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  1. atomicbob

    Seattle 11/07/20 impressions

    Thank-you for hosting the virtual meet @BIG POPPA , it was really great to interact with everyone. I really enjoyed @johnjen providing a detailed tour of The Purple Amp. Looking forward to hearing that when crazy times subside. My Zoom audio setup included Soekris 1421 DAC driving The Bachelor...
  2. atomicbob

    Official Seattle meet 01/25/20 Impressions

    thank-you for once again organizing this quarterly meet @BIG POPPA highlights for me included: @johnjen purple amp which had the midrange magic nailed along with a good representation of the entire auditory spectrum. Much more bass impact than I would have expected. @gefski asgard 3 which...
  3. atomicbob

    Seattle Meet Off the Chain 9/7

    First, many thanks to @BIG POPPA for organizing yet another successful meet. One of the changes that has occurred over time is the rather large increase in synergistic systems appearing at the meet. I could easily sit at a system and settle in (wishing micro-brew or glass of red in hand) and...
  4. atomicbob

    Seattle Meet Saturday Sept, 7

    email sent with long story. Short story here: after leaking in-wall pipe water damage, lab restoration is now complete, 4 months and $20K later. Hope to see you at meet and hear your big iron tube amp project.
  5. atomicbob

    Seattle Meet Saturday Sept, 7

    Anyone interested in hearing Schiit Bifrost MB 2 and ECP Audio T4 with Mullard CV4024 tubes to an HD800J-mod?
  6. atomicbob

    Monoprice Monolith Liquid Platinum - By Alex Cavalli

    Let me get this straight. Someone can afford an APx555 analyzer and then doesn't take the minimal extra step of constructing a Neutrik NC4MX breakout cable for 30R and 300R loading of each channel with other side of resistor loads having cable to pair of NC3MXX to plug into the analyzer balanced...
  7. atomicbob

    Monoprice Monolith Liquid Platinum - By Alex Cavalli

    Please look at the blue line in the 12 dB attenuation graph in this post: https://www.head-fi.org/threads/goldpoint-sa2x-nobsound-ns-05p-passive-attenuator-comparison-technical-measurements.899382/#post-14761029 With 2 feet of a low capacitance cable, Belden 1800F, high frequency roll-off was...
  8. atomicbob

    Monoprice Monolith Liquid Platinum - By Alex Cavalli

    Harrison Labs 12 dB attenuator comprises the following based on data available from the internet: That is as simple as it gets. Attenuation is actually 12.24 dB. If Nobsound would actually change the NS-05P from a 50K Alps to a 10K Alps pot, that would be the better solution. I had seen the...
  9. atomicbob

    Schiit SYS Passive Preamp

    It has become popular to reverse a 2-input passive attenuator to switch between two outputs. While not exactly recommended, as long as the potentiometer is set to maximum and left at that position the source will only see the additional load of the pot, which is usually between 10K to 100K. The...
  10. atomicbob

    3/03/19 Seattle Lake City impressions

    Big thank-you to @BIG POPPA for organizing another successful meet. I was surprised with a gift from several of the regulars; a power distribution box with three duplex outlets, each using a different metal. High purity copper, rhodium, and cryo treated silver. Also has an on-board voltmeter...
  11. atomicbob

    03/03/19 Seattle Meet, Lake City

    4 pin balanced cable? then yes for me. Amp I might bring will only handle true 4 wire balanced connections. No 3-wire headphones - 3-wire will damage the amp.
  12. atomicbob

    Monoprice Monolith Liquid Platinum - By Alex Cavalli

    Until that time I suggest everyone consider a new paradigm with Liquid Platinum. The LP has exceptionally low distortion and square wave response is nearly that of the Liquid Crimson; almost perfect. This great clarity translates to hearing and differentiating source components at a level few...
  13. atomicbob

    Monoprice Monolith Liquid Platinum - By Alex Cavalli

    Schiit Sys will measure better than NS-05P when attenuation is between 1 and 20 dB. NS-05P has advantages of balanced inputs and outputs. If intended for balanced use with 20dB or greater attenuation, then NS-05P has advantages. Whether all this means either will sound better than the other...
  14. atomicbob

    Monoprice Monolith Liquid Platinum - By Alex Cavalli

    The big issue with NS-05P is use of a 50K pot instead of 10K. High end roll off issues would be eliminated if Nobsound changed the Alps to a 10K pot. Schiit Sys uses a 10K pot. All passive attenuator pots have imbalance issues at high attenuation. Stepped attenuators are the way to eliminate...
  15. atomicbob

    Goldpoint SA2X - Nobsound NS-05P passive attenuator comparison technical measurements

    1. Will you use less than 20 dB of attenuation? 2. Can you hear -1 dB at 10KHz? 3. Do you care about channel imbalance at high attenuation? If yes to #1 and #2, then you will likely hear the NS-05P to rolling off highs between 1 and 20 dB attenuation. If yes to #3 then low volumes will change...
  16. atomicbob

    Monoprice Monolith Liquid Platinum - By Alex Cavalli

    Here is a link to measurements I made comparing two passive attenuators of which I used with Liquid Platinum (and other amps): https://www.head-fi.org/threads/goldpoint-sa2x-nobsound-ns-05p-passive-attenuator-comparison-technical-measurements.899382/
  17. atomicbob

    Goldpoint SA2X - Nobsound NS-05P passive attenuator comparison technical measurements

    Frequency Response vs cable type and length SA2X blue - NS-05P red in graphs below 42 dB attenuation Belden 1800F 2 ft 42 dB attenuation Canare L-4E6S 1_5 ft 42 dB attenuation Canare L-4E6S 10 ft At 42 dB attenuation again there is little performance difference between the two passive...
  18. atomicbob

    Goldpoint SA2X - Nobsound NS-05P passive attenuator comparison technical measurements

    Frequency Response vs Attenuation 42 dB Attenuation - Belden 1800F cable 2 ft SA2X (blue) NS-05P (red) performance is essentially identical out to 40 KHz 36 dB Attenuation - Belden 1800F cable 2 ft SA2X (blue) NS-05P (red) performance is essentially identical out to 20 KHz 24 dB...
  19. atomicbob

    Goldpoint SA2X - Nobsound NS-05P passive attenuator comparison technical measurements

    Square Wave Response and Channel Imbalance NS-05P square wave 20 Hz 2 Vpp 10 mS / div 10K load 100 KHz measurement BW 20 dB attenuation Same low frequency response as any other potentiometer or stepped attenuator. NS-05P 20 Hz square 2000mVpp input 20 dB atten 500nS div 20 MHz filter...
  20. atomicbob

    Goldpoint SA2X - Nobsound NS-05P passive attenuator comparison technical measurements

    Select Measurement Comparisons Frequency response with 20 dB attenuation from +20 dBu SA2X NS-05P SA2X has negligable high frequency roll off while NS-05P drops approximately 0.65 dB at 20 KHz. Gain linearity with 20 dB attenuation from +20 dBu SA2X NS-05P NS-05P gain linearity...
  21. atomicbob

    Goldpoint SA2X - Nobsound NS-05P passive attenuator comparison technical measurements

    Goldpoint SA2X - Nobsound NS-05P passive attenuator comparison technical measurements Standard Prologue If you are unfamiliar with audio measurements please use a search engine with the query: "audio measurements" or "audio measurement handbook" Look for publications by Richard C. Cabot and...
  22. atomicbob

    Monoprice Monolith Liquid Platinum - By Alex Cavalli

    See picture of Liquid Platinum supplied SMPS: Everything you need to know is contained in that picture. Standard IEC 320 C8 inlet on the Fuyuang SMPS. Voltages, currents, regulatory approvals can all be seen on the label.
  23. atomicbob

    Monoprice Monolith Liquid Spark - By Alex Cavalli

    There are some lower cost options available: Quantasylum QA401 https://quantasylum.com/products/qa401-audio-analyzer While this doesn't have the noise floor or advanced level SW measurement sets, it does well enough for most standard amplifier measurements. I have one in my lab that I use from...
  24. atomicbob

    Monoprice Monolith Liquid Spark - By Alex Cavalli

    Liquid Spark residual noise measures as follows: -115 dBu A weighted (standard used by most manufacturers - attenuates 1/f noise and mains noise) -107 dBu unweighted (includes 1/f noise and mains noise) Most manufacturers prefer to report A weighting. Liquid Spark with supplied SMPS does...
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