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  1. Anonanimal

    So, the Objective2 headphone amp - designed entirely around the measurements? (PLEASE READ RULES BEFORE POSTING)

    Quote: Yeah I suppose- it's just that it seems there is always a question about gain from someone and the advice is always something anecdotal and often the source (DAC) isn't even cited.  I may take all this info and see if I can create something useful w/ it for people new to DIY and...
  2. Anonanimal

    So, the Objective2 headphone amp - designed entirely around the measurements? (PLEASE READ RULES BEFORE POSTING)

    Quote: That's interesting.  Any idea what the relative dB difference is between those 'quiet' albums and louder albums at the same volume pot setting?  I think if we could come up with a reasonable range of 'headroom' needed for various recording levels, we could come up with some solid...
  3. Anonanimal

    So, the Objective2 headphone amp - designed entirely around the measurements? (PLEASE READ RULES BEFORE POSTING)

    Quote: I think you'd actually be fine for anything but a seriously variable collection.  The K702 is rated at 105dB/V, which translates into ~93 dB/mW efficiency @62 Ohms.  Based on your source you should only need a gain of 2-3 to get 115dB+ peak volume on normalized recordings.  How...
  4. Anonanimal

    So, the Objective2 headphone amp - designed entirely around the measurements? (PLEASE READ RULES BEFORE POSTING)

    Quote: Thanks for the input, all.  Will revisit the questionable numbers.   Edit:   Okay I've revisited all of the numbers and corrected the sensitivities that were originally 1dB/V.  I have added a calculator to the spreadsheet to do that.   Nikongod- actually the gain...
  5. Anonanimal

    So, the Objective2 headphone amp - designed entirely around the measurements? (PLEASE READ RULES BEFORE POSTING)

    Quote: I can do that if there's interest.  It's a series of pretty simple calculations but I've got them packed in a table for quick reference.
  6. Anonanimal

    So, the Objective2 headphone amp - designed entirely around the measurements? (PLEASE READ RULES BEFORE POSTING)

    Quote: Sure.  I've upped the dB requirement to 115 for some additional headroom for quieter recordings.  In practice I've found this to be enough, but again YMMV.   I'd attach the .xls file instead of posting screenshots but I seem to have been denied that ability.  Sorry!  
  7. Anonanimal

    So, the Objective2 headphone amp - designed entirely around the measurements? (PLEASE READ RULES BEFORE POSTING)

    Quote:   Quote: Where is your data showing that the amp does not, by spec, have enough output to properly drive the quoted headphones?   Actual power specs: 6.25 volts RMS on AC power at < 1% THD into 150 ohms 4.5 volts RMS on DC power at < 1% THD into 150 ohms...
  8. Anonanimal

    So, the Objective2 headphone amp - designed entirely around the measurements? (PLEASE READ RULES BEFORE POSTING)

    Quote: Fair enough.  I don't want to come across like I'm overreacting, was just trying to provide a parallel and it's a bit half-baked.
  9. Anonanimal

    So, the Objective2 headphone amp - designed entirely around the measurements? (PLEASE READ RULES BEFORE POSTING)

    Hold on a second here- I'm a bit confused at the overall tone from the vets here.  Bear with me, please.   So the limitations of the input stage are being touted as a "major problem" for the DIY crowd because it requires some forethought and building the amp such that the gain is correct for...
  10. Anonanimal

    So, the Objective2 headphone amp - designed entirely around the measurements? (PLEASE READ RULES BEFORE POSTING)

    Quote: I'm also interested to see this.  Did some quick searching (here and Google) and couldn't really dig anything up.  
  11. Anonanimal

    HD650 Mint Condition / All Original Cables + Boxes Included [SOLD]

    This is the newer silver driver version, purchased New in July 2009.
  12. Anonanimal

    HD650 Mint Condition / All Original Cables + Boxes Included [SOLD]

    Like-new condition HD650 with stock cable, adapter and original boxes (inner and outer box).   Headband exhibits none of the typical paint chipping/cracking that you normally see on used ones.  Approximately 400 hours on clean amplification only, and never played to the point of distortion. ...
  13. Anonanimal

    Roll Call: Who's building, built, or thinking of building a beta22?

    Great to hear that it's up and running!  Enjoy your new amp- over a year after building mine I rarely go a day without listening to it...
  14. Anonanimal

    Roll Call: Who's building, built, or thinking of building a beta22?

    Quote: You can (and I did as well).  What I was stressing earlier is that they are definitely not required, though some were giving Chrono the idea that they were.  Either way, that wasn't his problem so we can move on.
  15. Anonanimal

    Roll Call: Who's building, built, or thinking of building a beta22?

    Good to hear that there are no issues there.  Check out the Troubleshooting section of the Initial Setup page on amb's site for a good start on what to check.   Other than that, one of the first things I'd check is the orientation of your trimpots.  I've seen a number of blown boards on the...
  16. Anonanimal

    Roll Call: Who's building, built, or thinking of building a beta22?

    Quote:   That's what I was referring to as well in my very first sentence.  Sorry for any confusion, but I was in fact answering your original question.  I was simply expanding on my answer with the other info because some of the previous posts suggested you had done something horribly...
  17. Anonanimal

    Roll Call: Who's building, built, or thinking of building a beta22?

    Quote: The pads are isolated.  When in doubt, break out the multi-meter!  What you need to worry about, and amb describes this very clearly on the site (for the others saying this is taboo), is if the heat sinks are in very close proximity to the enclosure when installed.  If so, then...
  18. Anonanimal

    Beyerdynamic to launch new top headphone at IFA -- called T1

    Quote: People can find my opinion on the quality of the Furutech plug just a few posts back... maybe I'm just unlucky.   majkel- If I'm correct here, are you suggesting that floating the shield on the ~10foot cable is an improvement?  I'm finding that pretty difficult to swallow.  ...
  19. Anonanimal

    Beyerdynamic to launch new top headphone at IFA -- called T1

    Quote: I did because I had one sitting around and was bored.  Of course there was no discernible difference in sound, but the Furutech looked nicer for a while- and I prefer how it fits in the jack of my B22 vs the Neutrik the headphones came with.  Now that a few months have gone by...
  20. Anonanimal

    beyerdynamic T5p: Photos and first impressions.

    Interesting remarks guys, keep it up.  It's too bad if this is true, considering how well Beyer did on the T1.  I love the T1 and would definitely be in the market for a sealed version with a similar signature...
  21. Anonanimal

    Mistakes you made with your β22 or σ22

    My Beyer T1s caused my 3-ch gain8 Beta to oscillate at low volumes only.   Based on some advice from amb and others I ordered the parts for a zobel, but since I also wanted to reduce the gain anyway- also ordered the parts to try 5x and 2x gains.   Started with 2x gain and no zobel...
  22. Anonanimal

    Carrie USB-Powered Headphone Amplifier

    It's the identical Hammond case that the Mini^3 uses, and they fit almost perfectly.  This is what they were designed to do.  You can find pictures of my builds on the previous page in this thread I believe.   I used the BantamDAC for my two Carries and I do not have a single complaint on...
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