Our verdict
The A5 is Douk Audio's best-selling amp: a compact TPA3255 class D stereo amplifier for $89.99 with the 32V/5A adapter ($109.99 with 48V/5A). Its standout feature is an adjustable 30–200Hz high-pass filter, which takes deep bass off small speakers so a subwoofer can handle it through the 3.5mm output. It has two swappable NE5532 op-amps under a glass panel, PFFB feedback, a 4-layer PCB and LED lighting, and it's rated 4.8/5 from 39 store reviews. Downsides: one RCA input only, no Bluetooth, no tone controls or remote, and the '300W×2' headline is a maximum; Douk's table lists 78W per channel into 4 ohms with the included adapter. Get the A5 PRO if you want Bluetooth, tone controls and a headphone jack.
Our score is an editorial judgement based on published specs, store policies and customer ratings, not lab or hands-on tests. How we score
Pros & cons
Pros
- $89.99 for a TPA3255 amp with PFFB
- Adjustable 30–200Hz high-pass filter for 2.1 systems
- 3.5mm AUX output for a powered sub or second amp
- Swappable NE5532 op-amps under a glass panel
- Small (95×92×50 mm) and light (506 g)
- Rated 4.8/5 from 39 store reviews
Cons
- One stereo RCA input; no Bluetooth
- No tone controls, remote or headphone jack
- "300W×2" is a maximum: 78W/channel (4Ω) with the included 32V adapter
- 48V adapter costs $20 more for 120W/channel
Overview
The Douk Audio A5 is the #1 best seller on Douk Audio's store. It's a small TI TPA3255 class D stereo amplifier designed for passive speakers, with an adjustable high-pass filter and swappable op-amps as its two party tricks.
This review is based on Douk Audio's product page, policies and store ratings as of October 2026. We haven't used the A5 ourselves.
Key features
Per Douk Audio:
- TPA3255 with PFFB: post-filter feedback and a 4-layer immersion gold PCB to lower distortion (THD+N 0.002%, SNR ≥114dB).
- High-pass filter, 30–200Hz: trims bass from the main speakers for a cleaner sound with small bookshelf speakers.
- 3.5mm AUX output (3.7V): feed a powered subwoofer or a second amp.
- Swappable op-amps: two NE5532 chips under a tempered glass panel; Douk lists 2134, 2604, 2068 and MUSES02 as upgrades.
- Look: transparent top with adjustable internal LED lighting.
Inputs and outputs: one stereo RCA input; banana speaker jacks and the 3.5mm AUX output. There's no Bluetooth, remote, tone control or headphone jack.
Real power output
The "300W×2" on the product title is a maximum. Douk's own rated-power table:
| Power supply | 4Ω | 6Ω | 8Ω |
|---|---|---|---|
| 32V/5A (included, $89.99) | 78W×2 | 71W×2 | 65W×2 |
| 36V/6A | 107W×2 | 100W×2 | 94W×2 |
| 48V/5A (included, $109.99) | 120W×2 | 110W×2 | 102W×2 |
For most bookshelf speakers, the 32V version is enough. Pick the 48V version for less sensitive speakers or larger rooms.
Ratings
The A5 shows 4.8/5 from 39 reviews on Douk Audio's store. Douk's Trustpilot profile has only two reviews; see our Douk Audio review.
Price, shipping and returns
- Price: $89.99 with a 32V/5A adapter, $109.99 with a 48V/5A adapter.
- Shipping: typically 2–8 business days internationally, duties included at checkout unless noted.
- Returns: request within 30 days of delivery; approval needed, complete and in good condition. Original shipping isn't refunded, and you'll likely pay return shipping if you change your mind.
- Warranty: 24 months for manufacturing defects, per Douk's warranty page (an older policy page says 1 year).
Alternatives
- Douk Audio A5 PRO ($114.99): same TPA3255 platform plus Bluetooth 5.1, bass/treble and a headphone jack, but no high-pass filter. See A5 vs A5 PRO.
- Ampapa D1 ($199.99): built on the A5 with a digital VU screen, aptX HD Bluetooth, balanced TRS input and a remote.
- ST-01 PRO ($109.99): tube hybrid amp with a built-in DAC and VU meter.
All are compared in best Douk Audio products.
The bottom line
The Douk Audio A5 packs a TPA3255 amp, PFFB and a genuinely useful high-pass filter into an $89.99 box, with strong store reviews. It's a good pick for a budget 2.1 system with a separate DAC or streamer. Just read the rated power table, not the 300W headline, and know you'll need another source for Bluetooth. Our verdict: 7.9/10.
Specifications
| Amp chip | TI TPA3255 class D with PFFB |
|---|---|
| Input | Stereo RCA (2V sensitivity) |
| Outputs | Banana speaker jacks, 3.5mm AUX (3.7V) |
| High-pass filter | 30–200Hz, adjustable |
| Rated power (4Ω) | 78W×2 (32V/5A), 107W×2 (36V/6A), 120W×2 (48V/5A) |
| Rated power (8Ω) | 65W×2 (32V/5A), 94W×2 (36V/6A), 102W×2 (48V/5A) |
| Max power | 300W×2 (4Ω, per Douk) |
| THD+N / SNR | 0.002% / ≥114dB |
| Speaker impedance | 4–8Ω |
| Size and weight | 95×92×50 mm, 506 g |
| Price | $89.99 with 32V/5A adapter; $109.99 with 48V/5A |
| Store rating | 4.8/5 (39 reviews) |
