Hi-Fi Sound, Redefined for Every Moment – DoBlue

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Fast & Reliable Global Delivery

Hi-Fi audio shipped worldwide in 3-4 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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Precision Sound. Professional Design.

Engineered for Studio-Grade Audio

Experience ultra-clear and balanced sound with Slash.

Perfect for audio production, critical listening, and high-end playback.

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Our Most Loved Products

Chosen with Care, Loved by Many

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SLASH3

SLASH3

$99.00 USD

$99.00 USD

SLASH4

SLASH4

$79.00 USD

$79.00 USD

SLASH5

SLASH5

$119.00 USD

$119.00 USD

SLASH6

SLASH6

$149.00 USD

$149.00 USD

SLASH-T

SLASH-T

$59.00 USD

$59.00 USD

Cable No. 1 - doblue

Cable No. 1

$45.00 USD

$45.00 USD

Cable No. 2 - doblue

Cable No. 2

$45.00 USD

$45.00 USD

Cable No. 3 - doblue

Cable No. 3

$9.90 USD

$9.90 USD

Our Premium Quality Audio Philosophy

We are committed to delivering the best Bluetooth audio quality by incorporating 10 years of real-world feedback from Slash customers. Our products are developed in collaboration with audio engineers who have over 20 years of experience and award-winning product designers. Crafted by these experts in Korea, the Slash series is a true reflection of premium audio mastery. You can enjoy it with complete confidence—100% made in Korea.

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Slash3, 5 & 6 Product FAQs

Q: What are the main differences between Slash3, Slash5, and Slash6?

A: Each model has unique features:
- Slash3: Optimized for basic Hi-Fi streaming with RCA output.
- Slash5: Includes enhanced Bluetooth range and multi-device pairing.
- Slash6: Adds optical in/out and USB DAC for advanced setups.

Q: Are Slash3 and Slash6 compact enough for small spaces?

A: Yes! Slash3’s compact size of 0.47 x
1.69 x 1.73 inches delivers powerful sound in a small footprint. Similarly,
Slash6 fits seamlessly into any setup, providing high-quality audio without
taking up much space.

Q: How can I identify the left and right RCA connectors?

A: The right RCA connector is usually
marked with red. Inside the plug, the red indicates the right channel, and the
left is typically marked with white or black.

Q: Should I fully insert RCA connectors when connecting them to the amplifier?

A: Yes, make sure the RCA connectors are fully inserted. SLASH’s connectors are precisely made, so they may feel tight at first. A loose connection can result in low sound, so double-check if the volume is too low.

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

A: SLASH supports 1:1 Bluetooth pairing. If it's already connected to another device, reset the connection by pressing the MFB button on the back of SLASH. This will allow you to reconnect your device.

Q: How can I get the best sound quality with SLASH?

A: After pairing via Bluetooth, set your device's volume to maximum. Then, adjust the amplifier’s volume to your preferred level.

Q: Can SLASH3 be used as a standalone DAC?

A: SLASH3 functions only as a Bluetooth DAC and cannot be used as a standalone DAC. If you need both Bluetooth and USB DAC capabilities, consider upgrading to the SLASH6 model.

Q: The sound distorts when my phone's volume is at maximum. How can I fix it?

A: SLASH is designed to prevent distortion, even at higher volumes. If you do experience distortion, it may be due to a low input level on your amplifier. Try lowering your phone’s volume to around 80% to resolve the issue.

Q: Do I need to charge SLASH?

A: No charging is needed. Keep SLASH connected to a power source as it uses minimal current, ensuring stable performance.

Q: What type of DC adapter should I use with SLASH?

A: SLASH is compatible with most adapters, but for the best performance, we recommend using a 5V 1A adapter (such as a smartphone charger).

Q: Can I connect SLASH to a vacuum tube amplifier, preamp, or vintage amplifier?

A: Yes, SLASH can connect to any amp. It works perfectly with tube amps, preamps, and vintage analog amps through the RCA input. For amps with wider RCA spacing, use the included adapter.

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 for convenience.

Q: Can I play music directly from USB on SLASH?

A: No, SLASH does not have a built-in playback function. To enjoy high-quality sound, connect the USB to a playback-capable device, such as a laptop or PC, and use the SLASH6 as a USB DAC without any additional setup. (Ensure that the amplifier is connected to the SLASH6.) Connect the included high-quality USB-C cable, which supports both power and data transfer, to the SLASH6's power port.

Q: Can it connect to devices without Bluetooth?

A: Yes, it can! You can connect it to an amplifier without Bluetooth or use it to upgrade the sound quality of an existing Bluetooth connection. Just connect, and enjoy high-quality sound right away.

Q: Does it maintain a stable connection when the device is out of sight?

A: If placed in an enclosed space, the Bluetooth connection may become unstable. For the best high-quality playback without interruptions, it’s recommended to use it in an open space where wireless interference is minimized.

Slash4 Product FAQs

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

A. First, check if the USB power source is functioning properly. If you're using a car cigarette lighter adapter, try switching to a different USB power source, as the adapter itself could be the issue.

Q. The LED power light is on, and the AUX cable is connected, but there’s no sound. What should I do?

A. Make sure the AUX cable is fully inserted into the Slash4. You should hear a "click" sound when the cable is properly connected. If it's not fully inserted, the LED may light up, but no sound will play.

Q. How do I use the reset button?

A. While the power is on, press the reset button once briefly. Avoid holding it down for too long.

Q. Are there any compatibility issues with car models?

A. SLASH4 is compatible with any car that has a working AUX port, offering noticeably improved Bluetooth sound quality. Please note that SLASH4 may not work with Android Auto or Apple CarPlay. For the best audio experience, we recommend using SLASH4 as a standalone device.

Q. Is setup complicated or straightforward?

A. Setup is very straightforward. Simply connect the included 3.5mm cable to your car’s AUX port and to the SLASH4, connect the USB for power, and pair SLASH4 with Bluetooth on your phone. You’re ready to play music!

Q. How do I connect Slash4 to an amplifier?

A. Use the included optical cable. First, connect Slash4 to a USB power source, such as a power adapter, portable battery, PC, or laptop. Then, connect one end of the optical cable to the 3.5mm optical output on Slash4, and the other end to the optical input on your amplifier. On your amplifier, select the optical input, pair Slash4 with your Bluetooth device, and start playing music. If your Bluetooth device was previously paired with Slash4, it will automatically reconnect.

Q. Which provides better sound quality, AUX connection or optical input to DSP?

A. Slash's DAC likely offers superior sound quality compared to DSP DACs, as the hardware design is more advanced.

Q. When playing music from a smartphone app (YouTube, streaming apps), does the track info display on the car’s monitor?

A. Slash4 will support this feature in a future firmware update.

Q. How do I set the codec when pairing with an iPhone or iPad?

A. iPhones and iPads only support the AAC codec, so it will automatically select AAC during pairing.

Q.Does its audio output get distorted at higher volumes?

A. With SLASH4, audio distortion does not occur even at higher volumes. If you do experience distortion, it may be due to a low input level on your car’s amplifier. Adjusting your phone’s volume to around 80% should resolve the issue.

Slash-T Product FAQs

Q. Can it connect to multiple devices simultaneously?

A. SLASH-T does not support simultaneous connections to multiple devices.

Q: Do I need to reconnect the device every time I use it?

A: No, SLASH-T automatically reconnects to the last paired receiver, so there is no need to manually reconnect each time

Q: If I use headphones as the receiver, do I need to reconnect when switching from my phone to my laptop?

A: No, if your headphones are already paired with SLASH-T, they will automatically connect to your phone, laptop, PC, desktop, or other devices without needing to reconnect.

Q: How do I set up the connection?

A: The setup process for transmitters is slightly different from receivers. We recommend watching our instructional videos, which cover each step in detail. These videos will make the setup process easy to follow.

Q. Is setup complicated or easy with provided instructions?

A. Installation is simple and intuitive. For the best experience, please refer to the manual and instructional videos. If you’re new to the device, it may feel a bit unfamiliar at first. Assistance is available in the manual if needed.

Q: Will there be latency when connecting SLASH-T to a receiver that supports aptX Adaptive?

A: SLASH-T prioritizes high audio quality and will automatically connect via aptX Adaptive. In Bluetooth headsets that support both aptX Adaptive and aptX Low Latency, you may experience slight latency with aptX Adaptive due to the higher data transmission required for superior sound quality. If you prefer low latency, we recommend using SBC or aptX codecs.

Q: When does aptX Low Latency work?

A: aptX Low Latency only works when both the transmitter and the receiver support this feature. If only one device supports it, aptX Low Latency will not be activated. Please ensure that both your transmitter and receiver are compatible with aptX Low Latency for optimal performance.

Q. Are there any compatibility issues with specific TV models reported?

A. SLASH-T is compatible with any TV that has an optical output. Simply connect the TV’s optical output to the SLASH-T’s 3.5mm optical input, connect the USB for power, and pair with your headphones.