The Matrix N-series looks like desktop gear. The boxes are short, they stack on a corner of a desk, and the first time you see them you assume they're for a headphone setup and nothing more. That assumption is wrong, and it's the most interesting thing about them. What Matrix has actually built here is a complete reference front end, a transport, a DAC, and a preamp, in a footprint small enough for a desk and capable enough to run a real loudspeaker system. We've watched Matrix climb from "the company you buy a good DAC from" to a company you can hand your entire source chain to. The N-series is where that shift becomes obvious.
What the N-series actually is
The N-series is Matrix's smaller form factor. Where the flagship M-series gear is full-width, about 17 inches (430mm) across, the N-series boxes measure 13 inches (330mm) wide and just under 4 inches (97mm) tall, designed to sit together as a stack. There are three core pieces: the NT-1 transport, the ND-1 DAC, and the NA-1 headphone amplifier and preamp. There's also the SI-1 network isolator, which is a supporting piece rather than part of the signal chain.
The thing to understand up front is that these are separates, not an all-in-one with a headphone jack. Each box does one job and does it without compromise, the way a full-size separates rack does. The difference is the size, not the ambition. You can run the whole stack on a desk, or you can spread it across a shelf in a main system. Either way the performance is the same.
Start with the source: the NT-1 transport
The NT-1 is a transport only. It has no DAC, and that is the point. Its entire job is to pull a perfect digital signal off your network or a local drive and hand it to a DAC without adding anything. When a box stops trying to do conversion and amplification too, it can put all of its engineering into getting the bits right.
It gives you five digital outputs: coaxial, optical, AES/EBU, a dedicated USB output, and I2S. That covers any DAC you would want to pair it with, and it means the NT-1 will outlive whatever converter you put after it. It inherits the clock system from the flagship models and adds a 10MHz external clock input, so you can sync it to a master clock later if you go down that road.
Two features tell you Matrix was thinking about noise. There's an SFP port for a fiber-optic network connection, which electrically isolates the transport from the rest of your network. And there's an internal M.2 NVMe slot for up to 4TB of local storage, so you can rip CDs straight to the unit over its dual USB 3.0 ports and run a silent local library instead of streaming everything. At $3,999 it's a serious source, and it's the foundation the rest of the stack sits on.
Which output should you use?
Here's the order we'd follow. Run AES/EBU first if your DAC has it. It's the most solid connection and it takes a properly shielded cable that keeps added noise out. Then coaxial, then optical, then USB. USB is genuinely useful and convenient, but of the digital connections it tends to be the noisiest, a holdover from the days when asynchronous USB was the exciting new way to share a clock. With the NT-1 feeding the ND-1, we'd reach for AES/EBU or coax and not think about it again.
The ND-1 is a DAC with two voices
The ND-1 is the piece we'd point to first. Most DACs give you one sound and you live with it. The ND-1 gives you two, and you pick.
Two outputs, two voices
There's a switch on the output stage. Run the signal through the Lundahl transformers and you get a warmer, rounder, more analog presentation, the kind of sound people chase tubes for. Flip to the op-amp output and you get something faster and more immediate, cleaner on top, more resolving. It's the same converter underneath, but you're choosing how it hands the music off. If your speakers or headphones lean clinical, the transformer side puts the warmth back. If you want maximum speed and detail, the op-amp side gives it to you. That is a real, audible choice you make from the front panel, not a marketing toggle. The op-amp output runs 2.25V on RCA and 4.5V on XLR, and you can set it fixed or variable, so the ND-1 can drive a power amp or active speakers directly if you don't have a preamp.
The AKM 1+2 converter array
Underneath, the converter is AKM's current flagship arrangement: an AK4191 modulator feeding two AK4499EX chips, one per channel. The AK4191 handles the digital filtering and modulation, then hands off to a dedicated DAC chip for the left channel and another for the right. Splitting the channels onto their own converters tightens up channel separation and keeps the phase honest, which you hear as a more locked-in, properly placed soundstage. It runs a femtosecond clock with a DPLL circuit borrowed from the flagship MS-1, and it takes the same 10MHz external clock input as the NT-1. At $2,999, the switchable output alone makes it worth a listen against DACs that cost more and only do one thing.
The NA-1: a Class A amp that's also a preamp
On paper the NA-1 is a headphone amplifier. In practice it's two components in one box, and that's what makes it the quiet hero of the stack.
Pure Class A, fully balanced
The NA-1 is pure Class A, fully discrete, with four independent amplification channels for true balanced drive. That gets you 20 watts of Class A power, around 18 watts per channel into a 33-ohm load off a 60-volt rail, which is a lot of clean current for a headphone amp. The practical result is that it will drive just about any headphone you own, from sensitive in-ears to the hard-to-drive planars, without running out of grip. The only exception is the electrostatic sets that need their own dedicated supply. Backing all of that is an 80-watt toroidal transformer and a 39,000 microfarad capacitor bank, which is the kind of reserve you usually see in an integrated amp, not a headphone box. There's an ALPS potentiometer on the volume, so it stays clean at any level, and a single multifunction button that mutes with a tap and adjusts gain when you hold it.
The built-in preamp
The NA-1 has a real preamp built in, with its own outputs and independent gain settings for the headphone and preamp stages. So it's not only the end of a headphone chain. Run its outputs into a power amp or a pair of powered speakers and the NA-1 becomes the preamp at the heart of a full system. Headphones at the desk by day, loudspeakers in the room when you want them, same box. It has 6.35mm, 4.4mm balanced, and XLR headphone outputs, so it connects to whatever you have. At $2,499 it's doing two jobs at once.
The engineering they share
The N-series boxes look different and do different jobs, but they're built on the same handful of ideas. Those shared ideas are what give the line its sound.
Dual femtosecond clocks
Every box in the line runs dual femtosecond clocks. A clock's job is timing, and timing errors show up as jitter, the tiny smearing that makes digital sound hard and flat. Femtosecond-grade clocks keep the timing tight enough that the jitter falls below what matters, which is why even the SI-1 network isolator has its own clock inside. The ND-1 and NT-1 go further and accept an external 10MHz master clock if you want to lock the whole stack to one reference later.
LDO power supplies, and why everything is aluminum
Matrix builds its supplies around multiple LDOs, low-dropout regulators. An LDO is a simpler, smaller regulator that strips out switching noise better than the usual approach, and clean power is most of what separates good digital from great digital. The catch is that a good LDO runs hot. That's the reason these boxes are cast aluminum with cooling fins rather than folded steel. The chassis is a heatsink. It's a small detail that tells you the engineering drove the industrial design, not the other way around.
MA-DAMPER isolation feet
The newest pieces sit on MA-DAMPER feet, developed with a company called Audio Bastion. Resonance is just another form of noise, mechanical instead of electrical, and a box that vibrates passes some of that into the signal. The damped feet keep external vibration out and let the cabinet stay inert. You can still add your own isolation if you're deep into that, but with the ND-1 and NA-1 it's far less necessary than it used to be.
How the N-series scales from headphones to loudspeakers
This is the part that gets lost when people file the N-series under "desktop." Because the ND-1 can run a variable output and the NA-1 has a preamp built in, the same three boxes that make a desktop headphone rig also make the front end of a loudspeaker system.
Start small: an ND-1 and an NA-1 on your desk with a good set of headphones. Want to stream? Add the NT-1 in front. Ready to fill a room? Take the preamp output of the NA-1 (or the variable output of the ND-1) into a power amplifier or a pair of active speakers, and the desktop stack is now driving your main system. You're not buying different gear when your needs grow. You're pointing the same gear at bigger speakers. For a lot of listeners who start with headphones and later want a room system, that path is the whole appeal.
Where does the SI-1 fit?
The SI-1 is a network isolator, and it solves a specific problem: the electrical noise your router and switches dump onto the network line. It's a small cast-aluminum box that converts the incoming copper ethernet signal to fiber optic and back, packets in and packets out, and that break in the copper path is what blocks the noise, helps with grounding, and stops a surge from traveling down the cable into your gear.
Placement matters more than people expect. You don't put it in front of a switch that fans out to everything. You put it at the very end of the chain, right in front of the one device you care about, like your streamer, so it cleans up whatever noise the rest of the network added before it reaches the music. Then use a well-shielded cable on the far side. One thing worth knowing: the NT-1 already has an SFP fiber port, so if you run fiber into the transport you've got that isolation built in. The SI-1 is for the systems that are still on copper, or for cleaning up a second device that doesn't have its own fiber input. At $699 it's the cheapest meaningful upgrade in the lineup if you're running an older router or the box your internet provider handed you.
NT-1 vs ND-1 vs NA-1: the stack at a glance
Here's the front end side by side. Each box stands on its own, but together they're a complete source chain.
The SI-1 network isolator ($699) sits outside this table because it's not part of the signal chain. It's another worthwhile add-on for a lower noise floor, cleaning up the network that feeds the NT-1, the same kind of help an audio-grade network switch like the SS-1 or SS-1 PRO gives the rest of your system.
N-series or M-series: which should you get?
The short version: the N-series is the smaller, scalable, still-reference option, and the M-series is the full-size flagship. The M-series spreads the same jobs across bigger, full-width 17-inch boxes with larger power supplies and more electronics inside, each piece built without a single concession to size. That's the flagship line: the MS-1 streamer at $9,999, the MP-1 preamp at $6,999, and the MA-1 power amp at $8,999. The N-series gives up some of that scale for a footprint you can actually live with on a desk or a shelf, without giving up the converter quality, the clocking, or the build. The ND-1 borrows its femtosecond clock and DPLL circuit straight from the MS-1, which tells you how much of the flagship's core lives in the smaller box.
So what does the extra money buy? Scale, mostly. The M-series gives each function its own larger chassis and a bigger power supply, and that's where the last increment of performance comes from once the core engineering is already this good. To put it in perspective, for roughly what the entire three-box N-series front end costs, you're into a single M-series flagship box. If you want the absolute most Matrix makes and space is no object, that's the M-series, and you can see the whole line on the Matrix Audio collection page. If you want reference-grade digital that starts as a headphone system and grows into a loudspeaker front end, the N-series is the smarter buy. For most of the people we talk to, that scalability is worth more than the last few percent the flagship gives you.
Building the stack: which pieces do you need?
You don't have to buy all of it at once, and you don't have to buy all of it ever. Here's how we'd think about it.
If you're a headphone listener first, start with the ND-1 and the NA-1. Add the NT-1 when you want serious streaming and local storage as your source. If you already have a system and just want a better DAC, the ND-1 works on its own, variable output straight into your amp. If you're building a room system from scratch, the NT-1 into the ND-1 into the NA-1 as preamp, then out to a power amp, is a complete, properly engineered front end. The full three-box stack lands right around $9,500, and every box in it also earns its place on its own.
If you want the stack to look as good as it sounds, the gear in the photos is sitting on Matrix's own Tempo DX audio rack, built to hold the N-series boxes and starting at $249.
Common questions about the Matrix N-series
Does the NT-1 have a DAC? No. The NT-1 is a transport only. It outputs a digital signal and needs a DAC after it, which is exactly what the ND-1 is for. That separation is deliberate and is part of why it sounds as good as it does.
Can I use the ND-1 on its own? Yes. The ND-1 is a standalone DAC. It takes coax, optical, AES/EBU, I2S, and USB, so it works with any source, and its variable output can drive a power amp or active speakers directly if you don't have a preamp.
What's the difference between the ND-1's transformer and op-amp outputs? The transformer output runs through Lundahl transformers for a warmer, more analog sound. The op-amp output is faster and more resolving. It's a front-panel switch, so you can match the sound to your speakers, your headphones, or the recording.
Which digital cable should I run from the NT-1 to the ND-1? We'd use AES/EBU first, then coaxial, then optical, then USB. AES/EBU is the most solid connection and takes a well-shielded cable. USB works fine but tends to be the noisiest of the digital options.
Can the NA-1 drive a full speaker system, not just headphones? Yes. The NA-1 has a real preamp built in with its own outputs. Run it into a power amp or a set of powered speakers and it becomes the preamp for a loudspeaker system, while still working as a Class A headphone amp.
Do I need the SI-1? Only if you want it. It's a network isolator that cleans up noise from routers and switches. If you're already running fiber into the NT-1's SFP port you've got that isolation built in. If you're on copper from an older router, the SI-1 is an easy, low-cost improvement.
How much is the full N-series stack? The NT-1 is $3,999, the ND-1 is $2,999, and the NA-1 is $2,499, so a complete three-box stack is around $9,500. The SI-1 network isolator is $699 on top of that if you want it. You can also start with one or two pieces and build up.
The N Result
The N-series is the clearest proof of how far Matrix has come. It's reference digital that doesn't demand a full rack, and it grows with you instead of locking you into one use. You can browse the whole lineup on the Matrix Audio collection page and order any of it online, and the full technical specs live on Matrix's own site. We ship the N-series nationwide, so you can put one together from anywhere.
If you're not sure which pieces you need, give us a ring or send an email before you order. Tell us what you're listening on now, what headphones or speakers you run, and where you want to take it. We'll tell you which boxes make sense for you and which ones you can skip, even if it's the cheaper path. That's the part you don't get buying a stack off a search result.
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