The Audio Technica AT-VM670xSP is a phono cartridge, the small component that sits at the front end of your turntable and turns the grooves in your record into sound. If you are new to this world, think of the cartridge as the part that reads the record, similar to how a needle on an old record player works, but built to a much higher standard.
Inside that little body is a tiny stylus (the "needle") that traces the wiggles in a record groove. As it moves, magnets inside the cartridge generate a very small electrical signal. That signal travels through your turntable, into an amplifier, and finally out to your speakers as music. Without a cartridge, a turntable cannot make a sound at all, so this really is the heart of the whole setup.
The "SP" in the name is an important clue. This particular model is designed with vintage and older records in mind, which we will explain in the stylus section below.
Where does it fit in my system?
The AT-VM670xSP sits at the very beginning of the signal chain, mounted on the end of your turntable's tonearm. The tonearm is the long arm that swings across your record. The cartridge attaches to the front of it, and the stylus rides in the groove.
From there, the tiny signal it produces flows to a phono stage (sometimes called a phono preamp), which boosts and shapes the signal so a regular amplifier can use it. Some amplifiers and turntables have a phono stage built in, and others need a separate one. Once through the phono stage, the sound goes to your amplifier and speakers. The cartridge is small, but everything downstream depends on the quality of what it captures first.
The Design and How It Works
What does "VM (dual magnet) moving magnet" mean?
It means this cartridge uses two small magnets arranged in a V shape to read the two channels of a stereo record. Records carry left and right channel information on the two walls of a single groove. Audio Technica's VM design positions a magnet for each channel in a way that mirrors how the sound was originally cut into the record.
The broader family is called "moving magnet," which describes how it makes electricity. The magnets move with the stylus while the coils stay still. Moving magnet cartridges are popular with newcomers because they are forgiving, reliable, and easy to live with. This VM approach is Audio Technica's own refined take on that proven idea.
What kind of stylus does it have, and why does that matter?
It has a 3 mil (0.0025 inch) conical stylus, and this is the defining feature of this model. A conical stylus has a rounded tip, which is the simplest and most robust shape. The 3 mil measurement refers to the size of that tip.
Here is the key point. A standard modern record uses grooves suited to a smaller stylus, but many older and vintage pressings, along with certain mono and shellac era style records, have wider grooves. The larger 3 mil conical tip is shaped to sit correctly in those wider grooves. That is what the "SP" designation signals. If your collection leans toward older or specialty records with wider grooves, this cartridge is built for exactly that job.
What is the cantilever and what is it made of?
The cantilever is the thin arm that holds the stylus and passes its movement back to the magnets, and in this cartridge it is made of aluminum. When the stylus wiggles in the groove, the cantilever transmits that motion inside the cartridge so the magnets can create the signal.
Aluminum is a classic, well proven choice. It is light enough to respond quickly to the groove and strong enough to stay stable over time, which is exactly the balance you want in a dependable cartridge.
How does it attach to my turntable?
It uses a half inch standard mount, which is the most common mounting system in the world. This means two small screws spaced at the industry standard distance hold the cartridge to your tonearm or headshell. Because it follows this standard, the AT-VM670xSP fits a very wide range of turntables that accept a standard cartridge, rather than being locked to one specific brand.
The Key Specifications in Plain Terms
What does the frequency response of 20 Hz to 20 kHz mean for listening?
It means the cartridge is designed to reproduce the full range of sound that human ears can typically hear, from deep bass to high treble. The number 20 Hz represents the lowest, rumbling bass notes, and 20 kHz represents the highest, airy details like cymbals and the shimmer in a voice. In everyday listening, this tells you the cartridge aims to give you the whole musical picture rather than just part of it.
What does the 20 dB horizontal to vertical output ratio mean?
This is a mono cartridge for coarse groove and 78 rpm records, so Audio Technica does not publish a channel separation figure for it. The relevant specification is a horizontal to vertical output ratio of 20 dB at 1 kHz. Coarse groove records are cut laterally, side to side, while most of the noise on a worn shellac disc comes from vertical movement. A cartridge that responds strongly to lateral motion and weakly to vertical motion therefore lifts the music up out of the surface noise, and that ratio measures how effectively it does so.
What does the output voltage of 4.7 mV tell me?
It tells you how strong a signal the cartridge sends out, and 4.7 mV (measured at 1 kHz, 5 cm/sec) is a healthy, generous level for a moving magnet cartridge. A strong output like this pairs easily with standard moving magnet phono stages and helps keep background noise low relative to the music. In practice, it makes the cartridge easy to set up and get good results from.
What is tracking force, and what should I set it to?
Tracking force is how firmly the stylus presses down into the record groove, and Audio Technica recommends 5.0 g for this cartridge, within an allowable range of 4.5 to 5.5 g. You set this using the counterweight on your tonearm. Too little force and the stylus can skip or lose detail, too much and you add unnecessary wear. Sticking near the recommended 5.0 g gives you secure, stable tracking, which suits the wider grooves this cartridge is built to play.
What do the load and coil specifications mean for setup?
These numbers describe the ideal electrical conditions for the cartridge, and the two most useful for setup are the recommended load resistance of 47k ohms and load capacitance of 150 to 250 pF. Most standard moving magnet phono stages already provide the 47k ohms figure by default, so this cartridge slots right in. The remaining figures, coil impedance of 3.3k ohms, DC resistance of 485 ohms, and coil inductance of 240 mH (all at 1 kHz), describe the internal electrical character of the cartridge. You do not need to adjust these yourself, but they confirm it is designed to behave predictably with typical equipment.
Why Audio Technica, and Who It Is For
Why does Audio Technica build quality matter here?
It matters because Audio Technica has decades of experience making cartridges, and that consistency shows up in how dependable and easy to use their products are. They design and build these components with careful attention to the small mechanical details that a cartridge lives or dies by, from the alignment of the magnets to the standard mounting that makes installation straightforward. For someone new, that reliability removes a lot of guesswork.
Who is the AT-VM670xSP right for?
It is right for anyone who plays older, vintage, or wider groove records and wants a cartridge purpose built for that job. Because of its 3 mil conical stylus, it is not the everyday choice for standard modern pressings, but it excels where those grooves are wider than usual. If your collection includes special or vintage discs, or you simply want the correct tool for that kind of listening, this Audio Technica cartridge is designed exactly for you.
