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Oppo HA-1 Impressions Thread - Page 10

post #136 of 4750
Quote:
Originally Posted by .Sup View Post


I agree with your opinion, pretty much exactly what I was thinking a couple days ago - it has everything you'd want from an all-in-one headphone setup and is, at the same, simple enough to use.

 

Yes, and it looks like a great pre amp for a speaker system. It comes as no surprise to me that this is sold out.


Edited by Hooster - 5/10/14 at 1:38pm
post #137 of 4750
Quote:
Originally Posted by elvergun View Post


Where are the Head-fi beta testers with their impressions??????

 

Waiting for our retail versions...  (Most of us chose the silver cabinet, so we won't see them until some time in June.)

 

I'll chime in with an impressive story of OPPO's tenacity in finding and fixing problems....

 

Early on, with the first of two HA-1 beta prototypes, I was hearing a low-volume series of seven or eight pops, each series lasting about two to three seconds, but occurring randomly every minute or two. Trying to isolate it, I discovered that I could hear the pops in my headphones, no matter which source input was selected and with nothing plugged into the HA-1 except the power cord (and the headphones, of course). And it made no difference where the volume control was set, but the more efficient the headphones, the louder the pops. It really made testing the HA-1 difficult.

 

I eventually figured out that it was WiFi noise getting into HA-1 from my el cheapo Acer Aspire One netbook.  

 

Have a look at how closely it was sitting to the front panel of the HA-1 prototype - this photo was taken in mid-December of last year:

 

 

PM-1 and HA-1 prototypes, HD800, LCD-2 rev.1, HD600, DACmini CX, TBI MG3, Def.Tech.SM45s

HD650, Resonessence Concero, Beresford Bushmaster MkII, and Schiit Vali were later added during beta testing.

 

As you can see in the photo, my netbook was just a few inches from the HA-1's front panel.  In addition to the intermittent sets of pops, whenever I was in the middle of downloading any large files to my netbook, I could hear a very faint sizzling sound in the headphones - again, even with no cables attached except for power and headphones, and adjusting the volume control made no difference.  

 

As I moved the netbook away from the HA-1, the noise problems faded proportionately.  Other HA-1 beta testers weren't having problems with noise - it would have been easy for OPPO to consider my situation a "fluke," doing nothing about it.  Instead, they asked me a bunch of questions, leading eventually to my telling them the make and model of the WiFi radio in my netbook, as well as the driver revision I was using for it.  It took them a couple of weeks, but they actually reproduced my problem -AND- came up with a solution!

 

Here's what was happening...  

 

In the early photos of HA-1 prototypes, you can see that the Bluetooth antenna was positioned at bottom-center on the rear panel:

 

Source:  http://www.computeraudiophile.com/f6-dac-digital-analog-conversion/oppo-ha-1-a-18033/

 

It turns out that even when Bluetooth wasn't selected as a source, the antenna was receiving signals from my Acer's WiFi radio, energizing the shielded cable that was routed through the chassis in close proximity to some portion of the HA-1's audio path. 

 

OPPO killed two birds with one stone...

 

Beta testers had been complaining about having to access the rear of the unit to adjust the two-position Gain screw (with a flat-blade screwdriver) every time we wanted to switch to headphones that required the other Gain setting (Normal vs. High).  So OPPO got rid of the Gain screw (that originally resided above the antenna), making the Gain setting a front-panel controlled software function, then moved the Bluetooth antenna up to where the Gain screw had been located, while also re-routing the antenna's cable to keep it away from the audio section.  Joy!

 

Compare the prototype's rear panel to the version that's shipping:

 

Source:  http://www.oppodigital.com/headphone-amplifier-ha-1/headphone-amplifier-HA-1-Images.aspx

 

A "Trigger In" has also been added where the Bluetooth antenna previously resided.
 
Best of all - my WiFi noise is completely gone!  I can set my Acer netbook on top of the HA-1, right next to it - in front, behind, or to either side - and I hear absolutely no WiFi noise.  All gone!
 
I must have had one of the noisiest laptops in the beta group, but OPPO tenaciously pursued a fix for my problem, and in doing so, made the product more bulletproof for everyone.  And that's just the tip of the iceberg, really.  Lots of enhancements were recommended by beta testers - several of them implemented, some not, especially via firmware.
 
OPPO's practice of releasing their products after lots of end-user testing and multiple firmware upgrades, is in stark contrast to my experience with many other audio manufacturers (DAPs come to mind, especially).  I can assure you, the wait for OPPO to release the HA-1 will have been more than worthwhile for those who have been gnashing and grinding their teeth in anticipation.  This thing is ready for use!
 
Mike

Edited by zilch0md - 5/10/14 at 2:53pm
post #138 of 4750
Quote:
Originally Posted by Dixter View Post
 

@ OPPO

 

Should we start a new thread for firmware wishes ???

 

Curating a thread for firmware wishes is definitely something that would be beneficial, but not required to have us work on enhancements. We will be monitoring the threads for suggestions, and all direct contact (mail and phone) will also be registered into our internal databases which are referenced for firmware enhancements.

 

Quote:
 Curious about the front USB input for the mobile devices....   can the USB input also act as a OTG reader or a memory stick reader?

 

Unfortunately no. The USB port can only be connected to devices which can act as the decoder. The HA-1 is just an amplifier/DAC, so it can't decode anything from an attached storage device.

post #139 of 4750
Quote:
Originally Posted by HasturTheYellow View Post

Curating a thread for firmware wishes is definitely something that would be beneficial, but not required to have us work on enhancements. We will be monitoring the threads for suggestions, and all direct contact (mail and phone) will also be registered into our internal databases which are referenced for firmware enhancements.


Unfortunately no. The USB port can only be connected to devices which can act as the decoder. The HA-1 is just an amplifier/DAC, so it can't decode anything from an attached storage device.
Quote:
Originally Posted by HasturTheYellow View Post

Curating a thread for firmware wishes is definitely something that would be beneficial, but not required to have us work on enhancements. We will be monitoring the threads for suggestions, and all direct contact (mail and phone) will also be registered into our internal databases which are referenced for firmware enhancements.


Unfortunately no. The USB port can only be connected to devices which can act as the decoder. The HA-1 is just an amplifier/DAC, so it can't decode anything from an attached storage device.

Appreciate all the clarifications, Hastur. I think some people are expecting more out of this device than it already has packed in this unit. You can't blame em, since Oppo's Bluray players are somewhat like Swiss army knifes... sometimes, less is more.
post #140 of 4750
Quote:
Originally Posted by Dixter View Post

Would be cool as a firmware upgrade if they would let you change the color of the VU meters...  It would be nice to have that McIntosh blue/green color to it...     and add the same color to the spectrum display too... 

While we're at it, how about a screen that shows us the warm glow of tubes? A little like the fake tube glow on the Yamaha THR-10 practice amp. smily_headphones1.gif

//TB
post #141 of 4750
Quote:
Originally Posted by ogodei View Post

When used as DAC only (Home Theatre Bypass against USB input)media controls no longer work but Mute does against both Headphone and Pre-amp outputs.

That's odd; I just turned on home theater mode on USB and I can still use the transport controls on the remote to control JRiver.

I have the unit fairly high on a shelf and I have to lift the remote up for it to work, i.e. the up/down angle seems to be a little limited.

//TB
post #142 of 4750
Quote:
Originally Posted by docBliny View Post


While we're at it, how about a screen that shows us the warm glow of tubes? A little like the fake tube glow on the Yamaha THR-10 practice amp. smily_headphones1.gif

//TB

How about some blue McIntosh meters..

post #143 of 4750
Quote:
Originally Posted by ogodei View Post



So: warm to the touch but I can comfortable leave my hand on it.  It seemed to be putting out more heat when I did that last post.

thank you again
heat is acceptable, a little outside of the manuals safe operating temperature, where i'm from can get up to 113F ambient.
perhaps these clicks can be removed with a firmware upgrade?
post #144 of 4750

Some images from Japan c/o Phile-web

 

 

 

post #145 of 4750
Quote:
Originally Posted by Shenook View Post
 

so I am considering this and the bmc puredac. THE puredac guys said the oppo controls volume through a resistor rather then juice through the dac. I am a noob so what does that mean and what does it matter?

 

Digital volume control is done by changing the bit value of the signal.     This is done in the digital domain (the DAC stage).

 

Resistor-based value control is how all analog devices attenuate the volume - through a potentiometer of one sort or the other.   This is done in the preamp/amp stage.

 

Some people will argue that digital is cleaner, as it allows more precise, matched changes whereas any variations in L and R potentiometers can affect channel balance.    Others argue that digital attenuation results in loss of fidelity (essentially, you are discarding bits).     In the real world, it is quality of implementation that matters more than anything else.

post #146 of 4750
It seems like several people here have actually auditioned this amplifier, but no one has mentioned anything about the sonics. Should I imply that the sonics are unremarkable? I wish somebody would report something about the sound quality.
post #147 of 4750
We're chicken!

biggrin.gif

post #148 of 4750
Quote:
Originally Posted by zilch0md View Post

We're chicken!

biggrin.gif

 

This is by far the weirdest beta testing and release I've seen here at Head-Fi since I became a member. :cool:

post #149 of 4750
biggrin.gif

I should make a T-shirt that says, "I survived the PM-1 thread."
post #150 of 4750
Quote:
Originally Posted by Peter_S View Post

It seems like several people here have actually auditioned this amplifier, but no one has mentioned anything about the sonics. Should I imply that the sonics are unremarkable? I wish somebody would report something about the sound quality.

^Not sure what you are looking for with regard to "sonics".
As a few others have said, it is neutral and natural without coloring the sound.
There's no hint of hiss or buzz or any other anomalies.
IMHO, that's as good as it gets. wink.gif
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