With some equipment, re-setting or re-tuning may be needed after a flat battery or a battery replacement. Among DSP amplifiers and smart power amplifiers there are products whose settings or calibration are affected when the power is cut completely. For customers whose vehicles we have worked on, we are happy to discuss an inspection and re-setting, so if you notice no sound or a change in sound quality, please contact us before touching any wiring yourself. If your car has a security system fitted, we also recommend consulting us before any battery work. For crime-prevention reasons, we advise on the detailed procedure individually.