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  1. milosz

    A look at materials for magnetic shielding

    ...You do realize that this thread is meant to deal with finding materials to reduce the 60 Hz noise inductively coupled into nearby audio circuits from an internal power transformer..... and not as a discussion of grounding, power lines or anything of that sort? Some DIY amps I have made had...
  2. milosz

    A look at materials for magnetic shielding

    First off, the assumption is that the signal ground on high-end audio gear is isolated from the safety ground of the AC power distribution system, so signal ground is not connected to neutral or ground in your wall socket. At ~300 kHz the impedance of an 8 ft rod driven into damp earth...
  3. milosz

    A look at materials for magnetic shielding

    1964! You're even older than I am. FYI I never said that a good earth ground was useful in improving AC quality, I don't know where you got that impression. I have found by experience that using a (relatively) low impedance connection to a decent earth ground can help "drain off" certain...
  4. milosz

    A look at materials for magnetic shielding

    RE: RFI Typically there is no internal source of RFI inside an audio component (there are exceptions, see below) - most EMI is capacitively coupled from the outside at high frequencies. The typical aluminum enclosure used for most audio gear does an adequate job shielding the stray RF that is...
  5. milosz

    Schiitcago 2017 - 9/17/17

    >> There is an email list? If your talking about the Chicago notification thread, just unsubscribe.<< Yeah ok I see
  6. milosz

    Schiitcago 2017 - 9/17/17

    I didn't see any spots. Yeah I wasn't there long, but seeing nowhere to put my gear....
  7. milosz

    Schiitcago 2017 - 9/17/17

    I showed up and there was no space for me to set up. I RSVP'd that I was bringing gear, but when I arrived there was no space to set up, no organizer around that I could find. Good thing I didn't go to the trouble of bringing my DIY T2. Take me off this email list.
  8. milosz

    Schiitcago 2017 - 9/17/17

    I plan on bringing my HE-6 with the Beta 22 w/ onboard Curryman DAC and Amanero USB interface that I built. Here's a picture of the amp chassis with the DAC inside a copper sub-enclosure for shielding the analog circuitry from the digital RF of the USB interface and the DAC. Curryman DAC is...
  9. milosz

    The Beta 22 Thread

    Items? I don't understand
  10. milosz

    The Stax Thread III

    Has anyone seen a DIY T-2 for sale / sold?  I'm curious what price it would bring.
  11. milosz

    Modded Musical Fidelity XCAN-V3 with filtered power supply SOLD SOLD SOLD

    Musical Fidelity XCAN V3 headphone amplifier, modifications include: Removed input coupling electrolytics, replaced garden-variety rectifier diodes with fast/ soft-recovery HEXFREDs, replaced low-quality electrolytic filter caps with low-ESR high-quality Panasonic electrolytics, and replaced...
  12. milosz

    The Beta 22 Thread

    The two chassis are from eBay, but I machined the front panels to my design, and cut ventilation slots in the top and bottom panels     Here's a chassis before machining.  Very good quality for the money.   Here's an ebay item for one of these chassis (note, this ebay link will eventually...
  13. milosz

    The Beta 22 Thread

    NEW BUILD   Compact 2-chassis ß22 / σ22 2-board amp with built in DAC  (note: Genuine AMB / Glass Audio parts)   DAC is Curryman - ES9023 DAC with discrete FET output buffers ( https://www.minidsp.com/products/minidspkits/curryman-i2s-dac ) DAC has separate power supplies USB reciver is...
  14. milosz

    Pass Zen style class-A amp

    FYI this is for sale.... send PM
  15. milosz

    Why are there no 'high-end' 1/4" headphone jacks!?!?!

    Yeah that Lumberg looks nice and I bet it's well made but it's 3.5 mm not 1/4"  my HE-6, LCD-2 and HD-800's won't plug into a 3.5 MM jack and using an adapter kind of defeats the purpose.   Maybe I'll have to start manufacturing one myself.  I have in mind one that has a larger contact area...
  16. milosz

    The Stax Thread III

    Yes.
  17. milosz

    Pass Zen style class-A amp

    Built this amp using http://electronics-diy.com/zen-headphone-amplifier.php   Uses 1,000 uF motor run film caps for output coupling (switchable with 1,000 uF Elna Silmic II electrolytic cap for comparison), SIlmic II caps in circuit, IXYS FRED diode bridges, separate transformers / diodes /...
  18. milosz

    JansZen developing electrostatic headphones - crowdfunding info...

    Here's another CAD image.   The 3-circuit ring-tip-sleeve plug shown in the picture above worries me, can't have polarizing voltage on something like that. Are these self-energizing, rectifying audio to provide the bias?  ESP-6 tried that.... not many sold....very heavy if you put transformers...
  19. milosz

    The Stax Thread III

      No, but pointing to a 170 dB dynamic range and claiming it makes the DAC audibly superior to typical ~120 dB DACs is a marketing lie.    You said that having a 170 dB dynamic range prevents clipping on orchestral peaks, so you're saying that orchestral peaks exist that are beyond the...
  20. milosz

    The Stax Thread III

    Interesting to see a DAC claiming over 170 dB dynamic range.   ( http://www.msbtech.com/products/dacSelect.php )   A typical symphony hall has a background noise level between 35 and 50 dB.  5 meters in front of a typical symphony orchestra, max SPL is almost never above 100 dB.  And, of...
  21. milosz

    JansZen developing electrostatic headphones - crowdfunding info...

    JansZen is now under the ownership of David Janszen, son of the late founder / inventor Arthur Janszen.  David Janszen is an engineer AND a musician.   JansZen currently makes some very well regarded hybrid electrostatic speakers, which you can see at http://www.janszenloudspeaker.com/   ...
  22. milosz

    The Stax Thread III

    One of appeals of tall  planar speakers (Speakerlab, Magneplanar) and the various multi-driver tall arrays is that their SPL falls off  at 3 dB per doubling of distance as opposed to 6 dB for a point source; in addition reflections from floor and ceiling are much lower in amplitude at the...
  23. milosz

    The Stax Thread III

      What problems are you having?  Stax Mafia giving you any help?
  24. milosz

    Did Sennheiser just reveal the Orpheus successor?

    $14k in 1991 = $24,000 to $26,000  in 2015 depending on how you calculate inflation    $40k is quite a bit more than the Orpheus.   ============================================================================   There are people who don't get enough to eat in the US. Anyone who spends $40k...
  25. milosz

    The Stax Thread III

    I don't always listen to headphones, but when I do, I listen to electrostatics.  
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