Subwoofer Debacle?

Techlord · 11-04-2009, 12:02 AM

Hello everyone,

I have myself a subwoofer debacle, it all started when I purchased my 52" LCD and new AV rack/TV stand. About three months after everything has been connected I started enjoying my new big display and noticed that my subwoofer just wasn't outputing much of anything, so I tried turning up the SW volume knob and nothing. Then I went into my AV receiver and increased the SW output to plus 12+ db and nothing, so it was time to try another SW cable. All I had was a video cable and I tried it and nothing, is a video cable going to work for a SW cable for testing purposes?

So after that video cable failed to work, I plugged in the original Monster brand SW cable and my SW came on with some real bass!

I'm happy that everything is working now but in the back of my mind I still don't have any reason why my SW quit working, shouldn't the video cable have worked even a little?

Thank you in advance, Techlord.

Loves2Watch · 11-04-2009, 09:22 AM

The video cable should have worked since it, for all intents and purposes is the same as a coax audio cable. I am assuming you are using the single coax cable from the LFE connection (actually pre out sub connection on your receiver) from the receiver to the sub.

Techlord · 11-04-2009, 02:29 PM

Quote:

Originally Posted by Loves2Watch

The video cable should have worked since it, for all intents and purposes is the same as a coax audio cable. I am assuming you are using the single coax cable from the LFE connection (actually pre out sub connection on your receiver) from the receiver to the sub.

Yes I'm using the single coax cable from the LFE pre-out to the left/mono input on the SW, I unplug the SW, moved it and went through the Denon setup for the SW before it started working. I guess I should have had the Denon repair shop check the SW pre-out before I picked it up yesterday, I hate not knowing!

Loves2Watch · 11-04-2009, 03:16 PM

Quote:

Originally Posted by Techlord

Yes I'm using the single coax cable from the LFE pre-out to the left/mono input on the SW, I unplug the SW, moved it and went through the Denon setup for the SW before it started working. I guess I should have had the Denon repair shop check the SW pre-out before I picked it up yesterday, I hate not knowing!

If it is intermittent, you might want to take it back (receiver) for a thorough diagnostic...

gameguru1360 · 11-09-2009, 06:45 PM

originally used just the single rca cable for the LFE input on this Boston Acoustics sub:
http://www.sonicelectronix.com/item_...st-White-.html

the manual said if use the rca to L/R rca cable, then you can use the adjustable frequency knob which is does make a difference when adjusting whether or not I want midbass frequencies or not.

It's not a bad sub for the price and for the 250 rms watt output! I don't care that it's white and my onkyo S4100 is black!

Techlord · 11-09-2009, 10:37 PM

Quote:

Originally Posted by Loves2Watch

If it is intermittent, you might want to take it back (receiver) for a thorough diagnostic...

I think it might be my SW, because when I first got my M&K speaker system I clearly remember whenever I would touch the metal switch for Variable or THX on back of SW I would hear a buzz or hum for as long as I was touching it, now when I touch it there's no buzz or hum anymore?

Would someone know from the symptoms if it is normal?

Thanks Techlord.

Loves2Watch · 11-10-2009, 02:34 PM

Quote:

Originally Posted by Techlord

I think it might be my SW, because when I first got my M&K speaker system I clearly remember whenever I would touch the metal switch for Variable or THX on back of SW I would hear a buzz or hum for as long as I was touching it, now when I touch it there's no buzz or hum anymore?

Would someone know from the symptoms if it is normal?

Thanks Techlord.

Sounds like a short in the sub...

Techlord · 11-10-2009, 03:24 PM

Quote:

Originally Posted by Loves2Watch

Sounds like a short in the sub...

So you think the short was while it buzz and hummed, but now the short isn't well shorted right now? It did start working right after I pulled it out from against the wall, then went into the Denon setup and it starting working. M&K was bought out buy another company in 2007, I wonder is I still have a warranty?

Loves2Watch · 11-11-2009, 05:41 AM

Quote:

Originally Posted by Techlord

So you think the short was while it buzz and hummed, but now the short isn't well shorted right now? It did start working right after I pulled it out from against the wall, then went into the Denon setup and it starting working. M&K was bought out buy another company in 2007, I wonder is I still have a warranty?

I would imagine you still have a warranty. Anyway if the buzzing ceased after pulling the sub away from the wall, could it have been in contact with a piece of molding or something that would cause the buzz. Is the intermittent situation resolved?

Still sounds like a short in the circuitry of the sub to me, without any other info or being there to test/troubleshoot myself...

Techlord · 11-11-2009, 03:45 PM

Quote:

Originally Posted by Loves2Watch

I would imagine you still have a warranty. Anyway if the buzzing ceased after pulling the sub away from the wall, could it have been in contact with a piece of molding or something that would cause the buzz. Is the intermittent situation resolved?

Still sounds like a short in the circuitry of the sub to me, without any other info or being there to test/troubleshoot myself...

It wasn't close enough to be touching anything, it wouldn't hurt to have it checked out by now MK sound.

11-04-2009, 12:02 AM	#1
Techlord High Definition is the definition of life. Join Date: Apr 2009 Location: Orange County, California Posts: 1,110	Subwoofer Debacle? Hello everyone, I have myself a subwoofer debacle, it all started when I purchased my 52" LCD and new AV rack/TV stand. About three months after everything has been connected I started enjoying my new big display and noticed that my subwoofer just wasn't outputing much of anything, so I tried turning up the SW volume knob and nothing. Then I went into my AV receiver and increased the SW output to plus 12+ db and nothing, so it was time to try another SW cable. All I had was a video cable and I tried it and nothing, is a video cable going to work for a SW cable for testing purposes? So after that video cable failed to work, I plugged in the original Monster brand SW cable and my SW came on with some real bass! I'm happy that everything is working now but in the back of my mind I still don't have any reason why my SW quit working, shouldn't the video cable have worked even a little? Thank you in advance, Techlord. __________________ I'll admit when I am wrong, why live in denial? I should have bought a Panasonic Plasma! Samsung LN52B750 240Hz LCD HDTV Oppo Digital BDP-83 Denon AVR-5700 THX Ultra Certified Receiver M&K Sound LCR-750 THX Certified 5.1 Speaker System w/V-1250 THX Powered Subwoofer LCD's viewing angle issues seen here! http://www.youtube.com/watch?v=NOYnAmDLXbY

11-04-2009, 09:22 AM	#2
Loves2Watch SPAM Police Join Date: Aug 2007 Location: AZ, NM, TX, MX Posts: 13,940	The video cable should have worked since it, for all intents and purposes is the same as a coax audio cable. I am assuming you are using the single coax cable from the LFE connection (actually pre out sub connection on your receiver) from the receiver to the sub. __________________ Theater 1 - Panasonic TH-85PF12U Plasma TV, 6 Conrad Johnson LP275M Amps, Anthem Statement D-2 Pre/Pro, 6 Thiel SCS4 Speakers, 2 REL T-1 Subs, Infinity Interlude 120S Sub, Simaudio MOON Orbiter Universal Disc Player, ELP Laser Turntable, 2 Dish Network ViP 622 DVR's, Oppo BDP-83 Blu-ray Player, Onkyo DV-HD805 HD DVD Player. Friends don't let friends buy Korean brand TV's.

11-09-2009, 06:45 PM	#5
gameguru1360 High Definition is the definition of life. Join Date: Jan 2008 Location: Pasadena, CA Posts: 625	originally used just the single rca cable for the LFE input on this Boston Acoustics sub: http://www.sonicelectronix.com/item_...st-White-.html the manual said if use the rca to L/R rca cable, then you can use the adjustable frequency knob which is does make a difference when adjusting whether or not I want midbass frequencies or not. It's not a bad sub for the price and for the 250 rms watt output! I don't care that it's white and my onkyo S4100 is black! __________________ "What I really need is a woman who loves me for my money but doesn't understand math."