Kyle / MrHeeHo
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Will the HPA1 be safe to used with in-ear monitors?
Not sure what you mean by "safe".Will the HPA1 be safe to used with in-ear monitors?
Now this is getting out of hand and rather unnecessary!Do it wrong and worst case scenerio a plane could fall out the sky.
Now this is getting out of hand and rather unnecessary!
Hi Don,A few years ago I worked with a guy who was also into the DIY airplane crowd. They got together every weekend to work on and sometimes fly their planes. Some were kits, some from plans, some completely original designs (within the constraints of physics). And yes one of the guys was seriously injured when his engine died a little after take-off and the plane crashed, falling out of the sky.
Google engineering disasters and you'll find plenty of times things went wrong. One of the more famous was the Tacoma Narrows bridge: https://en.wikipedia.org/wiki/Tacoma_Narrows_Bridge_(1940)
DIY audio has had more than its fair share of accidents, often when power supplies go bad or things are wired wrongly. One of my favorites was when someone got the primary and secondary windings of a transformer reversed. Exciting, it was. He has a permanent scar on his cheek from pieces of the main filter caps exploding in his face.
Do as I say, not as I do?Better just to say nothing when you have nothing reasonable to say.
I meant safe as in listening levels, I personally use the Ultimate Ears Reference Remastered which is 35 ohms with a 100db sensitivity at 1mwNot sure what you mean by "safe".
Its free from any significant turn on/off pops. Beyond that its up to the user to be responsible with listening levels.
I use Westone 4R IEMs. They are a lot more sensitive than say my HD6xx, but no sign of amp noise hiss and sounds great.
I meant safe as in listening levels, I personally use the Ultimate Ears Reference Remastered which is 35 ohms with a 100db sensitivity at 1mw
How's this endeavour going for you Alan ? Are you enjoying it mate ?Well, after losing 2 months due to a Chinese manufacturer that didnt deliver I finally have some Australian made release candidate PCBs (final prototype) on my bench.
Performance is beyond my measurement capabilities, so need an Audio Precision hooked up to get the final numbers, but its sounding great..........well I would say that
So only a month or so to get the cases finished and it should be on sale.
View attachment 23849
Hi ThomasHow's this endeavour going for you Alan ? Are you enjoying it mate ?
Too much pressing of the 'D' key - dB, dBFS, DAC, SINAD, THD, distortion, dynamic...What happened to the "D" key on the Lenovo, acetone, super glue or that nice french-tip nail polish wasn't dry?
https://stoneracoustics.com/udxa
This headphone has no volume control. It's been out for a while. Think it's digitally controlled
Hi @restorer-johnLooks good! How was your experience with the Australian PC board house? I need to find a decent one myself.
What happened to the "D" key on the Lenovo, acetone, super glue or that nice french-tip nail polish wasn't dry?
Hi @Mr. OlinadHi @March Audio (Alan)
I came here when I saw some comments on JDS Labs Atom review and now I'm really interested in your amp.
The only question I have is about single ended input.
As you say, the amp has a "Balanced XLR input design (compatible with single ended RCA)".
As I don't have a balanced DAC (all I have is a Topping D50) I would like to know what am I going to miss if I use the Topping D50 instead of something like SMSL SU-8 or Topping DX7s.
Will I miss any quality or output power when using single ended input?
By the way, the most important question.
Would you ship it to Brazil?
I was wondering how did you get this low ps noise. Isolated smps, well done.Well the HPA is powered from an external CE/FCC approved Wall wart SMPS. 12 V in. This is followed by an internal isolated (to 1500v) supply. I even considered medically approved version to minimise leakage current, but decided it was unnecessary. The unit is all low dc voltage, low power, nothing hot with correctly voltage rated caps. The output circuitry can deal with indefinite short circuit.
Beyond that I suppose you could drop the unit on your foot............
[...]I am making a final change to the design so it has switchable gain, 0dB (unity) and +6dB, as a potential professional customer requires fixed 0dB gain bur domestic use may still require +6dB to cater for the widest range of headphones.
[...]