FiiO M33 R2R Music Player Review
A music player that HiFiGO lists at $699.99 in Retro Golden, Dark Blue or Black. The pictures give Android 13, a FiiO-developed R2R DAC, a Snapdragon 680 chip, a 5.5-inch screen, 3.5mm and 4.4mm outputs and a 4400mAh battery. It suits listeners who want output power pictured at both 32Ω and 300Ω.

Our verdict
A fit for listeners who want an Android 13 player with 3.5mm and 4.4mm outputs, a coaxial output and USB DAC mode at $699.99, with output power pictured at both 32Ω and 300Ω. Look elsewhere if you want a specification list written as text, or copy that consistently names the M33 R2R: picture 00 prints M27 and picture 20 compares with an M23. Every spec figure is a pictured claim on HiFiGO's page, and no independent test was checked for this review.
- Best for
- Listeners who want an Android player with 3.5mm and 4.4mm outputs and output power pictured at two loads.
- Skip if
- You want a specification list as text or copy that consistently names the M33 R2R.
Why 3.3/5: Held back by specification pictures with no text version, by many text pictures that were not opened here, by the store's own terms contradicting each other, and because no independent test was checked for this review: every figure is the store's own.
HiFiGO lists the FiiO M33 R2R, a music player, at $699.99 in Retro Golden, Dark Blue and Black. Its description is 31 pictures, some printed in Chinese, and they give Android 13, a FiiO-developed R2R DAC, a Qualcomm Snapdragon 680 chip, 8GB of RAM and 128GB of ROM, a 5.5-inch 1080x2160 screen, 3.5mm and 4.4mm headphone outputs, a coaxial output and a 4400mAh battery.
Specifications
| Spec | Page says (text and pictures) |
|---|---|
| Main chip | Qualcomm Snapdragon 680 |
| System | Android 13 |
| DAC | FiiO self-developed R2R DAC; Differential Complementary 24Bit R2R Resistor Array |
| USB chip | XMOS XU316; 10-band PEQ adjustment, supports AUTOEQ |
| Screen | 5.5 inch (1080x2160) |
| Memory | RAM 8GB; ROM 128GB (actually usable approx. 112GB); supports 2TB TF card |
| Battery | 4400mAh; 15.5h single-end, 13.5h balanced; 1.5h charge time |
| Bluetooth | Receive 5.0 SBC/LDAC; transmit 5.0 SBC/aptX/aptX HD/LDAC/LHDC |
| Playback | Local 384kHz/32bit, DSD256 (Native); USB DAC 768kHz/32bit, DSD512 (Native) |
| Coaxial output | 384kHz/24bit; DSD128 (DOP/D2P) |
| Balanced output power (at least) | 32Ω: 1100mW+1100mW big-ear mode, 900mW+900mW high gain; 300Ω: 240mW+240mW, 165mW+165mW |
| Single-ended power (at least) | 32Ω: 470mW+470mW big-ear mode, 300mW+300mW high gain |
| Frequency response | 20Hz-40kHz, attenuation under 3dB |
| Size and weight | Approx. 138.2x71.5x17mm; approx. 258g |
Options and pricing
Three colors are listed at $699.99 each, all orderable when the page was read: M33 R2R Retro Golden, M33 R2R Dark Blue and M33 R2R Black. The box list in the pictures names the player, a leather case and tempered glass film (both fitted at the factory), a USB data cable, a Quick Start Guide and a GPL V2 manual. A render shows a rear label reading Model F1001M and Input 5V-3A.
How it compares
The HiBy RS2 II R2R HiFi Pure Audio Player is also named an R2R player and is listed at $439, and the SHANLING M1 Plus ES9069Q Bluetooth 5.2 Portable Music Player at $209, against $699.99 here. The iBasso DX340 Digital Audio Player starts at $1,999, the highest of the four prices. Choose the M33 if you want output power pictured at both 32Ω and 300Ω; look at the RS2 II or M1 Plus on a tighter budget.
Shipping, returns and warranty
HiFiGO sells from hifigo.com and says every order leaves its warehouse in China, usually 1-3 business days after it is placed, and says its delivery times are estimates, not promises. Its shipping policy gives the United States 1-2 weeks (about 10 days on average) by Priority and 6-10 days by Premium, both with duties and taxes prepaid by the store; Canada 2-3 weeks; the United Kingdom 1-2 weeks; and Australia 10-15 days. Express couriers (DHL, UPS, FedEx) take 3-7 days, but then the buyer pays any duties and taxes. No shipping page names New Zealand, PO boxes are not accepted, and the free-shipping thresholds differ between the store's own pages, so check the cart. One of its two shipping pages adds that a lost parcel on an order above $50 gets only a 50% refund. A US buyer reported a $40 tariff charge in August 2025, after which HiFiGO said it had added a customs notice at checkout.
Read the return terms before you order. The homepage advertises 7-day returns. Both of HiFiGO's policy pages offer a 7-day dead-on-arrival cover (a replacement or a full refund, with the return postage refunded) and also describe 30-day returns, but a request made 7 to 30 days after delivery loses 30% of the MSRP as a restocking fee (10% more if the packaging is incomplete), plus shipping both ways and duties, and the FAQ on the same pages says there is no refund or exchange once 7 days have passed. One version recommends reselling an opened product locally. Custom IEMs and custom cables cannot be returned, no return address is published, and buyers describe sending items back to China.
HiFiGO's warranty runs one year from the order date for parts and labor; its policy names desktop DACs and amps, IEMs and dongles at one year and gives cables and adapters three months. HiFiGO decides between repair and replacement, the buyer pays the shipping, and faulty items go back for service, not for a refund. Claims go to [email protected], the only contact the store lists: its pages name no company, street address or phone, and its terms are governed by the laws of China.
FiiO's own notice "A letter to FiiO fans" (undated) lists HiFiGo among sellers it has not authorized and recommends buying FiiO products from local agents. FiiO says it still services genuine products bought from such sellers if the buyer emails [email protected], but the buyer pays the freight and duties if a unit must go back to China.
On Trustpilot, HiFiGO had 4.6 out of 5 from 378 reviews when we checked on 2026-10-28 (91% five-star, 5% one-star), and it had replied to about 75% of negative reviews; Trustpilot notes the store has not invited customers to review recently. The one-star reviews mostly concern the short return window and the deductions on returns, items listed in stock that turned out back-ordered, slow email support and a tariff charge on a US delivery in 2025. HiFiGO says its products are genuine and come in the brands' retail packaging; it does not claim to be an authorized dealer.
What we liked
- Output power is pictured with loads and modes: at least 900mW+900mW at 32Ω balanced (high gain) and at least 165mW+165mW at 300Ω (high gain)
- 3.5mm and 4.4mm headphone and line outputs, a coaxial output and a USB audio output, per the pictures
- Android 13 on a Snapdragon 680 with 8GB of RAM and 128GB of ROM, and support for a 2TB TF card, per the pictures
- USB DAC mode listed in a picture at 768kHz/32bit and DSD512 (Native)
- Bluetooth receive and transmit with LDAC; transmit also lists aptX, aptX HD and LHDC, per a picture
- Three colors at one price: Retro Golden, Dark Blue and Black
Worth noting
- The description is 31 pictures with no specification text, and the spec table and the box list are printed in Chinese, so the labels read here are translations
- Picture 00 prints M27 in one sentence and picture 20 compares battery life with an M23, although this listing is the M33 R2R
- Battery figures (15.5h single-end, 13.5h balanced) rest on a footnote crediting FiiO Laboratory, which adds that actual results may vary slightly
- Several power figures use a big-ear mode (our translation of a Chinese label) that the pictures we read do not explain
Questions before you buy
How much output power does the M33 R2R list, and at what loads?
A Chinese-language spec picture gives, with THD+N under 1%, balanced output of at least 1100mW+1100mW at 32Ω (6Vrms, big-ear mode, our translation of the label) and 900mW+900mW at 32Ω (5.4Vrms, high gain), and 240mW+240mW and 165mW+165mW at 300Ω (8.5Vrms and 7Vrms). Single-ended output is at least 470mW+470mW and 300mW+300mW at 32Ω (3.9Vrms and 3.1Vrms).
Which wireless and digital formats does it list?
Per a Chinese-language spec picture: Bluetooth receive 5.0 with SBC and LDAC; transmit 5.0 with SBC, aptX, aptX HD, LDAC and LHDC. Local playback is 384kHz/32bit and DSD256 (Native), USB DAC is 768kHz/32bit and DSD512 (Native), and the coaxial output is 384kHz/24bit and DSD128 (DOP/D2P).
What battery life and charging does the page list?
A picture lists a 4400mAh battery with 15.5h single-end and 13.5h balanced, a 1.5h charge time and 30W low-temperature charge pump fast charging. Its footnote credits FiiO Laboratory data and says actual results may vary slightly.
Where does HiFiGO ship from, and how long does it take?
From its warehouse in China, usually 1-3 business days after the order. The shipping policy gives 1-2 weeks to the US by Priority (6-10 days by Premium), both with duties and taxes prepaid, 2-3 weeks to Canada, 1-2 weeks to the UK and 10-15 days to Australia. Express couriers take 3-7 days, but the buyer pays any duties.
Can I send it back if I change my mind?
HiFiGO gives 7 days to report an item that arrives dead, damaged or wrong. Its policy also describes 30-day returns, but requests 7 to 30 days after delivery lose 30% of the MSRP plus shipping both ways and duties, and the FAQ on the same page says no refund or exchange after 7 days. Ask [email protected] before you open the box.
What warranty does HiFiGO give?
One year from the order date for parts and labor, for faults in build or materials (the policy names desktop DACs and amps, IEMs and dongles; cables and adapters get three months). HiFiGO chooses repair or replacement, the buyer pays the shipping, and a faulty item is serviced rather than refunded. Claims go to [email protected].
Sources & verification
What this review is based on and the day we last read it. Specs and claims from the maker are the maker’s own; the verdict and the rating are ours.
From the maker
- FiiO: A letter to FiiO fans (seller notice)Undated FiiO notice listing HiFiGo among unauthorized third-party sellers; FiiO still services genuine unitsRead October 28, 2026
From the store
- FiiO M33 R2R Portable Music Player product page: specs, options and price (the buy buttons go there)Specs, options and the listed priceRead October 28, 2026
- HiFiGO shipping policyShips from China in 1-3 business days; US 1-2 weeks by Priority or 6-10 days by Premium, duties prepaid; Express buyers pay dutiesRead October 28, 2026
- HiFiGO shipping and order tracking pageA second shipping text: Premium also for Canada and Australia, Canada free shipping from $99.99, lost-parcel rulesRead October 28, 2026
- HiFiGO refund policy7-day dead-on-arrival cover; 30-day returns minus a 30% restocking fee; its FAQ says no refund after 7 daysRead October 28, 2026
- HiFiGO warranty and refund policyWarranty by product class (1 year; cables and adapters 3 months); 30% fee for resealing an opened productRead October 28, 2026
- HiFiGO terms of serviceOperator named only as HiFiGo; governed by the laws of China; contact [email protected]Read October 28, 2026
Independent
- HiFiGO reviews on Trustpilot4.6 of 5 from 378 reviews (91% five-star, 5% one-star); the store has not invited reviews recentlyRead October 28, 2026
What we couldn’t verify
- CONFLICT: picture 00 prints M27 in a sentence about a DAPS audio purification system, and picture 20 compares battery life with M23, although this listing is the M33 R2R.
- Pictures 28 and 29 (the box list and the spec table) are in Chinese and their labels were translated for this review, including big-ear mode, which three of the six output power figures name and the pictures read for this review do not explain; the battery figures cite a FiiO Laboratory footnote.
- A repair card in the box picture carries Chinese print on a one-month replacement and a two-year free warranty, and says the local sales agent's rules apply; those terms were not checked.
- HiFiGO's policy pages contradict each other: 30-day returns with a 30% restocking fee in one place, no refund or exchange after 7 days in the FAQ.
- HiFiGO's pages name no company, street address or phone number; the only contact given is [email protected].
- FiiO's undated seller notice lists HiFiGo as an unauthorized seller; FiiO says it still services genuine units, with freight and duties paid by the buyer.
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