Previous Thread
Next Thread
Print Thread
Rate Thread
Page 2 of 3 1 2 3
Re: Humming coming from subwoofer
SirQuack #276868 10/30/09 06:33 PM
Joined: Mar 2009
Posts: 39
D
enthusiast
OP Offline
enthusiast
D
Joined: Mar 2009
Posts: 39
 Originally Posted By: sirquack
Are you familiar with working with circuit boards?


Actually, I studied electrical engineering, but specialized in automation. So I do have a bit of experience with circuits, but not really any with amplifier circuits.

Re: Humming coming from subwoofer
dmbartender #278632 11/11/09 08:28 AM
Joined: Mar 2009
Posts: 39
D
enthusiast
OP Offline
enthusiast
D
Joined: Mar 2009
Posts: 39
Can anyone point out to me what the rectifier and filter capacitors are? I'm curious to try and fix it myself before I have to sell it as somewhat defect.

Re: Humming coming from subwoofer
dmbartender #278635 11/11/09 09:10 AM
Joined: May 2002
Posts: 10,654
shareholder in the making
Offline
shareholder in the making
Joined: May 2002
Posts: 10,654
Well, you already correctly identified the two 6800 uF capacitors(which are the most likely suspects)in a previous post. The rectifier is a grouping of usually four diodes(which aren't clear). But no, there isn't any simple way of determining without diagnostic equipment which are failing.


-----------------------------------

Enjoy the music, not the equipment.


Re: Humming coming from subwoofer
JohnK #278641 11/11/09 11:15 AM
Joined: Mar 2009
Posts: 39
D
enthusiast
OP Offline
enthusiast
D
Joined: Mar 2009
Posts: 39
 Originally Posted By: JohnK
Well, you already correctly identified the two 6800 uF capacitors(which are the most likely suspects)in a previous post. The rectifier is a grouping of usually four diodes(which aren't clear). But no, there isn't any simple way of determining without diagnostic equipment which are failing.


Thanks for your answer JohnK. So you think that the 6800uF caps are responsible for the annoying humming. Are they part of the rectifier circuit? Or do they have a different function?

Thanks!

Re: Humming coming from subwoofer
dmbartender #278679 11/11/09 05:54 PM
Joined: Jan 2004
Posts: 13,849
Likes: 15
shareholder in the making
Offline
shareholder in the making
Joined: Jan 2004
Posts: 13,849
Likes: 15
they are capacitors which store power. I think my Odyssey amps had a total of 120000 uF capacitance so when you need power it is there..


M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85


Re: Humming coming from subwoofer
dmbartender #278804 11/12/09 04:10 AM
Joined: May 2002
Posts: 10,654
shareholder in the making
Offline
shareholder in the making
Joined: May 2002
Posts: 10,654
The rectifier and capacitors perform different functions in the power supply section of the amplifier, but the net result is to provide clean, smooth DC instead of the incoming AC. The rectifier changes the AC which fluctuates between about +/- 170 volts(in N. America)to either a plus or minus DC output which fluctuates from max to zero. The capacitors take this fluctuating DC and store the pulses, then release them in a smooth DC to the amplification section. The result should be inaudible hum and noise when they're operating properly.


-----------------------------------

Enjoy the music, not the equipment.


Re: Humming coming from subwoofer
JohnK #278870 11/12/09 07:43 PM
Joined: Mar 2009
Posts: 39
D
enthusiast
OP Offline
enthusiast
D
Joined: Mar 2009
Posts: 39
Is it common that the smoothing capacitors go kaput on amps that aren't that old yet? I could imagine that happening on a 20 yr old amp, but this one is still relatively new and at least optically in great shape. I wonder if there's another way for the caps to go downhill other than just aging?

Re: Humming coming from subwoofer
dmbartender #285002 01/03/10 02:23 PM
Joined: Feb 2004
Posts: 637
aficionado
Offline
aficionado
Joined: Feb 2004
Posts: 637
Think of it like buying a Ford, new or old they're still $#@## lol
Sorry, if I offended anyone , " Who's driven or bought a Ford lately."

Last edited by troyd; 01/03/10 02:24 PM.

Anthem MRX520
M5HPv4
VP160HPv4
QS10v4

Re: Humming coming from subwoofer
TroyD #285011 01/03/10 03:38 PM
Joined: Sep 2004
Posts: 11,458
shareholder in the making
Offline
shareholder in the making
Joined: Sep 2004
Posts: 11,458
Well, you DO have a way about you, don't you?

No, I've never owned a Ford.... and not for any particular reason.


::::::: No disrespect to Axiom, but my favorite woofer is my yellow lab :::::::
Re: Humming coming from subwoofer
TroyD #285045 01/03/10 07:46 PM
Joined: Dec 2003
Posts: 10,420
J
shareholder in the making
Offline
shareholder in the making
J
Joined: Dec 2003
Posts: 10,420
 Originally Posted By: troyd
Think of it like buying a Ford, new or old they're still $#@## lol
Sorry, if I offended anyone , " Who's driven or bought a Ford lately."
At least Ford is still owned by Ford and not the government ;\)


Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70
Page 2 of 3 1 2 3

Moderated by  alan, Amie, Andrew, axiomadmin, Brent, Debbie, Ian, Jc 

Link Copied to Clipboard

Need Help Graphic

Forum Statistics
Forums16
Topics24,984
Posts442,691
Members15,643
Most Online2,699
Aug 8th, 2024
Top Posters
Ken.C 18,044
pmbuko 16,441
SirQuack 13,849
CV 12,077
MarkSJohnson 11,458
Who's Online Now
0 members (), 595 guests, and 0 robots.
Key: Admin, Global Mod, Mod
Newsletter Signup
Powered by UBB.threads™ PHP Forum Software 7.7.4