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Fast & Reliable Global Delivery

Hi-Fi audio shipped worldwide in 3-5 days via FedEx.

Innovative & User-Friendly Design

Minimal yet powerful—built for audiophiles.

True Studio-Grade Sound

Crystal-clear Hi-Res audio with LDAC and ESS DAC.

Crafted to Perfection in Korea

Precision engineering. Premium components. 100% Made in Korea.

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Shipping Policy

Order Processing Time All orders are processed within 1 to 2 business days (excluding weekends and holidays) after receiving your order confirmation email. You will receive another notification when your order has shipped.

Please note that during high-volume periods, processing may take an additional day.

Shipping Rates and Estimates We provide premium FedEx International Priority (Door-to-Door) service for all shipments to ensure fast and secure delivery.

Shipping Cost:
- Free Shipping: On all orders over $60 USD.
- Standard Shipping: Calculated at checkout for orders under $60 USD.
Estimated Delivery Time: 3 to 5 business days worldwide.
Service Type: Door-to-Door service via FedEx International Priority.

International Shipping We ship to most countries worldwide.

Please ensure your shipping address is entered correctly in English to avoid delivery delays.

Customs, Duties, and Taxes (Important) DoBlue (SLASH) is not responsible for any customs and taxes applied to your order. All fees imposed during or after shipping are the responsibility of the customer (tariffs, taxes, VAT, etc.).

Refused Shipments: If you refuse to pay customs duties and the package is returned to us, we will deduct the round-trip shipping costs from your refund.

How do I check the status of my order? When your order has shipped, you will receive an email notification from us which will include a tracking number you can use to check its status. Please allow 48 hours for the tracking information to become available.

Damages and Issues If your item arrives damaged, please save all packaging materials and damaged goods and contact us immediately at slash-shop@outlook.com so that we can file a claim with the carrier and arrange a replacement for you.

SLASH8 Q&A (FAQ)

Q1: Does SLASH8 support LDAC and aptX Lossless?

A1: Yes. SLASH8 supports LDAC, aptX Lossless, aptX Adaptive, aptX HD, AAC, and SBC for true hi-res wireless audio up to 24-bit/192kHz.

Q2: Can I use SLASH8 as a USB DAC for my computer?

A2: Yes. SLASH8 functions as a USB DAC via USB-C, supporting up to 96kHz/24-bit with noise isolation for clean and stable performance.

Q3: What outputs does SLASH8 provide?

A3: SLASH8 includes 4.4mm balanced, RCA line out, optical (TOSLINK), and coaxial outputs — compatible with hi-fi systems, amplifiers, and studio gear.

Q4: Does SLASH8 work with vintage amplifiers?

A4: Absolutely. SLASH8’s RCA and coaxial outputs make it ideal for vintage and modern hi-fi amplifiers.

Q5: Can I connect headphones directly to SLASH8?

A5: No. SLASH8 is designed as a receiver/DAC for amplifiers and speakers, not as a standalone headphone amplifier.

Q6: What is the Bluetooth range of SLASH8?

A6: Up to 30 meters (100 feet) in open space with stable wireless performance using a 2.4GHz external high-gain antenna.

Q7: How does SLASH8 reduce noise from PC USB power?

A7: SLASH8 integrates advanced USB isolators that block ground loop and EMI/RFI noise, ensuring clean and precise sound.

Q8: Is SLASH8 suitable for studio use?

A8: Yes. With its ESS ES9038Q2M SABRE DAC and balanced outputs, SLASH8 delivers reference-grade performance for studio engineers.

Q9: What is included in the box?

A9: SLASH8 main unit, high-gain antenna, USB-C cable (A to C), RCA cable, optical cable, and user manual.

Q10: Where is SLASH8 made?

A10: SLASH8 is 100% engineered and manufactured in Korea with CNC aluminum housing and premium components.

Q11: Will I need to pay customs duties or import taxes?

Q: Will I have to pay import duties?

A: For customers in the USA, EU, and UK, we are pleased to offer 0% import duties. Thanks to international trade agreements (FTA/ITA), you can enjoy our premium audio products without worrying about extra customs fees.

Q: Is VAT included in the price?

A: Our product prices do not include local VAT. Depending on your country's regulations (especially in the EU and UK), local VAT may be applied upon arrival or during the checkout process.

Q: Why is my order "Duty-Free"?

A: Our products fall under the HS Code (8517.62), which benefits from 0% duty rates in many regions including the US, EU, and UK. We handle all necessary documentation to ensure a smooth, duty-free transition through customs.

"While we strive for a smooth delivery, please note that local customs policies may result in minor import fees, which are the buyer's responsibility."

Q12: How is shipping handled?

A12: All international orders are shipped via FedEx door-to-door service. Delivery usually takes 3–5 business days depending on the destination.

SLASH3/5/6 Q&A (FAQ)

Q. In what situations is the Slash most recommended?

A. Slash delivers outstanding performance in the following scenarios:

• High-end car audio systems (Slash5 – with ground loop isolation)

• As a reference DAC for comparing amplifier sound signatures (Slash6)

• Minimalist mobile-based streaming setups like Tidal (Slash3 / 5 / 6)

• For users seeking pure high-fidelity sound without expensive gear (Slash3 / 5 / 6)

Q: Do I need to unplug or turn off the SLASH 3/5/6 when not in use?

A: No. It uses very little power in standby and can stay connected
without harm. For convenience, we recommend keeping it plugged in.

Q. What’s the difference between SLASH3, 5, and 6?

A. All models deliver clear, low-latency, high-quality Bluetooth sound.

Each model is designed with different use cases in mind—higher model
numbers include additional features and enhanced sound performance for
more demanding audio needs.

Q. Do I need to reconnect SLASH every time I use it?

A. No. SLASH automatically reconnects to the last paired device.

We recommend keeping it powered on for added convenience.

Q. Do I need to charge SLASH?

A. SLASH does not require charging. It stays powered via USB and uses very little current.

Q. What type of DC adapter should I use?

A. SLASH works with most adapters, but for stable performance, we recommend using a 5V 1A adapter (like a smartphone charger).

Q. I'm having trouble with the Bluetooth connection. What should I do?

A. SLASH supports 1:1 pairing. If it's already paired with another
device, press the MFB button on the back to reset, then pair again.

Q. Does Bluetooth stay connected when the device is out of sight?

A. If placed in an enclosed space, the signal may weaken. For best results, keep it in open space to minimize interference.

Q: Can I connect multiple devices at once?

A: This device supports one-to-one pairing only. To connect a different device, disconnect the current one and pair again.

Q. Only one side is producing sound, or there’s noise. How can I fix this?

A. Try switching the left and right RCA connectors.

If the issue flips sides, check your amp, cables, or source device

Q. I connected SLASH to my amplifier, but the sound is low.

A. Make sure the RCA connector is fully inserted. SLASH’s precision CNC jacks can feel tight at first, so push firmly.

Q. The sound distorts when my phone’s volume is at maximum.

A. SLASH is built to prevent distortion, but if you experience issues, try lowering your phone’s volume to around 80%.

This may be due to a low input level on your amplifier.

Q. Is SLASH6 USB DAC compatible with mac OS?

A. Yes! Simply connect via USB—your Mac will recognize it automatically, no drivers required.

Note: SLASH3 and 5 do not support USB DAC functionality.

Q. How do I connect an external DAC to the SLASH6?

A. Make sure your external DAC supports optical (Toslink) input.

Connect the SLASH6’s optical output to the DAC’s optical input.

The SLASH6 supports high-quality digital output at 24-bit / 96kHz.

Q. Will SLASH improve sound quality on a non-Bluetooth amp or low-spec audio receiver?

A. Yes. With high-resolution Bluetooth, premium DAC, and advanced
codecs, SLASH delivers cleaner, more dynamic sound you can clearly hear.

Q. Can I use SLASH with a tube amp, preamp, or vintage amplifier?

A. Yes. SLASH works great with tube amps, vintage gear, and preamps via RCA connection.

If your amp has wide RCA spacing, use the included adapter.

Q. Can I play music directly from USB?

A. No, SLASH doesn’t support internal playback.

To play via USB, connect to a laptop or PC and use SLASH6 as a USB DAC, or stream via Bluetooth (SLASH3/5/6).

SLASH4 Q&A (FAQ)

Q: Is setup complicated or straightforward?

A: Setup is simple. Just connect the included 3.5mm cable to your car’s
AUX port and SLASH4, plug in the USB power, and pair your phone via
Bluetooth. You’re ready to play music.

Q: What should I do if the LED power light does not turn on?

A: First, check if your USB power source is working properly. If you're
using a car cigarette adapter, try switching to a different USB port or
charger.

Q: How do I use the reset button?

A: While powered on, press the reset button briefly. Do not hold it down for more than a second.

Q. Will there be any noise or interference when using it in a car?

A. SLASH4 is optimized for in-car use with a built-in noise isolation
circuit, ensuring clean and clear sound without interference.

Q. Will it make a big difference with my car’s BOSE audio system?

A. Absolutely. SLASH4 delivers far clearer and more detailed sound than
standard Bluetooth. Many users have said it completely brought their
BOSE system back to life.

Q: The LED is on, but there’s no sound. What should I do?

A: Make sure the AUX cable is fully inserted. You should hear a “click”
when it’s properly connected. A loose connection can cause silence even
if the LED is on.

Q: Is SLASH4 compatible with all car models?

A: Yes, it works with any car that has an AUX input. However, SLASH4 may
not work properly with Android Auto or Apple CarPlay. For best results,
use it as a standalone Bluetooth device.

Q: Does SLASH4 remember the last connected device?

A: Yes, it automatically reconnects to the last paired device when powered on.

Q: Can I use my car’s USB port for audio playback?

A: No, the USB port is for power only.

To play audio, use the included 3.5mm AUX cable and pair your phone via Bluetooth.

Some cars won’t detect audio through USB—this is normal.

Q. I connected SLASH4 to a car with built-in Bluetooth, but there's no sound. What should I do?

A. If the car’s built-in Bluetooth is still active for audio on your phone, SLASH4 may not output sound even when connected.

Try one of the following:

Remove the car’s built-in Bluetooth from your phone’s paired devices

Or, disable only the audio function for the car’s Bluetooth in your phone settings

If there’s still no sound, the car’s AUX port may be faulty.

To check, connect SLASH4 and lightly touch the AUX cable tip.

If you hear a buzz, the port works. If not, it may need service.

Q: Can I use SLASH4 with Android Auto or Apple CarPlay?

A: We recommend using SLASH4 independently for better sound. Android Auto and CarPlay may interfere with audio performance.

Q: Can I use SLASH4 at home, not just in a car?

A: Absolutely. SLASH4 works with any amplifier or speaker system with an AUX input. Just power it via USB and pair your device.

Q: Does the sound get distorted at high volume?

A: SLASH4 is designed to prevent distortion. If you notice any, lower
your phone’s volume to around 80%—it may be due to your car amp’s input
level

Q. What kind of cable should I use for the optical output?

A. Use a Toslink optical cable with a 3.5mm mini plug on one end and a standard square Toslink connector on the other.

This type is often referred to as a "Mini Toslink to Toslink" cable and is commonly used with mini optical ports.

Q. How effective is SLASH4’s noise isolation?

A. SLASH4 features advanced noise isolation to reduce even subtle noise
from the power source, ensuring a clearer and more immersive listening
experience.

Q. Can I use SLASH4 with a power bank?

A. Yes, you can use SLASH4 with a USB power bank, making it easy to use on the go or in outdoor settings.

Q: Which sounds better—AUX or optical input?

A: SLASH4’s DAC offers better sound quality compared to DSP DACs
typically used with optical. AUX input is recommended for richer sound

Q: How does SLASH4 handle iPhones or iPads?

A: iPhones and iPads use AAC codec by default. SLASH4 automatically selects AAC when pairing with Apple devices.