Overview

The Aiyima A07 Premium is a compact Class D stereo amplifier built around TI’s TPA3255 with NE5532 op-amps. It is sold with or without a power supply: the official store lists the base unit without PSU, while some retailers bundle a 32V/5A adapter and highlight parts such as ELNA and WIMA capacitors. Manufacturer specs include 0.05% THD, 103 dB SNR, and a headline “300 W × 2 (4 Ω, 10% THD+N)” which is a burst/marketing maximum rather than a continuous rating. A realistic complete-system price from the official store is about 90.98 USD (A07 Premium 60.99 USD without PSU + AIYIMA 32V/5A PSU 29.99 USD).

Scientific Validity

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• Independent measurements (A07 platform): Audio Science Review measured the original A07 at ~82–83 dB SINAD at 5 W/4 Ω with a 32 V supply, and roughly 70–80 W into 4 Ω at ~1% THD+N (both channels driven). This clears basic performance thresholds but doesn’t reach state-of-the-art transparency.
• Manufacturer specs (A07 Premium): THD 0.05%, SNR 103 dB, DC 24–48 V operation; 20 Hz–20 kHz FR.
• Context: The “Premium” variant has limited third-party lab data; given shared platform and components, it is expected to perform similarly to the earlier A07 unless new measurements show otherwise.

Technology Level

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A standard, competent TPA3255 implementation. NE5532 front-end, socketed op-amps for tweakability, and incremental component/thermal updates are practical rather than novel.

Cost-Performance

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Cheapest equal-or-better comparator: Fosi Audio V3 (includes 32 V PSU). Independent tests and the manufacturer’s spec sheet indicate equal or better THD+N/SINAD versus A07-class implementations. Typical price is 89.99 USD with the 32 V supply.
This product’s complete price (official store): ~90.98 USD (base 60.99 USD + official 32V/5A PSU 29.99 USD). The A07 Premium lands essentially at parity in out-the-door spend against the lowest-priced equal-or-better option, so the score sits at the top tier.

Reliability & Support

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Warranty/support are typical for budget brands. Build reports are generally acceptable for the price. Long-term reliability data remain limited. Confirm bundle contents (PSU included or not) before purchase.

Rationality of Design Philosophy

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The design aims to deliver near-transparent, low-cost amplification for simple two-channel setups. It prioritizes core performance over extras (e.g., no remote/balanced input), which is coherent for the price segment.

Advice

If you already own a suitable PSU or want the lowest up-front spend, A07 Premium is attractive. If you can allocate about ~0–30 USD more in some markets, Fosi V3 offers clearer measured performance while staying compact. A 48 V/5 A supply can add headroom but increases total system cost.

References

1. Audio Science Review — “AIYIMA A07 TPA3255 Review (Amplifier).” (Jan 1, 2021). Shows ~82–83 dB SINAD @5 W/4 Ω with 32 V, and ~70–80 W into 4 Ω near 1% THD+N. https://www.audiosciencereview.com/forum/index.php?threads/aiyima-a07-tpa3255-review-amplifier.18984/
2. AIYIMA Official Store — “A07 Premium.” Lists 60.99 USD base (no PSU), THD 0.05%, SNR 103 dB, DC 24–48 V, and PSUs as options. https://www.aiyima.com/products/a07-premium
3. AIYIMA Official Store — “AIYIMA 32V Power Supply.” 29.99 USD; DC32V/5A, 5.5×2.5 mm plug, 160 W rated. https://www.aiyima.com/products/aiyima-32v-ac100v-240v-adapter-dc32v-5a-eu-plug-us-plug-5-5-x-2-5mm-power-supply-charger-for-tas5613-tpa3255-tda7498e-amplifier
4. Amazon (US) — “AIYIMA A07 Premium … with DC 32V Power Adapter.” Listing text mentions ELNA/WIMA parts and 32 V adapter. https://www.amazon.com/AIYIMA-A07-TPA3255-Amplifier-Digital/dp/B08CJZGT6H
5. Audio Science Review — “Fosi Audio V3 Amplifier Review.” (Jun 20, 2023). Notes 89.99 USD with 32 V PSU and measurement results. https://www.audiosciencereview.com/forum/index.php?threads/fosi-audio-v3-amplifier-review.45757/
6. Fosi Audio — V3 product page. Lists SINAD ≥88 dB, SNR ≥110 dB, 32/48 V PSU options. https://fosiaudio.com/products/fosi-audio-v3-300w-x2-2-0-channel-hi-fi-stereo-audio-amplifier-with-tpa3255-chip
7. Amazon.co.jp — “AIYIMA A07 Premium …（32V/5A電源付き）.” Example JP retail bundle. https://www.amazon.co.jp/AIYIMA-A07-Premium-TPA3255-%E3%83%91%E3%83%AF%E3%83%BC%E3%82%A2%E3%83%B3%E3%83%97/dp/B0FH3WLP86
8. Amazon.co.jp — “Fosi Audio V3（32V電源付き）.” JP pricing example. https://www.amazon.co.jp/-/en/V3-Amplifier-TPA3255-Switchable-Integrated/dp/B0C36S8DCT

(2025.8.16)