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)
Additionalinformation
WEIGHT 0.075 kg
DIMENSIONS 13 x 7.5 x 2.5 cm
https://www.pi‐supply.com/product/justboom‐amp/2/6/18
