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| Headphone Amps (full-size) Discussion of desktop headphone amps. |
05-28-2009, 02:35 AM
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Headphoneus Supremus
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Join Date: Nov 2008
Location: S. FLorida
Posts: 3,266
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Quote:
Originally Posted by Mitchell.lax
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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Peete may know what the specs on the transfo are. Maybe someone here has some parts. You may find the specs on the Transfo written on it areound the side of the Toroid. Seems like if all that happened you may have some "Small Toast" elsewhere. Look over all the components with a mag glass to see if anything else burned.
Zero thread is always good for a little entertainment!
.
__________________
<<<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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05-28-2009, 09:03 AM
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Headphoneus Supremus
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Join Date: Feb 2008
Location: GreaterTorontoArea in Sub-Urbaine hell
Posts: 3,113
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I think the trannie is a dual primary (115 + 115V) with 20-0-20, 9 + 9 V (or 12 + 12V ) secondaries with a rating of 100VA.
Give Lawrence Chan a shout via email or Snow. Either one of those guys should be able to get you one. See Curra's FAQ page for email details (of it's still listed).
Peete.
__________________
Cans :HD650, AKG 240M (HD650 DIY cables SE and Balanced)
Desktop amps : LD MK III (6H30P-i DR's + DIY mods, Jaycar DIY kit amp (major DIY mods), 2 X Audio-gd Compass (test prototype,final version), Audio-gd C-2C W/ Stepped pot Upgrade, Audio-gd Phoenix SS balanced preamp/headamp.
Transports: Auzen Prelude PCI 7.1 SC/ASIO native driver using Media Monkey (all EAC ripped FLAC/Wav), Vanguard CDM12 Pro (BNC mod), HK HD720 (completely upgraded), Audio-gd CD7 Transport.
Sources: FrankenDAC DIY 24/192 dac (HDAMs/Teflon/PIO cap mod), Compass DAC, See Corp Vintage UK TT(Mission arm/Ortofon OM20S MM cart), Yaqin MS12B tube phono preamp, TEAC V530X Tape deck, Audio-gd Reference 1 DAC. C2C DIY pot mod http://www.head-fi.org/forums/f6/ste...1/#post5846722
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06-03-2009, 10:06 PM
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Head-Fi'er
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Join Date: Jul 2008
Posts: 55
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192K decoding
Has anyone tried feeding Zero 192K/24bit signal? Every time I tried it w/ SRC, Zero gave me random static and popping sound. 96K worked perfectly though. My sound card is AP192 and I'm using Bluejeans digital audio interconnect to feed SPDIF into Zero. Is it my Zero, or reset of the system?
Last edited by x_lk; 06-03-2009 at 10:10 PM.
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06-03-2009, 11:05 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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Are you using optical spdif? I'm pretty sure only coax can do 192
__________________
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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06-04-2009, 12:24 AM
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Head-Fi'er
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Join Date: Jul 2008
Posts: 55
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Quote:
Originally Posted by ScottieB
Are you using optical spdif? I'm pretty sure only coax can do 192
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Coax. AP192 does not have optical.
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06-04-2009, 01:16 AM
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Headphoneus Supremus
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Join Date: Jan 2008
Location: Fukuoka, Japan (was Australia)
Posts: 3,630
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More to the point, is there any benefit in feeding the Zero a 192k signal? The only benefit is a measuredly imperceptibly lower noise floor.
__________________
MacBook Pro → Audio-gd Reference 3+1 → Phoenix → Sennheiser HD-800, Grado HF-2, Symphones Magnums or Parasound Zamp → Paradigm Titans + Van Den Hul or DIY cabling.
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06-04-2009, 05:55 AM
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Head-Fi'er
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Join Date: Jul 2008
Posts: 55
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Quote:
Originally Posted by Currawong
More to the point, is there any benefit in feeding the Zero a 192k signal? The only benefit is a measuredly imperceptibly lower noise floor.
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I think the benefit of upsampling is more on the final anti-imaging filter stage. Virtually every CDP/DAC nowadays upsamples. AD1852 used by Zero is a Delta-Sigma modulation DAC. The DAC chip 8x upsamples a 44.1K signal before feeding it to Delta-Sigma Modulator, in order to avoid the need for a sharp analog low-pass filter. And this is where I got confused, since the DAC itself upsamples, then why external upsampling is ever needed? DAC-1 uses AD1853 and actually upsamples everything to 110K. They claim upsampling provides '20dB filter-performance improvement'. Is it because the SRC they use better than the AD1853 internal interpolator? I don't know, but would like to experiment and see if there is actually audible differences  Plus, I happen to have a DVD-Audio disc w/ 192K/24bit tracks.
BTW, I can't tell the differences between the original 44.1K and the upsampled 88.2K/96K on my system. Maybe my system is not good enough 
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06-09-2009, 04:48 AM
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100+ Head-Fi'er
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Join Date: Dec 2008
Location: Singapore
Posts: 196
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Anyone know what is the voltage socket for zero+? also the voltage for the h/amp socket?
__________________
CalvinCool
Headphone : Denon AH-D5000 (Mod/Balanced/JMoney Earpad), AKG K702, AKG K319, Sony MDR-EX90SL, UE triple.fi 10vi, Westone UM3X
Amp: Denon AV1909, Zero+, RSA P-51, iBasso D10, Audio-gd Phoenix
Speaker: B&W685 with Chord Rumour 4 bi-amp
Cable: Chord Company Crimson, iChord, QED J2P, Crossroads copper/silver cable
Player: Ipod Nano 1G, PC, iPhone 3G
Sold: SuperFi 5Pro, Little Country III
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06-09-2009, 06:00 AM
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Headphoneus Supremus
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Join Date: Feb 2008
Location: GreaterTorontoArea in Sub-Urbaine hell
Posts: 3,113
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The AD1852 oversamples and does not upsample. Most DACs and CDP's do not upsample.
Peete.
__________________
Cans :HD650, AKG 240M (HD650 DIY cables SE and Balanced)
Desktop amps : LD MK III (6H30P-i DR's + DIY mods, Jaycar DIY kit amp (major DIY mods), 2 X Audio-gd Compass (test prototype,final version), Audio-gd C-2C W/ Stepped pot Upgrade, Audio-gd Phoenix SS balanced preamp/headamp.
Transports: Auzen Prelude PCI 7.1 SC/ASIO native driver using Media Monkey (all EAC ripped FLAC/Wav), Vanguard CDM12 Pro (BNC mod), HK HD720 (completely upgraded), Audio-gd CD7 Transport.
Sources: FrankenDAC DIY 24/192 dac (HDAMs/Teflon/PIO cap mod), Compass DAC, See Corp Vintage UK TT(Mission arm/Ortofon OM20S MM cart), Yaqin MS12B tube phono preamp, TEAC V530X Tape deck, Audio-gd Reference 1 DAC. C2C DIY pot mod http://www.head-fi.org/forums/f6/ste...1/#post5846722
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06-09-2009, 07:34 AM
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Head-Fi'er
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Join Date: Jul 2008
Posts: 55
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Quote:
Originally Posted by Pricklely Peete
The AD1852 oversamples and does not upsample. Most DACs and CDP's do not upsample.
Peete.
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I admire you, Peete, but can't agree with you on this one. In data sheet of AD1852, 'interpolation' is used as synonyms referring the upsampling process. Oversampling does serve the same purpose, but it has to happen at the ADC stage. Since tracks on CD have a fixed sampling rate of 44.1K, how can you oversample already sampled signals? Besides AD1852/53, both CS43XX and AK43XX use similar 8x interpolators internally.
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06-09-2009, 08:04 AM
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1000+ Head-Fi'er
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Join Date: Jun 2008
Location: In my own little world beneath the sea (aka The Netherlands)
Posts: 1,088
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Quote:
Originally Posted by x_lk
I admire you, Peete, but can't agree with you on this one. In data sheet of AD1852, 'interpolation' is used as synonyms referring the upsampling process. Oversampling does serve the same purpose, but it has to happen at the ADC stage. Since tracks on CD have a fixed sampling rate of 44.1K, how can you oversample already sampled signals? Besides AD1852/53, both CS43XX and AK43XX use similar 8x interpolators internally.
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I think we're getting bogged down in badly understood terminology.
Upsampling vs. Oversampling
Lavry Engineering: Sampling
__________________
I don't take myself seriously at all, so neither should you.
"The light at the end of the tunnel is often an oncoming train."Terry Pratchett (originally Robert Lowell)
"I don't know what placebo is because I have never had it, how do I get it?"Patrick82 <Gear is in Profile>
Tiny bit of feedback
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06-10-2009, 06:59 PM
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Junior Head-Fi'er
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Join Date: Nov 2008
Posts: 9
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Hey there.
Do you think it's ok to place the zero on it's side, kind of like the way the dac magic can? (I've got space constraints) I would build some kind of base for it, like the dac magic. & if it's ok, which way up do you think it should go, ie, headphone jack near the top or the bottom? (I haven't done any mods to it, so nothing's flapping around in there (hopefully!))
Thanks. By the way, mine's been working fine since day 1 (bought from wsz last year some time)...just a little bit of hum that you have to get close to to hear.
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06-10-2009, 08:18 PM
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Headphoneus Supremus
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Join Date: Feb 2008
Location: GreaterTorontoArea in Sub-Urbaine hell
Posts: 3,113
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Thanks for the links Dro !!
I think that settles the differences rather plainly.
Peete.
__________________
Cans :HD650, AKG 240M (HD650 DIY cables SE and Balanced)
Desktop amps : LD MK III (6H30P-i DR's + DIY mods, Jaycar DIY kit amp (major DIY mods), 2 X Audio-gd Compass (test prototype,final version), Audio-gd C-2C W/ Stepped pot Upgrade, Audio-gd Phoenix SS balanced preamp/headamp.
Transports: Auzen Prelude PCI 7.1 SC/ASIO native driver using Media Monkey (all EAC ripped FLAC/Wav), Vanguard CDM12 Pro (BNC mod), HK HD720 (completely upgraded), Audio-gd CD7 Transport.
Sources: FrankenDAC DIY 24/192 dac (HDAMs/Teflon/PIO cap mod), Compass DAC, See Corp Vintage UK TT(Mission arm/Ortofon OM20S MM cart), Yaqin MS12B tube phono preamp, TEAC V530X Tape deck, Audio-gd Reference 1 DAC. C2C DIY pot mod http://www.head-fi.org/forums/f6/ste...1/#post5846722
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06-10-2009, 10:43 PM
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Headphoneus Supremus
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Join Date: Apr 2005
Location: Markham/Waterloo, ON
Posts: 2,204
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Going back and forth on the Zero and my friend's Theta DS Pro prime, and the Zero (w/ the OPA-Earth in it) is definitely sounding harsher than the Theta. The Theta in comparison is smooth and flowing, while the Zero has an edge to the music. I'm guessing the OPA-Moon would help out in that regard? The Sun was murder on the ears with the MS-2is, so I'm leaving it far far away from the Zero.
__________________
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Portable: Apple iPod Touch 2G 16GB > Westone UM2, AKG K518 LE, Sennheiser PX100, Apple Premium In-Ears
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06-10-2009, 11:20 PM
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Headphoneus Supremus
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Join Date: Nov 2008
Location: S. FLorida
Posts: 3,266
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Quote:
Originally Posted by azncookiecutter
Going back and forth on the Zero and my friend's Theta DS Pro prime, and the Zero (w/ the OPA-Earth in it) is definitely sounding harsher than the Theta. The Theta in comparison is smooth and flowing, while the Zero has an edge to the music. I'm guessing the OPA-Moon would help out in that regard? The Sun was murder on the ears with the MS-2is, so I'm leaving it far far away from the Zero.
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Would be interesting to hear the Theta up against the Audio-GD REF1, that would be fun!
.
__________________
<<<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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