Cayin RU7 DAC/Amp Dongle - Mint - Verified by HiFiLoop
The Audiophile's Hook
The Cayin RU7 is a rare breed in the dongle world: a fully discrete 1-bit DAC design built for musical flow, density, and realism—without the “clinical” edge many compact DACs can bring. This is a Mint (99% new) full-set unit, delivering flagship-style tone and drive for less than new pricing.
Condition Report (The Truth)
Mint / Collector Quality: Like new with minimal handling marks, ideal for clean desk setups and everyday carry.
- No obvious cosmetic defects observed.
Mandatory: The device has passed all functional tests.
Sonic Signature & Pairing
RU7 is designed around Cayin’s discrete 1-bit approach and “All-to-DSD” processing, aiming for a smooth, organic presentation with strong micro-dynamics and an effortless sense of flow. With both 3.5mm and 4.4mm outputs, it’s an easy match for sensitive IEMs and many portable headphones, especially when you want more body and texture on the go.
To unleash the full potential of this device, we recommend pairing it with gear from our Headphones Collection.
Technical Highlights (Mobile-Table)
| DAC Architecture | Discrete 1-bit resistor network design |
| Hi-Res Support | PCM up to 384kHz; Native DSD64–DSD256 |
| All-to-DSD Modes | Selectable DSD64 / DSD128 / DSD256 conversion |
| Outputs | 3.5mm single-ended + 4.4mm balanced; line-out supported |
| Output Power (@32Ω) | Up to 400mW (4.4mm) / 160mW (3.5mm) |
| Volume Control | 100-step discrete resistor volume (3 segments) |
| Size / Weight | 66 × 24 × 12 mm; 25 g |
What's in the Box
- Cayin RU7 dongle DAC/amp
- Full original retail set (box + original accessories)
Why Buy Used from HiFiLoop?
- ✅ 14-Day DOA: Full refund/replace if dead on arrival.
- 🔧 180-Day Warranty: Free repair service (buyer pays return shipping).
- 🔬 Lab Tested: I/O, noise floor, channel balance verified.
- 📦 Free Shipping: On orders over $199.
See full Grading Scale in Footer Condition Guide.
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Condition Report
See details in the description above.
Shipping & Warranty
Processing Time:
Please allow 3-5 business days for order processing. We perform a final rigorous audio test, functional inspection, and deep cleaning to ensure the device is in perfect condition before dispatch.
Shipping Method:
We use reliable International Priority Lines. Tracking numbers are provided once the item is dispatched.
Estimated Delivery:
7-15 business days to most destinations (USA, Europe, etc.).
Warranty & Support:
We stand behind our quality with a 180-Day Warranty.
- 0-14 Days: Full refund or replacement for any functional defects upon arrival.
- 15-180 Days: Free repair service for hardware issues (Buyer is responsible for return shipping costs and any applicable customs duties or taxes).
Tech Specs
Refer to official manufacturer specifications.