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Audio Bolt DAC/AMP, USB-C Portable High-End DAC/Headphone Amplifier with MQA Playback. Mobile Studio Sound for Android, iOS and PC. USB-C to 3.5mm Audio, THX Certified

4.0 4.0 out of 5 stars 401 ratings

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Purchase options and add-ons

Brand HELM
Interface Type USB
Product Dimensions 4"L x 0.25"W
Material Aluminum

About this item

  • STUDIO GRADE PORTABLE DIGITAL ANALOG CONVERTOR WITH MQA: BOLT delivers studio sound on the go from any mobile device across all listening formats. Supports MQA (Master Quality Authenticated) streaming for unparalleled fidelity in portable audio. Compatible with Android, iOS, Mac, and PC’s. May require extra adapters or third party apps for MQA support.
  • HIGHEST FIDELITY SOUND: MQA (Master Quality Authenticated) rendering “unfolds” every detail of the original master recording as the artist and engineers intended it to be heard for better-than-CD audio resolutions. Stream MQA content from TIDAL, nugs.net, and Xiami. MQA Certified.
  • SMARTPHONE, TABLET, MAC & PC COMPATIBLE: USB-C input to a 3.5mm Headphone Output supporting playback of PCM files with sampling rates up to 384 kHz, or DSD files with sampling frequencies up to 5.6MHz. The 3.5mm audio jack seamlessly connects to your wired headphones or speaker system. Note: An adapter is required if you do not have a 3.5mm input jack.
  • AMPLIFIED AUDIO OUTPUT & HEADPHONE OUTPUT LEVEL MATCHING: Provides an average increase of +6 dB in devices with combined USB-audio output (where a dedicated headphone audio output isn’t available). Headphone output level automatically detects headphone impedance and sets level accordingly (1V for 150 ohms).
  • THX CERTIFIED AUDIO OUTPUT: Exclusively designed for ultra-low harmonic, crosstalk & crossover distortion. Unlike other mobile MQA-DAC designs, the HELM BOLT physically isolates the DAC from the USB connector for improved EMI isolation, and uses a three oscillator design for superior frequency lock with dramatic improvements over single oscillator DAC designs.
  • Android 12 Devices: Some Android 12 devices may experience low volume levels using the BOLT. The fix is to upgrade to new firmware found on the HELM Audio Support Page
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HELM Audio Bolt DAC/AMP, USB-C Portable High-End DAC/Headphone Amplifier with MQA Playback. Mobile Studio Sound for Android, iOS and PC. USB-C to 3.5mm Audio, THX Certified

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Product details

  • Product Dimensions ‏ : ‎ 4 x 0.25 x 0.25 inches; 1 ounces
  • Item model number ‏ : ‎ HMQA-100B
  • Department ‏ : ‎ womens
  • Date First Available ‏ : ‎ June 24, 2020
  • Manufacturer ‏ : ‎ HELM
  • ASIN ‏ : ‎ B086GK94X2
  • Customer Reviews:
    4.0 4.0 out of 5 stars 401 ratings

Product Description

HELM bolt dac amp mobile mqa certified usb digital analog converter studio quality usb android ios
HELM BOLT DAC/AMP

MOBILE MQA-CERTIFIED USB DIGITAL ANALOG CONVERTER

The High Definition Digital Analog Converter with MQA rendering technology to bring studio quality audio to your phone. Plug & Play on Your Favorite Mobile Device for Incredible Studio Quality Audio. Stream MQA content from Tidal, Nugs and Xiami.

HELM bolt dac amp mobile mqa certified usb digital analog converter studio quality usb android ios

INCREDIBLE SOUND

The HELM BOLT is a High-End Digital Analog Converter for your high-res FLAC or WAV files, and it will improve audio quality while streaming Apple Music, Spotify, Amazon, and others. Enjoy playback of PCM files with sampling rates up to 384 kHz, or DSD files with sampling frequencies up to 5.6MHz.

HELM bolt dac amp mobile mqa certified usb digital analog converter studio quality usb android ios

MASTER QUALITY AUTHENTICATED

Master Quality Authenticated (MQA) is an award-winning technology that unlocks every detail of the original master recording with the convenience of streaming audio. MP3s deliver 10% of the original recording quality, but the HELM BOLT can stream MQA music at over 8 times the sampling rate of CD.

HELM bolt dac amp mobile mqa certified usb digital analog converter studio quality usb android ios

What's in the box

  • Cable
  • Looking for specific info?

    Customer reviews

    4 out of 5 stars
    4 out of 5
    401 global ratings

    Customers say

    Customers like the sound quality and descriptiveness of the electronic signal converter. For example, they mention it provides extra clarity, has a deep bass, and high resolution mobile sound. That said, opinions are mixed on performance, value, and quality.

    AI-generated from the text of customer reviews

    58 customers mention42 positive16 negative

    Customers like the sound quality of the electronic signal converter. Some say that the sound is passable, but not great. They say that it provides cleaner and more detailed sound than Dragonfly Black. They also say that high resolution mobile sound from your phone, tablet or PC is much deeper than what comes directly from the computer or iPad. Some mention that the bit rates work great and the headphones are very loud. Overall, most are satisfied with the sound performance and recommend the product to others.

    "...from Helm and a great pair of headphones provide the best possible listening experience." Read more

    ".../IEM's but for me using the 1More Quad Driver IEMs the separation and sound stage is nice, it's more intimate than spacious but the details are easy..." Read more

    "...The bass is much deeper than what comes directly from the computer or iPad and it is clear. No mud here...." Read more

    "...It is somewhere around the Oppo and has a very analytical, ESS typical sound, far and away better than the Razer or other things while not as clean..." Read more

    11 customers mention11 positive0 negative

    Customers find the sound of the electronic signal converter pretty hi-end hifi clarity. They say it adequately represents the detail, imaging, and holographic qualities. Customers also say the midrange is full, deep, and detailed, and the highs sound right. They also mention that the details are easy to hear and the spectrum follows suit. Overall, customers are satisfied with the descriptiveness of the product.

    "...sound stage is nice, it's more intimate than spacious but the details are easy to hear, the only con to these is the volume is slightly lower with..." Read more

    "...much deeper than what comes directly from the computer or iPad and it is clear. No mud here...." Read more

    "...SE 535's on my Asus: deeper bass, better instrument separation, a bit clearer and a wider soundstage...." Read more

    "...It is somewhere around the Oppo and has a very analytical, ESS typical sound, far and away better than the Razer or other things while not as clean..." Read more

    6 customers mention6 positive0 negative

    Customers appreciate the size of the electronic signal converter. They mention that it is very small, has an amazingly small foot print, and is a great DAC.

    "...little beast is simply perfect of you use Tidal Master on Android 11: small, with nice power and a great sound upgrade...." Read more

    "...It’s small, very small.That’s the only plus." Read more

    "...The BOLT is small, light, and sounds great!!" Read more

    "...Nice full sound. It's so small I can pack it in my IEM headphone case. Nice match with Moondrop Aria or Kato." Read more

    4 customers mention4 positive0 negative

    Customers find the electronic signal converter easy to use. They mention it's easy to install and plug-and-play.

    "...This product surpasses them all by a long stretch. It could not be easier to use - simply plug into a USB C port, plug in your headphones, and you..." Read more

    "It's plug-and-play. It does MQA, I'm not really a fan but if you're listening to Tidal Master files it's better to have it than not...." Read more

    "Music sounds much better, thanks to this device. Easy to install." Read more

    "Easy to use and fantastic sound with Tidal HiFi MQA !..." Read more

    26 customers mention9 positive17 negative

    Customers are mixed about the performance of the electronic signal converter. Some mention that it works like a charm, works well on an Apple device, and does great with Tidal, while others say that it rarely works, stopped working after literally 30 minutes of use, and is useless on Android.

    "...Couldn't get it to work after that, returned and ordered a replacement...." Read more

    "...Of course it does work great with Tidal so long as you also install UAPP (full functionality for UAPP with MQA cost about $10) though I have a lot..." Read more

    "...If you use Tidal with Android 12, it is useless. Not working anymore, Tidal just don't send the signal, or Bolt doesn't get it...both the company..." Read more

    "Sound quality was good. However stopped working after 5 months with very little use.Update:..." Read more

    23 customers mention15 positive8 negative

    Customers are mixed about the value of the electronic signal converter. Some mention it's worth every penny, an excellent sounding DAC for the price, and an amazing portable DAC. However, others say that it'll not be worth it, is useless, and disappointing.

    "...These items from Helm and a great pair of headphones provide the best possible listening experience." Read more

    "Very disappointing. Sounded great when it worked...." Read more

    "...Value for the money is unbeatable!If you use Tidal with Android 12, it is useless...." Read more

    "...For a Very Reasonable $100 Price Tab The HELM Bolt D.A.C./Amp Is Well Worth It and Recommended." Read more

    18 customers mention7 positive11 negative

    Customers are mixed about the quality of the electronic signal converter. Some mention it's a solid little DAC that runs hot, is durable, and is future-proof. However, others say that it seems defective, fraying after 3 months, and completely falling apart.

    "...They're not great and only last two weeks to two months but most of them get the job done.4...." Read more

    "It’s a great portable DAC that doesn’t require constant adjustments to get the great sound that DACs provide...." Read more

    "...The This thing is CRAP. DO NOT WASTE YOUR MONEY. YOUR PHONE WILL SOUND LIKE CRAP WITH THIS BOLT. Don't waste your money...." Read more

    "...when I got it but unfortunately after 3 months the cable is starting to fray...." Read more

    Helm Audio for Android S22 Ultra
    5 Stars
    Helm Audio for Android S22 Ultra
    If you want to use the Helm Audio Bolt on an android phone and you find out that it doesn't work, then use it with the Audioquest Dragontail adapter. $29 on Amazon. The Dragontail has a chip built in that will activate Android audio to make it work. I already had the Dragontail when I was using the Audioquest Red Dragonfly dac. But, the 3.5 connection went bad. The Bolt and Dragontail combo works great! I use it at work to demo high end home audio for a well known retail store. I am buying another Bolt and Dragontail for my car stereo for permanent installation.
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    Edwin the Elder
    5.0 out of 5 stars Works great with my iPad Pro Edit
    Reviewed in Canada on July 7, 2022
    Skyweaver
    5.0 out of 5 stars Small is beautiful.
    Reviewed in the United Kingdom on June 2, 2022
    2 people found this helpful
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    いぱん
    5.0 out of 5 stars 自然な音
    Reviewed in Japan on November 19, 2022
    8 people found this helpful
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    lilia c.
    5.0 out of 5 stars Clear and clean sound
    Reviewed in Canada on January 18, 2024
    Clive Orchard
    5.0 out of 5 stars This unit is really simple to use and very transportable
    Reviewed in the United Kingdom on August 1, 2022
    One person found this helpful
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