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One, it has to be under warranty if 2 months old....
What you may be doing is just driving the speakers (a lot of sets have tiny ones now) too hard with the bass set up===literally rattle them in their frames----if the set has a connection on rear for external speakers that might be a option.
Some of these sets (check the specs) have a very small audio output circuit under 5 watts and with volume up and bass up sound will be hard in deep bass situations....
A hissing sound indicates the speaker amplifier has no input from the computer sound card, check to make sure the speakers are hooked up to the correct port for audio out to the speaker input, the Audio output to the speaker is the GREEN mini RCA jack on the back of the computer.
Hook a graphic equalizer between the piano and speakers, and turn down all sliders above 8 kHz. Since the highest note of a piano is 4186 Hz (4.186 kHz), you'll still hear all the notes but cut the hiss. If the hiss is coming from the speaker's power amplifier (in which case the equalizer won't help), turn down the speaker volume and turn up the piano volume. Live instruments generally need some doctoring to sound good through high-quality stereo equipment, as they only produce a limited range of frequencies whereas good speakers reproduce a lot more - including hiss.
First of all take a headphones and connect it to the TV and listen the sound.If it is OK the problem is or the cable or the amp.You probably have two RCA connectors on the cable red and white or black for input of the amp.Connect the cable to the tv again and change places of the RCAs (red to white on the amp and white to red).If cracling is now on the left speaker buy a new cable but if its still on the right you have problem with the amp.And you are right if everything is OK it shouldn't be cracling.I hope that this will help you
I would check see if you can hear any hissing coming from the speakers if there's no sound then check to see if this product has output protection fuses and if so see if they are in tact if this doesn't solve the problem you may have dead outputs. If there is hissing coming from the speakers check your audio source to make sure it is feeding sound to your amplifier without looking its hard to say in these case's there's a lot to go wrong