Audiolab has built its reputation on a very British idea of value engineering, where measured performance, sensible ergonomics, and disciplined circuit design matter more than flash. Since the classic 8000 series established the brand as a fixture of the affordable separates world, Audiolab has consistently delivered components that punch above their apparent weight class in transparency and neutrality. The D9 continues that tradition, arriving as a dedicated DAC and preamplifier that also serves as a capable digital hub and headphone amplifier.
What is the Audiolab D9, in a nutshell?
The Audiolab D9 is a standalone digital-to-analog converter and preamplifier that combines a flagship-grade DAC chip, full MQA decoding, wireless streaming, USB storage playback, and a current-feedback headphone amplifier in a compact chassis. In other words, it is the digital nerve center of a system, taking sources from a variety of inputs, converting and conditioning them, and feeding either a power amplifier or a pair of headphones. It is designed for the listener who has moved beyond an all-in-one and wants a dedicated conversion stage without stacking multiple boxes.
Where does the D9 sit in the Audiolab lineup?
The D9 sits as a feature-dense DAC and preamplifier that concentrates Audiolab's converter and digital know-how into a single-purpose component rather than an integrated amplifier. Audiolab's broader catalog spans integrated amps, CD transports, and network players, and the D-series has traditionally been the home for standalone conversion. The D9 positions itself for the enthusiast who wants the DAC and preamp functions handled by one focused device while pairing it with a separate power amplifier of their choice. Because it lacks the power output stage of an integrated, every design decision inside can be pointed at signal purity rather than driving loudspeakers directly.
The Digital Core
What DAC chip does the D9 use and why does it matter?
The D9 uses the ESS Sabre ES9038PRO 32-bit converter, which is ESS's flagship desktop-class DAC silicon. This chip matters because it is the reference part in the ESS lineup, offering eight internal DAC channels that can be summed per output for lower noise and higher dynamic range. In a two-channel application like the D9, those parallel channels are combined so that random noise partially cancels while the signal reinforces, which improves the effective signal-to-noise ratio. The ES9038PRO also carries ESS's HyperStream modulator architecture and their proprietary jitter-eliminating Time Domain jitter reduction, both of which reduce the timing errors that smear detail and blur imaging. The practical payoff is a low noise floor, excellent linearity at low levels, and the kind of resolution that lets quiet reverb tails and low-level ambience remain audible rather than being swallowed.
How does the D9 handle MQA files?
The D9 is a full MQA decoder, meaning it performs the complete unfold and rendering process rather than only the first software unfold. A full decoder reverses both stages of MQA's origami folding and applies the final rendering filters that are matched to the original analog-to-digital converter used in mastering. For someone streaming or storing MQA content, this delivers the highest resolution that the format is capable of reproducing, with the deblurring filters that the format claims restore temporal accuracy. If you have a library or streaming subscription built around MQA, the D9 extracts everything the format encodes rather than leaving performance on the table.
What does the ability to play from a USB HDD give you?
USB HDD playback lets the D9 read and play audio files directly from an attached USB hard drive without a separate streamer or computer in the chain. This is genuinely useful because it removes the noise and complexity of a general-purpose computer as a source. You connect a drive loaded with your library, and the D9 handles file reading and decoding internally. For the enthusiast who prefers local files over cloud streaming, this makes the D9 a self-contained playback engine, and it sidesteps the electrical noise that USB from a busy PC can inject into a system.
How does Bluetooth 5.1 work on the D9 and is it high quality?
The D9 uses Bluetooth 5.1 with aptX, aptX HD, and LDAC codec support, which are the higher-fidelity Bluetooth codecs available today. Standard Bluetooth relies on the basic SBC codec, which discards a lot of musical information, but the codecs supported here carry substantially more data. aptX HD supports higher bit depth transmission, and LDAC pushes an even greater bitrate for the closest thing to lossless-quality wireless. Bluetooth 5.1 as the transport layer improves connection stability and efficiency over older revisions. The result is that casual wireless listening from a phone or tablet retains far more detail and dynamic range than a typical Bluetooth link, which makes it a legitimate listening path rather than a novelty.
Connectivity and System Integration
What inputs and outputs does the D9 offer?
The D9 provides an AES/EBU digital input alongside its Bluetooth and USB storage capabilities, and it offers both balanced XLR and single-ended RCA analog outputs. The AES/EBU input is a professional balanced digital interface that carries the digital stream over a twisted pair with robust common-mode noise rejection, which is why it is favored in studio environments and for longer digital runs. On the output side, the choice between balanced XLR and RCA lets you match the D9 to whatever power amplifier you own. If your amp has balanced inputs, the XLR connection rejects noise picked up along the interconnect and can deliver a cleaner signal, especially over longer cable lengths, while RCA remains fully compatible with the vast majority of amplifiers.
Can the D9 act as a preamplifier in a system?
Yes, the D9 functions as a full preamplifier, meaning it provides volume control and can feed a power amplifier directly without a separate preamp in the chain. This is significant for building a streamlined two-box system, where the D9 handles all source selection, conversion, and level setting, and a dedicated power amplifier does nothing but amplify. Keeping the volume control in the digital and preamp domain of a purpose-built converter avoids the extra gain stages and signal path length of routing through an integrated amplifier's preamp section. For the enthusiast pursuing simplicity and short signal paths, the D9 plus a power amp is a clean architecture.
Headphone Performance
What kind of headphone amplifier is built into the D9?
The D9 uses a current-feedback headphone amplifier, a topology chosen for its wide bandwidth and high slew rate. Current-feedback designs, unlike conventional voltage-feedback amplifiers, tend to maintain their bandwidth largely independent of gain setting, which means transient response stays fast and consistent as you change volume. High slew rate is what lets an amplifier track sharp musical transients, the leading edge of a snare hit or a plucked string, without softening or lagging. For headphone listening, this translates to a sense of speed, grip, and control, with tight bass and clean high-frequency articulation. It signals that Audiolab treated the headphone stage as a real listening path rather than a token addition.
Why does the headphone stage benefit from the same DAC as the line output?
The headphone amplifier draws from the same ES9038PRO conversion stage that feeds the analog outputs, so headphone listeners get the full resolution and low noise floor of the flagship converter. There is no secondary, lesser DAC hiding behind the headphone jack. This matters because the quality of what you hear on headphones is set first by the converter and only then shaped by the amplifier. Feeding a capable current-feedback amp from a reference-class DAC gives the headphone output the same tonal character and detail retrieval as the main system, which keeps late-night private listening honest.
Build, Display, and Ergonomics
What can the 2.8 inch IPS display show you?
The D9 has a 2.8 inch IPS display that can present operational information and includes a VU meter mode. An IPS panel is chosen for its wide viewing angles and accurate, stable color, so the screen remains legible from a seated listening position off to the side. The VU meter is more than nostalgia; it gives you a real-time visual sense of signal level and dynamics, which is useful for gain matching and simply for the pleasure of watching the music move. Audiolab has long offered configurable display behavior across its range, and the ability to show sample rate, input, or the VU meter lets you decide how much information you want at a glance versus a cleaner, dimmer presentation during critical listening.
How is the D9 built and what are its dimensions and weight?
The D9 measures 3.5 by 10.9 by 12.4 inches and weighs 9.3 pounds, which places it as a compact but substantial component. The modest footprint means it slots easily onto a crowded rack or desktop, while the weight indicates real internal structure and a proper power supply rather than a hollow shell. A rigid chassis serves an acoustic and electrical purpose here, providing mechanical stability that resists vibration and offering shielding that helps keep external electromagnetic interference away from sensitive conversion and analog circuitry. It comes in black or silver, so it can either recede into a system or match the traditional brushed-metal look Audiolab is known for.
Why does the power supply matter in a DAC and preamplifier like this?
The power supply matters because everything the ES9038PRO and the analog output stages do depends on clean, stable, low-noise power. A converter of this caliber is only as quiet as the voltage rails feeding it; any ripple or noise on the supply can intrude into the analog output and undermine the chip's inherent low noise floor. In a purpose-built component like the D9, dedicating internal volume and mass to power regulation, rather than sharing a chassis with a power output stage, allows the sensitive digital and analog sections to be fed cleanly. The 9.3 pound weight in such a compact enclosure is consistent with serious attention to that supply and to internal shielding.
Who the D9 Is For
The D9 is aimed at the enthusiast who wants a single, focused box to handle conversion, source switching, preamplification, and headphone duty, then pair it with a power amplifier of their choosing. It leans on the flagship ES9038PRO for its resolution, full MQA decoding for format completeness, high-quality Bluetooth codecs for convenience without compromise, USB HDD playback for computer-free local libraries, and a current-feedback headphone stage for genuine private listening. Combined with balanced and single-ended outputs and a professional AES/EBU input, it slots naturally into the center of a modern, mixed-source system. It is the kind of thoughtfully specified component that reflects Audiolab's long habit of putting engineering substance ahead of spectacle.
