Stereo sound has lots of distortation - Onkyo TX-SR605 Receiver

Depends on what output your stereo is. If you underrate the speakers (speaker watts is less than stereo output), the unit will sound louder for a while, then you end up blowing your speakers with the excess distortion. If you overrate the speakers (speaker watts is higher than stereo output) the speaker will not operate correctly and the distortion can damage it also. Its best to get a close match. Slightly higher is better. It is important you know actual wattage output not PMPO ( Peak music power output) A lot of stereos are rated at PMPO. The higher number sounds great but in reality, the figure is the MAX output and by then the sound is distorting badly. Distortion ruins more speakers than anything else...

We need to know what the amp is and its model, what the speakers are, what the enclosure is.

The problem is in the audio driver or output stage which is normally an ic semiconductor, it is recommended that a technician look at the stereo to assess cost.

I suggest you ensure the ground is made to a sensible ground point and the supplies are also good and the antenna is also properly grounded and then monitor the supply voltage and the current consumed by the radio until it begins to distort. If the voltage and current remain steady the fault is either local interference or inside the radio, probably in the tuner.

If the current climbs and the voltage remains steady the fault is likely in the audio section...

The Canon HV20 mini plug audio input has a very limited useful range, but you should be able to adjust your setup to get acceptable results.
Just on a side note, you can get a wired lavalier mic at Radio Shack for $15 that could make the problem go away, or at least eliminate a lot of electronics ... but the cable will only be about 15 feet long ... you could use an extension, just make sure it's mono.

Couple notes: One is that the mini plug input on the HV20 is a stereo microphone input, and you're plugging in a mono source. This will not cause distortion, but is not ideal ... a simple stereo adapter to break down the input (mono mic into one side of stereo adapter, stereo adapter into camera) would optimize the situation.
Another thing is, you have at least two volume controls that absolutely MUST be adjusted correctly ... hopefully one of these is the problem and soon will be the solution.
I don't know the Sennheiser wireless set in particular, but it probably has a volume control on the receiver box (which might be over by your camera) .. the other is actually IN the camera software ... go through the menus and see if you can select audio input volume and try the "auto" setting, and also try the "manual" setting, and when on manual, turn it down. This is the audio input volume control for the camera itself. It is the level that corresponds to the small level meters you can see in the camera's LCD screen ...
Good luck! You are not alone with these issues ... the beauty of modern video cameras is in their small size, but it's also a problem because you are not provided with proper audio inputs - you have to deal with the stereo mini plug input, which is less than ideal.

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The distorted and low volume output plus noise is usually caused by using the wrong power supply adapter. The Alesis SR-16 takes a 9V "A/C" supply not "DC". The A/C supply provides a negative voltage swing which wouldn't exist with a DC supply. So check and make sure you have 9V A/C output supply not DC.

The hard way, if you have the skill, is to replace the speakers.  The bad news is that this probable won't fix it as it is likely that it is internal noise causing the distortion.

there is an easy solution that will probable work.  Using the audio output connection you could hook it up to a stereo system or boom box and use those for sound.   the only thing technical is making sute your cord has the right connectors/adapters on each end.  take a picutre or a good look at both devices audio connectors (output on the TV, input on the Stereo/boombox) and the salesman at your local electronics store should be able to help you find just what you need.
at a guess you will likely need an RCA female to RCA female cord or an RCA to stereo mini male.

hope this helps.

Long_Knight

it's almost like an antenna so if he lives in apartment or anywhere lots of signals are it will do that i would suggest a line clarifier

Your turntable is a preamp. Your amplifier might be going bad. did you connect it into phono? dont connect it into the cd or dvd input because those wont work.

YOU SHOULD NOT PLAY CD,S IN SURROUND SOUND,SWITCH TO STEREO ONLY FOR CD,S AND OTHER MUSIC SOURCES.
HOPE THIS HELPS.