hi, from Greece can anyone to help me
I want to know what is the voltage in the circle up left.

dobrykamil · 09-19-2023, 10:02 AM

Quote:

Originally Posted by foisamoi

Hi, from Greece can anyone to help me
I want to know what is the voltage in the circle up left.

Don't remember exact value, but VCP is around 16-17V, so VIB should be a bit less than that.

foisamoi · 09-20-2023, 12:07 AM

Quote:

Originally Posted by dobrykamil

Don't remember exact value, but VCP is around 16-17V, so VIB should be a bit less than that.

thank you very much

foisamoi · 09-21-2023, 08:54 AM

Can you tell me which transformer is in the blue circle?
thank you.

dobrykamil · Yesterday, 10:51 AM

Quote:

Originally Posted by foisamoi

Can you tell me which transformer is in the blue circle?
thank you.

That's the standby psu transformer.

08-20-2023, 05:46 PM	#1
old_marantz New Member Join Date: Aug 2023 City & State: Salt Lake Utah My Country: USA I'm a: Knowledge Seeker Posts: 7	Help monitor audio rxw-12 subwoofer I have a monitor audio subwoofer rxw12 that is clicking. Avsforms has a thread on this and I saw someone posted schematics here for it. Since I’m a newbie and no one here in salt lake will work on it, I guess I’m elected. Supposedly the issue is “ smd type and located on the soldering side of the amplifier board”. Can you experts help me identify which one it might be? And what to order? How difficult to put these in? I’ve replaced caps before but just eyeballing what these resisters might be on the board, they look pretty small. I saw some utube videos on these resisters so hopefully that will be helpful. I have 4 of these subs and this is a common issue in them. So I better learn how to fix if I have 4. https://www.badcaps.net/forum/showth...ighlight=Rxw12 Last edited by old_marantz; 08-20-2023 at 05:49 PM..

08-20-2023, 05:54 PM	#2
petehall347 Badcaps Veteran Join Date: Jan 2015 City & State: worcester My Country: United Kingdom I'm a: Knowledge Seeker Posts: 3,758	Re: Help monitor audio rxw-12 subwoofer post some pics of it and explain the problem better . and a link to the supposed fix .

08-20-2023, 09:38 PM	#3
old_marantz New Member Join Date: Aug 2023 City & State: Salt Lake Utah My Country: USA I'm a: Knowledge Seeker Posts: 7	Re: Help monitor audio rxw-12 subwoofer https://www.avforums.com/threads/mon...cking.2378009/

08-21-2023, 09:12 AM	#5
Per Hansson Super Moderator Join Date: Jul 2005 City & State: ---- My Country: Sweden Line Voltage: 230v 50Hz I'm a: Knowledge Seeker Posts: 5,523	Re: Help monitor audio rxw-12 subwoofer Post the PCB picture in much higher resolution please.

08-22-2023, 10:52 PM	#6
old_marantz New Member Join Date: Aug 2023 City & State: Salt Lake Utah My Country: USA I'm a: Knowledge Seeker Posts: 7	Re: Help monitor audio rxw-12 subwoofer Just an fyi I noticed most of the 500w (and other lower wattages) Subwoofers that MA makes all have the same size cabinets and holes for the plate amp. So I contacted them and I just ordered a newer plate amp to go into my cabinet and reuse my speaker. Obviously they sorta tweak these and supposedly add newer features to the newer plate amp. So, for just under $400, you get their latest plate amp that will drop into your existing sub cabinet and reuse speaker. So, just do a little home work and make sure a newer plate amp will work for you. Just another way to fix you broken MA sub. Ya, more expensive if you don’t have electronic diagnostic skills. But, still much cheaper than their newer 500watt sub at $2200. I’m about to retire so I’ll keep the old plate amp and try and fix it with my future spare time.

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