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| Headphone Amps (full-size) Discussion of desktop headphone amps. |
05-08-2009, 04:39 PM
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Headphoneus Supremus
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Join Date: Nov 2008
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Quote:
Originally Posted by op2003
I'm using the Zero with the Earth-HDAM and 2xLM4562 and this is a very nice combinations with the K701s as it sounds quite "warm".
But i noticed that the Zero doesn't have another power to drive the K701s properly, as i can turn the volume knob up to 4o'clock without getting blown away (this is probably current-related, but i'm not an electrotechnical engineer).
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I had no idea the 701s required so much to run? My Zero runs the HD650s great. What is the impedence of the 701s?
.
__________________
<<<Les Garten>>> Leave the gun, take the cannoli -- Fat Clemenza circa 1950
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05-08-2009, 04:41 PM
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Despite their low impedance (not sure but I think they are 62ohm) the 701s are notorious for being very difficult to amp properly. Don't quite understand why, but that's the general consensus.
__________________
Xfi Fatal1ty (Coax, ASIO)-->Compass (OPA Sun V2)-->Little Dot MKIII (GE 5-star)-->HD600/SR325is/HFI-780 (S-Audio recable)/DT250-80
Gone: SR80, SR225, Sony 7506
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05-08-2009, 04:48 PM
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Headphoneus Supremus
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Join Date: Nov 2008
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Quote:
Originally Posted by ScottieB
Despite their low impedance (not sure but I think they are 62ohm) the 701s are notorious for being very difficult to amp properly. Don't quite understand why, but that's the general consensus.
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So 62 ohm Headphones can require the Zero to be twisted to 4:00 on the dial? I haven't listened to my Zero in a while but this seems strange. I never felt my Zero was low on Gain. That's amazing!
.
__________________
<<<Les Garten>>> Leave the gun, take the cannoli -- Fat Clemenza circa 1950
Conversation with future Nobel Prize winner Doris Lessing in 1969: Lessing: "You do still have gangsters [in Chicago], don't you?" Studs Terkel: "Yes, but these days they're mostly in business, or politics."
"We hang the petty thieves and appoint the great ones to public office" Aesop
Ich Bin Ein Europeaner!
JOIN TEAM Snake Oil
Head-Fi Feedback<<>> ebay Feedback<<>> Pink Noise Burn-In Tool!!
I Changed My Windows Desktop to a PIC of the Audio-GD REF 1
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05-08-2009, 05:43 PM
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Head-Fi'er
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Join Date: Feb 2009
Location: Germany
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It's actually quite easy: If you apply the same output voltage to a high and a low resistor (e.g. 600Ohm HD650 vs. 62Ohm K701), you will get as a result low and high current, because I=U/R. So with low impedance cans the amp has to supply a high current. I suppose that could be part of an explanation, why the K701s are hard to drive.
Edit: Normally my volume knob is between 10 and 12 o'clock. I just tried to turn it beyond 12 o'clock to see how far it can go. It gets quite loud at 4 o'clock, but it's not unbearable and i hear no distortion.
Last edited by op2003; 05-08-2009 at 05:46 PM.
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05-08-2009, 05:56 PM
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Headphoneus Supremus
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Join Date: Nov 2008
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Quote:
Originally Posted by op2003
It's actually quite easy: If you apply the same output voltage to a high and a low resistor (e.g. 600Ohm HD650 vs. 62Ohm K701), you will get as a result low and high current, because I=U/R. So with low impedance cans the amp has to supply a high current. I suppose that could be part of an explanation, why the K701s are hard to drive.
Edit: Normally my volume knob is between 10 and 12 o'clock. I just tried to turn it beyond 12 o'clock to see how far it can go. It gets quite loud at 4 o'clock, but it's not unbearable and i hear no distortion.
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Well, I understand what you are saying, but here's my experience that I'm using and why what you said makes no sense to me. Except for Scotties Explanation.
First The HD650s are 300 ohm. Just wanted to correct that.
I have lots of low impedance cans, Denon, Grados, 80 ohm beyers, DX1000. None of them are difficult to drive for the Zero, "that I remember".
But I may hook it back up, I need to work on it anyhow.
I'm not sure there's a spec for sensitivity in Headphones, just like in speakers, just don't remember seeing it. That would explain it.
.
__________________
<<<Les Garten>>> Leave the gun, take the cannoli -- Fat Clemenza circa 1950
Conversation with future Nobel Prize winner Doris Lessing in 1969: Lessing: "You do still have gangsters [in Chicago], don't you?" Studs Terkel: "Yes, but these days they're mostly in business, or politics."
"We hang the petty thieves and appoint the great ones to public office" Aesop
Ich Bin Ein Europeaner!
JOIN TEAM Snake Oil
Head-Fi Feedback<<>> ebay Feedback<<>> Pink Noise Burn-In Tool!!
I Changed My Windows Desktop to a PIC of the Audio-GD REF 1
Witness the Birth of the Phoenix Phoenix
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05-08-2009, 05:59 PM
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Yeah my explanation wasn't even about the LOUDness, per se, just that to sound GOOD the 701s seem to need a good amp. But I've only ever heard them a few times and have never owned them, so this is just what I'm told. Even with my HD600s (also 300ohm) the Zero was plenty loud.
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Xfi Fatal1ty (Coax, ASIO)-->Compass (OPA Sun V2)-->Little Dot MKIII (GE 5-star)-->HD600/SR325is/HFI-780 (S-Audio recable)/DT250-80
Gone: SR80, SR225, Sony 7506
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05-08-2009, 06:00 PM
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Head-Fi'er
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Join Date: Feb 2009
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There is a sensivity spec for headphones, we were discussing it in this thread.
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05-08-2009, 06:11 PM
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Headphoneus Supremus
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Join Date: Nov 2008
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Quote:
Originally Posted by op2003
There is a sensivity spec for headphones, we were discussing it in this thread. |
Interesting thread. Thanx!
.
__________________
<<<Les Garten>>> Leave the gun, take the cannoli -- Fat Clemenza circa 1950
Conversation with future Nobel Prize winner Doris Lessing in 1969: Lessing: "You do still have gangsters [in Chicago], don't you?" Studs Terkel: "Yes, but these days they're mostly in business, or politics."
"We hang the petty thieves and appoint the great ones to public office" Aesop
Ich Bin Ein Europeaner!
JOIN TEAM Snake Oil
Head-Fi Feedback<<>> ebay Feedback<<>> Pink Noise Burn-In Tool!!
I Changed My Windows Desktop to a PIC of the Audio-GD REF 1
Witness the Birth of the Phoenix Phoenix
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05-08-2009, 06:17 PM
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500+ Head-Fi'er
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Quote:
Originally Posted by les_garten
Interesting thread. Thanx!
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Indeed, x2!
__________________
Xfi Fatal1ty (Coax, ASIO)-->Compass (OPA Sun V2)-->Little Dot MKIII (GE 5-star)-->HD600/SR325is/HFI-780 (S-Audio recable)/DT250-80
Gone: SR80, SR225, Sony 7506
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05-09-2009, 01:33 AM
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500+ Head-Fi'er
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Join Date: Jun 2008
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My Senns are 600ohm, and the Zero seemed to drive them nicely... Both in terms of outright volume, and the punch needed to give them a full sound.
I wonder if the 4562s are struggling? Maybe try swapping back to the original opamps, or the LT models recommended?
~Phewl.
(drunkered.)
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Senn 480II-13R cans, overshadowed by...
Black Stax SRS-4040II rig - awesome! Loving it! Certainly worth most of the extortionate amount of pennies it cost. ;-)
Compass DAC by Audio-GD - very, very nicely made with a lovely sound. First UK owner?
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05-09-2009, 08:48 AM
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Head-Fi'er
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Join Date: Feb 2009
Location: Germany
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Please do not misunderstand me... the comfortable listen volume with my Zero/K701 is about 10-12o'clock and the Earth/LM4562 combination sounds better to me than LT1058/LT1364/NE5532/...
The best way to describe the volume knob position/output power relation would be a logarithmic curve.
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05-09-2009, 07:13 PM
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Headphoneus Supremus
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Join Date: Nov 2008
Location: S. FLorida
Posts: 3,183
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Quote:
Originally Posted by op2003
Please do not misunderstand me... the comfortable listen volume with my Zero/K701 is about 10-12o'clock and the Earth/LM4562 combination sounds better to me than LT1058/LT1364/NE5532/...
The best way to describe the volume knob position/output power relation would be a logarithmic curve.
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I don't remember getting over about 12:00 with any set of canz, high or low impedance on mine.
.
__________________
<<<Les Garten>>> Leave the gun, take the cannoli -- Fat Clemenza circa 1950
Conversation with future Nobel Prize winner Doris Lessing in 1969: Lessing: "You do still have gangsters [in Chicago], don't you?" Studs Terkel: "Yes, but these days they're mostly in business, or politics."
"We hang the petty thieves and appoint the great ones to public office" Aesop
Ich Bin Ein Europeaner!
JOIN TEAM Snake Oil
Head-Fi Feedback<<>> ebay Feedback<<>> Pink Noise Burn-In Tool!!
I Changed My Windows Desktop to a PIC of the Audio-GD REF 1
Witness the Birth of the Phoenix Phoenix
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05-09-2009, 09:21 PM
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Head-Fi'er
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Join Date: Feb 2009
Location: Germany
Posts: 62
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Amnesia or didn't you try? 
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05-09-2009, 10:43 PM
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Headphoneus Supremus
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Join Date: Nov 2008
Location: S. FLorida
Posts: 3,183
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Quote:
Originally Posted by op2003
Amnesia or didn't you try? |
I listen to stuff pretty loud normally. I had a LD MKV and was able to max it out. It always seemed to have a low gain level. I never felt the Zero was anemic with any canz.
.
__________________
<<<Les Garten>>> Leave the gun, take the cannoli -- Fat Clemenza circa 1950
Conversation with future Nobel Prize winner Doris Lessing in 1969: Lessing: "You do still have gangsters [in Chicago], don't you?" Studs Terkel: "Yes, but these days they're mostly in business, or politics."
"We hang the petty thieves and appoint the great ones to public office" Aesop
Ich Bin Ein Europeaner!
JOIN TEAM Snake Oil
Head-Fi Feedback<<>> ebay Feedback<<>> Pink Noise Burn-In Tool!!
I Changed My Windows Desktop to a PIC of the Audio-GD REF 1
Witness the Birth of the Phoenix Phoenix
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05-28-2009, 01:51 AM
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100+ Head-Fi'er
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Join Date: Apr 2009
Location: Toowoomba, Ozland
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I tried searching for an answer but couldn't find one. My zero blew up in a pile of smoke yesterday afternoon. I fried the transformer it appears (before the fuse popped). The outer plastic on the trasformer was burning up and the area around the toroid got really, really hot.
Is it likely to just be the transfomer or is anything downstream going to be dead. What are the voltages of the torroid and where can I get a replacement. Cheers guys.
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Phones: Allesandro Woodied MS1000's
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Gone: Zero DAC with OPA627 and LT1364's (blown the f*** up)
Coming: Compass DAC
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