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  1. unbiased

    Review: ZERO 24 BIT/192KHz DAC/Headphone Amp/Pre-Amp

    My original Zero DAC headphone amp also just stopped working out of the clear blue recently.  Does anyone have a schematic for it?  I suspect it is the DAC board and not the power amp board because I can hear the hum from each channel through the headphones as I touch and probe the audio IC chip...
  2. unbiased

    New 24/192 dac from china-nice!

    Hey it's now 05/17/2015 as I reminisced through these headphone forums... and see, yep, everyone went to sleep on this thread and never answered. I don't remember what had transpired exactly between then and now but all I know is that I have a Zhalou DAC headphone amp in my collection that I...
  3. unbiased

    High End Bluetooth Headphones

    I agree with much of your points however, I have no issue with the AZIO or Supertech CSR USB 4.0 AptX enabled dongles.  They work perfectly fine for me for streaming AptX to my Bluetooth headphones and receivers.  I have now both the Avantree Priva (bought it again cheaper on eBay)  and I have...
  4. unbiased

    Possibly fake Sony 7509HD - but how do I tell?

    Okay, thanks for confirming that some were made in China. I was concerned because I had read that folks with original Sony's had "Made in Thailand" on the underside of their headband.  I guess they started manufacturing them out of various locations. Maybe the ones made in China sound worse than...
  5. unbiased

    Possibly fake Sony 7509HD - but how do I tell?

    Hi , wow! So you are saying that the ones I have and have shown here are the real Sonys? Then I can't vouch for everyone raving about the sound quality out of them. Mine sound like crap from day one to now 8 years later when all the materials in them should have settled out and mellowed out. ...
  6. unbiased

    Possibly fake Sony 7509HD - but how do I tell?

    Here are a few more pictures of my particular set of Sony MDR-7509HD headphones with "Made in China" stamped underside the headband purchased in year 2007 on amazon.com... Are they like the real Sony's or are they fake?! I think these are fake ones since the sound is terrible out of them.  But...
  7. unbiased

    Possibly fake Sony 7509HD - but how do I tell?

    Reviving this thread since I just discovered that the Sony MDR-7590HD headphones I bought off of amazon.com back in 2007 probably are fakes. I always wondered why they sounded like pure crap when there were so many rave reviews for their sound.  I was so disappointed in them that I threw them...
  8. unbiased

    Sony MDR-1R series MK2

    I agree with this assessment of the MDR1RBTMK2.  They do have a mild mid bass hump both wired and Bluetooth mode.  They are not lacking in bass presentation.  They present overall a very well balanced sound from highs to lows.  They are detailed without being harsh in any part of the spectrum. ...
  9. unbiased

    Sony MDR-1R series MK2

    Hi, my battery had a good charge on it too out of the box so that might not be a tell tale sign.  The battery on this headphone lasts a long time. It's pretty good.  If there is nothing wrong with it, you might as well keep it.  My MDR-1RBTMK2 turned out to be great well balanced Bluetooth...
  10. unbiased

    Sony MDR-1R series MK2

    I bought my pair from amazon.com too but paid $295 for them. They've then dropped the price down to $285 right after I bought them and then upped the price again to $288 I see. Anyway, I got what seemed to be a brand new one and my box outer sleeve cover does not have extra stickers stuck over...
  11. unbiased

    What are head-fi members views on apt-x lossless codec (over bluetooth)?

    Hello Class D, yes I am aware of all the settings modes and yes the Sony MDR1RBTMK2 is exactly the same as your MDR10RBT setup.  I also just received my other pair of Sony MDRXB950BT today (from Japan) and they are configured exactly the same way using the power on/off button and the Volume...
  12. unbiased

    High End Bluetooth Headphones

    Yes, I have already fired off my issue conerns to both Avantree and Miccus. Let's see how they respond.
  13. unbiased

    Koss KSC-35 back at Koss.com

    Quote: Oh, I just noticed that this thread's title probably answers my question of when they re-released it~! duh~!  I guess back in 2006 they did.  Wow, I only just now in 2011 was browsing around for new earphones and visited the Koss site and saw it.  I only stumbled upon the middle of...
  14. unbiased

    Koss KSC-35 back at Koss.com

    Hello, wow sorry if I am not supposed to revive an old thread like this, but way back so many years ago from 2001 timeframe I bought the Koss KSC-35's and they turned out to be the finest sounding clip-on ear phones you could buy.  I later bought the newer cheaper cost KSC-75's too (two pairs...
  15. unbiased

    K701 - The nicest phones I've hated

    Quote: Originally Posted by dmcs414 I can tell you that from my experience, the amp in the 0404 is absolutely pitiful driving my Denon D2000s. I can't even fathom how bad it would be driving the K701s, a headphone that is known to be harder to drive than mine. For gods sake man, get a...
  16. unbiased

    The "mod your Zhalou" Thread

    Quote: Originally Posted by udo Any knowledge about a NAD C320BEE being capacitor coupled? All of these NAD vintage preamps/amps were pretty much the same I believe. They all used the same or similar preamp circuit design and thus it is capacitor coupled. You should be able to...
  17. unbiased

    ZERO 24/192 DAC, Anyone heard of this DAC amp?

    Quote: Originally Posted by dude809 If only this thing had USB as well, it would be near perfect. You could still always use one of those separate usb to spdif adapters that sell for aroun $15 to $20. I don't know what chip is used in those standalone products but venture to...
  18. unbiased

    New Portable Amp/Dac: iBasso D1 **with updates on the first page**

    Quote: Originally Posted by willisv I think the general rule for bypassing caps is 1/100 of higher value... somebody correct me if i'm wrong. In all my years of electronics experience and designing highend speaker systems and crossover networks and tweaking tube and solid state...
  19. unbiased

    New Portable Amp/Dac: iBasso D1 **with updates on the first page**

    Quote: Originally Posted by Ranma13 Quick question: does anybody know the difference between NSOIC and SOIC? I'm trying to get the AD825 from Newark.com, but the SOIC version is no longer available: http://www.newark.com/jsp/search/bro...Ntt=AD825&Ntx= Ranma13 you should be...
  20. unbiased

    AudioXpress articles on Adcom 565 mods by Gary Galo?

    Quote: Originally Posted by pjr300 Does anyone have any insight on a series of articles by Gary Galo which ran in AudioXpress? The series covered mods on the Adome GTP-565 preamp. Has anyone heard it? Is the effort worthwhile? is there a sumamry of the articles somewhere on the web...
  21. unbiased

    New Portable Amp/Dac: iBasso D1 **with updates on the first page**

    Quote: Originally Posted by Ranma13 I've got some really bad sibilance with my Grado SR-225 using the OPA2111, AD8656, and LM4562. Which op amps would be a good replacement for these that will reduce the sibilance and/or synergize with a RS-1? So far in my experience, I find that...
  22. unbiased

    Whos waiting for the ibasso d1.?

    Quote: Originally Posted by jerikl Just wanted to say I'm enjoying the D1, letting it burn-in, and trying to wait until the 200 hour mark to do some in-depth reviews. What a versatile little unit. I'm not that patient when it comes to this sort of waiting, so I started rolling...
  23. unbiased

    Meier Aria or iBasso D1 for HD600??

    Quote: Originally Posted by mrarroyo If you are going to be stationary while using your laptop then go w/ the home amp/dac. If you will be moving the iBasso D1 would be a better choice specially w/ different op-amps. Another option would be the Leckerton Audio UHA-3, which is...
  24. unbiased

    XM4 Reborn!

    Quote: Originally Posted by mrarroyo I went to Analog Devices website and if I am reading the specs correctly the AD823 provides 15 mA of current versus 45 mA of current in the AD8620. I hope others can verify this information. From what I understand about the AD823 is that it is...
  25. unbiased

    New Portable Amp/Dac: iBasso D1 **with updates on the first page**

    Quote: Originally Posted by HiFlight It is the LT6234 ....I did suggest to iBasso that they try that opamp in the buffer. Apparently they are able to source those opamps. Much better than AD8616. iBasso is very receptive to input from their customers. (Got all my op amp orders...
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