Home Theater Questions? Ask a Technician for Answers ASAP
Hello and sorry you're having problems. Are you referring to the Altec Lansing ADA995?
If so, can you please try a couple of tests to help us troubleshoot?
1) Does the whistling sound change with volume (raises when volume is turned up, lowers when turned down)?
2) If you remove the INPUT signal cable to the system, does the whistling go away?
3) How long have you owned this for, and when sis the problem occur?