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Sony - STR-K740P - Low Speaker Volume

I am suddenly getting low / muffled sound on all speakers except for Center and Rear Right. The rest of the speakers sound very low even when the volume is at Max. The two "working" speakers sound fine. I've hooked up the speakers and wires to different jacks and have concluded that it's not the speakers or the wires. Moving them around, they sound fine on the center or rear right channels. I've reset to factory settings, changed levels etc, to no avail.

Any ideas?

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5 Suggested Answers

Duncan
  • 218 Answers

SOURCE: speaker jack not working

Sounds like your right front output transistors/IC may have a problem, not the jacks. Time for a trip to the shop I fear.

Posted on Jan 14, 2007

SOURCE: rear speakers not working on STR-K740P

The only way your surround sound will work is if you have either the coaxial or fiber optic digital hookups attached to a PS3/Blueray/DVD/Cable box/Satellite box that have digital sound outputs. If you are just using the 1970's version of the red/white audio cables that is stero only.

Posted on Apr 11, 2008

tns_davao
  • 32 Answers

SOURCE: my reciever sony str-k740p reads (protect) and it

Grounded speaker wire check your lines going to the speakers

Posted on Jul 10, 2009

dunnbiker
  • 8546 Answers

SOURCE: Sony's STR-DE675 5.1 Channel Receiver - Speaker OFF problem

There's a button that turns the speakers OFF right above the headphone jack.

Get the manual: retrevo.com

Posted on May 21, 2010

Testimonial: "@dunnbiker Very true on assumptions! I've tried everything the manual suggests. Right now, nothing is connected to the unit, but upon power up, I get the SP:OFF display (which is not seen in the DEMO mode). I will try the headphone jiggling idea and see what happens."

rommelalilin
  • 2178 Answers

SOURCE: Cannot hear rear channel on Sony STR-DTE325

First off, you want to correctly isolate what or which channels are/is bad. Use one good known speaker. Connect that speaker, one channel at a time, and test that channel with a fixed volume level (don't adjust the volume when you check each channel). Isolate the low level channels and make note of it. Note: each channel has their own amplifier. Once you've isolated the bad channels, take it to a repair shop and tell them the bad channels. They will then locate the circuit and narrow down the search to fine the problem - it's usually a bad solder connection. If it blows fuses - more likely a shorted transistor. In your case it's a bad solder connection.

Posted on Dec 22, 2010

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