atomicbob
Last Activity:
Mar 26, 2024 at 9:18 PM
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Gender:
Male
Location:
On planet
Occupation:
acoustic research scientist

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atomicbob

dScope Yoda, Male, from On planet

Pyrate BWC MZR

Beginning the journey into the next stage of my life cycle. Over 100 ultrasound images taken of my heart and cardiovascular system. Mar 18, 2024

atomicbob was last seen:
Mar 26, 2024 at 9:18 PM
    1. atomicbob
      atomicbob
      Beginning 2018 feeling Thick as a Brick. CRS interfering with what measurements have / haven't been made or posted. Back to Tull for awhile.
      1. Ringingears likes this.
      2. Dino
        Dino
        Make sure to listen to every song in the correct order. :)
        Jan 3, 2018
        Ringingears and atomicbob like this.
    2. atomicbob
    3. atomicbob
      atomicbob
      Data quality vetting done. Putting together outline now. There will be additional graphs given some interesting attributes of the ZDT Jr.
      1. obsiCO, jexby, Dr. Higgs and 6 others like this.
      2. Ringingears
        Ringingears
        Thanks for doing the measurements. Really curious to see what you found.
        Dec 17, 2017
    4. atomicbob
      atomicbob
      Shit! that feeling you get when realizing an afternoon of measurements have been shot to hell ....
      1. atomicbob
        atomicbob
        because the 30R measurements were made with the plug in the High impedance jack. Will have to redo all those measurements after dinner.
        Dec 16, 2017
      2. jowls
        jowls
        Ugh. I can’t imagine the amount of time it takes for such comprehensive measurements, as you consistently provide. Thanks again.
        Dec 16, 2017
      3. atomicbob
        atomicbob
        Data quality vetting done. Putting together the outline now. There will be additional graphs given some interesting attributes of the ZDT Jr.
        Dec 17, 2017
        jowls likes this.
    5. atomicbob
      atomicbob
      ZDT Jr 300R measurements in the can today. Tomorrow will be 30R measurements and pictures. Maybe some data posted on Sunday.
      1. gaspasser, Vansen and dmckean44 like this.
    6. atomicbob
      atomicbob
      So here I have some very expensive and great sounding headphone amps, but what am I drawn to this evening?
      1. View previous comments...
      2. FlySweep
        FlySweep
        Big BIG fan of the SB'ed Crack w/ the Tungsram E80CC. I wish I heard one that was specifically biased for that tube.. cause even non-optimized for it, it was terrific. Amperex 5085 is indeed dope.. might still have it in my tube stash.. will send it to you @atomicbob if I find it. Tungsram's 12AU7 is a fav in the Crack for me, as well.
        Dec 2, 2017
        atomicbob likes this.
      3. Melvillian
        Melvillian
        Dec 3, 2017
        FlySweep likes this.
      4. atomicbob
        atomicbob
        @FlySweep - I replaced the bias resistors with a 10 turn precision resistors. Must be careful about initial setting but with a DMM it is easy to rebias appropriately. Can get exact voltages desired this way. Probably better to have a small series resistor with the precision resistor to set an absolute minimum resistance and thus maximum current to avoid letting out the magic smoke.
        Dec 4, 2017
        FlySweep likes this.
    7. atomicbob
      atomicbob
      One measurement post partially complete. 5 or 6 to go over the next several weeks (hopefully.) So far behind.
      1. zonto, Dino, jexby and 6 others like this.
      2. jowls
        jowls
        Great to see you back Bob. I hope your health is on the improve...
        Nov 28, 2017
      3. atomicbob
        atomicbob
        Thank-you, overall better but still have cardiac episodes. They are shorter in duration when they occur for now.
        Nov 29, 2017
        Dino and jowls like this.
    8. atomicbob
      atomicbob
      Five days of family Thanksgiving events. Both enjoyable and exhausting.
      1. Dino, Case, Cellist88 and 1 other person like this.
      2. Cellist88
        Cellist88
        Now after a short break, you gotta worry about christmas!
        Nov 26, 2017
        atomicbob likes this.
      3. atomicbob
        atomicbob
        Nov 28, 2017
        Cellist88 likes this.
    9. atomicbob
      atomicbob
      I am disgustipated ... set aside time for measurements and posting on a Sunday afternoon only to discover the kitchen faucet leaking ...
      1. Thad E Ginathom likes this.
      2. View previous comments...
      3. bengo
        bengo
        The neighbour helped me find the leak and fix it! Any mistake which doesn't kill you is an opportunity for learning. :) So now I know what a "Jubilee clip" is and why the washing machine hose should have one...
        Nov 20, 2017
        atomicbob and Thad E Ginathom like this.
      4. atomicbob
        atomicbob
        LadyLux3 was a PITA to uninstall and consumed a couple of hours. Several major components had siezed. Moen install was approx. 45 min. Kitchen functional again, wife happy. Thanksgiving back on track.
        Nov 22, 2017
        Thad E Ginathom likes this.
      5. Thad E Ginathom
        Thad E Ginathom
        The one quarter-turn mixer tap (faucet. That word puzzled me for years) that has never even dripped, let alone caused us any other problem, is the cheapest, non-branded, one that we have. When we asked about service, the guy who sold it to us said, "Throw it away and buy a new one." And this is a kitchen tap so it gets heavy use.
        Nov 22, 2017
        atomicbob likes this.
    10. atomicbob
      atomicbob
      I'm in for a ZDT Jr. Hoping it will deliver substantially similar auditory delight to my Zana Deux SE in a more transportable format.
      1. Aleatorius, Merrick, Case and 5 others like this.
      2. Ringingears
        Ringingears
        I’m in too. Just now. Hoping it will give me the ZD sound without all the heat.
        Nov 18, 2017
        atomicbob and Case like this.
    11. atomicbob
      atomicbob
      Have a lot of catching up; lots of data in the can. Hope to improve the SNR a bit.
      1. Dino, Serious, Neal and 19 others like this.
    12. atomicbob
      atomicbob
      Recovering from this season's first round of rhinovirus / crud. Wife is worse than me with her asthma. Several measurement posts pending.
      1. View previous comments...
      2. bixby
        bixby
        Mushroom soup for vitamin d, speedy recovery!
        Oct 18, 2017
        atomicbob and GoodEnoughGear like this.
      3. Dino
        Dino
        I hope you and your wife feel better soon. Measurement posts and etc can wait.
        Oct 18, 2017
        atomicbob and Elnrik like this.
      4. atomicbob
        atomicbob
        Now undergoing the second round of rhinovirus / crud. This time I have it worse than my wife, thankfully. Respiratory ailments are quite challenging for asthmatics.
        Nov 15, 2017
    13. atomicbob
      atomicbob
      Wow, take a few days away from the forum for corporate work and some measurements and look what happens ...
      1. atomicbob
        atomicbob
        It appears several inDUHviduals arrived, kicked over the buffet table, took a shit in the punch bowl, pissed off a lot of folks and generally decreased the S/N ratio.

        They would never dare do that in real life, say upon entering a biker bar. After the thrashing they'd find themselves stuffed in the garbage out back.
        Oct 10, 2017
        Luckbad, FlySweep, jowls and 9 others like this.
    14. atomicbob
      atomicbob
      Coincidence? I've had two SMPS wall warts malfunction within the last 24 hrs. Both were being used normally, not subject to experiments.
      1. ultrabike likes this.
      2. View previous comments...
      3. Elnrik
        Elnrik
        They were jealous of the Meanwell + Noise Nuke and committed suicide.
        Sep 29, 2017
        atomicbob likes this.
      4. Thad E Ginathom
        Thad E Ginathom
        Revenge of the wall warts!
        Sep 30, 2017
        atomicbob likes this.
      5. atomicbob
        atomicbob
        Revenge of the Wall Warts - I like it. Could be a song or even a movie along the lines of Attack of the Killer Tomatoes.
        Sep 30, 2017
    15. atomicbob
    16. atomicbob
      atomicbob
      42 also appears to be the low quantity parts cost (in USD) for the power supply LC filter I am currently testing.
      1. Cryptowolf and Luckbad like this.
      2. schiit
        schiit
        Wow, that's a serious filter. BIG choke?
        Sep 25, 2017
        atomicbob likes this.
      3. atomicbob
        atomicbob
        Hammond 155B - 6mH 2A and two 6800uF 63V Nichicon electrolytics. The CU-234 box was $10 and connectors add another $5 in unit quantities. It all adds up quick.
        Sep 25, 2017
        schiit likes this.
      4. atomicbob
        atomicbob
        Data on PS + LC measured effect on amps coming soon.
        Sep 25, 2017
        Luckbad likes this.
    17. Case
      Case
      Pointer Sisters and Monty Python referenced in the same thread - well done!
      1. atomicbob likes this.
      2. atomicbob
        atomicbob
        There are a few more subtle pop references in the measurement post as well.
        Sep 25, 2017
        Case likes this.
    18. atomicbob
      atomicbob
      The way @alvin1118 is handling a difficult situation continues to earn my respect!
      1. Ziva, Case, Thad E Ginathom and 6 others like this.
    19. atomicbob
      1. bigfatpaulie
        bigfatpaulie
        Thanks for answering my question. Much appreciated.
        Sep 16, 2017
        atomicbob likes this.
      2. landroni
        landroni
        What was the question again?
        Sep 16, 2017
        atomicbob likes this.
      3. Luckbad
        Luckbad
        Happy birthday? Or the answer to the ultimate question of life, the universe, and everything?
        Sep 16, 2017
        Case and atomicbob like this.
    20. atomicbob
      atomicbob
      What a day .... my social director had a colonoscopy today. Last 24 hrs have been challenging with the prep. We are both exhausted.
      1. View previous comments...
      2. imackler
        imackler
        I woke up talking about Star Wars after my colonoscopy.
        Aug 30, 2017
      3. Azteca
        Azteca
        @imackler my dad woke up saying that he was "going to Fartytown" and laughing heartily.
        Sep 1, 2017
        Dino, atomicbob and imackler like this.
      4. atomicbob
        atomicbob
        @Azteca - made me laugh - so sorely needed today - thankyou.
        Sep 1, 2017
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  • About

    Gender:
    Male
    Location:
    On planet
    Occupation:
    acoustic research scientist
    Gear List:
    See information section for my opinions
    My enjoyment of particular recreational music systems is inextricably intertwined with my personal preferences. The following lists are representations of my tastes in music, components and listening levels. The section on music is only a sample of my library but should provide sufficient insight into my musical preferences. I am rigorous and exacting with component measurements. That doesn’t automatically make my opinions worth anything without context. Use the following information to decide how well your own preferences converge or diverge with mine when I make comments about equipment in the forum. DO NOT blindly assume a positive comment from me about some component or headphone will automatically translate to auditory happiness on your part. Likewise you may find yourself enjoying something that I don’t. Consider (learning) your own personal preference.

    Music
    50s, 60s & 70s jazz
    Louis Armstrong, Charles Mingus, Thelonious Monk, Sonny Rollins, Miles Davis, Duke Ellington, Cannonball Adderly, Les McCann & Eddie Harris
    Recorded by Columbia (Frank Laico, Fred Plaut), Bluenote (Rudy Van Gelder), Contemporary Records (Roy DuNann)

    More recent jazz artists
    Wynton Marsalis
    Dave Grusin
    Dave Brubeck
    Bela Fleck
    Chick Corea
    Christian McBride
    Wycliffe Gordon
    Ingrid Jensen
    Steve Treseler
    Terell Stafford
    Ronnie Earl
    Steve Gadd Band
    Charlie Haden
    Brad Mehldau

    Medeski, Martin & Wood
    Medeski, Scofield, Martin & Wood
    Ill Considered
    Snarky Puppy
    Pat Metheny

    Artfully deviant
    Steve’n’Seagulls - Thunderstruck
    Two Cellos - Thunderstruck

    A class by himself
    Santana

    60s & 70s rock
    Emerson Lake & Palmer
    Blood Sweat & Tears
    Pink Floyd
    Jethro Tull
    JJ Cale
    Little Feat
    Dave Matthews Band
    Chicago
    Queen
    Cat Steven – Tea for the Tillerman
    Grateful Dead
    Lead Zeppelin

    Tangerine Dream
    Bruce Becvar
    Gary Stroutsos

    Classical composers
    Mozart
    Bach
    Beethoven
    Respighi
    Vivaldi

    Special
    Canadian Brass

    Listening Levels dBSPL
    60~70 quiet, background listening
    70~80 recreational and critical listening
    80~90 rocking out, often with libations at hand
    90~100 Santana Black Magic Woman / Gypsy Queen, ELP Tank - drum solo

    I tend to listen at quieter levels where electroacoustic transducers exhibit greater linearity. Higher levels are more likely to have greater distortion and require higher power amplification. The result is substantial deviation in opinions by listeners attempting to compare headphones when they are listening at different levels.

    DACs
    Treasured
    Holo Audio KTE Spring2
    Schiit Bifrost2
    Matrix Audio X-Sabre Pro
    Lavry DA11

    Enjoy
    Schiit Yggdrasil A2
    Schiit Gungnir MB A2
    Soekris 1421

    Work (recording, editing, acoustic measurements)
    Lavry DA11, AD11
    RME ADI-2 Pro

    Rather not listen
    Auralec Vega
    Resonessence Labs Concero
    Topping D30
    Objective DAC

    Universal Turd
    Audio-gd S19

    Amps
    Treasured
    Eddie Current Studio B
    Eddie Current Zana Deux SE
    ECP Audio DSHA-3F
    ECP Audio T4
    Shortest Way 51+
    Cavalli Liquid Crimson

    Enjoy
    Cavalli Liquid Platinum
    Schiit Lyr3 with PSVane 6SN7
    EC ZDT Jr after hum reduction modifications
    BottleHead Crack (PS modified, no speedball, e80cc driver)
    Cavalli MCTH
    Schiit Magni3+
    Schiit Vali2 with 6CG7
    Project Sunrise with 12BH7 and Linear Power Supply

    Rather not listen
    Objective 2
    Topping anything

    Headphones

    Treasured
    Sennheiser HD800-Jmod
    Focal Stellia
    Sennheiser HD600

    Enjoy
    Sennheiser HD650
    Focal Clear
    HiFiMan HE-500

    Rather not listen
    Most anything planar except for the HE-500

    System
    I developed a VST chain dubbed Immersion Virtualization System which I employ for my recreational listening. This has a substantial influence on my perception of component performance. See the IVS descriptions in the following links:

    https://www.superbestaudiofriends.o...-synergy-special-sound.54/page-14#post-129407

    https://www.superbestaudiofriends.o...-synergy-special-sound.54/page-29#post-221217

    Signature

    Organizing chaos for seven decades.