Audiolab has spent decades building a reputation on a specific engineering philosophy: measurable performance, thermal and electrical stability, and long term reliability, all delivered without theatrics. The brand emerged from a British hi-fi tradition that prized honest amplification over voicing tricks, and that lineage runs directly through to the 9000A. This is the flagship integrated amplifier in the current lineup, sitting above the well regarded 6000A and 7000A. Where those models established the house sound at more accessible tiers, the 9000A consolidates everything Audiolab knows about analog gain stages, digital conversion, and system flexibility into a single chassis.
For an experienced listener, the interesting part is not that the 9000A is capable. It is how each design decision was made and why. Let us take it apart, function by function.
Amplification and Power
What amplifier topology does the 9000A use and why does it matter?
The 9000A uses a Class AB output stage with Audiolab's CFB (Complementary Feedback) design. Class AB is the pragmatic middle ground between the efficiency of Class D and the linearity of pure Class A. It runs a small idle bias so the output devices stay conducting through the low level region where crossover distortion normally appears, then hands off to a more efficient conduction mode as the signal swings larger. The audible payoff is low distortion at the delicate low signal levels where the ear is most sensitive, without the enormous heat and power waste of full Class A.
The CFB (Complementary Feedback) part is the more distinctive choice. In a conventional emitter follower output stage, the output transistors are configured for voltage gain of roughly unity and rely heavily on global feedback for linearity. A complementary feedback pair instead wraps local feedback around the output devices themselves, driving them harder toward linear behavior before global correction is applied. The practical benefits are improved thermal stability (the local feedback tightens the operating point so bias drifts less as the transistors heat up) and lower distortion that stays consistent across the output swing. For the listener, that translates to composure when the music gets dense and dynamic, rather than a stage that hardens under load.
How much power does the 9000A deliver?
The 9000A is rated at 2x100W into 8 ohms and 2x160W into 4 ohms. The number worth studying is the relationship between those two figures. Going from 8 ohms to 4 ohms halves the load impedance, and an ideal voltage source would double its power. The 9000A climbs from 100W to 160W, which is a healthy increase that indicates a power supply and output stage able to deliver substantial current into a falling impedance without collapsing. Real loudspeakers are not flat resistive loads; their impedance dips at certain frequencies, and it is exactly at those dips that an amplifier is asked for current. The 9000A's ability to push toward 160W into 4 ohms is a signal that it will keep its grip on demanding speakers rather than run out of headroom in the bass and lower midrange.
Why does the power supply design matter here?
A power supply is the reservoir the amplifier draws from during transients, so its quality directly limits dynamic performance. When a kick drum or orchestral swell demands sudden current, the output stage cannot create energy; it can only pass along what the supply holds ready. A robust, well regulated supply with generous energy storage lets the amplifier reproduce those peaks cleanly and then recover instantly for the next transient. Equally important, keeping the noisy digital section (the DAC, display, and control circuitry) supplied and shielded separately from the sensitive analog gain stages prevents digital switching noise from contaminating the audio path. This separation of concerns is a core reason a capable integrated can rival separates: the engineering discipline is in the isolation.
Digital Section and Decoding
What DAC is inside the 9000A?
The 9000A uses the ES9038PRO 32-bit ESS Sabre DAC, which is ESS Technology's top tier converter chip. The 9038PRO is a flagship part built around a multi-bit hyperstream modulator and ESS's Time Domain Jitter Eliminator. In plain terms, the chip is engineered for very low noise, very low distortion, and strong rejection of timing errors in the incoming digital stream. Jitter (tiny timing variations in the digital clock) smears detail and hardens transients when uncorrected, so a converter that actively suppresses it preserves the crispness of leading edges and the placement of instruments in the soundstage. Fitting the 9038PRO into an integrated rather than a standalone DAC means you get reference class conversion without an extra box or an additional interconnect in the signal path.
What is MQA decoding and does the 9000A support it?
The 9000A is a certified MQA full decoder over PC USB, coax, and optical. MQA is an encoding scheme that folds high resolution audio into a smaller stream and applies a form of time domain correction. A full decoder performs the complete unfold, recovering the full resolution and applying the final rendering stage rather than stopping at a partial decode. Because that decoding happens inside the 9000A, the chain stays intact from source to conversion. Whether MQA content is central to your library or not, having full decoding on the three primary digital inputs means the amplifier extracts everything the format offers.
How does Bluetooth work on the 9000A and how good can it sound?
The 9000A supports Bluetooth 5.1 with aptX, aptX HD, AAC, and LDAC codecs. The codec list is what determines wireless quality, because Bluetooth's limited bandwidth forces compression and each codec handles that differently. AAC serves Apple devices well, aptX and aptX HD offer higher bit rates and lower latency for compatible Android and desktop sources, and LDAC pushes toward the highest wireless bit rates available, approaching the transparency of a wired stream under good radio conditions. Bluetooth 5.1 itself brings a more robust and efficient connection than earlier versions, so the practical result is a stable link that automatically negotiates the best mutually supported codec. This is convenience wireless done seriously rather than as an afterthought.
Analog Inputs and Headphone Stage
Does the 9000A have a phono stage?
Yes, the 9000A includes a dedicated low-noise moving magnet (MM) phono stage. A phono input is not a line input; it must apply RIAA equalization to reverse the curve applied during record cutting, and it must provide substantial clean gain because a cartridge's output is tiny. That low signal level is why low noise design matters so much: any hiss or hum introduced at this stage gets amplified along with the music. A dedicated MM stage built into the amplifier keeps the delicate cartridge signal in a controlled electrical environment from the very first gain step, and it removes the need for an outboard phono box and its extra interconnect.
What kind of headphone amplifier does the 9000A use?
The 9000A uses a current-feedback headphone amplifier, which is a discrete, purpose built stage rather than a token output tapped off the speaker terminals. Current-feedback topology is prized for high slew rate and wide bandwidth, meaning it can follow fast transients accurately and maintain performance regardless of the frequency being reproduced. For headphones, that supports tight control and detail across a range of impedances and sensitivities. Because it is a genuine dedicated stage, it drives your headphones directly rather than through resistor networks that would compromise damping and dynamics.
Controls, Display, and System Integration
What does the 4.3 inch display do?
The 9000A has a 4.3 inch IPS display that shows source, volume, sample rate, and configuration information. IPS panels offer wide viewing angles and stable color, so the readout stays legible from a normal seated listening position rather than washing out off axis. Beyond aesthetics, a clear display of incoming sample rate and decoding status is genuinely useful for confirming that a source is delivering the resolution and format you expect, which is exactly the kind of feedback an experienced user checks.
What are the operating modes and why do they matter?
The 9000A offers three operating modes: Integrated, Pre-Power, and Pre-only. Integrated mode uses the whole unit as a single amplifier. Pre-Power lets you use the preamp and power amp sections in a defined configuration, and Pre-only turns the 9000A into a preamplifier feeding an external power amplifier. This flexibility is what lets the 9000A grow with a system. You can start with it doing everything, then later add outboard power amplification and keep the 9000A's preamp, DAC, and phono stage as the control center. That upgrade path protects the investment and keeps the 9000A relevant as your ambitions change.
What are the physical dimensions and build of the 9000A?
The 9000A measures 3.5 x 17.5 x 13.5 inches and weighs 20.7 lbs, finished in black or silver. The weight is meaningful because mass in an amplifier usually reflects a serious transformer and substantial heatsinking, both of which support the power delivery and thermal stability discussed earlier. The relatively compact footprint means it integrates into standard racks and living spaces without demanding an oversized shelf. The choice of black or silver lets it sit alongside the rest of the Audiolab 9000 series or a mixed system without visual friction.
Where the 9000A Sits
How does the 9000A fit in the Audiolab lineup?
The 9000A is Audiolab's flagship integrated amplifier, the top of a range that includes the 6000A and 7000A. Each step up the line brings more refined implementation, and the 9000A represents the fullest expression of the brand's approach: the reference grade ES9038PRO DAC, the CFB output stage, full MQA decoding, a dedicated headphone amplifier, an MM phono stage, and the flexibility of three operating modes. It is designed for the listener who wants a single chassis to serve as the analog and digital heart of a high performance system, with enough current for real loudspeakers and enough connectivity to stay central for years. For the enthusiast weighing whether one well engineered integrated can do the work of several boxes, the 9000A is Audiolab's most complete answer.
