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I have a KAC721 amp.which has been working fine.Suddenly rear 2 speakers are trying to explode,screeching and loud popping sounds.Connections appear to be good,as is the earth. Any assist would be appreciated.Regards,John. bettjohn@bigpond.com

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---okay now,,,,problem solved,,,,,worn insulation on speaker wires hidden behind interior trim..Thanks anyway all concerned. John.

Posted on Sep 15, 2008

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I will be watching either satellite or movies through my PS3 and the sound will suddenly go out. I"ll get a loud humming sound or static coming through the speakers. After i shut off the reciever...


hi,
may be there was some loose contact in ur receivers rear connections.thts why it produce the loud hum. use good quality inter connects. check is the all connectors are properly inserted or not.
ok

Dec 23, 2010 | Denon AVR-1508 Receiver

2 Answers

Very happy until loss of audio!!


If it affects all inputs and the headphones then it's amplification area has shut down...

No sound from any speaker; light around power switch is red
• Amplifier is in protection mode due to possible short
• Check speaker wire connections for shorts at receiver and speaker ends.

• Amplifier is in protection mode due to internal problems
• Contact your local Harman Kardon service center.


You could try a processor reset:

Processor Reset
In the rare case in which the unit’s operation or the displays
seem abnormal, the cause may involve the erratic
operation of the system’s memory or microprocessor.

To correct this problem, first unplug the unit from the
AC wall outlet and wait at least three minutes. After the
pause, reconnect the AC power cord and check the
unit’s operation. If the system still malfunctions, a system
reset may clear the problem.

To clear the AVR 235’s entire system memory including
tuner presets, output level settings, delay times and
speaker configuration data, press and hold the Tone
Mode Button5buttons for three seconds. The unit
will turn on automatically.

NOTE: Resetting the processor will erase any configuration
settings you have made for speakers, output
levels, surround modes and digital input assignments,
as well as the tuner presets. The unit will be returned
to the factory presets, and all settings for these items
must be reentered.

If the system is still operating incorrectly, there may
have been an electronic discharge or severe AC line
interference that has corrupted the memory or
microprocessor.

If these steps do not solve the problem, consult an
authorized Harman Kardon service center.

Mar 15, 2010 | Harman Kardon AVR 235 Receiver

1 Answer

Onkyo TX-SR705 shuts down suddenly


Onkyo receivers have a safety circuit in them to protect the Amplifier from blowing up:

If you listen closely when it shuts down ( after a loud scene ) there is likely a loud 'Relay Click'..
If this is what is happening you might be able to verify it by turning the volume all the way 'off' and waiting for the circuit ro reset ( releasing the safety relays & returning power to the internal Amplifier ) : you should hear another click, yhen you can bring the volume back up carefully and there will be sound again.

This safety circuit trips when then Onkyo receiver detects an 'Over Current' condition on the
' Power Supply ' that feeds the internal 'Audio Amplifier'..

Generally caused by:

1.
Improper load presented to the Amp outputs ( FL, LR, RL, RR, SUB, CENTER )
If you can ( one at a time ) turn off the SUB, Center, Fronts and Rears: trying to re-create the failure each time while you have one part of your system disabled or having their level turned way down..
You can isolate where the problem is coming from.

- any or all of these speakers being the wrong Impedence ( I.E. 4 Ohms instead of 8 Ohms )
Unless the receiver manual or the sticker near the 'speaker connetor' specifies a range or another value, you should assume 8 Ohms. Your speakers should say on the back of them.

- any of the speakers being connected in parallel ( 2 speakers to a single one speaker output ) .. Two 8 Ohm speakers connected in parallel make a 4 Ohm load to the amplifier.

- If the Suwoofer is Passive ( Not having its own power cord and amplifer ) it has a
Passive Crossover : this crossover can have its own power rating or limitation.. If it is constructed with capacitors that have too low of a working voltage, then they can saturate and the crossover itself can present a load to the amplifier that will case this 'Over Current Shut-Down'..


You user manual should detail this.

Ed

Apr 09, 2009 | Onkyo TX-SR803 Receiver

1 Answer

I only get sound out of 2 front speakers with 5.1.


refer owner manual page 46-51, try different surrounding sound modes.
.

Apr 08, 2009 | Sony STR-DG510 Receiver

2 Answers

Sony STR-SE501 makes popping sound/cuts off


just repaired my se 501 poor solder conections on blue rleays by speaker jacks,also blown center speaker seems there are 2 in it one blew and so did cpacitor running now just hooked up one in center speaker sonds great also stay at 8 ohms setting

Mar 17, 2009 | Sony Audio Players & Recorders

1 Answer

Speakers pop and rear speakers cut out of surround sound


Hi,
your problem is a bad solder connection of the relay linked to the lautspeaker sockets. I had the same problem and googled for the solution. Since I resoldered the pins everything is fine. That problem is well known and happens to a lot of Sony receivers.

I can send you a link with a detailed how-to-do solution with pictures, however it's written in german language. But you can use some online translators.

Here is the link: http://www.bmw-syndikat.de/bmwsyndikatforum/topic.asp?TOPIC_ID=28280&FORUM_ID=20&CAT_ID=9&Forum_Title=Geplaudere&Topic_Title=Problem+Sony+STR-DE445

Ralf (from Germany)

Jan 07, 2009 | Sony STR-DE445 Receiver

1 Answer

Denon AVR 1609 Receiver Zone 2 has no sound


you have to change the power amp assignment to zone 2, you must also have Analog audio connections to the Denon from your devices.
Try this put your remote in the zone 2 mode, select tuner in zone 2 and turn zone 2 volume up to -10

Dec 18, 2008 | Denon AVR588 Receiver

1 Answer

My NAD T763 turns on but no sound comes out of any speakers


HI,
I had the same problem and AH reset did not work. IS there anything else i can do?
Thanks
Adrian

Dec 02, 2008 | NAD T763 Receiver

1 Answer

I was playing guitar through my fender 85 amp and the volume suddenly cut out to almost nothing and I couldn't make it loud again?


The speaker could be blown. Try touching a 9volt battery to the terminals on the speaker. If the speaker makes a popping sound its not blown. The other culprit could be the input jack of the amp. If its soldered directly to the board. The retaining nut may have come loose and the jack wiggle around with the cord tension. resulting in a solder connection breaking at the board. But that usualy will give a ground hum or no sound at all. So im leaning towards a blown speaker. (providing its a solid state amp) If it's a tube amp. it could be that one or more of the power tubes are bad or have a vacuum leak and may need to be replaced. ( you have to replace all the power tubes at the same time and have the amp biased.

Aug 19, 2008 | Audio Players & Recorders

1 Answer

Onkyo 605 Reciever no sound from zone 2 RCAs


did the AS amp ever work properly from the RCA's?

Dec 05, 2007 | Onkyo TX-NR801 Receiver

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