RA-Mini Compact Class D Amplifier — Owner’s Manual
RA-Mini Compact
Class D Amplifier
Everything you need to set up, connect, and get the best sound from your RA-Mini.
Introduction & Overview
Welcome to the Radique Audio RA-Mini Compact Class D Amplifier — a powerful, versatile, and remarkably compact stereo amplifier designed to bring your passive speakers to life.
Whether you’re building a desktop audio setup, upgrading a bedroom system, or adding a secondary listening zone to your home, the RA-Mini delivers clean, efficient amplification in a package small enough to sit in the palm of your hand.
Sold and supported by Radique Audio, Ottawa’s home for quality audio gear — new, vintage, and everything in between.
What’s in the Box
Your RA-Mini package includes:
- RA-Mini Compact Class D Amplifier
- External power supply (DC 19V / 3.47A, 65W)
- Power cable (region-appropriate)
- Speaker wire terminals (pre-installed gold-plated binding posts)
- Quick-start card with QR code linking to this online manual
Who Is the RA-Mini For?
Perfect for:
- Audiophiles seeking a compact, high-quality amplifier for a secondary system
- Desktop or bookshelf speaker setups (home office, bedroom, studio)
- Anyone upgrading from a receiver to a dedicated stereo amp
- Multi-room audio enthusiasts who want an affordable zone amplifier
- Vintage audio fans pairing modern amplification with classic speakers
- New listeners building their first serious stereo system on a budget
Not ideal for:
- Large room, high-volume applications requiring more than 50W per channel
- Passive subwoofer-only setups (no dedicated subwoofer pre-out)
- Home theatre surround sound systems (stereo only)
Speaker Compatibility
The RA-Mini is designed to drive passive (unpowered) speakers. It is not compatible with active (powered/self-amplified) speakers for its speaker output connections.
Impedance
- Optimal range: 4–8Ω
- Functional range: 3–10Ω
- Speakers outside this range may result in reduced performance or trigger thermal protection
Sensitivity & Power Matching
The RA-Mini delivers 50 watts per channel into 4Ω. For best results:
- Bookshelf and desktop speakers (85–92 dB sensitivity): Excellent match
- Floor-standing speakers (88–95 dB sensitivity): Works well in small to medium rooms
- High-sensitivity speakers (95+ dB): Outstanding match with headroom to spare
- Low-sensitivity speakers (below 84 dB): May be underpowered in larger spaces
Speaker Terminal Compatibility
The RA-Mini features gold-plated 5-way binding posts that accept:
- Banana plugs — including Radique Audio banana plugs
- Spade connectors — including Radique Audio spade connectors
- Pin connectors — including Radique Audio pin connectors
- Bare wire (stripped speaker cable)
Getting Connected
⚠️
The recommended first-time setup sequence:
- 1With the RA-Mini unplugged, connect your speakers to the binding posts
- 2Connect your source components (CD player, turntable, etc.) to the appropriate inputs
- 3Plug the RA-Mini’s power supply into a surge-protecting power bar that is switched off
- 4Plug the surge-protecting power bar into a wall outlet
- 5Turn on the power bar, then power on the RA-Mini
Step 1: Position Your Amp
Place the RA-Mini on a stable, level surface with at least 2–3 inches of clearance on all sides for ventilation. Avoid enclosed cabinets without airflow.
Step 2: Connect Your Speakers
- Loosen the binding post terminals on the rear of the amp
- Connect your right speaker cable to the R+ (red) and R− (black) terminals
- Connect your left speaker cable to the L+ (red) and L− (black) terminals
- Tighten the binding posts firmly
- Double-check polarity — ensure positive (+) connects to positive and negative (−) to negative on both ends
Step 3: Connect Your Source
Choose your preferred input method (see Section 6) and connect accordingly before powering on.
Step 4: Power On
Press and hold the volume knob to power on. The LCD display will illuminate and show the active input mode.
⚠️
Input Sources
The RA-Mini gives you five ways to connect. Press the Mode (M) button to cycle between them.
Stream from Spotify, Apple Music, YouTube, or any app. Bluetooth 5.0 provides stable connectivity in typical home environments. Your source device’s volume slider controls the overall system volume when streaming.
Use standard red/white RCA cables. Note: if connecting a turntable directly, ensure it has a built-in phono preamp — the RA-Mini does not include a phono stage.
Use a standard 3.5mm stereo audio cable. Works with any device that has a headphone or line output.
Input Summary
| Input | Type | Formats | Best Use |
|---|---|---|---|
| Bluetooth 5.0 | Wireless | MP3, AAC, SBC | Streaming from phone/tablet |
| RCA Stereo | Analog | Any (pre-converted) | CD players, turntables, DACs |
| 3.5mm AUX | Analog | Any (pre-converted) | Computer, tablet, portable player |
| USB Audio | Digital | MP3, WAV, FLAC, WMA, APE | Flash drive playback |
| TF Card / MicroSD | Digital | MP3, WAV, FLAC, WMA, APE | Standalone offline playback |
Technical Specifications
| Output Power | 50W per channel @ 4Ω (100W total stereo) |
| Amplifier Class | Class D (high efficiency, minimal heat) |
| Speaker Impedance | 4–8Ω optimal; 3–10Ω functional range |
| Thermal Performance | Passive cooling (no fan, completely silent) |
| Thermal Safety | Automatic overheating protection |
| Dimensions | 100mm × 100mm × 50mm | 3.94″ × 3.94″ × 1.97″ |
| Weight | 160g (5.6 oz) |
| Chassis | High-quality plastic (durable, lightweight) |
| Finish Options | High Gloss Black, Faux Wood Grain Walnut |
| Feet | Metal feet for ventilation and aesthetic placement |
| Input | AC 100–240V, 50–60Hz (worldwide auto-switching) |
| Output | DC 19V / 3.47A (65.93W) |
| Connector | 5.5mm × 2.5mm barrel jack (center-positive) |
| Cable Length | ~1.2 meters |
| Certifications | CE, FCC approved |
| Chip | AC6926A (Jieli Technology) |
| SNR | ≥95 dB |
| Frequency Response | 20Hz – 20kHz (full audible spectrum) |
| Dynamic Range | 90 dB |
| Supported Formats | MP3, WAV, FLAC, WMA, APE |
| Version | Bluetooth 5.0 |
| Range | Minimum 12 meters (line-of-sight, barrier-free) |
| Pairing | Simple — press Mode button, pair device, auto-reconnects |
| Compatibility | iOS, Android, Windows, Mac, Linux |
| Speaker Terminals | Gold-plated 5-way binding posts |
| Compatible Connectors | Banana plugs, spade connectors, pin connectors, bare wire |
| Speaker Compatibility | Passive speakers (4–8Ω optimal) |
| Power Delivery | Full 50W per channel @ 4Ω |
| Previous / Rewind (◀) | Skip to previous track (USB/TF Card modes) |
| Play / Pause (II) | Pause playback |
| Mode Button (M) | Cycle through inputs: Bluetooth → USB → TF Card → AUX |
| Next / Forward (▶) | Skip to next track (USB/TF Card modes) |
| Volume Knob (Rotary) | Clockwise = increase; counterclockwise = decrease. Press and hold to power on/off. |
| Digital LCD Display | Shows input mode, volume level, Bluetooth status |
| Operating Temperature | 0°C to 40°C (32°F to 104°F) |
| Storage Temperature | -20°C to 60°C (-4°F to 140°F) |
| Humidity | Standard room humidity (no special requirements) |
| Ventilation | 2–3 inches clearance on all sides recommended |
Power & International Use
The RA-Mini features universal voltage input (100–240V, 50–60Hz), meaning it automatically adapts to power systems worldwide. No converter needed — just replace the power cable to match your local wall outlet.
- Works in any country without voltage conversion
- Automatically detects and adjusts to local AC power
- No extra equipment required
- Safe and reliable operation globally
When Travelling Internationally
- Swap the power cable for one matching your destination’s outlet type
- Confirm the outlet is 100–240V compatible (standard in most countries)
- Plug in and power on — no setup changes needed
⚠️
Front Panel Controls
Power On / Off
Press and hold the volume knob to power the unit on or off.
Volume Control
Rotate the volume knob clockwise to increase volume, counterclockwise to decrease.
Selecting Your Input
Press the Mode (M) button to cycle through available inputs:
Track Navigation (USB & TF Card Modes)
- Press ◀ to skip to the previous track
- Press ▶ to skip to the next track
- Press II to play or pause
LCD Display
The backlit LCD display shows:
- Currently active input mode
- Volume level
- Track information (USB/TF Card modes)
- Bluetooth pairing/connection status
Subwoofer Compatibility
The RA-Mini works with active subwoofers that feature high-level inputs and outputs. This is common on quality modern subs.
How to Connect
- 1Connect the speaker outputs from the RA-Mini to the subwoofer’s high-level inputs
- 2Connect a second set of speaker cables from the subwoofer’s high-level outputs to your main speakers
- 3The subwoofer’s internal crossover handles bass separation automatically
- 4Result: full bass integration — no dedicated subwoofer output required
Bluetooth Streaming
Pairing Your Device
- 1Power on the RA-Mini and press Mode until the display shows Bluetooth mode
- 2On your phone or device, open Bluetooth settings
- 3Select “RA-Mini” (or similar) from the list of available devices
- 4Pairing is complete — the amp will auto-reconnect to this device in future sessions
Tips for Best Performance
- Keep your source device within 12 meters of the amp for optimal signal
- Walls, furniture, and appliances can reduce effective range
- Your phone or tablet’s volume slider controls the overall system volume when streaming
Basic Troubleshooting
The following quick checks resolve the most common situations. Still need help? Contact us at [email protected] or call 613 416-9995 — our Ottawa-based team is happy to assist.
- Confirm the power supply is firmly seated in the DC barrel jack on the rear of the amp
- Confirm the power supply is plugged into a live outlet or surge bar that is switched on
- Press and hold the volume knob for 2–3 seconds
- Confirm the correct input is selected — press Mode to cycle until your source is active
- Check that speaker cables are firmly connected with correct polarity (red to red, black to black)
- Confirm the source device is playing audio and its volume is turned up
- Verify the RA-Mini’s volume is not at zero
- Reduce the volume level — high volumes can cause distortion with lower-sensitivity speakers
- Check that speaker cable insulation is not touching between positive and negative terminals (potential short circuit)
- Try a different input source to rule out the source device as the cause
- Press Mode until the display shows Bluetooth mode
- On your phone, go to Bluetooth settings, forget any previous “RA-Mini” pairing, then search again and re-pair
- Ensure your source device is within range (12 meters, minimal obstructions)
- Disable Bluetooth on nearby devices that may have previously paired with the RA-Mini
- Move the source device closer to the amp and reduce obstructions
- Reduce interference from nearby Wi-Fi routers or other Bluetooth devices
- On your phone, toggle Bluetooth off and back on, then reconnect
- The RA-Mini has automatic thermal protection that shuts it down if it overheats
- Ensure at least 2–3 inches of clearance on all sides — do not place in an enclosed cabinet without airflow
- Allow the amp to cool for a few minutes before powering back on
- Confirm files are in a supported format: MP3, WAV, FLAC, WMA, or APE
- Ensure files are stored in the root directory of the USB drive or TF card, not inside subfolders
- Try a different USB drive or TF card to rule out a media issue
Warranty & Support
The RA-Mini Amp comes with a 1-year manufacturer warranty covering defects in materials and workmanship.
- Duration: 1 year from date of purchase
- Covers: Manufacturing defects, component failures, and performance issues
- Does not cover: Accidental damage, misuse, water damage, or normal wear and tear
How to Claim
- Keep your receipt and documentation — required for warranty claims
- Contact our local tech support — we’re here to help with any issue
- Return or repair — defective units can be repaired or replaced under warranty
Ottawa-Based Support — Our Differentiator
We stand behind the RA-Mini with direct, responsive local tech support from our Ottawa team. No outsourced support — just direct access to experts who know the product inside and out.
Email: [email protected]
Phone: 613 416-9995
Website: radique.com
Conclusion & Next Steps
The RA-Mini delivers impressive amplification in a compact, versatile package.
- Compact yet powerful (50W per channel) — perfect for bedrooms, offices, or smaller living spaces
- Multiple input options — Bluetooth, RCA, AUX, USB, and TF Card
- Active subwoofer compatible — full bass management through high-level connections
- Built to last — 1-year warranty backed by local Ottawa-based support
Your Next Steps
- 1Always make connections with the power off — before connecting any speakers or source components
- 2Verify your speaker compatibility — confirm speakers are passive (unpowered) and check impedance ratings
- 3Plan your connections — decide which input sources you’ll use
- 4Get in touch — questions? Contact our Ottawa-based Radique team at [email protected] or 613 416-9995
The RA-Mini is waiting to transform your audio experience. Start streaming, start enjoying, and discover what quality amplification can do for your favourite music.
© 2026 Radique Inc. | radique.com | [email protected] | Ottawa, ON