Table of Contents

1. Key Features
2. Performance
3. Build Quality and Usability
4. Pros and Cons
5. User Opinions & Community Sentiment
6. Comparisons
7. Final Verdict

Luxsin’s X9 is a do‑everything desktop hub that collapses DAC, headphone amplifier and pre‑amplifier into a single, compact chassis. Introduced in late 2024 and priced around US$1,099 (not including regional taxes), the X9 is the debut product from Luxsin, an off‑shoot of the Zidoo Group. The brand positions itself as the high‑end sibling to Eversolo, inheriting its parent company’s software know‑how while attacking the headphone market with hardware innovations. The result is a desktop component that pairs state‑of‑the‑art AKM digital conversion with real‑time DSP, automatic headphone gain detection and a surprisingly capable pre‑amp section.

The X9’s industrial design doesn’t hide its ambition. A 15 ° faceted front panel holds a 4‑inch full‑colour touchscreen; behind it sits a fully balanced analogue path from DAC to headphone output, and a motor‑driven R‑2‑R relay ladder volume control that uses 20 Omron micro‑relays and 88 precision resistors. The spec sheet reads like a wish‑list: dual AK4499EX DAC chips with AK4191 modulators, 32‑bit/768 kHz PCM and DSD512 support, a star‑shaped power distribution with < 40 nV, headphone outputs delivering up to 6.4 W into 16 Ω, 2,500‑profile headphone EQ database, crossfeed and soundstage expansion, subwoofer outputs with adjustable crossover slopes, Wi‑Fi control, Bluetooth 5.0 and HDMI‑ARC integration.

Unlike typical “spec‑monster” audio products, the Luxsin X9’s story isn’t just about numbers; it’s also about versatility and usability. Its Harman‑target EQ profiles and impedance detection make it accessible to novice users, while the R2R ladder, subwoofer management and balanced outputs appeal to tweakers. The following sections unpack the X9’s feature set, performance and community reception in detail, drawing on professional reviews and user feedback from across the audio world.

Key Features

The X9 distinguishes itself with a rare combination of cutting‑edge DAC technology, powerful amplification and clever DSP. Here are the highlights:

Flagship Dual AKM DAC and DSP Engine

At its core the X9 uses two AK4499EX DAC chips paired with an AK4191 modulator. This dual‑DAC configuration is capable of decoding PCM up to 768 kHz/32‑bit and native DSD512. The DACs feed a balanced differential amplifier built around OPA1612 op‑amps and TI’s TPA6120A2 power stage, delivering up to 4,000 mW at 32 Ω. Luxsin also employs Accusilicon femtosecond oscillators for low jitter and an XMOS XU‑316 USB interface that supports asynchronous USB audio.

The digital section is overseen by an AKM AK7739 DSP. The DSP powers multiple features: a 2,500‑profile HP‑EQ database built around measured headphone responses; real‑time impedance detection that measures the load connected to the 6.3 mm and 4.4 mm jacks and sets optimal gain automatically; crossfeed and a soundstage slider to widen or narrow the sonic image; 10‑band parametric EQ and “sound style” presets; and optional bass management via dual subwoofer outputs.

R‑2‑R Relay Volume Ladder

Instead of a conventional potentiometer, Luxsin uses a balanced R‑2‑R relay ladder for volume control. The relay ladder provides 1024 discrete steps with 0.1 dB precision and ±0.05 dB channel matching. Reviewers have praised the tactile feel and the absence of channel imbalance even at low volumes. Turning the knob triggers a satisfying clicking sound as the relays engage, and the X9 maintains 0.1 dB left/right channel balance accuracy.

Star‑Shaped Power Supply and Balanced Architecture

To minimize noise and improve dynamic range, the X9 employs a star‑shaped power distribution system with separate digital and analogue rails. Headfonics reports that this design achieves an ultra‑low 40 nV ripple, enhancing noise control and expanding dynamic range. The result is a THD+N of roughly –120 dB and a dynamic range/SNR exceeding 128 dB. The entire signal path from input to headphone output is fully differential, and the balanced architecture is maintained across all outputs, including XLR pre‑outs and subwoofer outputs.

Versatile Connectivity and DSP Control

Rear panel connectivity includes USB‑B and USB‑C inputs, coaxial and optical SPDIF, HDMI ARC, RCA analogue input, Bluetooth 5.0 and dual subwoofer RCA outputs. Balanced XLR and single‑ended RCA pre‑outs allow the X9 to act as a pre‑amplifier, and the dual sub outs offer adjustable low‑pass filters (40–300 Hz) and slopes up to 48 dB/octave. On the front, the unit provides 6.35 mm single‑ended, 4.4 mm balanced, and 4‑pin XLR headphone.

Control options extend beyond the front panel. The X9’s screen offers swiping gestures to switch inputs, adjust EQ, select crossfeed or choose from nine VU‑meter styles. For remote operation, there is an infrared handset, a mobile app (available for iOS and Android) and a web‑based control panel accessible via Wi‑Fi. Firmware updates are delivered over‑the‑air and have been frequent, reflecting the brand’s responsiveness to user feedback.

HP‑EQ Profiles and Parametric EQ

A standout feature of the X9 is its HP‑EQ database, which contains frequency response measurements for more than 2,500 headphones. Users can select their headphone model on the touchscreen or in the app, and the X9 applies a hardware‑level EQ that approximates the Harman target curve. Multiple profiles may be available for certain models (e.g., Sennheiser HD 650) to suit different preferences. The HP‑EQ can be bypassed entirely, and there is a 10‑band parametric EQ and several pre‑defined “sound styles” for more bespoke tuning.

Subwoofer and Bass Management

Luxsin has designed the X9 to integrate seamlessly into 2.1 or 2.2 speaker systems. Dual subwoofer outputs allow independent low‑pass filters from 40 Hz to 300 Hz with slopes up to 48 dB per octave. Users can simultaneously apply a high‑pass filter to their main speakers to balance the transition, making the X9 one of the few desktop DAC‑amps that offer real bass management at this price. Audiogon commenters note that the X9’s bass management and analogue volume control make it a unique pre‑amp option under $2,000.

Performance

Sound Quality & DAC Performance

The X9’s raw DAC performance is transparent and neutral. In bypass mode (with DSP off), reviewers describe the sound as clean, transparent and slightly laid‑back, with a “pitch‑black” background and tight, controlled bass. The treble is described as smooth and non‑fatiguing; it offers a crisp top end without sounding clinical. Prime Audio’s reviewer notes that bypass mode is “honest and uncoloured”—true to the source but softer and less dynamic than some competing DACs. This neutrality allows the user‑adjustable EQ and DSP features to shape the tonal character.

When the HP‑EQ and DSP functions are engaged, the X9’s character can change dramatically. The built‑in DSP makes the sound more engaging, boosting dynamics and giving vocals more authority while suppressing resonance spikes. The parametric EQ and crossfeed can smooth out spikes and dips in the frequency response, leading to better linearity and a more natural presentation. Users can toggle these features quickly, and the ability to recall multiple profiles encourages experimentation.

Headphones with higher impedance (e.g., Sennheiser HD 800 S) benefit from the X9’s powerful amp section. The X9 demonstrates great control, definitive power and agility in bass with planar magnetic headphones, maintaining speed and control even with demanding orchestral works. The X9’s measured power output of up to 6.4 W into 16 Ω means it can drive even notoriously insensitive headphones like the HiFiMAN Susvara; the JJazzifi reviewer confirmed it had enough power for the Susvara and sounded musical and fun after applying the headphone EQ.

Timbre and Frequency Balance

Across multiple reviews, the X9’s default tonal balance is described as neutral with a slight warmth. The soundstage is wide and well‑layered, with good separation between instruments and vocals positioned slightly further back, creating a relaxed and spacious quality. The midrange is reported to be clean, natural and textured. The bass performance is praised for its texture and control: bass notes are tight, well‑defined and extend deep without bleeding into the midrange. The treble is smooth and refined, offering sparkle without harshness.

The timbre analysis concurs: the X9 presents a neutral, gently rolled‑off treble in bypass mode, with tight and firm bass impacts. When DSP is engaged, the unit adds vividness and fuller mids, enhancing separation and dynamics. Some reviewers caution that with certain “cool‑toned” headphones and high gain, a slight digital sheen can appear, but these instances were isolated and often resolved via EQ adjustments.

Staging and Dynamics

One of the X9’s strengths is its ability to project a wide, immersive soundstage. Reviewers compared the experience to the ambience of an opera house, where the listener is properly distanced from the stage; instruments are well‑separated, and crossfeed can expand the perceived width without sounding hollow. The soundstage adjustment slider allows users to tailor width and depth to personal taste. With planars, the bass feels deeper and more textured; dynamic headphones sound bolder for bass instruments. Users likewise praised the spacious and wide soundstage and noted that imaging accuracy is excellent, aided by the digital crossfeed option for a more speaker‑like presentation.

Dynamics in bypass mode are somewhat polite. Several reviewers noted that without DSP, the X9 can sound slightly soft and less exciting compared to some reference amps. Engaging the EQ or crossfeed increases perceived dynamics, and the amplifier’s power ensures that headroom is never an issue.

Preamplifier Capability and Subwoofer Integration

Beyond headphone duties, the X9 functions as a full‑featured pre‑amplifier. Balanced XLR and single‑ended RCA outputs allow it to feed power amps or active speakers. Its dual subwoofer outputs with adjustable crossovers support 2.1 and 2.2 systems. An Audiogon user praised the X9 for integrating bass management features not typically found at this price, noting that it replaced a more complex chain of devices and improved subwoofer integration.

Measurement data from Audio Science Review (ASR) shows that the X9 achieves SINAD around 113 dB on the balanced line outputs and a dynamic range of 128 dB. THD+N remains around –120 dB, and the analog volume control exhibits minimal channel imbalance. The same reviewer appreciated the built‑in Wi‑Fi and web interface for controlling EQ and firmware, although they noted some software bugs at launch that were later fixed.

Build Quality and Usability

Design and Chassis

The Luxsin X9 strikes a balance between modern minimalism and retro touches. Headfonics describes the sleek, tilted front panel with faceted corners and a 4‑inch laminated touchscreen that offers smooth gesture navigation. The angled design makes the display easy to read even when seated or standing, and the aluminium chassis is hefty (≈3.7 kg) and free from resonance. Prime Audio notes that the anodised aluminium shell feels robust, with ribbed side panels for heat dissipation and a 15 ° front face that improves ergonomics. Both reviewers agree that the X9 looks better in person than in promotional renders.

Touchscreen, UI and App

The 4‑inch IPS display operates at 960 × 400 resolution with multiple brightness settings and blackout mode. Users can swipe horizontally to access the FX menu (for crossfeed and soundstage adjustments) and vertically to change inputs or digital filters. The home screen can show one of nine VU‑meter styles (analogue needles, bar graphs, digital spectrograms etc.), and the layout is intuitive enough that reviewers rarely needed the manual. According to JJazzifi, the touchscreen is crisp and clear, with an organised back‑panel layout that makes wiring easy.

Remote operation is handled through an infrared remote, and the Luxsin app mirrors the on‑device UI. For advanced control, a web‑based interface accessible over the local network allows parametric EQ adjustments, headphone profile selection and firmware updates. This tri‑pronged control system has been widely praised for flexibility and ease of use.

Inputs, Outputs and Accessories

Physically, the X9 offers comprehensive connectivity. In addition to digital inputs (USB‑B, USB‑C, coaxial, optical, HDMI ARC and Bluetooth), there is a RCA analogue input with +10 dB gain for external sources. Outputs include balanced XLR and single‑ended RCA pre‑amp outputs, dual subwoofer outputs with crossover control, and three front‑panel headphone jacks. Users point out the convenience of 12 V trigger ports that can power on other components simultaneously.

The X9 ships with a USB‑B and USB‑C OTG cable, a power cord, a Bluetooth remote and a concise user manual. There is no ethernet port—Wi‑Fi is always on—which some reviewers consider an oversight.

Ease of Use and Firmware Updates

User reports emphasise the X9’s ease of setup. The impedance detection process is simple: plug in a headphone, wait a few seconds while the impedance measurement animation plays, and the device automatically selects the appropriate gain. The HP‑EQ interface allows users to search by headphone model or sort favourites for quick access. Swiping right opens the settings menu, while swiping left reveals the FX menu for crossfeed and soundstage adjustments.

Luxsin has been proactive about firmware. The brand issues updates via OTA that add features (e.g., more HP‑EQ profiles, additional VU meters, improved crossfeed algorithms) and fix bugs. Updates sometimes arrive weekly, reflecting the brand’s nimbleness. Users must be comfortable with regular software changes, but the upgrades show a commitment to listening to customer feedback.

Pros and Cons

Strengths	Weaknesses
Versatile all‑in‑one functionality – combines DAC, headphone amp and pre‑amp with dual subwoofer outputs, crossfeed and EQ.	Sound is polite in bypass mode – some find the default presentation too soft and lacking excitement.
Flagship DAC and high power output – dual AK4499EX, AK4191 modulator, 4,000 mW @32 Ω and support for DSD512/PCM 768 kHz.	Reliance on software – features and performance depend on firmware; early bugs and updates can be frequent.
R‑2‑R relay volume ladder with precise channel matching.	No Ethernet port and always‑on Wi‑Fi.
HP‑EQ database and flexible DSP – 2,500+ headphone profiles, parametric EQ, crossfeed, soundstage control.	Relay clicks – the R‑2‑R ladder produces audible clicks during volume changes, which some may find distracting.
Intuitive touchscreen and app – easy swipes, nine VU‑meter styles, Wi‑Fi control, web interface.	Limited Bluetooth codec support – official support for only SBC and AAC; LDAC and aptX are present but not certified.
Excellent build quality and aesthetics – CNC‑machined aluminium chassis, angled display, sturdy weight.	No headphone impedance detection on XLR‑4 output.
Powerful amplification and noise‑free background – drives demanding headphones and IEMs without hiss.
Bass management and subwoofer outputs – unique for a desktop DAC‑amp.

User Opinions & Community Sentiment

Beyond formal reviews, the Luxsin X9 has sparked lively discussion in forums and on social media. Here are some recurring themes:

• Visually Stunning and Fun to Use – Reddit users describe the X9 as “beautiful” and praise the colourful VU meters and responsive touchscreen. A Head‑Fi member compared it to his older setups and concluded that the X9 looks cleaner and offers a more cohesive experience. The tactile relay volume control is divisive: some enjoy the mechanical click; others find it distracting.
• Impressive Soundstage and Tuning Flexibility – Many users appreciate the ability to adjust soundstage width and tailor frequency response via the HP‑EQ. One Reddit reviewer found that the X9’s soundstage slider produced a wider, more open presentation than their K11 R2R DAC, but they felt the DAC’s stock sound alone didn’t justify the price difference. Another commenter on r/headphones called the X9 “end‑game” and reported that it drove their HiFiMAN Ananda Nano with powerful bass, detailed highs and smooth mids, making crossfeed particularly enjoyable for gaming.
• Pre‑Amp Utility and Subwoofer Integration – Audiogon posters highlight that the X9 is one of the few pre‑amps with an analogue relay volume control and dual subwoofer outputs, allowing proper bass management. Users who integrated the X9 into home theatre setups appreciated the adjustable crossover and the ability to manage multiple subs.
• Software and Firmware – The community acknowledges Luxsin’s frequent firmware updates. Some early adopters experienced bugs (e.g., occasional UI freezes, missing headphone profiles) but report that the company addressed issues quickly. Others appreciate the constant addition of features like extra EQ curves and VU meter designs.
• Value Proposition – There is debate about whether the X9’s price is justified purely on sound quality. Several users note that while the DAC and amplifier performance is competitive, much of the value lies in the unique combination of DSP, EQ, subwoofer management and user interface. Those who require these features feel the X9 represents excellent value; those seeking purely audiophile DAC/amp performance may find more straightforward alternatives.

Comparisons

vs. FiiO K17

FiiO’s K17 is a popular portable DAC‑amp priced around US$600. It uses a single AK4499EQ DAC chip and offers ~1.5 W at 32 Ω, which is substantially less powerful than the X9’s 6.4 W balanced output. The K17 includes parametric EQ and balanced outputs but lacks the X9’s HP‑EQ database, dual subwoofer outputs, relay volume ladder and 4‑inch touchscreen. Reviewers note that the K17 sounds more dynamic out of the box but has fewer customisation options. If you prioritize portability and basic EQ, the K17 suffices; if you need a desktop hub with advanced DSP, the X9 offers more flexibility.

vs. RME ADI‑2 DAC / Pro

The RME ADI‑2 is renowned for its transparency, sophisticated DSP and remote control. It uses an AK4493 DAC and provides 1.5 W into 32 Ω. Like the X9, it features parametric EQ, crossfeed and an internal DSP engine. However, the ADI‑2 lacks headphone impedance detection, has no subwoofer outputs and uses a smaller monochrome display. The X9’s HP‑EQ database and R‑2‑R volume control set it apart. The ADI‑2 remains a benchmark for no‑nonsense, studio‑grade performance, while the X9 appeals to those wanting a more luxurious UI and integrated pre‑amp/subwoofer capabilities.

vs. CH‑AMP Signature / CHORD Anni

In Headfonia’s review, the author compared the X9 with the CH‑AMP Signature amplifier (paired with a CH‑DAC) and found that while the CH‑AMP offered superior layering and excitement, the X9 provided far more features at a lower price. The CH‑AMP lacks DSP, HP‑EQ and subwoofer outputs; it excels purely as an amplifier. For listeners who value raw musical engagement and already own a high‑quality DAC, the CH‑AMP may be preferred; for those seeking an all‑in‑one with tweakable sound, the X9 is compelling.

vs. Eversolo Streamers (DMP‑A6 / A8)

Since Luxsin and Eversolo share a parent company, many prospective buyers consider Eversolo’s DMP‑A6 or A8 streamers. These devices offer network streaming, dual DAC chips and balanced outputs but lack headphone outputs and subwoofer management. Users who primarily stream to a speaker system might choose Eversolo, while those seeking a combined DAC‑amp‑preamp choose the X9. Some users pair an Eversolo streamer with the X9 to create a complete digital front end.

Final Verdict

Luxsin’s X9 enters a crowded market of desktop DAC‑amp‑preamp combos and immediately stands out through a combination of technical excellence, feature innovation and usability. Its dual AK4499EX DACs, star‑shaped power distribution and balanced architecture deliver measurements that rival benchmark units, while the R‑2‑R relay volume ladder and impedance‑sensing circuitry provide analog‑like control and ease of use. The 4‑inch touchscreen, app and web interface make interacting with its extensive DSP options intuitive, and the HP‑EQ database invites experimentation without requiring deep technical knowledge.

In bypass mode, the X9 is transparent and slightly laid‑back, making it an honest translator of recordings. Engage the DSP and it becomes a chameleon, capable of transforming its soundstage, tonal balance and dynamics to suit the listener’s mood or headphone. Its ability to integrate subwoofers, manage crossovers and function as a high‑quality pre‑amp means it can replace multiple boxes in a desktop or small living‑room system.

The X9 is not perfect. The absence of an Ethernet port and always‑on Wi‑Fi may frustrate network purists. The mechanical relay clicks during volume changes are noticeable, and the sound can feel restrained in pure bypass mode. Software quirks occasionally surface, though Luxsin’s frequent firmware updates have addressed most if not all early issues.

For listeners who crave a versatile, tweakable desktop hub with high power, extensive DSP and pre‑amp features, the Luxsin X9 is a compelling choice. It combines audiophile‑grade performance with consumer‑friendly usability, making it equally suitable for headphone enthusiasts and those building compact speaker systems. If you value pure sonic excitement more than flexibility, other amplifiers may be more captivating. But if you want a single device that can adapt to any headphone, integrate a subwoofer and let you dial in the perfect sound, the X9 lives up to Luxsin’s promise of being shamelessly over‑qualified.