INFO: 10% Discount on JustBoom products - Affordable High Quality Audio

Hey Roon users,

We’re launching a new range of audio products today called JustBoom. They are high-quality audio boards designed for the Raspberry Pi A+, B+, 2B, 3B and Pi Zero, plus two standalone DAC and Amp boards.

As we know Roon users like using the Raspberry Pi to stream music, we want to offer each and every one of you a 10% on a purchase of JustBoom products.

All you have to do is enter this discount code at checkout and it’ll remove 10% from your JustBoom order

Discount Code: ROONJUSTBOOM
Visit pi-supply.com to redeem this voucher

This is our full product range and below you can see a few pictures of the boards.

Product Range:
JustBoom Standalone Amp
JustBoom Standalone DAC
JustBoom DAC HAT
JustBoom Amp HAT
JustBoom Digi HAT
JustBoom Amp Zero
JustBoom DAC Zero
JustBoom Digi Zero

If you decide to purchase, we’d love your feedback on our products if possible. Plus, if you have a question, please ask away! :slight_smile:

We also have some sleek black cases to enclose whichever JustBoom board you decide to go with. View all JustBoom Boards, Cases and Remotes here.

Also, incase any of you are based in New York, we’re at Maker Faire New York on October 1st & 2nd - so come by, say hello, and test out our audio boards at our stand if you’d like! :slight_smile:

More detailed descriptions of each product can be found below.

[details=Digi HAT]

Product Description

We’ve designed the JustBoom Raspberry Pi Digi HAT to be simple to install and use. With no soldering required and all the mounting hardware already provided this product is suitable for absolute beginners and seasoned professionals alike. Just connect your Digi HAT to external DAC or amplifier/amplified speakers and you can be up and running quickly, enjoying flawless high quality audio playback within minutes of setting up this Raspberry Pi HAT. We also include an optional IR receiver to allow remote control operation of your Raspberry Pi.

The JustBoom Digi HAT Includes a 192kHz/24 bit digital audio chip with low jitter, bit perfect digital output (S/PDIF) over optical or coaxial connectors for an uncompromised high quality audio experience. The JustBoom Digi HAT includes an output transformer for full galvanic isolation between your Raspberry Pi and your DAC on the coaxial output.

The Raspberry Pi Digi HAT uses the I2S interface for its audio input which reduces CPU load on the Raspberry Pi compared to USB solutions. It is also powered directly from the GPIO header so no extra cables or power supplies are required to connect to the Raspberry Pi. All of the Raspberry Pi GPIO pins are still accessible on the Digi HAT for easy customisation of your project. Add additional sensors, buttons, LEDs, rotary encoders or anything your heart desires.

Use cases

Pairing the Raspberry Pi with a high quality digital audio add on board provides the perfect solution for a number of exciting projects and applications where the standard on-board audio on the Raspberry Pi simply won’t cut it. Here are some possible use cases for the JustBoom Raspberry Pi Digi HAT and your Raspberry Pi computer:

  • Circumstances where you need to have your streaming audio player (Raspberry Pi in this case) located separately from your amplifier or DAC. This method is usually superior to analog since the original digital signal is maintained until the amplification step (theoretically leading to less degradation of the sound).
  • Streaming (either from cloud or local network) high-definition audio player
  • Multi-room audio player
  • Surround sound for media centre / set top box applications
  • And many many more….

Features

  • Dedicated S/PDIF output interface chip supports up to 192kHz / 24bit resolution
  • Digital audio output over either optical (TOSLINK) or coaxial (RCA electrical) connectors
  • Low jitter, bit perfect digital output
  • Output transformer for galvanic isolation
  • Plug and play compatibility for ease of use
  • Software volume control from your Raspberry Pi
  • No soldering required
  • Powered by the Raspberry Pi GPIO header
  • Compatible with Raspberry Pi A+,B+, 2B and the new 3B (and also compatible with the Raspberry Pi Zero, but we would recommend the JustBoom Digi Zero for this purpose)
  • Mounting hardware included
  • Optional IR receiver included in package
  • All Raspberry Pi GPIO pins still accessible via 40pin unpopulated extension header
  • The JustBoom Raspberry Pi Digi is fully HAT compliant
  • Full driver support in Raspbian / NOOBS

Technical Information

  • WM8804GEDS S/PDIF Transceiver with 24bit/192khz and has an integrated low jitter PLL (50ps RMS)
  • DA101JC high bandwidth digital output transformer for galvanic isolation on electrical (coaxial/RCA) output
  • Integrated EEPROM for automatic Raspberry Pi devicetree driver configuration and fully HAT compatible
  • Digital signal output over S/PDIF with either optical (TOSLINK) or coaxial (RCA) connectors
    We recommend that if you are using the coaxial/RCA output that you connect the cable shield to the ground on the DAC / amplifier you are using and make sure that the the DAC / Amplifier is using a power supply with the ground pin connected. This will help to reduce noise
  • Bit perfect digital audio transmission
  • Optional Vishay TSOP4838 IR receiver included in package (solder yourself if required)
  • While the hardware is able to output DTS/Dolby Digital, the Raspberry Pi software is not currently able to support this. Let us know if you want to implement this and we will do our best to help[/details]

[details=DAC HAT]

Product Description

We’ve designed the JustBoom DAC HAT to be simple to install and use. With no soldering required and all the mounting hardware already provided this product is suitable for absolute beginners and seasoned professionals alike. Just connect your DAC HAT to a set of powered speakers or an audio amplifier and you can be up and running quickly, enjoying flawless high quality audio playback within minutes of unboxing this Raspberry Pi HAT. We also include an optional IR receiver to allow remote control operation of your Raspberry Pi.

Includes a 384kHz/32 bit DAC chip with hardware volume mixing as well as a 138mW headphone amplifier (note that the Raspberry Pi is only capable of a 192kHz/32bit output). Outputs are line level over RCA and headphone amplified over 3.5mm jack cable. The HAT uses the I2S interface for its audio input which reduces CPU load on the Raspberry Pi compared to USB solutions. It is also powered directly from the GPIO header so no extra cables or power supplies are required to connect to the Raspberry Pi. All of the Raspberry Pi GPIO pins are still accessible on the DAC HAT for easy customisation of your project – add additional sensors, buttons, LEDs, rotary encoders or anything your heart desires.

Use cases

Pairing the Raspberry Pi with a high quality audio card provides the perfect solution for a number of exciting projects and applications where the standard on-board audio on the Raspberry Pi simply won’t cut it. Here are some possible use cases for the JustBoom DAC HAT and your Raspberry Pi computer:

  • Streaming (either from cloud or network storage) high-definition audio player
  • Multi-room audio player
  • Media centre / set-top box living room entertainment system
  • Shop floor / elevator / background music audio player
  • High quality audio player with local storage
  • Desktop high definition audio player with amplified headphone output
  • And many many more….

Features

  • Full high quality audio – 384kHz / 32bit
  • Includes both a DAC and headphone amplifier
  • Line-level RCA and headphone amplified 3.5mm jack outputs
  • Plug and play compatibility for ease of use
  • Hardware and software volume control from your Raspberry Pi
  • No soldering required
  • Powered by the Raspberry Pi GPIO header
  • Compatible with Raspberry Pi A+,B+, 2B and the new 3B (and also compatible with the Raspberry Pi Zero, but we would recommend the JustBoom DAC Zero for this purpose)
  • Mounting hardware included
  • Optional IR receiver included in package
  • Compatible with the JustBoom Amp which can easily stack on top of the DAC HAT to add amplification and extra outputs!
  • All Raspberry Pi GPIO pins still accessible via 40pin unpopulated extension header
  • Fully HAT compliant
  • Full driver support in Raspbian

Technical Information

  • Burr-Brown / Texas Instruments PCM5122 DAC chip – 384kHz / 32 bit. Please note that due to Linux driver restrictions, max frequency is limited to 192kHz on the Raspberry Pi
    Texas Instruments TPA6133A2 headphone amplifier – 138mW
  • Fully integrated hardware volume mixing via “alsamixer” or any ALSA compatible application
    Integrated EEPROM for automatic Raspberry Pi devicetree driver configuration and fully HAT compatible
  • Optional Vishay TSOP4838 IR receiver included in package (solder yourself if required)
    112dB signal to noise ratio (SNR) and -93dB total harmonic distortion (THD +N at -1dB) for best-in-class audio
  • Advanced ESD protection on both headphone and RCA outputs
  • Ultra low noise voltage regulator for the best audio output (LDO 10uVrms)[/details]
DAC

Product Description

Connect your JustBoom DAC to a set of powered speakers, headphones or an audio amplifier and you can be up and running quickly, enjoying flawless, crystal-clear high quality audio playback within minutes of unboxing. If you need amplification or additional outputs for passive speakers, the JustBoom DAC is also compatible with the JustBoom Amp – just stack the Amp on top with the mounting hardware and board to board connector and you will be good to go.

This affordable, standalone DAC has among the best value for money available on the market and truly reduces the barriers to entry for versatile high quality audio playback. The digital (S/PDIF) inputs include both optical (TOSLINK) and coaxial/RCA connector options. The onboard DAC chip offers a 384kHz/32 bit output (although this is limited due to the input S/PDIF receiver to 108kHz/24bit). The JustBoom DAC additionally includes a 138mW headphone amplifier.

The board outputs line level audio over RCA and also offers a headphone amplified output over 3.5mm jack cable. The board is powered by a standard 5 volt microUSB power supply – this is a common power supply in tablets and smartphones so many of you will already have one available or can pick one up for a good price!

Use cases

A standalone audio DAC card provides the perfect solution for a number of exciting projects and applications where standard audio resolutions just won’t cut it. Here are some possible use cases for the JustBoom DAC:

  • Paired with the JustBoom Digi HAT / JustBoom Digi Zero as a receiver for your digital audio output
  • Paired with the JustBoom Amp to offer all in one DAC and amplifier for a compact high-quality audio solution
  • High quality headphone amplifier for your digital audio receiver
  • Streaming (either from cloud or network storage) high-definition audio player
  • Multi-room audio player
  • Media centre / set-top box living room entertainment system
  • And many many more….

Features

  • Full high quality audio – 108kHz / 24bit (uses 384kHz/32bit DAC chip but this is limited due to the S/PDIF input)
  • Includes S/PDIF input using either optical (TOSLINK) or electrical (RCA/coaxial) connections
  • Includes both a DAC and headphone amplifier
  • Line-level RCA and headphone amplified 3.5mm jack outputs
  • Plug and play compatibility for ease of use
  • No soldering required
  • Powered by the 5v microUSB power supply – you probably already have one!
  • Compatible with the JustBoom Amp
  • Mounting hardware included

Technical Information

  • Burr-Brown / Texas Instruments PCM5102A DAC chip – 384kHz / 32 bit. Please note that due to restrictions of the S/PDIF receiver the max quality is limited to 108kHz / 24 bit
  • Texas Instruments TPA6133A2 headphone amplifier – 138mW
  • 112db SNR and -93db THD for best-in-class audio
  • Advanced ESD protection on both headphone and RCA outputs
  • Ultra low noise voltage regulator for the best audio output (LDO 10uVrms)
  • 5v microUSB power input requires at least 100mA when using RCA connectors or at least 200mA when using headphone connector. We recommend at least a 500mA power supply
  • Stacking with JustBoom Amp by way of board-to-board connector. All of the required mounting hardware in order to do this is included with the two products for ease
Amp

Product Description

The JustBoom Amp provides a 2x55W (peak) amplified stereo output. Just connect your JustBoom Amp to a set of passive speakers and you can be up and running quickly. Enjoy flawless high quality audio playback within minutes of unboxing. Includes an advanced Class-D power amplifier chip for a peak power output of 2 x 55 Watts. The JustBoom Amp outputs audio over two speaker cable connector blocks that accept anything up to 14 AWG cable and will provide crystal clear audio to either 4 or 8 Ohm passive speakers.

JustBoom Amp can either be used as a standalone amplifier, or it can be stacked on the JustBoom DAC HAT or DAC boards to make a fully integrated DAC/Amp combo by means of a board to board connector and mounting hardware. Give your audio an extra kick, and extra output options for a more versatile and affordable high-quality audio experience!

The JustBoom Amp is designed with a 2.1mm DC jack power input which can accept an 8 to 24 Volt power supply. When stacked on the JustBoom DAC it can backpower the DAC board. Plus, when stacked on the JustBoom DAC HAT it can backpower both the DAC HAT and the Raspberry Pi too (at the 2.5A for full Pi3 compatibility). This means you only need a single power supply for the entire system…saving you time and money.

Use cases for the AMP

A standalone audio power amplifier card provides the perfect solution for a number of exciting projects and applications where standard audio resolutions just won’t cut it, or where you want to give an extra kick to your JustBoom DAC / DAC HAT boards. Here are some possible use cases for the JustBoom Amp:

  • Compact standalone amplifier to pair with your existing DAC
  • Paired with the JustBoom DAC / DAC HAT to offer all in one DAC and amplifier for a compact high-quality audio solution
  • Streaming (either from cloud or network storage) high-definition audio player
  • Multi-room audio player
  • Media centre / set-top box living room entertainment system
  • And many many more….

Features

  • Full high quality audio – 192kHz / 24bit
  • Stereo amplified 2 x 55 Watt peak output at 8 ohms (2 x 30 Watt RMS)
  • Plug and play compatibility for ease of use – just connect to your passive speakers
  • Onboard, hardware jumpers for configuring output voltage and gain settings (jumpers could optionally be changed with switches)
  • No soldering required
  • Compatible with the JustBoom DAC and DAC HAT or alternatively use as a standalone device
  • When stacked on the JustBoom DAC it can backpower the DAC board, and when stacked on the JustBoom DAC HAT it can backpower both the DAC HAT and the Raspberry Pi too (at the 2.5A for full Pi3 compatibility)
  • Mounting hardware included

Technical Information

  • Texas Instruments TPA3118D2DAP Class-D amplifier chip with maximum power output of 2 x 55 W ( 2 x 30 W RMS)
  • On the JustBoom Amp there are five line input connections. For balanced inputs: L+ is hot line L- cold line for left channel; R+ hot line, R- cold line for right channel; middle is ground (or cable shield) connection. For unbalanced L+ is left line, R+ right line, L-, R- and gnd are ground connections and all three inputs should be shorted to same input ground.
  • Dual inductors on board for footprint efficiency
  • The JustBoom Amp is designed with a 2.1mm DC jack power input which can accept an 8 to 24 Volt power supply. For 8 Ohm speakers, we recommend a 24 volt power supply with at least 75 Watt output power (POWERPAX SW4527 or similar plus C5 cable). For 4 Ohm speakers we recommend a 15 to 19 volt power supply with at least 58 Watt output power (POWERPAX SW4520 or similar). These power supply guidelines will ensure maximum output performance of the amplifier. However there are other options which can be found in our power supply recommendation document. (Please note: it is highly recommended to use an external power supply. If you power the JustBoom Amp from the DAC 5v PSU or over the GPIO pins of the Raspberry Pi and do not use one of the recommended power supplies, the maximum output power will be 2 x 3 Watts)
  • When stacked on the JustBoom DAC this board can backpower the DAC board, and when stacked on the JustBoom DAC HAT it can backpower both the DAC HAT and the Raspberry Pi too (at the 2.5A for full Pi3 compatibility) meaning you only need a single power supply for the entire system
  • Advanced ESD protection
  • Total harmonic distortion (THD+N) of 0.1 % at 25 W, 1 kHz, 21V. Signal to noise ratio (SNR) of 102 dB A-Wtd (Ref. to THD+N < 1%, f = 1 kHz, Gain = 20 dB)
  • Fully configurable onboard jumpers to adjust gain (20dB, 26dB, 32dB, 36dB) and output voltage (14V and 21V)
  • View Technical Document

[details=Amp HAT]

Product Description
We’ve designed the JustBoom Amp HAT to be simple to install and use. With no soldering required and all the mounting hardware already provided this product is suitable for absolute beginners and seasoned professionals alike. Just connect your Amp HAT to a set of passive speakers and you can be up and running quickly, enjoying flawless high quality audio playback within minutes of setting up this Raspberry Pi HAT. We also include an optional IR receiver to allow remote control operation of your Raspberry Pi.

Includes a Class-D power amplifier chip with built in 192kHz/32bit DAC, for a peak power output of 2 x 55 Watts. The JustBoom Amp HAT outputs audio over two speaker cable connector blocks that accept anything up to 14 AWG cable and will provide crystal clear audio to either 4 or 8 Ohm passive speakers. The Amp HAT uses the I2S interface for its audio input which reduces CPU load on the Raspberry Pi compared to USB solutions. It is also designed to back-power the Raspberry Pi over the 40 pin GPIO header, meaning you only need a single power supply for the entire system.

Last but not least, all of the unused Raspberry Pi GPIO pins are still accessible on the Amp HAT for easy customisation of your project – add additional sensors, buttons, LEDs, rotary encoders or anything your heart desires.

Use cases

Pairing the Raspberry Pi with a high quality audio power amplifier provides the perfect solution for a number of exciting projects and applications where the standard on-board audio on the Raspberry Pi simply won’t cut it. Here are some possible use cases for the JustBoom Amp HAT and your Raspberry Pi computer:

  • Multi-room streaming/local audio player
  • Interactive art projects with audio requirement
  • Arcade table projects with high quality, immersive audio
  • Streaming (either from cloud or network storage) high-definition audio player
  • Internet radio player with high quality stereo audio
  • Refit old radios and boomboxes (Roberts radios etc) with high quality streaming audio
  • And many many more….

Features

  • Full high quality audio – 192kHz / 32bit
  • 2 x 55 Watt peak output at 8 ohms (2 x 30 Watt RMS)
  • Includes both a DAC and power amplifier – just connect to your passive speakers
  • Back-powers the Raspberry Pi over the GPIO (with full HAT compliant protection) at 2.5A so only one power supply required for the whole system.
  • Plug and play compatibility for ease of use
  • Hardware and software volume control from your Raspberry Pi
  • Onboard, hardware jumpers for configuring mute and gain settings (jumpers could optionally be changed with switches)
  • Mute/enable with GPIO22 (this can be overridden by using jumper J4)
  • No soldering required
  • Compatible with Raspberry Pi A+,B+, 2B and the new 3B (and also compatible with the Raspberry Pi Zero, but we would recommend the JustBoom Amp Zero for this purpose)
  • Mounting hardware included
  • Optional IR receiver included in package
  • Unused GPIO pins still accessible via unpopulated extension header
  • Fully HAT compliant
  • Full driver support in Raspbian / NOOBS
  • Compatible with Roon Labs

Technical Information

  • Texas Instruments TAS5756M Amp / DAC chip – 192kHz / 32 bit.
  • Maximum power output of 2 x 55 W ( 2 x 30 W RMS).
  • This board powers both the amplifier and Raspberry Pi from a single 2.1mm DC jack power supply. For 8 Ohm speakers, we recommend a 24 volt power supply with at least 75 Watt output power (POWERPAX SW4527 or similar plus C5 cable). For 4 Ohm speakers we recommend a 15 to 19 volt power supply with at least 58 Watt output power (POWERPAX SW4520 or similar). These power supply guidelines will ensure maximum output performance of the amplifier. However there are other options which can be found in our power supply recommendation document. (Please note: it is highly recommended to use an external power supply. If you power the Amp HAT over the GPIO pins and do not use one of the recommended power supplies, the maximum output power will be 2 x 3 Watts)
  • Advanced ESD protection
  • Dual inductors on board for footprint efficiency
  • Fully integrated hardware volume mixing via “alsamixer” or any ALSA compatible application
    Integrated EEPROM for automatic Raspberry Pi devicetree driver configuration and fully HAT compatible
  • Optional Vishay TSOP4838 IR receiver included in package (solder yourself if required)
  • Total harmonic distortion (THD+N) of 0.006 % at 1 W, 1 kHz. Signal to noise ratio (SNR) of 104 dB A-Wtd (Ref. to THD+N = 1%)
  • Ultra low noise voltage regulator for the best audio output (LDO 10uVrms)
  • Fully digital sound path for optimal audio performance
  • Mute/enable via GPIO22 and also there is jumper J4 for enable, that overrides software enable
  • View Technical Document[/details]
Amp Zero

Product Description

The JustBoom Pi Zero AMP pHAT is a high quality amplifier designed specifically for the Raspberry Pi Zero. Simply stack the HAT onto your Pi Zero and then connect your speakers.

With no soldering required and all the mounting hardware already provided, the Pi Zero pHat is a true plug and play device. Enjoy flawless high quality audio playback within minutes of setting it up.

Use cases

  • Pi Zero Gameboy

Features

  • Full high quality audio – 384kHz / 32bit
  • Advanced ESD protection
  • Plug and play compatibility for ease of use
  • Hardware volume control from your Raspberry Pi
  • No soldering required
  • Powered by the Raspberry Pi GPIO header
  • Compatible with Raspberry Pi Zero
  • Mounting hardware included
  • Optional IR receiver included in package
  • Fully HAT compliant
  • Full driver support in Raspbian / NOOBS

Technical Information

  • TAS5756 Digital Audio AMP – Class D
  • Texas Instruments TPA6133A2 headphone amplifier – 138mW
  • Maximum output is 30 W (RMS) 55W (Peak)
  • Fully integrated hardware volume mixing via “alsamixer” or any ALSA compatible application
  • Optional Vishay TSOP4838 IR receiver included in package (solder yourself if required)
  • 112db SNR and -93db THD for best-in-class audio
  • Advanced ESD protection on both headphone and RCA outputs
  • View Technical Document
DAC Zero

Product Description

The JustBoom DAC pHAT is a plug and play, high resolution, digital-to-analog converter for the Raspberry Pi Zero.

We’ve designed the JustBoom Pi Zero DAC pHAT to be simple to install and use. With no soldering required and all the mounting hardware already provided you can be up and running and enjoying flawless high quality audio playback within minutes. this product is suitable for absolute beginners and seasoned professionals alike. Just connect your DAC HAT to a set of powered speakers or an audio amplifier and you can be up and running quickly, enjoying flawless high quality audio playback within minutes of setting up this Raspberry Pi HAT. We also include an optional IR receiver to allow remote control operation of your Raspberry Pi.

Includes a 384kHz/32 bit DAC chip with hardware volume mixing as well as a 138mW headphone amplifier. Outputs are line level over RCA and headphone amplified over 3.5mm jack cable. The HAT uses the I2S interface for its audio input which reduces CPU load on the Pi Zero compared to USB solutions. It is also powered directly from the GPIO header so no extra cables or power supplies are required to connect to the Raspberry Pi.

Use cases

  • Battery powered portable high definition audio player

Features

  • 32 bit high quality audio at 384kHz
  • Includes both a DAC and headphone amplifier
  • Line-level RCA and headphone amplified 3.5mm jack outputs
  • Plug and play compatibility for ease of use
  • Hardware volume control from your Raspberry Pi
  • No soldering required
  • Powered by the Raspberry Pi GPIO header
  • Compatible with Raspberry Pi Zero
  • Mounting hardware included
  • Optional IR receiver included in package
  • The JustBoom Pi Zero DAC pHAT is fully HAT compliant
  • Full driver support in Raspbian / NOOBS

Technical Information

Digi Zero

Product Description

The JustBoom Pi Zero Digi pHAT is a high resolution digital audio output add on board for the Raspberry Pi Zero. The HAT produces a high quality audio data stream that will not be negatively affected in any way.

We’ve designed the JustBoom Digi pHAT to be simple to install and use. With no soldering required and all the mounting hardware already provided you can be up and running in moments. We also include an optional IR receiver to allow remote control operation of your Raspberry Pi. It is also powered directly from the GPIO header so no extra cables or power supplies are required to connect to the Raspberry Pi.

Use cases

  • Streaming high-definition audio player
  • Multi-room audio player

Features

  • Full high quality audio – 384kHz / 32bit
  • Includes both a DAC and headphone amplifier
  • Line-level RCA and headphone amplifier 3.5mm jack outputs
  • Plug and play compatibility for ease of use
  • No soldering required
  • Powered by the Raspberry Pi GPIO header
  • Compatible with Raspberry Pi Zero
  • Mounting hardware included
  • Optional IR receiver included in package
  • JustBoom Pi Zero Digi pHAT is fully HAT compliant
  • Full driver support in Raspbian / NOOBS

I’m confused on the DAC HAT and DAC. Why would someone pick the DAC over the DAC HAT?

The DAC doesn’t require a Raspberry Pi, so if you just need a tiny DAC, there you go!

I am going to give the DAC & Amp a try for desktop, but apparently the DAC and Amp combo does not have volume control. Does Roon volume control work for this without compromising the sound quality?