noises

Hello, I hope you are good, I have a question for you if you can help me, I have a AUDI A4 1999 B4, I change the radio with new one but when that is in aux&BT mode there is a background noise in speakers and when I driving and gas the sound changing accodingly, Thank you in advance!

Is anyone familiar with, or can help with the Infinity system (with amp) fitted in 2001 Jeep Grand Cherokee? I've installed a Atoto A6 head unit and there is a clicking/interference noise when the 'amp enable turn on' is switched on. If I put the original Jeep radio back in the sound is...

Hello, I am new to these forums and using subwoofers and anything else car audio too. I have a question for those who might be able to help. I have 2 12" Sony Xplods. (1300 Watt each) They are hooked up to a Mitsubishi receiver that I use in my home it works well, hits hard and never overheats...