Audio on front left speaker is very crackly with reduced sound output. Have fault found speakers and cables, fault is definitely the SR7300 Amp. A couple of techo taps on top of unit fixes the fault temporarily.
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Re: One speaker channel is crackly.
There is Definately a Short in the Amp if tapping Fixes it. Could try opening the amp and Inspecting the Back side of the Terminals. You can use a Voltometer and check the Wiring inside. Turn off Power Before doing this!
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Make sure the audio level on the left and right channels are balanced. Check the menu for audio levels to adjust and make sure they are not maladjusted. If all levels are adjusted properly then the volume control or volume control circuity may be at fault.
Follow these steps to connect a powered sub woofer to your receiver:
You typically have two options when connecting a powered sub woofer.
Input (1) on the rear of the sub woofer would be used when connecting
the sub woofer to the receiver using speaker wires. You would then
connect the main speakers to the opposite end, or output or the sub
woofer to the main speakers. Option (2) would be using RCA line level
output jacks, input (2) on the rear panel of the sub woofer directly to
the single sub woofer output on the back of an AV receiver.
With what signal did you try? Maybe your signal source (DVD/TV or radio) didn't contain any sounds for the center channel. Go to the Setup menu, Speaker setup / Manual setup and find there item called "Test tone". It will output a test tone to each speaker individually (you will see on LCD which speaker is being tested at each moment). If you will hear a sound from the center now, there is no issue and center is working fine, just your source didn't contain any sound for the center.
If it doesn't work, then either you have faulty cable, faulty speaker or faulty center output of the receiver. - Try connecting the center speaker to different output of receiver (this will test if speaker is OK). - Try connecting working LEFT speaker to left output with CENTER cable (this will test if cable is OK). - Try connecting working LEFT speaker with working cable to the CENTER output (this will test the output of receiver if OK - but use the Test Tone from Setup).
very basically try swapping over the speaker cables, if this doesnt work i suspect you are in need of a new ouput i.c. these can go if the speaker wires are touched together, unless there is a protection circuit.
How do you have the audio hooked up from the TV set? If its s video or RCA plugs? If it is switch them around and see if it swaps channels that goes out . If it does then the output cable or the jack is bad. If your using an HDMI ir a scart cable. The cable or connections could be bad. Unplug it and reinsert it or while the units on mover it around and see if the audio comes back on.