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| Headphone Amps (full-size) Discussion of desktop headphone amps. |
12-05-2008, 02:40 PM
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500+ Head-Fi'er
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Join Date: Oct 2008
Location: Tbilisi - Georgia
Posts: 937
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Quote:
Originally Posted by Currawong
Penchum did in his review. Check the very first post.  |
That page I know by heart!! but I think he had written about combinations with 627 on the DAC, but since I have 2 spare 627 on browdogs, courtesy wsz, as he sent me a full replacement boards with opamps, and with my moon HDAM from GD Audio on the way, I was wondering how the 627s would sound on the amp section, currently I have LM4562s...
PS. good to see your Lavry gone before Christmas..
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12-05-2008, 04:15 PM
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Junior Head-Fi'er
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Join Date: Nov 2008
Posts: 9
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Re the hum issue, I don't hear it from the speakers or 'phones, but the machine itself does have slight audible hum from about 4 feet away. It should be dead silent, right? Strange thing is, I think it was silent out of the box, but one day I happened to notice it, before reading about the problem here. Mine's from wsz.
Thanks.
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12-05-2008, 05:16 PM
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Headphoneus Supremus
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Join Date: Nov 2008
Location: S. FLorida
Posts: 3,262
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Could one of you Electronics Guru's explain how a transformer can make a Mechanical vibration? I don't understand how that happens. It does, I just don't get 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
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12-05-2008, 05:26 PM
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100+ Head-Fi'er
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Join Date: Jul 2008
Location: Porto, Portugal
Posts: 439
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Quote:
Originally Posted by les_garten
Could one of you Electronics Guru's explain how a transformer can make a Mechanical vibration? I don't understand how that happens. It does, I just don't get it.
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Transformer Noise Chapter 1 (Causes are addressed from Chapter 2 onwards)
__________________
PC (WASAPI) → AMB/Mr.X γ1 (W.I.P) → Pure Silver m-RCA D.I.Y → Millett Hybrid MiniMAX D.I.Y (W.I.P) / AMB Mini³ D.I.Y → Sennheiser HD-650 / Grado RS-80
Last edited by DaMnEd; 12-05-2008 at 05:30 PM.
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12-05-2008, 05:39 PM
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500+ Head-Fi'er
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Join Date: Jan 2007
Location: NY, NY
Posts: 565
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Quote:
Originally Posted by sandchak
That page I know by heart!! but I think he had written about combinations with 627 on the DAC, but since I have 2 spare 627 on browdogs, courtesy wsz, as he sent me a full replacement boards with opamps, and with my moon HDAM from GD Audio on the way, I was wondering how the 627s would sound on the amp section, currently I have LM4562s...
PS. good to see your Lavry gone before Christmas..
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Not sure where it is exactly in the thread, but yes, Pench (and others) tried the 627 in the amp section with less than stellar results - but hey - if you have them why not just try for yourself? Noone knows better than your own ears!
__________________
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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12-05-2008, 05:43 PM
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Headphoneus Supremus
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Join Date: Nov 2008
Location: S. FLorida
Posts: 3,262
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Quote:
Originally Posted by DaMnEd
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Good article, it's a wonder any of them are quiet!
__________________
<<<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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12-05-2008, 06:04 PM
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500+ Head-Fi'er
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Join Date: Jul 2008
Location: Hull, UK
Posts: 822
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100 watts is enough.
Why doesn't it have a power selector to switch between 110-220volts?
__________________
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12-05-2008, 06:07 PM
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100+ Head-Fi'er
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Join Date: Jul 2008
Location: Porto, Portugal
Posts: 439
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Quote:
Originally Posted by jujulio
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Actually the ZERO has "the switch" 110v-220v, mine certainly did, so you can use this unit worldwide without any power converter, you just have to flip the switch and use the proper cable for the country, and be careful, make sure you have the right setting before you turn on the unit.
Have a look: tianyun100.com
__________________
PC (WASAPI) → AMB/Mr.X γ1 (W.I.P) → Pure Silver m-RCA D.I.Y → Millett Hybrid MiniMAX D.I.Y (W.I.P) / AMB Mini³ D.I.Y → Sennheiser HD-650 / Grado RS-80
Last edited by DaMnEd; 12-05-2008 at 06:11 PM.
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12-05-2008, 06:09 PM
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100+ Head-Fi'er
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Join Date: Apr 2008
Posts: 111
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really? strange, the ebay dealer specifically ask you to decide between the two options....its the upgraded option with the opa627...maybe its not available anymore....kinda suckx if that's the case
i guess i'll ask the dealer
thank you for your replies
edit: http://cgi.ebay.com/ws/eBayISAPI.dll...ayphotohosting
you can see there is no longer a switch 
i guess a power converter will not give a quite 'steady' current, which may alter the sound a bit, but i don' want to invest in a more refined converter
Last edited by jujulio; 12-05-2008 at 06:18 PM.
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12-05-2008, 06:14 PM
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100+ Head-Fi'er
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Join Date: Jul 2008
Location: Porto, Portugal
Posts: 439
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I had a look on ebay, and wsz0304 (and probably others) from the pictures sells a version that does not have this capability.
I purchased mine from audiophilechina, and mine did have the switch like the one you see in the manufacturer website.
Anyway, audiophilechina asks the same question, but only to make sure they send you the unit with the right setting and avoid you blowing up the unit, because many would not care to check it and would just leave it as the manufacturer ships.
Ask your ebay seller if the version they sell has the switch, the pictures may be from an older (or newer) version that would not have this capability.
__________________
PC (WASAPI) → AMB/Mr.X γ1 (W.I.P) → Pure Silver m-RCA D.I.Y → Millett Hybrid MiniMAX D.I.Y (W.I.P) / AMB Mini³ D.I.Y → Sennheiser HD-650 / Grado RS-80
Last edited by DaMnEd; 12-05-2008 at 06:18 PM.
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12-05-2008, 06:22 PM
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100+ Head-Fi'er
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Join Date: Apr 2008
Posts: 111
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mhhh ok that makes sense, what if they send me an 'old' unit? Do they just differ in regard of this switch, or is the build different? (the seller advertises it as an upgraded version so i find it surprising if they would send 'old' version with the opa627)
by the way thanks for quoting audiophile china, i didn't know about it, maybe it's a cheaper solution for me, i'll check the shipping fares....though it's not the opa627, do you know if they allow you to chose an 'upgraded version'?
thanks
Last edited by jujulio; 12-05-2008 at 06:26 PM.
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12-05-2008, 06:30 PM
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100+ Head-Fi'er
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Join Date: Jul 2008
Location: Porto, Portugal
Posts: 439
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Some changes have been made regarding the enclosure (added vent bars) but I am unaware of other changes, most sellers sell the opa627 "upgraded" but they do the change themselves, not the manufacturer as far as I know (this may have changed since the opa627 became the popular choice).
The manufacturer may have changed the transformer to one that is not capable of dual primary voltage, this change may or may not have been a result of some problems with "humm" reported here and elsewhere.
I had the version with switch and had no Hum problems, but... you never know, better to ask and confirm.
As far as I know audiophilechina does not provide a version with the OPA627, but you can always ask, still, you can get the OPA627 elsewhere and upgrade the unit yourself, or maybe go for the better option, an Audio-GD HDAM, it is a very simple thing to do, remove one, place another.
__________________
PC (WASAPI) → AMB/Mr.X γ1 (W.I.P) → Pure Silver m-RCA D.I.Y → Millett Hybrid MiniMAX D.I.Y (W.I.P) / AMB Mini³ D.I.Y → Sennheiser HD-650 / Grado RS-80
Last edited by DaMnEd; 12-05-2008 at 06:36 PM.
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12-05-2008, 06:36 PM
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100+ Head-Fi'er
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Join Date: Apr 2008
Posts: 111
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So choosing a version which doesn't allow to switch would be a safe choice regarding the humming? Maybe it's because the power supply is solely designed for a dedicated current which enhances a steady signal? (i looked a bit in the previous article posted regarding the humming and electro-magnetical noise due to alternative current, though i wonder if i would be able to hear it, even with my HD650, i mean i am not sure to have golden ears lol) btw, if any of you know of a way to test your audition, i'll be interested, like a web based test maybe?
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12-05-2008, 06:40 PM
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100+ Head-Fi'er
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Join Date: Jul 2008
Location: Porto, Portugal
Posts: 439
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If such a change was really put in affect with the newer versions, yes, I suspect that would be the reason, but I do not know this for a fact, only the manufacturer (or the seller because he probably was informed by manufacturer as to why) would be able to confirm.
__________________
PC (WASAPI) → AMB/Mr.X γ1 (W.I.P) → Pure Silver m-RCA D.I.Y → Millett Hybrid MiniMAX D.I.Y (W.I.P) / AMB Mini³ D.I.Y → Sennheiser HD-650 / Grado RS-80
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