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A preamplifier, also known as a preamp, is often used to enhance the audio signal from a lower-powered source, such as a turntable, before it reaches the amplifier in a stereo system. If you’re connecting a device like a turntable that has a lower signal level, then yes, you would need a preamp. However, many modern receivers have built-in preamps, so you would not need an additional one. It’s important to check the specifications of your receiver to determine if a separate preamp is necessary.