The only phono preamp in the world designed exclusively for MM/MI cartridges
M³ is the only preamplifier to really make your Moving Magnet or Moving Iron cartridge shine!
Preorder today for € 995.- to ensure early delivery
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Fixed coil cartridges can sound as good or better than top Moving Coil ones. They often don't, because of poor matching with preamplifier and unwanted interaction between cartridge's inductance, cable capacitance and preamplifier loading.

Korf M³ preamplifier removes all these obstacles.
Built only for MM/MI cartridges
Before Korf Audio, most phono preamplifiers were universal. They were designed to work with all types of cartridges: Moving Coil, Moving Magnet, Strain Gauge, with transformers and head amplifiers. Jacks of all trade, and masters of none.

MM/MI cartridges have specific needs when it comes to amplification. These needs were ignored because most preamps are universal

Korf M³ preamplifier changes all that.
Sounds great right out of the box
No need to manually configure anything. No switches to switch, no knobs to turn, no guesswork, no listening 20 times to the same piece of music to decide which setting is just right.

Shall the cartridge be loaded into 47kOhm? 70? 100? 10? 100pF? 200? 400? Doesn't matter. Korf M³ technology ensures that the preamplifier is exactly matched to your cartridge at a press of a button.

First to measure
Korf M³ preamplifier measures cartridge's electrical parameters (inductance and resistance), creates an exactly matching preamplifier just for your cartridge.

Everything is done in analogue domain, the sound is never digitized.

How do other phone preamplifiers know what cartridge they are working with? They don't!
Matches your cartridge exactly
Many new phono stages have an LCD display these days. But having a display doesn't mean that it is a measuring M³ preamplifier. Other companies' preamplifiers use screens to make you choose the arcane settings -- just like it used to be with switches and knobs.

Korf M³ preamplifier uses very small test signal for less that 1 second to measure cartridge electrical parameters and create an exactly matching preamplifier specifically for your cartridge! Then the data is stored in non-volatile memory and recalled every time M³ preamplifier is switched on.

Simple to operate -- just one "M" for "Measure" button, then follow plain text prompts.
A great leap in sound quality
You will be surprised by what your moving magnet cartridge can do. You might be blown away, in fact. Amazed.

Transparency. Air. Shine. Resolution. Bass definition. Most likely, all of these will be improved by upgrading to an M³ preamplifier.
Features
Modern high-quality components
Audio-grade operational amplifiers by Texas Instruments
Precision digitally controlled potentiometers by Analog Devices
1 high-quality pass-through film capacitor per channel
Advanced low-noise power supply
Custom toroidal transformer minimizes electromagnetic noise
Long-life oversized filtering capacitors
New generation ultra low noise regulators by Texas Instruments
Numbers!
Completely separate analogue and digital boards
Digital part completely separate, uses its own transformer winding and power supply.
Everything is done in analogue domain, the sound is never digitized. No digital components in signal path.
Precise measurements
Powerful AVR microcontroller generates test signal, measures cartridge parameters, creates an exactly matching preamplifier.
Compact fully shielded enclosure
Size
18 gauge steel
Anti-vibration feet
Made in Europe
Digital part completely separate, uses its own transformer winding and power supply.
Everything is done in analogue domain, the sound is never digitized. No digital components in signal path.
Advantages:

Transimpedance topology
Modern high-quality components
Advanced low-noise power supply
Completely separate analogue and digital boards
Precise measurements
Compact fully shielded enclosure
Made in Europe


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How to preorder
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You'll get a message when your preamp is ready
When your preamp is manufactured, we will send you a link to the payment page
You have 3 days to claim your preamplifier
Your preamp is shipped
Once your payment clears, we will ship your preamplifier immediately. You will get a confirmation email with a tracking number
Preorder now for € 995.-
Ensure early delivery and lock in today's price. Projected availability November 2018.
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Frequently Asked Questions
Is it compatible with my cartridge?
We are the leading firm by delivering quality and value to our clients. All our professionals have more than 5 years of legal experiences. We like what we do.
Will it work in my country?
What if I don't like it?
Our managers are always ready to answer your questions. You can call us at the weekends and at night. Also you can visit our office for personal consultation.
How does the warranty work?
Our company works according to the principle of individual approach to every client. This method lets us to get success in problems of all levels.
I already have a phono preamp. Why should I get another?
How big and heavy is it?
Everybody knows Moving Coil cartridges are superior. Why bother with MM/MI at all?
Many phono preamps have LCD displays too! Why do you say yours is different?
Many new phono stages have an LCD display. But the screens are only there to make you choose the arcane electrical operating parameters of your cartridge -- just like it used to be with switches and knobs.

M3 preamplifier measures actual electrical parameters of your cartridge. Then the microprocessor uses the data to custom-build a fully analogue preamplifier exactly matched to it. No switches to switch, no knobs to turn, no guesswork, no listening to the same piece of music for 20 times to decide which setting is just right. Korf patented M3 technology ensures that the preamplifier is exactly matched to your cartridge -- at a press of a button!
It's digital, isn't it?
The signal path of an M³ preamplifier is fully analogue. A microcontroller is only used to measure the cartridge parameters once. Then they are stored in non-volatile memory and recalled every time M3 preamplifier is switched on.
How exactly does it work?
M³ is a so-called transimpedance amplifier. While most phono preamplifiers treat the pickup cartridge as a voltage source, M³ uses it as a source of current. This solves all the problems of preamp's input stages interacting with cartridge's inductance and cable capacitance. It also provides for better noise performance and eliminates the electrical resonances in the audible frequency range.

Very few companies used this principle, because the frequency response of a transimpedance stage depends a lot on the source (cartridge's) inductance and resistance. While it is easy to build a custom transimpedance phono preamplifier to match a particular cartridge, it would have to be rebuilt to use a different one.

M³, however, adapts itself to the cartridge. It uses the built-in LR meter to measure inductance and resistance of the actual cartridge attached to it. Then the microcontroller does the necessary calculations, and the parameters of the transimpedance stage are adjusted using high-precision digitally controlled potentiometers. To shorten the signal path even further, M³ uses the cartridge's inductance to form one of the RIAA correction poles.

What are M³'s specifications?
We decided against publishing M³'s electrical specifications, like frequency range, signal-to-noise ratio, linearity etc.

The preamplifier and the pickup cartridge work together as a system. The usual published specifications, such as "matches RIAA curve to +/- 0.5dB" or "has a -100dB SNR" are derived from measurements done without the cartridge. Adding the cartridge would change them drastically. What's more -- each type and model of cartridge would change them differently.

M³ is designed in such a way that it cannot be adequately measured without the cartridge. It forms a part of M³'s RIAA correction circuit. The electrical measurements of M³ with a cartridge attached are not directly comparable to those of our competitors.
I don't understand a thing about resistance, capacitance, inductance etc! Do I really need to know it all to use the M³ preamplifier?
If you can press a button you can use an M³ preamplifier. No specialist knowledge is needed to enjoy it.
Documentation download