Difference between revisions of "HiFiBerry Amp 2"
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− | The HiFiBerry Amp 2 is an integrated amplifier and sound card HAT for the Raspberry Pi capable of playing audio at 24 bits/192kHz. | + | The HiFiBerry Amp 2 is an integrated [[Is Component::amplifier]] and [[Is Component::sound card]] [[Has Interface::HAT]] for the [[Raspberry Pi]] capable of playing audio at 24 bits/192kHz. |
== Configuration == | == Configuration == |
Revision as of 09:09, 31 December 2020
HiFiBerry Amp 2 | |
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The HiFiBerry Amp 2 is an integrated amplifier and sound card HAT for the Raspberry Pi capable of playing audio at 24 bits/192kHz.
Configuration
Note that the following is encapsulated in the autopilot script hifiberry, which can be executed with
python -m autopilot.setup.run_script hifiberry
Device Tree
In /boot/config.txt, remove or comment out the following to disable the built-in audio[1]:
dtparam=audio=on
And add the line:
dtoverlay=hifiberry-dacplus
ALSA
Optionally, you can make the card the default sound-card for ALSA by creating a /etc/asound.conf file with the following
pcm.!default { type hw card 0 } ctl.!default { type hw card 0 }
GPIO Usage
The following pins are reserved and can't be used for other purposes[2]:
Board Pins | BCM # | Use |
---|---|---|
3, 5 | 2, 3 | I2C Configuration |
12, 35, 38, 40 | 18-21 | Sound interface |
7 | 4 | Mute -- pulling low mutes (so pull it up!) |
Specs
Recommend powering with an 18V power supply!
Recommended operating voltage | 12-20V | |
Absolute maximum operating voltage | 24V | |
Maximum output power | 60W | |
THD+N | <0.02% | typical, output power 0.1-10W |
SNR | 104db | typical |
Frequency response | 20-20000Hz | output filter characteristics depending on specific speaker parameters |
Typical output power per channel | 14W | Vsupply=12V, Rspk = 4Ohm, THD+N <0.1% |
18W | Vsupply=18V, Rspk = 4Ohm, THD+N <0.1% | |
20W | Vsupply=24V, Rspk = 4Ohm, THD+N <0.1% | |
8W | Vsupply=12V, Rspk = 8Ohm, THD+N <0.1% | |
17W | Vsupply=18V, Rspk = 8Ohm, THD+N <0.1% | |
28W | Vsupply=24V, Rspk = 8Ohm, THD+N <0.1% | |
Maximum output power per channel | 15W | Vsupply=12V, Rspk = 4Ohm, THD+N <10% |
30W | Vsupply=18V, Rspk = 4Ohm, THD+N <10% | |
44W | Vsupply=24V, Rspk = 4Ohm, THD+N <10% | |
10W | Vsupply=12V, Rspk = 8Ohm, THD+N <10% | |
20W | Vsupply=18V, Rspk = 8Ohm, THD+N <10% | |
38W | Vsupply=24V, Rspk = 8Ohm, THD+N <10% | |
Sample rates | 44.1-192kHz |