Topping DX3 Pro Plus Review: Desktop DAC/Amp

The desktop DAC/amp combo market has grown crowded, but the Topping DX3 Pro+ keeps appearing at the top of recommendation threads for a reason. For anyone building a first proper desktop listening setup, the appeal is straightforward: one box, one cable, done. The DACs category is full of options that demand more decisions than a beginner wants to make.

What separates a useful combo unit from a compromise is how much performance it actually delivers before you outgrow it. That question is worth answering carefully.

What to Look For in a Desktop DAC/Amp Combo

Output Power and Headphone Compatibility

Output power is the number most buyers underestimate. A combo unit rated for 32-ohm headphones will drive a Sennheiser HD600 or HD650 at sufficient volume, but “sufficient volume” and “optimal control” are different things. Planar magnetic headphones are particularly sensitive to this distinction.

The practical question: what headphones do you own now, and what do you expect to own in the next two years? A 32-ohm IEM user has different requirements than someone planning to move toward 150-ohm or 300-ohm dynamics. Buying to your current headphone rather than your planned headphone is the most common source of regret in this segment.

For the HD600 specifically, a common pairing with budget DAC/amp units, the gap between a laptop output and a proper stack is real. The HD600 is not the hardest load a budget combo has to drive.

DAC Chip and Measurement Performance

The DAC chip tells you something, but not everything. The ES9038Q2M, present in the DX3 Pro+, is a well-characterized chip with strong measurement results published on Audio Science Review. Low noise floor, low distortion, flat frequency response. For most headphone listening scenarios, these measurements exceed the audible threshold by a comfortable margin.

What the chip alone doesn’t tell you is implementation quality. Two units using the same chip can measure differently based on power supply design, output stage, and PCB layout. And third-party bench tests are more useful than chip model alone when evaluating a specific product.

For practical purposes at the budget and mid-range tier, modern DAC implementations from Topping, FiiO, and similar manufacturers cluster closely on measurements. The differences that matter most for real listening tend to be downstream: output power, output impedance, and build quality.

Connectivity and Input Options

A combo unit’s input and output options define how it fits into your existing and future setup. USB input is non-negotiable for a desktop unit fed from a computer. Optical and coaxial inputs add flexibility for console or television sources. Bluetooth, specifically LDAC support, matters if you use a phone as a primary source and want to avoid the USB cable entirely.

Output options matter for upgrade paths. A line-level output (RCA or XLR) means the unit can serve as a pure DAC later, feeding a separate amp if you outgrow the built-in headphone stage. Combo units without a line-level output are dead ends if your headphone requirements grow.

Exploring the full range of headphone DAC options before committing to a specific form factor is worth the time, particularly if your headphone collection is likely to change.

Build Quality and Long-Term Use

Budget and mid-range combo units vary more in build than in measurements. Encoder feel, front panel rigidity, and display legibility matter over months of daily use in ways that first-impression reviews underweight.

The DX3 Pro+ has an aluminum enclosure, which is solid build quality for its price tier.

Top Picks

Topping DX3 Pro+

The Topping DX3 Pro+ occupies a specific and genuinely useful position: a well-measured, all-in-one desktop unit for buyers who want a capable first stack without managing two separate components.

Bluetooth LDAC support is a meaningful differentiator here. For a phone-first listener who streams Qobuz or Tidal, the ability to use the DX3 Pro+ wirelessly without accepting AAC or SBC compression is a practical advantage.

The headphone amplifier section is where the trade-off lives. The 6.35mm output handles 32-ohm to 150-ohm headphones for most dynamic driver use cases. Planar magnetics are generally more demanding of their source, so if planars are your current or planned headphones, the DX3 Pro+ is a starting point, not a destination.

The line-level RCA output means the unit is not a dead end. It can serve as a pure DAC feeding a separate amp, the Topping L50, for instance, when the headphone stage becomes the limitation. That upgrade path is worth factoring into the initial decision.

Check current price on Amazon.

Buying Guide

Combo Unit or Separates?

The central decision in this category is whether a single unit does enough for your current and near-future needs. Combo units win on desk space, cable management, and initial outlay. Separates, a dedicated DAC and a dedicated amplifier, typically offer more output power, better upgrade flexibility, and the ability to replace one component without replacing the other.

For dynamic driver headphones under 150 ohms, a well-implemented combo unit at the budget tier is a legitimate choice. The performance ceiling is high enough that most buyers will not outgrow the DAC section for years, if ever. The amp section is the more likely constraint.

For planar magnetic headphones, the separates argument strengthens considerably. Dedicated amp stages in the mid-range bracket, the Topping A50s, the JDS Atom Amp+, deliver meaningfully more headroom and damping factor than combo units at comparable total spend.

What “Budget Tier” Actually Means Here

Budget in this context means a specific performance band: clean measurements, adequate power for common dynamic driver headphones, and a build quality that holds up under daily use. It does not mean compromised audio quality by any absolute standard. Modern budget DAC/amp units from credible manufacturers measure better than mid-range gear from a decade ago.

The practical limit of the budget tier is headphone compatibility. High-impedance headphones above 250 ohms, the HD650, the Beyerdynamic DT 880 600Ω, benefit from amplifier stages that budget combo units don’t provide. If your headphone collection includes or plans to include those loads, budget your stack accordingly.

The broader DAC and headphone amp landscape has expanded at the budget tier over the past three years. Options that would have been considered mid-range in 2020 now sit in the entry bracket. That context matters when reading older recommendations.

Comparing the DX3 Pro+ to the FiiO K7 and K11

The FiiO K7 and K11 occupy the same functional category, desktop combo DAC/amp, but target a slightly different use case. Both FiiO units offer more output power than the DX3 Pro+, making them better suited to high-impedance dynamics and planars. The trade-off is price tier: both sit above the DX3 Pro+ on the spend curve.

The DX3 Pro+ holds the edge on Bluetooth LDAC support, neither FiiO unit matches that wireless capability at the time of writing. For a phone-first listener who values wireless input, the Topping remains the logical choice at its tier.

For buyers whose primary source is a desktop or laptop via USB, and whose headphone collection includes or plans to include planars or high-impedance dynamics, the FiiO K7 represents a meaningful step up. The choice between them is less about which measures better and more about which amp section your headphones actually need.

Output Impedance and IEM Compatibility

Output impedance is underrepresented in combo unit reviews and matters more than most buyers realize, particularly for IEM users. An output impedance above 1 ohm will alter the frequency response of multi-driver IEMs with low-impedance loads. For single-dynamic-driver IEMs, the effect is smaller but still present.

This matters for buyers who intend to use the unit with both IEMs and full-size headphones from the same output.