Overview

The Loxjie A30 is a compact integrated amplifier that combines a Class-D power stage, a USB/optical/coaxial DAC, Bluetooth input, and a 6.35 mm headphone jack in one box. It uses Infineon’s MA12070 amplifier platform with an ESS ES9023 DAC and an NJW1194 electronic volume/tone control. Connectivity covers USB audio (up to 32-bit/384 kHz), optical/coaxial S/PDIF, RCA line-in, and Bluetooth 5.0 with aptX, plus a subwoofer pre-out and remote control [2].

Scientific Validity

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Independent bench results show competent—but not state-of-the-art—amplifier performance. Audio Science Review measured roughly low-80 dB SINAD via digital inputs and about ~40 W into 4 Ω before clipping, consistent with typical MA12070 implementations; analog-in performance measures lower than digital-in per the same review discussion [1]. Manufacturer/retailer documentation confirms USB 32-bit/384 kHz support and the internal parts set (ES9023, NJW1194) but does not substantiate higher SINAD figures [2]. The built-in headphone output exists and works but is limited in drive compared to dedicated headphone amps; users with insensitive or high-impedance headphones should plan accordingly [1][2].

Technology Level

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The A30 adopts proven 2019–2020-era building blocks (Infineon MA12070 Class-D, ESS ES9023, NJW1194). The feature mix—USB/S/PDIF DAC, aptX Bluetooth, sub-out, remote, on-device EQ—is practical and up-to-date, but there is no novel circuit technique or new measurement milestone beyond standard integrated desktop designs [2].

Cost-Performance

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Cheapest fully equivalent alternative (functions + measured performance) found at this writing is a two-box bundle:

• AIYIMA D03 (USB/optical/coax DAC + Class-D speaker amp + Bluetooth with aptX family; manufacturer specs THD+N 0.001% @1 kHz/1 W, SNR 93 dB) at 143.99 USD [3]
• Behringer HA400 compact headphone amp at 24.90 USD [4]
  → Combined 168.89 USD achieving the same user-visible functions (digital/BT inputs, speaker amp, plus headphone out) and broadly equivalent measured fidelity for general desktop use ([1] vs [3]).

CP calculation (explicit): 168.89 USD ÷ 169.99 USD = 0.993… → score 1.0 after rounding to one decimal.
(Note: If you don’t require a headphone jack, the single-box D03 at 143.99 USD would yield ~0.85.)

Reliability & Support

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Construction is a simple, cool-running Class-D platform with an external PSU, which tends to aid reliability. Formal long-term failure data and an official global warranty term were not verified from the manufacturer at the time of writing; support typically runs through retailers/distributors. Fit/finish is decent for desktop duty [2].

Rationality of Design Philosophy

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The A30 prioritizes integration and convenience (DAC + BT + tone controls + sub-out + headphone) over chasing the very highest bench numbers. That’s a rational choice for desktop users wanting one box, but it does limit ultimate headphone power and leaves amplifier SINAD below transparent benchmarks [1][2].

Advice

If you want a neat all-in-one to feed passive speakers from USB/S/PDIF/BT and occasionally use easy-to-drive headphones, the A30 works well. For stronger headphone drive, add a dedicated headphone amp (or consider a different all-in-one). If pure value is your focus, the AIYIMA D03 (+ a small headphone amp if needed) undercuts the A30’s price while matching functions and practical fidelity in typical use [3][4].

References

[1] Audio Science Review — “Loxjie A30 Amplifier Review”, accessed 2025-08-23. Notes: digital-in path measures ~low-80 dB SINAD; power approx. 40 W/4 Ω before clipping; analog-in is worse; headphone stage limited. https://www.audiosciencereview.com/forum/index.php?threads/loxjie-a30-amplifier-review.17547/

[2] Amazon (LOXJIE store) — “Loxjie A30 Desktop Stereo HiFi Audio Power Amplifier…”, accessed 2025-08-23. Confirms ES9023 DAC, NJW1194 volume/tone IC, Bluetooth 5.0 with aptX, USB 32-bit/384 kHz, I/O set. https://www.amazon.com/LOXJIE-MA12070-Headphone-Amplifier-Bluetooth/dp/B08J7Z8TN6

[3] Amazon — “AIYIMA D03 Bluetooth 5.0 DAC Amplifier…”, accessed 2025-08-23. Price 143.99 USD at capture; specs include USB/optical/coax/BT inputs; THD+N 0.001% @1 kHz/1 W, SNR 93 dB. https://www.amazon.com/AIYIMA-D03-Bluetooth-Amplifier-Amplificador/dp/B098QSPJJG

[4] Sweetwater — “Behringer MicroAMP HA400 4-ch Headphone Amp”, accessed 2025-08-23. Price 24.90 USD. https://www.sweetwater.com/store/detail/HA400–behringer-microamp-ha400-4-ch-headphone-amplifier

(2025.8.24)