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REVIEW: Head-direct.com HiFiMan EF2 tube Hybrid Amp with USB DAC - Page 50

post #736 of 1263
1/2/10 at 10:49pm
Great, that's what I was looking for. I was just kind of curious as to what the routine should be. Thank you very much.
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Gear mentioned in this thread:

Denon AHD2000 High Performance Over-Ear Headphones
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Hifiman EF2A Usb Headphone Amplifier
Sennheiser HD 800 Headphones
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post #737 of 1263
1/3/10 at 8:12am
Quote:
Originally Posted by espandon View Post
Where did you get this idea?
Product page

Thought the price used to be $189 too, as opposed to $169 now but I didn't buy direct from Head-Direct so I can't be sure.
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post #738 of 1263
1/6/10 at 9:51pm
Have my first problem with the EF2.

Got myself a new KDS 26" LCD, and whenever the LCD is on, the EF2 has a hum. It is picking interference from the inverter on the LCD..

How can I prevent this when I have such a small desk?
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post #739 of 1263
1/6/10 at 11:45pm
Do any of you guys use the EF2 with the K701? Will it be sufficient enough to drive it?
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post #740 of 1263
1/7/10 at 12:03am
Quote:
Originally Posted by zeromacro View Post
Do any of you guys use the EF2 with the K701? Will it be sufficient enough to drive it?
Knowing the 701s reputation for being hard to drive, I'd say NO! This isn't a very powerful amp.
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post #741 of 1263
1/7/10 at 12:05am
Thread Starter 
Quote:
Originally Posted by zeromacro View Post
Do any of you guys use the EF2 with the K701? Will it be sufficient enough to drive it?
Head-Fi: Covering Headphones, Earphones and Portable Audio - Search Results

After the question was asked a million times, someone only posted within the last week that they work okay together.
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post #742 of 1263
1/7/10 at 1:18am
Quote:
Originally Posted by HeadphoneAddict View Post
Head-Fi: Covering Headphones, Earphones and Portable Audio - Search Results

After the question was asked a million times, someone only posted within the last week that they work okay together.
Total Shocker

Perhaps the reputation of them being hard to drive is being overplayed?

btw, "Johansson" is spelled wrong in your sig.
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post #743 of 1263
1/7/10 at 2:51am
Thread Starter 
Quote:
Originally Posted by roker View Post
Total Shocker

Perhaps the reputation of them being hard to drive is being overplayed?

btw, "Johansson" is spelled wrong in your sig.
I posted back in February that the iBasso T3 in high gain with bass boost on was able to drive the K702 decently (boomy3555 loaned us for a meet), so I don't see it as being impossible for the EF2 to drive them. But, I don't have a pair and haven't tried them, so I didn't want to chime in and find out I was wrong.

In the sig that is a quote from another user, so the source spelled it wrong.
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post #744 of 1263
1/7/10 at 3:32am
I can't say exactly how well they drive them, but with the volume at 75, foobar at 10dB, and the knob on the ef2 at around 4 o'clock, the volume is pretty much sufficient. I guess that's kind of just my opinion, though. If I were to turn up the volumes more it would be much more than enough, I just don't like having things high/maxed all the time.
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post #745 of 1263
1/10/10 at 1:52am
My EF2 is buzzing constantly 50% of the time now.. It's that same buzz it makes when you first turn it on...

It's really annoying me now...
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post #746 of 1263
1/10/10 at 3:41am
Thread Starter 
Quote:
Originally Posted by mmd8x28 View Post
My EF2 is buzzing constantly 50% of the time now.. It's that same buzz it makes when you first turn it on...

It's really annoying me now...
Does it do that when plugged into the wall in a different room? What about with a different source? Do you have other tubes to try? If it really wont go away after changing that around, you should contact Head-direct.
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post #747 of 1263
1/10/10 at 4:14am
Well it seems to be related to what's around it. Source is just USB, nothing analog, so the sound quality should all be on the EF2 at this point since it's its DAC.

But, for example, if I turn off my LCD monitor, the buzzing gets more quiet, but not completely. Sometimes even with the LCD on, the buzzing will go away by itself..

I can stimulate it when it buzzes. If I give it a kick drum sound, the buzzing gets loud then quiet nearly right after the sound.. Almost like a DC filtering capacitor has failed.
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post #748 of 1263
1/10/10 at 4:22pm
Thread Starter 
Hmm, not sure how to resolve that - you could try some different AC noise filtering products for home theater or UPS battery backup for PC, and plug the amp into a different circuit. If you have a noisy PC and the amp is quiet in another circuit in another room with a different source, I don't know which to blame.
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post #749 of 1263
1/10/10 at 6:09pm
The PC itself should be fairly quiet. It's a Mac Pro and it has LOTS of grounds inside, even the side of the case has ground padding to ensure no EMF problems.

I'll try it in another room, hooked up to no source and volume up, to see if it picks anything up.

It honestly sounds like a 60Hz hum..
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post #750 of 1263
1/12/10 at 12:58am
Try taking out the tubes and using it, it will still play just with less amplification (ss only). This may isolate the problem.
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Gear mentioned in this thread:

Denon AHD2000 High Performance Over-Ear Headphones
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Hifiman EF2A Usb Headphone Amplifier
Sennheiser HD 800 Headphones
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