I'm not even going to touch the rice involved with this idea, but if you're talking about those neon tubes that blink to the beat of bass, then you much purchase a special neon with the said modulator. You don't hook up your neons, or ANYTHING other than your speakers to your speaker ground/power. If you did that, you're robbing yourself of quality sound. What you do is simply mount these tubes under your dash, seat, whatever, then there may be a sensativity control, then just let them beat to vibration(bass, door slam).