Each audio system requires amplification. In a standard hi-fi set-up, the loudspeakers are all the time “passive”—which is to say, they don’t produce their very own energy. As a substitute, they have to obtain an amplified audio sign from an exterior supply, aptly referred to as an amplifier, as a way to do their factor. Even in a extra fashionable, self-contained audio system (just like the Sonos Era 100, for instance), the drivers that produce the sound should be amplified as a way to perform—this simply all occurs in a singular field quite than throughout hi-fi separates.
However if you happen to’ve heard about amplifiers, you could have additionally heard about preamplifiers (sometimes called “preamps”) and questioned the place they match into an audio system, and whether or not you want one. Let’s reply these questions, we could?
What Does a Preamp Do?
An audio sign wants loads of consideration earlier than it’s able to be amplified—so in the end the query “what does a preamp do?” broadly incorporates its personal reply. A preamplifier takes care of all the things that must be completed earlier than the audio sign (despatched from the music supply) is amplified and despatched onwards to the system’s speakers.
In a self-contained audio system just like the Sonos speaker, the preamplifier and the amplifier are in the identical enclosure, together with the speaker drivers that truly ship the sound. Even in a extra subtle hi-fi separates setup, the preamplifier a part of proceedings remains to be usually dealt with out of sight, inside the amplifier. Some of these amps are generally known as “built-in amplifiers” and include each preamp and amplifier performance.
Nonetheless, some individuals choose to separate out this performance, which is when chances are you’ll come throughout a preamplifier as its personal piece of apparatus, paired with an influence amplifier. In these instances, the preamplifier permits you to choose the supply of music you’d like to listen to (the bulk have a number of enter choices as a way to help a system with a number of sources), and likewise set and alter the amount.
The preamp additionally ensures the audio sign is at “line degree”—that’s, the usual voltage energy of an audio sign transmitted between elements—and sends it on to be amplified, able to be moved onwards, lastly, to the audio system.
Does an Exterior Preamp Enhance Sound High quality?
Hello-fi orthodoxy says that particular person features in any system must be saved as separate as doable if the very best outcomes are to be achieved. The pondering goes that, by protecting electrical exercise as shielded and self-contained as doable, the audio sign has the very best shot at remaining as pure and uncolored as doable.
By dividing the preamplifier and the amplifier features into separate bins, there must be a discount in electrical noise and interference across the sign in comparison with having all of it crammed right into a single field.
