March Audio HPA1

[JohnYang1997]

Quote from RME
"One of our testers with very sensitive ears was able to hear the self noise at -115 dBu in our first prototype with highly sensitive Andromeda in-ears, so I had to modify the IEM output stage again, and finally reached -118 dBu. He was satisfied then."
Andromeda is only 112.8db/mw and 12.8ohm a little bit more sensitive than my heaven V.

 

[JohnYang1997]

105/106dB

Look, I am sure if you try hard enough you can fins some IEMs that are sensitive enough to make some noise audible, but these are the outliers.

My calculation from amir's measurement is 2.8uV for dac out.

 

[JohnYang1997]

It really needs to be a magnitude under audibility to be complete fine. At the edge or even more than audibility for most relatively sensitive iems is not that great. It's not bad i would say, just that there is room for improvement. Maybe a voltage divider selection on and off while still maintain the advantage of digital volume. Not necessarily has to be automatic like rme.

 

[March Audio]

My calculation from amir's measurement is 2.8uV for dac out.

My bad, I looked at SINAD not SNR.

 

[March Audio]

It really needs to be a magnitude under audibility to be complete fine. At the edge or even more than audibility for most relatively sensitive iems is not that great.

That doesnt make sense. Some is either audible or it is not audible. Being a magnitude under audibility makes no additional difference.

 

[JohnYang1997]

That doesnt make sense. Some is either audible or it is not audible. Being a magnitude under audibility makes no additional difference.

Just to avoid possibility of some individuals and some potential earphones to pass audibility. Personally 0.2uV to 0.6uV is my target.

 

[March Audio]

Just to avoid possibility of some individuals and some potential earphones to pass audibility. Personally 0.2uV to 0.6uV is my target.

Well, TBH the benefits of digital volume outweigh the concerns of a very small number of users who have the worlds most sensitive IEMS

 

[deafenears]

View attachment 29955

Not using the XLR + TRS jack combo like you do with your amps?

 

[March Audio]

Not using the XLR + TRS jack combo like you do with your amps?

Simply a size issue. The case is the same size as the dac1 and combos wouldn't quite fit.

The amps may also change to just xlr in the future.

 

[Willhelm_Scream]

How much longer till the amp is released?

 

[bigjacko]

Is there any update on the amp?

 

[deafenears]

How much longer till the amp is released?

Looks like it's real soon now.

Is there any update on the amp?

If you squint at this YouTube clip, you might be able to make out the specs and pricing.

Here's what I can make out:

Power output: 200mW at 32Ohm
Voltage gain: 0dB or 6dB?
Input impedence: 47kOhm?
SNR: 128dB?
THD: 0.00011%?

 

[bigjacko]

I saw 475 dollar, is it usd or aud?

 

[March Audio]

The HPA1 is here and ready to go, I just haven't updated the website yet.

It's been crazy busy over the past month with moving from Perth to Albany and prepping for and exhibiting at the Melbourne show.

I have a bunch of orders to fulfill after the show, so that is priority, but will get the HPA1 in the webshop ASAP.

$475 was a show discount price in AUD. Normal price is $375 usd which is about $550 AUD.

 

[bigjacko]

Nice, is there any measurement? When will it be available?

 

[March Audio]

About a week
Yes.

 

[therobin]

Do these measurements represent the final product or a prototype?

 

[March Audio]

Do these measurements represent the final product or a prototype?

Final

 

[March Audio]

Now avaialble in our webshop

https://www.marchaudio.net.au/hpa1

 

[March Audio]

BTW Price is $375 usd