- Joined
- May 25, 2019
- Messages
- 158
- Likes
- 218
-
WANTED: Happy members who like to discuss audio and other topics related to our interest. Desire to learn and share knowledge of science required. There are many reviews of audio hardware and expert members to help answer your questions. Click here to have your audio equipment measured for free!
March Audio HPA1
- Thread starter Dialectic
- Start date
Well, turning the digital volume down means to lose bits, so not sure if this is bitperfect or not. What's important is by lowering the volume to not decrease DAC's SINAD lower than it's default value (probably any figure between 18 to 20 bits should do).
On what basis? Can you explain your concern?
If the noise doesn't gets attenuation you lose snr. It doesn't matter if it's 24bit or 64bit digital volume control.
Also when use digital attenuation it must not be bit perfect. Whether or not it affects performance is a different question.
restorer-john
Grand Contributor
Go hard. One bit volume adjustment. Flat out, or off.
Yes I have been through this in another post elsewhere, I will try and find the link.
That is correct, but it is in reality a theroretical problem and not a real world problem.
Dacs are now so quiet that even when the HPA1 is set to +6dB gain it is entirely silent. The noise floor is way below audibilty. So instead of the very real problems with analogue volume pots such as channel balance and noise which both get worse with wear, you have perfect balance and convenience of volume control through your app.
Anyway, its been a very long time coming but we are nearly there.
restorer-john
Grand Contributor
Oooh, I like it!
One thing. There is no polarity symbol on the 2.1/2.5mm DC jack. I'm hoping there's a diode to protect it, or a full wave bridge so it doesn't matter...
One thing. There is no polarity symbol on the 2.1/2.5mm DC jack. I'm hoping there's a diode to protect it, or a full wave bridge so it doesn't matter...
It certainly is protected. It will be in the manual (along with a note about "super duper" alternate power supplies not doing anything beneficial). I know you will probably find a dozen examples
but do many bits of kit these days have neg on centre pin?
Last edited:
Noted
DAC Stack
restorer-john
Grand Contributor
I know you will probably find a dozen examples
No, I agree. Thank goodness most 'sensible' manufacturers have standarised on centre pin positive.
But you know consumers, if they can f#$k it up, they will.
As for the nut, I quite like it. It's convex, chromed and looks the goods. Sure, you can have some scalloped, fluted, gold plated fiasco, but it's purely a mechanical mount and a hex nut does it well.
I certainly didnt want a board mounted one without mechanical fixing to the front panel. Board mounted will fail over time due to stress on the joints.
Veri
Master Contributor
- Joined
- Feb 6, 2018
- Messages
- 9,597
- Likes
- 12,039
Looks good to me
(is the lettering on the dac much bolder or is that just the photo?)
just the photo, my very amateur quick snapLooks good to me
restorer-john
Grand Contributor
Not good enough, you're playing with the big boys now...
next photo shoot here:
https://www.independent.co.uk/life-...e-villagestudio-soho-influencer-a8563371.html
This should be a great pairing with the new Topping D50s, which features remote volume control. For those that don't want to use software volume control (potential unexpected loud music).
Would just need RCA-to-XLR cables. Any issues with that @March Audio ?
Also, what is the current output (RMS) into 16 ohms?
And price?
Would just need RCA-to-XLR cables. Any issues with that @March Audio ?
Also, what is the current output (RMS) into 16 ohms?
And price?
Last edited:
Similar threads
