2 jbl speakrs on da bak,,wd presence 4 chanl amp..n a woofer dn knw its modl i gues its cervin vega,,,whch my younger bro got installed in his car...bt wneva i take his ride for spin,,,,as i hit da gas same sound tht comes frm engin comes frm speakrz too...evn if the car is at rest n wheater engine is runin or not,,,tht sound comes,,,its like eeeeeeeeeeee...n varies as da car is driven,,,meant to say k agar speed karo gari ke to it increases n sloww karo to awaz b slow ho jati hai...n even pre se system switch of kar b do,,,bt wneva the key is inserted in da switch n turnd to next point tht sound starts cumin
plzzz help...