Note: Oppo has since stopped making products, although they still support existing ones and will occasionally provide firmware updates. This is sad news as I considered some of their products (the ones I tried) to be among the best. These include their fantastic Oppo PM3 headphone, and this HA2 Amp that we’re about to review. You can still get your hands on one for a decent price, but please be careful who you buy from. You can also check eBay as well for some good deals!
Oppo Digital Says Goodbye 🙁
With that let’s get into the review!
Aloha friend and Welcome aboard!!
Before we get into the Oppo HA-2 Review, grab a snack, sit back and relax because…
You’ve come to the right place!!
What I will bring you in this review
- In The Box
- Intro/In The Box
- Features & Connections
- Ergonomics & Sound
- Pros & Cons
- My Video Review
- Photo Gallery
Now without further ado, let’s get rolling!
- Dimensions: (W x H x D) 2.7 x 5.375 x 0.5 inches, 68 x 137 x 12 mm
- Weight: 6.2 oz, 175 grams
- Frequency Response: 20 Hz – 200 kHz
- Audio-in Level: 1 Vrms.
- Line-out Level: 1 Vrms.
- Recommended Headphone Impedance: 16 Ohm – 300 Ohm.
- Maximum Headphone Output Power (Per channel): 300 mW into 16 Ohm,
- 220 mW into 32 Ohm, 30 mW into 300 Ohm.
- Headphone Amplifier Output Impedance: 0.5 Ohm. What is Output Impedance?
- Output Jacks: 3.5mm stereo headphone, 3.5mm stereo line-out.
- Input Ports: Analog: 3.5mm stereo audio-in. Digital: USB A for iPod/iPhone/iPad; USB micro-B for smartphones with USB OTG feature and computers.
- DAC Chip: ESS Sabre 32 Reference ES9028-Q2M
- Input Format: Stereo PCM, Stereo DSD (DoP v1.1 or native)
- PCM Sampling Frequencies: 44.1 kHz – 384 kHz, 16 / 24 / 32-bit.
- DSD Sampling Frequencies: 2.8224 MHz (DSD64), 5.6448 MHz (DSD128), 11.2896 MHz (DSD256, native mode only)
- Profile: USB 2.0, USB Audio 2.0
- Included Accessories: Power Supply Unit (Rapid Charging Charger)
USB A – USB micro-B data and rapid charging cable
USB A – Lightning data cable (for Apple devices)
USB micro-B to micro-B data cable (for Android and other smartphones)
3.5 mm – 3.5 mm stereo audio cable
Silicone rubber band (2 pieces)
User guide and warranty documents
- Built-in Battery type: 3000 mAh lithium polymer rechargeable battery.
- Battery Operation Time: Approx. 13 hours for analog source via Audio-in; approx. 7 hours for digital sources via USB
- Charging Time: Approx. 1 hour 30 minutes.
To put it bluntly: The HA-2 is the real deal.
As you may know from my other articles, I frequent my local Audio Advice weekly, and sometimes up to multiple times per week.
I’m always in there demoing headphones, A/B testing, and taking notes.
Being there so often has allowed me to interact with the guys at the front desk, and more specifically a guy named Chip.
Chip is one of their Home Theater specialists, and he really knows his stuff.
On top of that,
he’s one of the most genuine, personable, and helpful people I’ve ever come across.
He’s always down to discuss audio, and it really makes me feel special when he asks ME about my opinions on stuff that has to do with the Home Studio, Headphones, Amps, etc.
We got to talking about the HA-2, and he offered to loan it to me for about a week along with the Audioquest Dragonfly Red.
Both are absolutely exemplary. The HA-2 is a bit more expensive but it’s worth every penny.
Because I said so. Just kidding. There are a couple of reasons, my friend.
- First off, the HA-2 will work with the majority of headphones, generally ranging from 16 Ohm – 300 Ohm impedance cans. So yeah, pretty much everything. 😀 What is Headphone Impedance?
- The second reason is that its output impedance is so low (less than 0.5). This also essentially means that the HA-2 will work with nearly everything you throw at it.
To give you a quick example: My Sennheiser HD600 has an impedance of 300 Ohms and a Sensitivity of 97 dB.
In short, because of its low(ish) Sensitivity, it will require more power from an Amp to reach peak loudness.
- Related: What is Sensitivity in Headphones?
How much power does the HD600 need from an amp? 20mW to be exact.
The HA-2 provides 30mW into 300 Ohm, so it just makes the cut here.
You can see that 300 Ohms is just about the ceiling for this amp. Being that I wasn’t familiar with the specs, I honestly did not think that the 600s would sound their best out of the HA-2.
I was proven wrong overwhelmingly.
Let’s get into what’s included! We’ll get into functionality in a bit.
What’s in the Box?
The Oppo HA-2 comes with:
- A Wall Wart and heavy-duty premium cable. This is the white cable.
- Short 3.5mm to 3.5mm interconnect cable.
- Micro USB to Micro USB (For Android)
- USB to Lightning (For iPhone/iPad)
- 2 Bands for your phone, etc.
- User Guide
Let’s move on to features and how this all comes together.
Features & Connections
If there were ever a jack of all trades Amp/DAC, the HA-2 would be it.
There’s a lot to this thing and it can be overwhelming at first. Thankfully it’s fairly straightforward when you delve deeper.
Let’s take a gander.
It’s got a line-out jack and a 3.5mm audio in.
The line out is labeled AB, and the audio in is labeled C.
So basically, use that 3.5mm to 3.5mm interconnect from above.
Plug one end into the line out and the other into another source like your phone or laptop. If you’re using it with your phone, switch it to A.
If you’re using your laptop, switch it to B.
C is just a straight analog in.
I don’t use 3.5mm interconnects often, but when I do… Lol. I got nothing.
If you have an Android, these are much easier to find than a Micro USB to Micro USB cable. Y
ou can also use the line out to a separate Amp if you so desire. Just grab an RCA to mini and you’re golden!
Full-Size USB port labeled “A” (for Apple)
for use with that USB to Lightning cable that we discussed earlier.
Just plug the small end into your iPhone/iPad and the big end into the HA-2.
Micro USB port labeled “B” (for Android)
for use with the Micro USB to Micro USB OTG cable. As mentioned before, these are a bit harder to find.
If for whatever reason you can’t find one and you have an Android phone, a 3.5mm interconnect will always work.
Connection to PC/MAC for use as a USB DAC.
This is what I primarily use it for.
I just plug the white cable from my laptop into the port labeled B and I’m good to go.
You will likely have to download a driver if you’re on PC, so keep that in mind.
This may seem trivial, but in reality, it’s not.
This knob feels great, and upon turning it on, it makes a satisfying click with an LED also lighting up green.
This gain switch basically enables the HA-2 to become very versatile with a wide variety of headphones.
Not only that,
but it’s got a really cool mute/fade-in function as well.
This means that you won’t blow your ears out if you forgot to turn the volume down before switching it on.
After flicking the switch, it starts off low and then gradually reaches peak loudness.
A great feature!
I find that because the bass boost is performed by analog audio circuits, it avoids re-digitization of the signal.
This results in a much cleaner and more tastefully done bass that you will immediately notice.
Some bass boosts are rather harsh and kind of sloppily implemented.
The HA-2’s feels natural and adds just the right amount of sub-bass as well as mid-bass impact to the track.
Power Check/Charge Button.
On the side,
you’ll see 4 tiny green LED lights that show the status of the charge in 25% increments.
That’s all well and good but what’s even cooler is that you can charge your phone with the HA-2!
Just use the white cable supplied.
Plug one end into the large USB port at the bottom, and plug the micro end into your phone.
Then, hold down the button on the HA2 until the 5th LED lights up Blue.
You should notice your phone’s charge meter switch over to a lightning bolt and begin charging. Another nifty feature!
The HA-2 gets 12 hours of play time as an analog amp and 7 hours as a digital DAC/Amp.
- Related: What is a USB DAC?
Take it on the go or use it on your desktop!
This switch is located at the bottom left of the unit and is important.
If you’re not hearing any sound, the switch may be set to the wrong letter.
All you have to do is make sure that it corresponds to what you’re using it for.
- A = Apple. For use with the USB to Lightning Cable, Line Out from a phone.
- B = Android. For use with the Micro USB to USB Cable, Line Out from the computer, and to charge the unit.
- C = Audio In. For use with Analog Audio Sources such as a portable music player.
With that, let’s get into the build of this thing!
This baby is about as sleek as it gets.
It’s extremely attractive and elegant looking, with a rock-solid build.
When I got my hands on it I didn’t want to ever let it go. It’s that sexy and just feels really good when you’re holding it.
It’s also got one of the most perfect volume knobs that I’ve ever had the pleasure of turning.
It makes a satisfying click when turning on and off, and is tight enough to stay in place; i.e. if you accidentally graze it, it won’t move.
If the HA-2 were a female, it would be a mature, intelligent, sexy, and ambitious woman like Keri Russell. For sure.
All of the other ports feel very solid as well.
I don’t see this unit breaking down.
Ever. There’s not much more to say.
You really know where your money went when you hold it. I even dropped it today by accident and it said “That’s all you got?” Lol.
Ergonomics & Sound
It’s one of the smoothest, crispest, most enjoyable experiences I have ever had with an Amp, but my stance on Amps in general has shifted quite a bit since I first heard this.
Still, I’ll never forget my time with the HA-2.
The gain switch as mentioned earlier enables this thing to be versatile and flexible enough for just about any headphone.
It’s got just enough power to drive an HD600, providing 30mW into 300 Ohm.
The 600s require 20mW from the amp to reach peak loudness as discussed at the start.
I’ve used it with plenty of headphones by now and there’s never been an instance of it not providing enough juice.
All in all,
the HA-2 is extremely efficient and proves to be very versatile with its ability to recruit more juice for tougher-to-drive headphones, as well as that very tastefully done bass boost.
It reaches ear-piercing levels and still sounds clean as a whistle.
I don’t ever keep it that high, but I have tested it out for a max of a couple of seconds just to see how it handled.
- Amazing build.
- Great features.
- Stunning sound.
- It did drop out on me a few times, meaning it just randomly disconnected via USB. I just unplugged and plugged back in and it was fine. Something to keep in mind. As of this 12/13/2018 update, I no longer am having issues with this.
My Video Review
With all that said, what’s my final grade for this little buddy?
There’s not much that the HA-2 can’t or won’t do.
It even brewed me a cup of coffee this morning!
All jokes aside, if you’re looking for an amp that sounds smooth as a baby bottom, comes power-packed with plenty of features and connections, is portable and versatile, and has a fantastic build, look no further.
The HA-2 is the amp for you.
Even though it’s now discontinued, I still think it’s worth at least a look on Amazon or eBay. In fact, I think it’s worth more than a look.
I think it’s still extremely relevant for an audiophile or casual consumer as well.
Well that’s about it for today folks! I hope you’ve enjoyed this Oppo HA 2 Review.
Is The HA-2 still worth a look nowadays? Let me know!!
Questions? Comments? Requests? Did I miss the mark on something? Let me know in the comments below or Contact me!! I would love to hear from you..
Until then, all the best and God bless..
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