Many people demand the flexibility and convenience of using multiple speakers throughout the house - even outdoors. If you hook up more than one speaker pair to your amplifier, however, the impedance (ohms) may drop to a dangerously low level, stressing your amp beyond its limits, causing circuitry damage or shutdown. You may avoid this potential nightmare by connecting your speakers to a multiple speaker selector. However, ordinary speaker selectors can also degrade system performance. Although they use a resistor "in series" to protect your amp from low impedance loads, these ordinary inductive resistors can cause noticeable high frequency loss, so you hear less detailed music reproduction. The power rating is often low, potentially damaging your speaker selector if you're using a high current amplifier.