[Smarty-pants]

I don't trust on VOOC Rapid charging technology at all

I've had a couple of DELL Laptops with rapid charging technology only to have ruined the battery in less than 2 years

I don't know anything about the tech specs of the rapid charging system of the HA-2,
but fwiw, Oppo does claim on their website that the tech they use is "patented", so I assume that means it's
patented exclusively for Oppo. Maybe HasturTheYellow can provide some more info on that when he pops in again.

 

[roflcopter159]

Definitely interested in hearing someone's impressions on the HA-2 with LCD 2 and/or Mad Dogs. Was looking at getting a Fiio E12, but if this is a good deal better, I may just keep saving for this. 

 

[money4me247]

i think it is possible to do that charging setup like zilch0md stated, but probably just highly not recommended as it will probably be determental to the battery's health.

 

[x RELIC x]

Definitely interested in hearing someone's impressions on the HA-2 with LCD 2 and/or Mad Dogs. Was looking at getting a Fiio E12, but if this is a good deal better, I may just keep saving for this. 

Better in what way? It's a beautiful unit with a great DAC but if amp power is your concern the HA-2 has a quarter the power of the e12 @32 Ohms. I use the e12 with the LCD-2 and it is a great combo.

If you want to use it for less demanding headphones, or have a portable DAC, or want the IOS/android functionality the HA-2 is a great unit, but I'm only looking at specs as I haven't heard the HA-2.

 

[roflcopter159]

Better in what way? It's a beautiful unit with a great DAC but if amp power is your concern the HA-2 has a quarter the power of the e12 @32 Ohms. I use the e12 with the LCD-2 and it is a great combo.

If you want to use it for less demanding headphones, or have a portable DAC, or want the IOS/android functionality the HA-2 is a great unit, but I'm only looking at specs as I haven't heard the HA-2.

Well I was thinking about how well they would each make the LCD 2 and Mad Dogs sound. The portable DAC would be nice, and I'd definitely like that, but if the amp isn't as good/powerful as the E12 with either of those headphones, I may have to pass. Especially for a difference of $180. Though, I will definitely agree that it is an amazing looking piece of equipment

 

[Sorefoot19]

I'm intrigued by the new OPPO HA-2.  I currently have the Fiio E12, but it doesn't include a DAC so I am considering an upgrade. Since I'm not very knowledgeable about electronics, I'm hoping someone can tell me how to understand the power ratings of different portable amp/dac combos.
 
The OPPO specs listed on the web site are in mW.  Other DAC./amps seems to list VRMS (see below).  My main HPs are T1, HE500, HD600, Alpha Dog and X2.  Is there a simple equation to convert disparate data like this, or do I just have ask each manufacturer to provide both sets of numbers?   OPPO clearly states that the HA-2 is good only up to 300 Ohms.  My E12 powers the T1 (600 Ohm) fine on high gain - at least in terms of loudness, so can I assume the HA-2 is less powerful? 30mW into 300 Ohms seems low, and I believe that is at the higher volume settings on the HA-2.  However, to be honest I can't tell if the other Amp/DAC listed below is any different. 
 
Thoughts from someone smarter than me?
 
OPPO HA-2
Maximum Headphone Output Power           
300 mW into 16 Ohm
220 mW into 32 Ohm
30 mW into 300 Ohm
 
OTHER AMP/DAC
Max Output @ 600Ω            4.146 VRMS
Max Output @ 150Ω            3.580 VRMS
Max Output @ 32Ω            1.182 VRM

 

[almarti]

Please, keep me update on this resolution of mW to/from VRMS.
 
Any ready comparison between Oppo HA-2 and iFi micro iDSD, they are my shortlist to pair with 16-32ohm IEMs, Senn HD600 (300ohm) and Senn PXC450 (150/750 ohm passive/active mode).
But I can not forget the CEntrance HiFi-M8 and Theorem 720.
Then as I have an Audioquest Dragonfly v1.2 the FiiO E12 is an alternative?
 
Any help on what to do for my portable DAC/Amp combination (always connected to iPad mini FLAC?
At home, iPad/PC -> DragonFly -> Schiit Asgard 2 -> HD600
 
Thanks a lot.

 

[gerelmx1986]

what Frequency range does the Bass boost targets?

 

[avi8tor]

To compare mW to VRMS:
 
mW = 1000 * VRMS * VRMS / Impedance
 
OPPO HA-2
Maximum Headphone Output Power           
300 mW into 16 Ohm
220 mW into 32 Ohm
30 mW into 300 Ohm
 
OTHER AMP/DAC
Max Output @ 600Ω            4.146 VRMS ->  1000 * 4.146 * 4.146 / 600  = 28.649 mW
Max Output @ 150Ω            3.580 VRMS -> 85.443 mW
Max Output @ 32Ω            1.182 VRM -> 43.660 mW

 

[Smarty-pants]

what Frequency range does the Bass boost targets?

I'll second that inquiry too.
If any beta testers or early adopters happen to have frequency response charts comparing the
sound WITH and WITHOUT the bass boost, that would be excellent.

 

[shigzeo]

I'll second that inquiry too.
If any beta testers or early adopters happen to have frequency response charts comparing the
sound WITH and WITHOUT the bass boost, that would be excellent.

I can get that done today if you want.

 

[Sorefoot19]

Thanks for the formula on mW vs. VRMS.  It makes comparisons much easier.

 

[ClieOS]

The conversion between mW to Vrms assumes the current remains constant. It might not always be the case.

 

[Poimandres]

I am also curious about the hiss. I was waiting for the Calyx F however the HA 2 is very enticing at this price.

 

[kawaivpc1]

I am also curious about the hiss. I was waiting for the Calyx F however the HA 2 is very enticing at this price.

I bet Calyx F will be much better. As you know, many reviewers have mentioned that Calyx M is the only device that sounds comparably good to AK240.
If they're going to release a Calyx F with slightly improved sound quality and battery life, it can be like an AK240 without LCD screen.
I would prefer that over HA-2.  If it's going to sound that good, $499 price tag isn't too bad either.