What Is A Preamp? Why Do You Need A Preamp?

Anyone just starting in the world of audio and recording has the same question about preamps. This device is vital for taking advantage of a microphone, electric guitar, or phono turntable.

So, what is a preamplifier? A preamp is an electronic device that converts a weak and low electrical signal into an output signal to a loudspeaker and power amplifier. Its primary purpose is to remove noise or prevent the sound from being distorted.

Read on right now to learn more about the device and whether you should own a particular product!

What Is A Preamp?

Definition of preamps (link)

The main purpose of preamplifiers is to take a weak signal and boost it up to a line level.

From your audio device or microphone, the signal travels to the preamp for increased gain. It then transmits to external devices, like a power amp.

The amplification stage refers to the moment when an amplifier is used in the signal path. The primary purpose of this stage is to increase the volume of the signal. It makes it easier for the next device to pick up the sound.

The downside to every gain stage is that they mix noise into your sound. It creates unnecessary noise and can even overload the input and distort the signal.

The solution that experts suggest is to plug the preamplifier into the beginning of your transmission line.

This device just enhances the sound of the instrument. If you already have a good microphone, add a preamplifier.

One trick for dealing with base bullish phase problems is to keep gains in the spot regularly. To keep the signal constant, keep the input gain just low enough. It also reduces noise and makes the sound clearer.

Should You Get An External Preamplifier?

External preamplifiers are not for beginners or amateurs. The more appropriate option is to go for expensive audio interfaces with built-in preamplifiers.

If you are using a high output self-condenser microphone, this unit does not contribute much to the sound quality.

It is only indispensable with low output dynamic microphones.

What Are The Advantages Of A Dedicated Preamp?

The main use of a preamplifier is to raise an instrument-level or mic-level signal to a line level. Any amplifier will integrate it inside the structure. So, why do you need to purchase a separate device?

There are a few benefits that you can get by purchasing a separate preamplifier.

Preamp with a dynamic microphone (link)

Lower Noise

Usually, the internal preamplifiers have reasonably low noise. However, they are not enough for those who use low output microphones or want to record reticent sources.

For “equivalent input noise,” check the equivalent datasheet:

• -127 dBu is a pretty good noise level, but it's also minimal. Any higher will not yield any improvement over your built-in device.

•  -129 dBu is physically the best noise level.

More Gain

Those built into amplifiers are usually not able to provide gain higher than 60 dB. Meanwhile, some dynamic microphones, like ribbons, require numbers up to 70 dB. Even that number could be more.

Better Sound Quality

Higher gain settings generally result in clearer sound and greater transparency.

Simple preamps usually only have a gain of 40-50 dB. When you can use a dynamic microphone with low output, it may obscure the sound. The complex circuitry of external preamps maintains transparency even at the highest gain settings.

Unique Sound Features

Many people want to buy external preamplifiers for this reason. Not only does it make the sound clearer, but it can also create special effects.

You can only find dusty tube sounds from the 60s or the classic, smooth sound of 70s transistor devices through a preamp.

Additional Benefits

In addition to the basic features, external preamps come with quite a few other features. Some functions include buffer switches, phase inversion, and low cut.

Different Types Of Preamps

There are a few different types of preamps that you should distinguish between getting the correct choice.

A complete electric guitar set (link)

Instrumental Preamps

Instruments, like electric guitars, need a preamp to complete their signal sequence.

The built-in preamplifier amplifies the weak signal from the guitar so that it is line-level. But this is just the beginning. Suitable devices can shape the tone and even remove noise or eliminate distortion.

These add-ons prepare the signal for subsequent effects such as compression and reverb before hitting the power unit and speakers. It is also essential for tone.

Many guitarists even equip them as pedals for more control.

Mic Preamps

Instrumentalists love preamplifiers because they have a lot of freedom in shaping the tone color. It allows them to adjust the highs, lows, and mids for a variety of styles.

Meanwhile, singers want clearer and clearer sound quality.

You'll need some tweaking to get good, precise line levels from your microphone.

Most performers make edits with "gain" control over the preamp, audio interface, or equalizer. Dynamic and condenser mics may need slightly less than the weaker ribbon mics. If you get too much into the condenser microphone, you'll end up with distortion.

The gold standard for microphone preamps is ample "headroom." It is the ability to increase gain without attenuating the signal to distortion.

The DAW audio interface isn't the only one with microphone preamps. If you're a videographer, consider at least a standalone mic preamp.

Phono Preamps

Recording players continue to receive a resurgence in popularity and usage. Unlike iPhones, CDs, or mp3 players that send line-level digital signals, a recorder's signal chain starts as weak as the above devices.

If you want to incorporate a recorder into your home audio system, you do not need a separate phono preamp.

A quality stereo receiver may already have a dedicated phono input with a ready-to-use preamp. But if you're going to be DJing and sending the phono signal to different effects processors, you may need a dedicated phono preamp.

Frequently Asked Questions

FAQs about preamps (link)

What Is The Difference Between An Amplifier And A Preamp?

A preamplifier boosts the signal, while an amplifier has more functions. For example, an amplifier can also mute the signal, change the balance between the channels, add filters and regulators to the audio signal, and more.

What Are The Differences Between A Receiver And Preamp?

As we know, a receiver will come with all the necessary equipment to play audio and video except for speakers and monitors. 

With a preamplifier, you'll need additional equipment. It typically includes a receiver and media player, and speakers.

Final Thoughts

What is a preamp? Hopefully, we have given you the satisfactory and understandable explanation of this device.

It's not necessary for regular listeners. But if you want to take the recording game to the next level, this device is indispensable. They'll deliver crisp, clear, and full-bodied audio output to make tunes more enjoyable.