Hi,
First of all, I got the HiFiBerry Amp today, and it's great, easy to set up and work great out of the box on PiCorePlayer! Connected a pair pf Canton LE 400 (Vintage, got them for 35€ on ebay, great sound!)
Just two question:
First about Power supply: I tried both a 12V 3A and a 12V 2.25A and both work. More than 70% Volume, and I have to leave the room because it gets too loud. Is there any reason to use the 3A one?
Second question: is the DAC the same as the one in the HiFiBerry DAC?
Thanks for making this great Product!!!
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7 comments
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HiFiBerry team Hi Roland,
if the 2.5A works fine, then use it. We recommend 3A to have some spare power.
The DAC in the Amp is different than our HiFiBerry DAC. The Amp is a combined DAC/Amplifier. Digital-analog-conversion is done directly in the amplifier chip.
Best regards
Daniel -
Roland Rohde Thanks! -
Roland Rohde Another question:
I read in some other post, that the amp works best "at high volume". I heard the same about your DAC. Can you explain why? Thanks.
Also, I read a little about the TI Chip you use for the amp and it appears to have quite a few extra "features" like equalization. Are there accessible via the driver, or is this all done "internally"? -
HiFiBerry team Dear Roland,
the recommendation about "high volume" is not specific to our products. All audio circuits produce some noise that is independent from the output volume. When you reduce the volume, the ratio between the music and the noise decreases (signal-to-noise ratio SNR).
The equalisation features are not yet available. However, we will show later how to implement equalisation with ALSA. One of our HiFiBerry users did this and provided a guide. We will test this and publish it later. Note that this has not a high priority at the moment, therefore it can take some time.
Best regards
Daniel -
Roland Rohde Thanks. I don't really need thpse features, was just curious.
One more question: is Dynamic Range Compression active by default? I hope not since it would have detrimental effect, especially when playing classical music. -
HiFiBerry team Dear Roland,
no, dynamic range compression is not active.
Best regards
Daniel -
Hanns Kucer Also, because of digital attenuation, the effects of quantization are more significant at low volume.
The sound is being reproduced in 16 bits of resolution. When attenuated (low volume), these 16 bits are scaled down to maybe just 10 or even less depending on how low a listening level you have.
To enjoy the full dynamics of those 16 bits, you need to play music at full volume, eg 0dB = no attenuation at all and the recording would need to take advantage of the full range. Doing this would probably damage your hearing in the long run.
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