gtrevize
New Head-Fier
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- Feb 21, 2011
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I opened a thread before because I was thinking of getting the HD's 650 or the DT 990. But I changed my mind after reading about the HE-4. The problem is that even being a pretty low impedance cans (38 Ohm), they seem to be pretty hard to drive properly. More concretely I've read about the Fiio E7 not being able to drive them (sounding muffled and not better than Sennheisher's HD 580) in comparison to a wonderful sound using a EF-5.
I have a Cretive Titanium HD soundcard with the following headphone output:
Headphone (330Ohms): 1Vrms,117dB
And I'm worried thinking if it would be able to drive them correctely too. The E7 impedance limit is 300Ohms, so the problem wasn't about that. Power I suppose?
Ok, the E7 characteristics:
Output Power: 150mW (16Ω); 16mW (300Ω)
Now if I want to compare both amps (I will assume that those mW from the E7 are rms! although I'm not sure!):
Titanium HD: Power = V^2/R = 1/300=3mW (@300Ohms); P=1/16=63mW (@16Ohms)
So, much less than the E7 (edit: and less than an E5! 12mW-150mW @16-300Ohms. And the E9 gives 1W @16Ohms with just 2Vrms. There's something wrong... Those Watts in E7/E9 specifications aren't in rms and are just peak values?).
Am I right? If that's the case I assume that buying those headphones in order to use with my soundcard is out of the question and I need the EF-5 or at least an E9.
Thanks in advance!
PS: I do not know if there's any way to use this to make an idea, but the efficiency of the HE-4 in the specifications is 86 DB.
Original post what I reffer before:
Quote:
I have a Cretive Titanium HD soundcard with the following headphone output:
Headphone (330Ohms): 1Vrms,117dB
And I'm worried thinking if it would be able to drive them correctely too. The E7 impedance limit is 300Ohms, so the problem wasn't about that. Power I suppose?
Ok, the E7 characteristics:
Output Power: 150mW (16Ω); 16mW (300Ω)
Now if I want to compare both amps (I will assume that those mW from the E7 are rms! although I'm not sure!):
Titanium HD: Power = V^2/R = 1/300=3mW (@300Ohms); P=1/16=63mW (@16Ohms)
So, much less than the E7 (edit: and less than an E5! 12mW-150mW @16-300Ohms. And the E9 gives 1W @16Ohms with just 2Vrms. There's something wrong... Those Watts in E7/E9 specifications aren't in rms and are just peak values?).
Am I right? If that's the case I assume that buying those headphones in order to use with my soundcard is out of the question and I need the EF-5 or at least an E9.
Thanks in advance!
PS: I do not know if there's any way to use this to make an idea, but the efficiency of the HE-4 in the specifications is 86 DB.
Original post what I reffer before:
Quote:
Originally Posted by cnk15 /img/forum/go_quote.gif
(...)
Setup
I have listened to the HE-4's in 2 different setups. The first setup is from my PC to FiiO E7/E9 via USB connection and the second setup is via my PC via Creative Labs X-Fi Titanium Fatal1ty line out to the HiFiMan EF-5.
Listening Impressions
With the FiiO setup, I had to put it on high gain and to me the HE-4's didn't really sound any different than the 580's besides requiring the higher gain setting. If anything, the sound was a bit muffled. I don't experience this with the 580's so I was a little disappointed at first.
I then switched over to the EF-5 setup. Wow!! What a difference. The sound was crystal clear and I could hear details in the music that I couldn't hear before. The bass hits low and the highs are not ear piercing. I was actually quite surprised that the HE-4's were that much better than my 580's. The sound stage is broader as well and I just feel more enveloped in the music.
(...)
Follow Up
I decided to take the E7 out of the picture to make it more of a apples to apples comparison. Here's what I found after listening to a variety of songs back to back. The E9 can drive the HE-4's just fine, but there is a small difference with the EF-5. The EF-5 brings out just a little bit more detail and sounds a tiny bit fuller. So it appears that the muddiness I was hearing was due to the E7 DAC. If I didn't have both to compare back to back, I would say that I would be happy with the E9.