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Do the rear-mounted power port affect sound quality at all? The whole point of having the power port front-mounted was to optimize the SQ, right?
It was designed to go into your pocket. The dude that created, did a special patent on it, others could build and sell it, but they cant fiddle too much with the original design.
The power is still going to the same spot on the board, they just took wires and moved the jack to the back. They cant alter the board because it is under the creative Commons no derivatives licence.
Ah, so the answer is no? The extra wiring has no effect on sound quality?
It depends how long cables from your house to electric plant are.
No it was to optimize cost.
Having the power supply input on the back panel would be a good thing IF the audio input had been left on the front panel.
For their RCA-1/4" O2 version Massdrop has moved the RCA jacks to the back panel, right next to the power input jack. That creates a problem if the Massdrop O2 uses AC voltage for its power supply like the original O2 did. (I have an original one with the 3.5mm input jack on the front, quite a few years old now. I use a 117V AC to 18V AC adapter, and it is dead quiet.) If there is 16 to 20V AC (at 60Hz) coming in right next to the line level audio inputs, it's likely that some hum will be injected from the high current power supply AC into the very low current audio signal inputs. That would most definitely impact sound quality, and not for the better.
However, if the power supply has been changed so that it accepts DC voltage instead of AC, then the above comments no longer apply.
So to answer your question: In this case, moving the power supply input jack to the back panel may have hurt the sound quality, unless this version of the O2 has been redesigned to accept DC power at its power input jack instead of AC power.
Does anyone know the specifics about this?
Can anyone with the required background confirm if this is true? I.e. Does the 12 VAC on the back of the desktop edition affect the sound quality if the RCA input is used?
Engineering background: rather not, should be measured but assuming that people do that on many forums it's ok thing to do.
Audiophile background: you are missing 0,01% from 1% of audio nirvana you can get with that cheap useless box.
This is low voltage DC, AC to DC conversion takes place in a wall adapter.
I just checked the adapter. It converts 220 V of AC to 12 V of AC, so it does not convert to DC at all. Webst, does that change your assessment?
Excuse me this mistake. Nevertheless it's not tesla coil to induce any audible noise in the circuit. If you can wait I'll let you know when mine arrives.
So that means that the 12 VAC port on the back of the desktop edition should not affect the sound quality if the RCA input is used? Yes, please confirm when it arrives. I'll wait.
No noise problem present. Also you can put two NiMH 9V accus inside and get rid of external power supply while listening.
Thanks for confirming! I wish you a lot of fun with your O2. Mine also arrived recently, but I have not been able to test it yet.