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Sennheiser HD800: What type of amp do I need?, [was HD800 Amp query?/TOS #6]
GSARider
post Dec 23 2012, 22:40
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Hi all, came across the site and thought I'd join up. Based in the UK and have been getting into Headphones more & more due to more travel by train as well as the fact that my wife doesn't like me blasting music of an evening... laugh.gif

Anyhow, I've got a set of HD800's arriving in the new year at a really good price via a friend who is getting them for me at a wholesale rate. I've always bought Senn's as they've always been reliable and give decent sound. I recently bought a set of Amperiors and love them for travelling. I bought a Fiio E17 followed by an e09K for use at home with my MacBook Pro Retina plugged in via optical cable.

Now having looked at various reviews / sites I'm getting more confused as folk keep saying you need a 2k plus amp to drive the Hd800's and that they're somehow 'picky' when it comes to amp / dacs?

I use the E17 on a daily basis and love the sound it gives me , not sure that the E09K makes much difference for me with the Amperiors or a set of Ie80's that I also have, but I was putting that down to the low impedance of the headphones ...would I be correct in this?

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GSARider
post Dec 23 2012, 23:42
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Thanks for the reply. Spec of the E09K is as below, does this seem okay?


Dock Designed for Connecting Fiio E17
Output: 1W/16 Ohms or 80mW/600 Ohms
Frequency Response: 20Hz 20kHz
Two-Channel Output for 1/4″ & 1/8″ Plugs
Texas Instruments Main Power Amp IC
Dual Audio Outputs & USB Interface
E17 Dock Facilitates Charging & Syncing
Internal Audio Buffer Amplification
Built-in Power Converter Module
LED Power Indicator Light & Gain Switch
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saratoga
post Dec 24 2012, 00:14
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QUOTE (GSARider @ Dec 23 2012, 18:42) *
Thanks for the reply. Spec of the E09K is as below, does this seem okay?


I would basically never trust the published specs, but if they're true that amp has pretty high output voltage, but fairly crappy output impedance at ~ 34 ohms. That means it'll be loud with higher impedance headphones and won't drive low impedance headphones all that well.

If the specs for the HD800 are accurate (also questionable), then you basically have no use for the E09K as it has worse output impedance and you won't be able to use the extra voltage without blowing out your ear drums.
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skamp
post Dec 24 2012, 13:14
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QUOTE (saratoga @ Dec 24 2012, 00:14) *
that amp has pretty high output voltage, but fairly crappy output impedance at ~ 34 ohms


Where did you get that figure? FiiO rates it at < 10Ω.


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See my profile for measurements, tools and recommendations.
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Posts in this topic
- GSARider   Sennheiser HD800: What type of amp do I need?   Dec 23 2012, 22:40
- - saratoga   QUOTE (GSARider @ Dec 23 2012, 17:40) I b...   Dec 23 2012, 22:47
- - GSARider   Thanks for the reply. Spec of the E09K is as below...   Dec 23 2012, 23:42
|- - saratoga   QUOTE (GSARider @ Dec 23 2012, 18:42) Tha...   Dec 24 2012, 00:14
|- - skamp   QUOTE (saratoga @ Dec 24 2012, 00:14) tha...   Dec 24 2012, 13:14
|- - saratoga   QUOTE (skamp @ Dec 24 2012, 08:14) QUOTE ...   Dec 25 2012, 08:08
- - GSARider   So a no go with the E09K then chaps? Any other re...   Dec 24 2012, 00:26
|- - saratoga   QUOTE (GSARider @ Dec 23 2012, 19:26) Any...   Dec 24 2012, 00:37
|- - extrabigmehdi   QUOTE (GSARider @ Dec 23 2012, 23:26) Any...   Dec 24 2012, 01:04
- - GSARider   Ok we'll as I have both I will give them a go,...   Dec 24 2012, 00:46
|- - saratoga   QUOTE (GSARider @ Dec 23 2012, 19:46) Ok ...   Dec 24 2012, 00:59
|- - GSARider   QUOTE (saratoga @ Dec 23 2012, 23:59) QUO...   Dec 24 2012, 01:17
|- - extrabigmehdi   QUOTE (GSARider @ Dec 24 2012, 00:17) How...   Dec 24 2012, 01:45
|- - saratoga   QUOTE (GSARider @ Dec 23 2012, 20:17) QUO...   Dec 24 2012, 02:03
|- - extrabigmehdi   QUOTE (saratoga @ Dec 24 2012, 01:03) The...   Dec 24 2012, 02:18
|- - saratoga   QUOTE (extrabigmehdi @ Dec 23 2012, 21:18...   Dec 24 2012, 02:21
- - GSARider   Yes I saw that earlier.   Dec 24 2012, 01:57
- - GSARider   We shall see... should hopefully get my hd800...   Dec 24 2012, 02:37
|- - extrabigmehdi   QUOTE (GSARider @ Dec 24 2012, 01:37) The...   Dec 24 2012, 02:56
- - IgorC   I have E17 and HD800 here. E17 does a good work. W...   Dec 24 2012, 02:59
|- - saratoga   QUOTE (IgorC @ Dec 23 2012, 21:59) AFAIK ...   Dec 24 2012, 03:09
|- - IgorC   QUOTE (saratoga @ Dec 23 2012, 23:09) No,...   Dec 24 2012, 03:43
|- - saratoga   QUOTE (IgorC @ Dec 23 2012, 22:43) QUOTE ...   Dec 24 2012, 03:53
- - IgorC   Should investigate more if it's a digital gain...   Dec 24 2012, 04:08
- - ~Sephi~   Is it ok to run the hd800 without an external amp?...   Dec 24 2012, 06:06
|- - saratoga   QUOTE (~Sephi~ @ Dec 24 2012, 01:06) Is i...   Dec 24 2012, 07:05
- - GSARider   Fiio give the specs here for the E17 and say drive...   Dec 24 2012, 11:04
- - skamp   I used formulas from NwAvGuy's blog and I came...   Dec 25 2012, 14:29
- - IgorC   Can I ask You how did You get 1W, 0.08W, 16Ω ...   Dec 25 2012, 17:24
- - skamp   The manual for the E09K gives 900mW into 32...   Dec 25 2012, 17:32
- - GSARider   I guess the short answer is that I will find out h...   Dec 25 2012, 21:47
|- - extrabigmehdi   QUOTE (GSARider @ Dec 25 2012, 20:47) I g...   Dec 25 2012, 23:28
- - GSARider   Everything sounds flat, not just the bass.   Dec 25 2012, 23:33
- - IgorC   Probably because E17 has enabled gain at +6dB that...   Dec 26 2012, 02:02
- - GSARider   Have been experimenting earlier this evening as I ...   Dec 26 2012, 02:21
- - extrabigmehdi   Sorry if what I said was confusing. I meant: you...   Dec 26 2012, 02:25
- - GSARider   I have listened to it extensively before deciding,...   Dec 26 2012, 12:05
|- - extrabigmehdi   QUOTE (GSARider @ Dec 26 2012, 11:05) I h...   Dec 26 2012, 12:40
- - IgorC   My last post about E17 driving HD 800 was quite ne...   Jan 7 2013, 00:22
- - tpijag   Wow! join a forum and post one nearly valueles...   Apr 24 2013, 02:42
- - skamp   Sometimes, an item's worth is what the client ...   Apr 24 2013, 14:23
|- - extrabigmehdi   QUOTE (skamp @ Apr 24 2013, 13:23) Someti...   Apr 24 2013, 17:34
- - greynol   QUOTE (theancient @ Apr 24 2013, 15:18) I...   Apr 24 2013, 23:45
|- - theancient   QUOTE (greynol @ Apr 25 2013, 00:45) QUOT...   Apr 25 2013, 03:52
- - greynol   Yes, and we can leave it at that. Now we need to p...   Apr 25 2013, 05:01


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