Everything for best audio streaming experience
VoltaStream AMP1 combines everything you’ll need for creating state-of-the-art speaker systems.
It was engineering to meet all the requirements of a modern streaming amplifier. So it comes not only with a fully digital class-D amp but also with 5 GHz ac wireless, an optical TOSLINK receiver and of course analog LINE-IN.
It runs a specially for audio created Linux distribution. PolyOS includes all major streaming technologies and is directly developed / maintained by us. Really easy to use, best sound quality and regular updates. Read more about it HERE.
Smart and fully digital amplifier
The main audio component is the 2x 35 Watt class-D amplifier. While the majority of other class-D amplifiers in this power category are working internally with analog signals, the one used in VoltaStream AMP1 is fully digital. The digital audio signal is fed via I2S to the amplifier IC. There it is processed in the integrated DSP and afterwards directly converted to a PWM signal. This one gets amplified and finally converted to analog in the filter inductors for feeding your speakers.
Thanks to the integrated and easy to use DSP improving your sound experience was never easier. It starts with simple bass and treble controls directly available via ALSA (e.g. with alsamixer). Furthermore you can also create a custom EQ set or even implement a crossover for powering e.g. a two channel active speaker.
Excellent wireless connectivity
To give you an even better streaming experience VoltaStream AMP1 comes with an embedded 5 GHz ac WLAN + Bluetooth module. Furthermore an 100 mm external antenna is included for giving you the best flexibility.
Having 5 GHz ac WLAN capability is really a big step forward. As far as we know no other single-board-computer in this class does offer this currently. Especially not in this compact size and with so many audio features. Robust WiFi is the key for what we have in mind with our operating system (PolyOS). In-room audio distribution (wireless left / right speaker) and multiroom are just around the corner.
Digital and analog auxiliary inputs
One important thing for an amplifier module is auxiliary connectivity. Although VoltaStream AMP1 is your perfect choice for streaming audio content over network you might want to connect other analog or digital sources. No Problem! It comes with a high quality analog-digital-converter (ADC) as well as optical TOSLINK input.
Special attention was payed to the ADC. It’s a high quality one with 103 dB SNR and something called “energysense”. It is able to detect incoming signals and send an interrupt to the host processor which can then decide to use the ADC as an audio source.
Furthermore a special muxing circuit was added. Audio content from the ADC can be routed directly to the amplifier instead of going through the main CPU. This offers the lowest latency possible.
Low cost, compact size and partially open
Unless other solutions available VoltaStream AMP1 offers the best price/performance ratio possible. No other board will give you so many audio streaming related features. This all combined with the excellent NXP i.MX6ULL processor and the outstanding wireless performance makes this board really a must-have.
It comes in the Raspberry A+ form factor (65 x 56 mm) and offers similar GPIO connectivity.
Although we are very addicted to open-sourcing everything we have currently decided to not publish the full production files for the AMP1. Nevertheless you can find the complete schematics in the DOCUMENTATION tab. If you are looking for something fully open see our VoltaStream ZERO.
- VoltaStream AMP1 board
- 100 mm external antenna with adhesive
Additionally you will need
- power supply with 12…20 Volt (max. 24 V) and 30 Watt output power
- microSD card with at least 2 GB capacity
- microSD card reader and a host computer for flashing the OS
- some speakers
Below you can find support material in PDF format. If you have additional questions never hesitate to contact us directly.
A short summary for how to get started. Shows you where to connect everything and includes instructions for how to prepare a SD card, setting up network and how to stream your first audio samples.
Release date: 2017-09-21
System Reference Manual
Everything explained in detail. Here you will find all hardware related things like dimensions, power supply and accessible GPIO’s. It gets you also covered with details about the Linux kernel and the U-Boot bootloader.
Release date: T.B.D.
The full schematic of VoltaStream ZERO in a handy PDF. Everything you need to understand how the hardware interacts.
Release date: 2017-09-21
Below you can find a list of operating systems that can easily be flashed onto a microSD card and will bring your VoltaStream AMP1 to life.
The operating system specially created for VoltaStream from scratch. It is based on Yocto, super light-weight, offers the most important streaming services and should give you the best out-of-box experience. It currently includes shairport-sync, a DLNA renderer, librespot and a special update mechanism. This is a work-in-progress and we are working very hard on improvements. There are also plans for a dedicated smartphone app which will expand the feature list a lot. You can expect updates several times a month. They may by visible through the integrated updater first before they get published here. More details HERE.
THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Furthermore PolyOS includes many open source software solutions with different licenses. Please see the sourcecode (use the link below) to understand which programs are used and under which license they are released.
Release date: 2017-09-17
ChangeLog : LINK
PolyBian is based on Debian which is a widely spread Linux distribution and will give you an easy entry point if you want quickly create something on your own. For example it is known from Raspbian – OS for the Raspberry Pi – and you can easily reuse guides and instructions were initially made for Raspberries. This distribution does not come with any audio related software by default but you can easily install it on your own. Includes drivers for our tested USB WiFi sticks as well as the DAC and the TOSLINK output. Updates not on a regular basis and requires refreshing each time.
Release date: 2017-08-09
See the GETTING STARTED guide available from the DOCUMENTATION tab.
Please find several frequently asked questions below. From time to time we might add topics if we see a demand for clarification.
Where is the TOSLINK input and can it be used at the same time with analog input?
The optical TOSLINK input is directly integrated into the 3.5 mm audio jack and requires a small adapter if you want to use a standard optical cable. It is not directly possible to use both at the same time as the jack only accepts one plug.
Why is there no super-fast multicore processor?
We have chosen to use a very well documented and perfectly supported processor (SoC) with long term availability. For audio streaming no powerful processor is required. The one we are using is much faster than required for such simple tasks and offers a lot of headroom. So really nothing you should be concerned about. Furthermore it consumes much less energy than multicore processors. This is a very important point as it will be in always-on mode most of the time.
What about WLAN and BT?
VoltaStream AMP comes with an integrated 5 GHz AC wireless module. Although the digital audio output of the BT modem is brought the the host processor, BT audio streaming is currently not supported. The hardware is ready for it and we are working on a solution.
Is VoltaStream AMP1 certified for CE, FCC, … ?
No, it is sold as a evaluation board/kit and does not need certification. It is not considered to be a finished end-product fit for general consumer use. Persons handling this evaluation board/kit must have electronics training and observe good engineering practice standards. Read the full disclaimer under which we are selling our hardware HERE.