... Ok, if, you have met one of these circumstances, you MUST try our new product: AUDIO ENHANCEMENT SYSTEM You ... quality, no matter China made, or America made; no matter expensive famous brand, or cheap nameless things. If your car ... face it. Convenient DVD Player Or Good Quality Sound, you can only get one of them.But now, if ... ratio: 90 dB ± 5%Separation: 80 dB ± 5% New one!AUTO AUDIO ENHANCEMENT SYSTEM