I'm wondering whether or not anyone else has experienced any "hum"/background noise when using their DC-1s with In Ear Monitors (IEMs).
I got a pair of Logitech UE 600vis, while not out of this world IEMs, they are quite reasonable. When plugged into my DC-1, there is a very noticeable hum/noise. It's like white noise with a little vibrating signal on top of it that would seem to be close to the 60hz.
This happens with no inputs selected and only power and my headphones connected to it.
The noise level doesn't change with volume or input
My Beyer T70s are dead silent
Some other notes, it is noticeably louder than the background noise on my MacBook Pro's headphone output, which is in turn noticeably louder than my iPhone's headphone output.
I'm going to try these headphones with my DC-1 at home... and also with the O2 headphone amp, both connected to the DC-1 and w/o any connections.
Just figured I'd see if others had noticed anything like this.
Last Edit: Jan 23, 2014 20:13:52 GMT -5 by GreenKiwi
Post by paintedklown on Jan 23, 2014 19:45:34 GMT -5
I get hum with earbuds in, but it does go up and down with the volume level (no noise unless at a high volume and music paused). I assumed it was just the usual "amp noise" (sounds like white noise) that you get with amps that aren't dead silent.
I don't have any headphones or IEM's, but your symptoms make it sound like you inserted the IEM's and trapped a fruit fly between the IEM's and your ear.
XMC-1 DIRAC Full; Oppo 105/Roku Ultra to Panny AE4000 w/106" screen; UltraRendu to LH Labs Geek Pulse X-Infinity; nCore nc400's or Prima Luna Premium Prologue to Maggie 1.7's; Rythmik F25; XPA-5 to CC-470v3 Center/ERD-1's; Thorens TD166 MkII/Denon DL207/XPS-1; 5-zone Sonos w/Def Tech AW5500's @ deck/pool/master bath & Sony SS-MB105/Polk R10 @ great room & kitchen. Two headphone setups: Hifiberry/BasX A100 and Allo BOSS/Schiit Asgard 2 (each to Senn 600's). PC w/Airmotiv 3b's. Roon user.
EARPHONE TYPE:In-ear DRIVER TYPE:Single, top-firing armature IMPEDANCE:13 ohms, 1 kHz SENSITIVITY:115 dB SPL/mW, 1 kHz FREQUENCY RESPONSE:20 Hz - 20 kHz NOISE ISOLATION:26 dB INPUT:3.5 mm (1/8 inch), angled CABLE LENGTH:48 inch (121.9 cm)
At home I tried my O2+ODAC and it was slightly different than the one at work. It had a noise floor that went up as the volume was turned up, but the noise floor is completely quite at volume points well past reasonable listening levels.
- Remove the USB connection completely. - Then....physically disconnect the DAC entirely from the AC power. Do not standby or anything. Pull out the power plug from the wall. - Put the plug back in and start it up. - Use a different input other than USB temporarily like a blu ray player or game console. See what happens now.
Last Edit: Jan 23, 2014 23:48:55 GMT -5 by garbulky
Transport: Sony BDP 5100 Blu ray player spdif PC using Musiland Digital Times WASAPI via BNC connection - DAC: DC-1->XLR XPA-1 , RCA->Basx A-100 CD: Denon DCD 600 PCM 61 DAC. RCA Amp: XPA-1 gen 2 using XLR connections. Speakers: Axiom Audio m80 V3, Sennheisser HD700 headphones. two pairs 12 guage each bi-wire speaker cables per monoblock Headphone amp: Basx A-100 (INCREDIBLE VALUE!!)
Other equipment: Asus Xonar essence ST Behringer UCA 202 Sennheiser HD600
I've experienced the same thing -- low noise -- like electrical hum. Mine does not change as the volume on the DC-1 changes but is constant. I've tried isolating it away from my monitor, using both the power cord supplied with the unit and a shielded cord (1 m) bought from Emotiva. I've tried with different USB ports from my Mac Mini (late 2013). Tried plugging into different outlets in the room. Finally I've tried it with nothing at all plugged into any of the inputs to the DC-1 and the hum is still present. I'm using Bose over the ear noise canceling phones (the hum from these is more at a low level hiss) and also use Apple stock earbuds (the hum from these is more like a true electrical hum). With music playing at -100 to -20 db into the Bose the hum is still noticeable but the music overcomes it from -20 db and up. The impedance is different for the apple buds so the volume range in which the hum is noticeable is different but still there.
The interesting thing with my situation is, that after I would play music (either from iTunes or streaming directly from Audirvana) the hum would go away and there would be silence in the background when the music was stopped. To check, I power cycled (on to standby and back to on -- or a soft power cycle) and still silence and no hum. So to test a theory I disconnected the DC-1 entirely and took it to a part of my home where there are no carpets but wood and porcelain floors only. I made sure there was no static build up on me, the DC-1 or in the earbuds -- set the DC-1 on top of a granite counter, discharged myself once more by touching a steel object -- turned on the DC-1 and there was nothing but silence -- dead silence. My previous test whereby there was nothing connected to the DC-1 but the power cord (as was the case for this step just described) was done in my static-y room above the garage. It is winter-time here and quite dry. In my case at least, I believe the hum is a result of built up static. I could test the theory fully by yanking my mac mini, monitor and DC-1 out of here to a static free (or nearly so) area of the home -- but that's a lot of work.
Post by tiframelock on May 22, 2014 17:46:52 GMT -5
Have you already tried using a cheater plug on the power cable of the DC-1? This can work at times if its power line noise. I'm very interested to see if this problem gets solved as the DC-1 is one of about 3 DAC's I'm currently looking at and I will be using Westone W40's with it sometimes.
I have a Fischer Audio DBA mkII..I don't get any audible noise when listening to the headphone out..I get some audible noise when I try an Fiio e10 and I have found out it has something to do with the USB cable..are you using USB?