一套济南音响系统是由很多个独立的音响单元构成的，例如：调谐器、卡座、均衡器、LD机或VCD机及AV功放等。这些单元都需要插入在220V交流电源插销板上。有人为了方便省事，关机时将插销电源一拔就全都关掉了；开机时也是一开插销就全都通电了。这种方法虽然省事，但却存在着隐患。因为这样操作会产生浪涌电流和反峰电压，这两个冲击往往会损坏音响器材。一些器材的损坏大多是在开机或者关机的一瞬间产生，而并非在正常工作状态时损坏的。
A set of Ji'nan sound system is composed of many independent audio unit, for example: tuner, deck, equalizer, LD or VCD and AV amplifiers. These units are needed to insert in the 220V AC power plug board. Some people in order to facilitate easy, shutdown the latch and pull off all power supply; boot is a open bolt all the power of the. Although this method is easy, but there is a hidden danger. Because this operation will produce surge current and peak reverse voltage, the two impact often damage the audio equipment. Damaged some equipment is produced mostly in an instant startup or shutdown, and is not damaged in the normal working state.
浪涌电流：一部济南音响器材都是由电阻、电容、电感、变压器等元器件所构成。它们在开机前都处在冷状态下。开机时，其电阻阻值小，所以瞬间电流很大，是正常工作电流的2．5-3．5倍。这个电流被称为浪涌电流，其对电路可造成损害。
Surge current: a Ji'nan audio equipment is composed of resistors, capacitors, inductors, transformers and other components. They are in cold condition before starting. Boot, the resistance is small, so the large instantaneous current, is 2.5-3.5 times the normal operating current. This current is called surge current, which can cause damage to the circuit.
反峰电压：电感元件、变压器等单元有一个特性，就是当在电路中加人一个电压或者去掉一个电压时，其单元会产生一个反电动势阻止这个电压的变动。那么当开机一个电压加在电感元件上时，它就产生一个反电动势阻止这个电压的建立，但是电源电压的能量源源不断，所以这个反电动势只是起一个电压阻尼作用，对电路影响不大。但是，在关机时情况就不同了，当关机时，电路中产生一个反电动势没有任何的阻挡，这个电压就是反峰电压，它是正常电压的9倍。虽然它的电流很小，但是电压很高，对设备造成一个冲击。所以每一个济南音响单元的浪涌电流和反峰电压都同时地作用在音响设备就造成了一个大的冲击，容易对设备造成损害。因此，各音响单元最好一个一个地顺序开机和关机。正确的开机顺序是按照音源信号流程的方向开机：依次打开卡座、CD机、LD机或VCD机、调谐器、均衡器，最后开启功率放大器。
Peak inverse voltage: inductor, transformer unit has a characteristic, is when in a circuit with a voltage or a voltage is removed, the unit will generate a counter electromotive force to prevent the voltage changes. So when starting a voltage in inductive element, it will generate a counter electromotive force to prevent the voltage of the power supply voltage, but the energy Everfount, so the back EMF is a voltage damping effect, little influence on circuit. However, in the shutdown is different, when the shutdown, circuit generates a counter electromotive force without any barrier, the voltage is the peak inverse voltage, which is 9 times the normal voltage. Although its current is very small, but very high voltage, resulting in a shock to equipment. So the surge current every Ji'nan audio unit and the peak inverse voltage are also role in audio equipment will cause a big shock, easy to cause damage to the equipment. Therefore, the audio unit preferably one boot and shutdown. Boot order is correct according to the audio signal process on direction: in turn card, CD player, LD or VCD, tuner, equalizer, finally starting the power amplifier.
济南音响 http://www.jnzqyx.com/ 正确的关机顺序是先关掉功放，再关其他设备。
Ji'nan sound correct shutdown order is the first to turn off the power amplifier, and then close the other equipment.
目前，为了使用方便，国外发明有一种延迟式电源插销板。第一组接插口是直接开关插口；第二组接插口，当这一路机器开机时，可延时1s(秒)才接通电源；第三组接插口，当这一路机器开机时，可延时2s（秒）才接通电源；第四组接插口，当这一路机器开机时，可延时3s才接通电源。关机时与此类似，也同样分别在不同时段内关断电源。这样就防止了浪涌电流和反峰电压同时作用在所有设备上而损害音响器材的现象发生。
At present, in order to facilitate the use of foreign invention, a delay type power supply plug board. The first group of socket is directly assembled socket switch socket; second, when the road machine boot, can delay 1s (s) to switch on the power; third connecting socket, when the road machine boot, can delay 2S (s) to switch on the power; fourth connecting socket, when a machine is switched on, a delay time of 3S was switched on. The shutdown is similar, also respectively in different time shut off power supply. This will prevent the occurrence of surge current and peak reverse voltage simultaneously on all devices and damage the audio equipment phenomenon.