济南汽车音响改装后汽车音响在发动机没点火一切正常，但是一点火后随着发动机转速越大哨声越大的情况，那么出现这种问题是什么原因呢？

1、济南汽车音响改装http://www.sdcarmusic.com/介绍造成这种现象的真正原因是从主机到低音炮的信号线的地线开路了，或者有些主机的RCA输出的信号地和主机的地线是隔离的，可以用万用表量一下主机外壳和RCA输出插座地是否相通，如果不通你可以将信号线插头的地端直接碰到主机外壳看看，噪声是否没有了，然后用两根柔韧一点的线将信号线插头的地连接到主机外壳上，注意一定要连在主机外壳上，不然接到别的地线还是有一些微弱的噪音。
Jinan car audio conversion introduces the real reason for this phenomenon is from the host to the subwoofer signal lines open ground, or some of the host's RCA output signal ground and the ground is isolated from the host, you can look at the amount with a multimeter host shell and RCA output jacks to whether or not the same, if you can not make sense of the signal cord host shell hit the ground terminal directly to see if there is no noise, and then a little flexible cable with two signal lines connected to the plug host shell, attention must be connected to the host shell, or received other ground still has some faint noise.

2、济南汽车音响改装http://www.sdcarmusic.com/介绍造成这种现象还有一种原因可能是所用的信号线质量太差，过段时间地线自己断开了，这种情况换一套好些的信号线就可以解决了，尽量选择双芯的屏蔽线和双绞线。
Jinan car audio conversion introduces Another reason for this phenomenon may be used by the poor quality of the signal line, ground yourself off over time, and this situation is better for a set of signal lines can be resolved, try to choose dual-core shielded cable and twisted pair.