A phono preamp is an essential part of most vinyl playback systems. It takes the small electrical signal produced by a turntable’s cartridge, amplifies it to a standard line-level signal, and applies the equalization needed to make records sound as intended.
The good news is that you may already have one. Many turntables include a built-in phono preamp, and some stereo receivers, amplifiers and powered speakers have one too.
Before buying another component, check your existing equipment. This guide explains what a phono preamp does, how to identify one, and how to connect everything correctly.
The Two-Question Test: Do You Need a Phono Preamp?
You can usually determine whether you need a separate phono preamp by checking two things.
Question 1: Does Your Turntable Have a Built-In Phono Preamp?
Check the specifications or rear panel of your turntable.
Look for:
- A built-in phono preamp listed in the specifications.
- A switch labeled PHONO/LINE.
- An output mode labeled LINE or PHONO.
If your turntable has a built-in preamp and it is switched to LINE, it already produces the signal needed for a standard AUX, CD or LINE input.
If the switch is set to PHONO, the internal preamp is bypassed. The turntable will need a compatible PHONO input or an external phono preamp.
Not every turntable has a switch, so check the manufacturer’s manual if you’re unsure.
Question 2: Does Your Receiver, Amplifier or Speaker Have a PHONO Input?
Look at the input connections on your receiver, amplifier or powered speakers.
A dedicated input labeled PHONO usually means the device has a built-in phono preamp.
You may also find a nearby grounding terminal labeled GND, although the presence of a grounding terminal alone does not confirm that a phono preamp is built in.
If your equipment has a PHONO input, you can connect a turntable’s raw PHONO output directly to it, provided the cartridge type is compatible.
Understanding the Results
| Turntable | Receiver or speakers | What to do |
|---|---|---|
| Built-in preamp | No PHONO input | Set turntable to LINE and connect to AUX, CD or LINE |
| No built-in preamp | Has PHONO input | Connect turntable to PHONO input |
| No built-in preamp | No PHONO input | Add an external phono preamp |
| Built-in preamp | Has PHONO input | Choose one phono preamp and connect to the matching input |
Important: If both devices have a phono preamp, you do not need to use both. For example, set your turntable to LINE and connect it to a standard line-level input instead of the receiver’s PHONO input.
If neither device has a phono preamp, an external unit is required.
Why Do Turntables Need a Phono Preamp?
A phono preamp performs two important jobs: signal amplification and RIAA equalization.
1. Amplifying the Weak Turntable Signal
A conventional turntable cartridge produces a very small electrical signal, typically measured in millivolts.
This is considerably weaker than the line-level signal produced by devices such as CD players and many other audio sources.
A standard AUX or LINE input is not designed to amplify a raw cartridge signal properly. Without a phono preamp, the music will usually be extremely quiet.
The phono preamp boosts the signal to a level that your amplifier, receiver or powered speakers can use.
2. Applying RIAA Equalization
The second job is just as important.
When vinyl records are manufactured, the audio signal is equalized before it is cut into the record. Bass frequencies are reduced and higher frequencies are boosted.
This process is part of the RIAA recording standard. It helps manage groove space and playback limitations during record production.
During playback, the phono preamp applies the reverse equalization curve, restoring the intended tonal balance.
Without this correction, records sound noticeably different from their intended presentation, with weak bass and exaggerated treble.
A phono preamp therefore does more than make the signal louder. It makes the signal suitable for normal music playback.
Built-In vs. Standalone Phono Preamp
There are two common ways to provide phono preamplification: using a built-in unit or connecting a separate external component.
Both perform the same essential functions, but they differ in convenience, features and upgrade flexibility.
Built-In Phono Preamp
A built-in phono preamp is integrated into the turntable, receiver, amplifier or sometimes powered speakers.
Many beginner turntables include one, making it possible to connect directly to standard line-level inputs.
Advantages:
- No additional equipment to purchase.
- Fewer cables and connections.
- Simple setup for beginners.
- Convenient for compact audio systems.
Disadvantages:
- Limited adjustment options on many models.
- Performance depends on the design and implementation.
- Cannot always be upgraded independently of the turntable.
Standalone Phono Preamp
A standalone phono preamp is a separate device connected between the turntable and the amplifier or powered speakers.
It is useful when neither your turntable nor your destination equipment has a built-in phono stage.
It can also be an upgrade option if you want different cartridge compatibility, adjustable gain or loading, or additional connection features.
Advantages:
- Can be upgraded independently.
- Some models support both MM and MC cartridges.
- Certain models offer adjustable gain, capacitance and impedance.
- Can be moved between compatible audio systems.
Disadvantages:
- Additional purchase and cables.
- Requires its own power supply in most cases.
- Takes up additional space.
- A more expensive unit does not automatically guarantee better sound.
Is an External Phono Preamp Always Better?
No. A standalone phono preamp is not automatically better than a built-in one.
The quality of the circuit, noise performance, RIAA accuracy, cartridge compatibility and system matching all matter.
A good external unit can improve a system when the existing phono stage is limited, noisy or incompatible with a particular cartridge. However, if your built-in preamp already performs well and provides the connections you need, there may be little reason to replace it.
Think of an external phono preamp as an optional upgrade or a solution to a connection problem, rather than something every vinyl owner needs.
Our Picks If You Need an External Phono Preamp
If your turntable and receiver both lack a phono stage, a standalone unit is the solution.
Here are a few options to consider, depending on your system and budget.
Behringer PP400: Simple Budget Option
This is a compact, straightforward phono preamp designed for standard magnetic cartridges.
It provides stereo RCA inputs and outputs, plus a ¼-inch TRS output. It is intended for basic connections to an amplifier, mixer or powered speaker system.
Best suited for: Someone who needs an affordable, basic MM phono preamp without additional adjustment features.
Schiit Mani 2: More Adjustment Options
This offers support for moving-magnet and moving-coil cartridges, with selectable gain settings and adjustable loading.
It provides more flexibility than a basic MM-only unit, particularly if you plan to experiment with different cartridges.
Best suited for: Vinyl listeners who want more control over cartridge matching and future upgrades.
Pro-Ject Phono Box S2: Flexible MM and MC Support
This supports both MM and MC cartridges and offers adjustable gain, input impedance and capacitance.
It is a useful option for systems where cartridge compatibility and configuration flexibility are important.
Best suited for: Users planning cartridge upgrades or wanting more control over phono-stage settings.
For a wider comparison, see our complete guide to the best phono preamps.
How to Connect an External Phono Preamp
If your turntable doesn’t have a built-in preamp and your amplifier or speakers don’t have a PHONO input, the connection is straightforward.
Signal path:
Turntable (PHONO output) → External phono preamp (LINE output) → Amplifier or powered speakers (LINE input)
Follow these steps:
- Connect the turntable’s RCA output cables to the phono preamp’s RCA input.
- Connect the turntable’s ground wire to the preamp’s GND terminal, if provided.
- Connect the preamp’s RCA output to an AUX, CD or LINE input on your amplifier or powered speakers.
- Connect the phono preamp to its power supply.
- Turn on the system and select the correct input on your amplifier or speakers.
Make sure the turntable’s internal phono preamp is bypassed or switched to PHONO when using an external phono preamp.
If your turntable has a built-in preamp that you want to use instead, set it to LINE and connect directly to a line-level input.
MM vs. MC: Does Cartridge Type Matter?
Not every phono preamp supports every cartridge type.
The two main cartridge technologies are Moving Magnet (MM) and Moving Coil (MC).
Moving Magnet (MM)
MM cartridges are common in beginner and intermediate turntables. They typically produce a relatively strong output signal and work with standard MM phono inputs.
Moving Coil (MC)
MC cartridges use a different internal design. Low-output MC cartridges produce a weaker signal and require a compatible MC phono stage or another suitable amplification solution.
Some phono preamps support both types, while basic models may support MM only.
Before purchasing an external preamp, check which cartridge your turntable uses and confirm that the preamp supports it.
For a deeper explanation, read our guide to Moving Magnet vs. Moving Coil cartridges.
Frequently Asked Questions
What happens if I don’t use a phono preamp?
If your turntable produces a raw PHONO signal and you connect it directly to a standard AUX or LINE input, the music will usually sound extremely quiet and lack bass.
The RIAA equalization will also be missing, resulting in an incorrect tonal balance.
However, if your turntable already has a built-in preamp switched to LINE, you do not need another one.
Can a phono preamp damage my turntable or speakers?
Using a correctly connected phono preamp should not damage your equipment.
The main connection mistake to avoid is sending a LINE-level signal into a PHONO input. This can cause excessive amplification and distortion.
If your turntable has a PHONO/LINE switch, make sure its setting matches the input you are using.
Is a phono preamp the same as an amplifier?
No. They perform different jobs.
A phono preamp amplifies the cartridge’s weak signal and applies RIAA equalization to produce a line-level signal.
A power amplifier increases that signal enough to drive passive speakers.
Some products combine multiple functions, but a phono preamp alone is not normally capable of powering passive speakers.
Can I connect a turntable directly to powered speakers?
Yes, if the turntable has a built-in phono preamp switched to LINE and the speakers accept a compatible line-level input.
If neither the turntable nor speakers have a phono preamp, you will need an external unit between them.
See our guide to connecting a turntable to powered speakers.
Do Bluetooth turntables need a phono preamp?
It depends on the turntable.
Some Bluetooth turntables include a built-in phono preamp and process the signal before transmitting it wirelessly.
Others may require a separate phono stage or use a different internal signal path. Check the manufacturer’s specifications rather than assuming Bluetooth automatically means a phono preamp is included.
Can I use two phono preamps in the same system?
You should normally use only one phono preamp in the signal chain.
For example, if your turntable’s built-in preamp is switched to LINE, connect it to AUX or LINE on your receiver. Do not connect that LINE output to the receiver’s PHONO input.
Using two phono stages in series applies amplification and equalization twice, which usually results in excessive volume and distorted sound.
Final Verdict: Do You Need a Phono Preamp?
Every conventional magnetic-cartridge vinyl system needs a suitable phono preamp somewhere in its signal chain.
However, that does not mean you need to purchase a separate one.
Check your turntable first, then check your receiver, amplifier or powered speakers. If one of them already provides a compatible phono stage, you are covered.
If neither does, an external phono preamp is the missing component.
The most important thing is to match PHONO and LINE connections correctly, use a preamp compatible with your cartridge, and avoid running two phono stages in series.