HI , i have onkyo HT-s3100 home theater. i would like to replace the front L and R speaker with JBL control 1 speakers. i have a fear in mind. my receiver supports 6 ohms. where as the JBL Contrl 1 is of 4 ohms. pls advice me , if i can go ahead with JBL speakers.

The 2 front speakers need to be connected to 2 big banana plug/screw connection marked Speakers A and not the last 2 color coded Push in style connectors,I had the same issue and this was the fix.Look at the quick setup guide closely,I did not look at it close enuff also.

The speakers and amp are optimized at 6-ohms. Adding speakers will require you to run them in parallel with a possible dangerously low impedance; or in series, doubling the impedance which is safer.

These products are not designed to be modified.

Register and download the manual for free at retrevo.com

http://www.retrevo.com/search?q=Onkyo+Model+HT-S5300

Specs page 58-59.

It's all in the manual:

http://www.retrevo.com/support/Onkyo-HT-S3100-Home-Theater-Systems-manual/id/16697ag806/t/2/

Palaboy is incorrect. JBL Control 1 speakers are 4 Ohm 150 watt speakers. He's probably thinking of the Control 1x speakers which are 8 ohm 80 watt speakers.

If you hook your Control 1s to that Onkyo, it won't sound great and could cause the receiver to overheat and trip the protection circuit if played at high volume.

Double check that the approtiate speakers (A or B ) are selected.

It's possible that you have the wrong speaker set (A or B). Look for that button and change the setting and see if that works

you might want to switch the speakers that youre using. e.g front left put it to front right and vice versa to isolate if the speaker has the issue or the amplifier terminal.
if the left speaker works on the other terminal then its a terminal issue.

Check to make sure that Speaker B is not pushed. It's on the front panel on the bottom left.

You can find manuals for Onkyo products here http://www.onkyousa.com/download/own_manuals.cfm