As promised earlier, I took some time to compare my Raspberry Pi 2 and Intel HTPC as s music transport.
Before going into further details, I would like to inform that both my transports are connected to my AVR via HDMI 1.4. AVR is running in Pure direct mode (i.e. only left and right channels are playing while other non mandatory circuits are turned off).
My current configurations in comparison:
1. Rasp-pi 2 with Rune > HDMI (
Belkin) > AVR (
Yamaha A810 - HDMI In 1)
2. Intel HTPC (Intel G2020+Intel DZ75ML-45K+NVidia GT610) with Foobar > HDMI (
Belkin) > AVR (
Yamaha A810 - HDMI In 2)
Speakers -
Monitor Audio BX2 with
Cambridge Audio Symphony 400 speaker cable
The agenda:
To figure out which system I should be using for future as a transport in my chain.
My DAC is on its way. The USB implementation of my DAC is not the best in the world, so I needed an effective and nice USB (or I2S) to S/PDIF (Coaxial) converter at a stringent budget of $150.
The background:
In case of PC, I had shortlisted few USB to Coaxial converters like-
1.
Musiland Monitor 01 USD
2.
Gustard U12
3.
M2Tech Hiface Two
4.
Weiliang XMOS U8 Asynchronous USB to Coaxial
In case of Raspberry Pi 2, I had shortlisted the following-
For USB solution the above 4 devices and in addition to this for I2S to S/PDIF (Coax)
1.
Hifiberry Digi+ (transformer version).
As Raspberry Pi LAN controller is built on USB 2.0 controller, I am a bit skeptical to use USB to S/PDIF converter while gigabit lan is connected. I am a bit biased towards I2S to S/PDIF.
I had to choose either one to make sure which device should I get first.
The Procedure
My procedure is not the best or scientific to determine or prove anything.
I played few tracks on both the devices using android apps (Foobar Controller and MPDroid) and switched between them using AVR's Remote.
No SPL meter or any scientific equipments were used during this process.
In Rasp Pi and Rune configuration, I was getting distortion at higher volumes (Or when hardware volume was disabled). So, I decreased the hardware volume to 94%.
I matched PC volume by changing foobar volume to 90%. Now both the devices seemed to be giving same SPL.
Songs Compared Side-by-side
1. Sting - Desert Rose:
In PC: Almost same on both the devices
In Raspberry Pi: Almost same on both the devices
Winner: Tie
2. Poets of the fall - War:
In PC: Its good
In Raspberry Pi: Soundstage is bit more wider. A bit more refined in highs and mids
Winner: Raspberry Pi
3. Poets of the fall - Carnival of rust:
In PC: Sounded nice to my ears
In Raspberry Pi: Soundstage is bit more wider. A bit more refined in highs and mids
Winner: Raspberry Pi
4. Eva Cassidy - Erowning in the sea of love:
In PC: It seemed that its a bit held back.
In Raspberry Pi: Soundstage is bit more wider. A bit more refined vocals. Guitar strums sounded more realistic
Winner: Raspberry Pi
5. Eva Cassidy - Time after time:
In PC: It seemed that its a bit held back. Comparatively not so profound
In Raspberry Pi: Soundstage is bit more wider. A bit more refined vocals. Guitar strums sounded more realistic
Winner: Raspberry Pi
6. George Michael - Careless whisper:
In PC: Lows are bit better. Mids and highs are almost same
In Raspberry Pi: Mids and highs are almost same
Winner: PC
7. Julio Iglesias - Can't help falling in love:
In PC: Very close to Rasppi
In Raspberry Pi: Wider soundstage, crisper vocals (though it was very close)
Winner: Raspberry Pi
8. Julio Iglesias - When I need you:
In PC: A bit tiring when listened back to back
In Raspberry Pi: More balanced. Very pleasing for long listening hours. Not tiring
Winner: Raspberry Pi
9. Michael Jackson - Thriller:
In PC: Its nice sounding
In Raspberry Pi: More balanced. Very pleasing for long listening. Starting from door opening, boots... its just thrilling
Winner: Raspberry Pi
Conclusion
It was no-brainer that I finally selected Raspberry Pi as my sole transport in my chain.
I am guessing that Gordon and team from
iQaudio might be working on some I2S to S/PDIF converter for Raspberry Pi. If that is going to happen, I can wait for another couple of months more to consider that as well.