Fiio A3 - Portable Headphone Amplifier (Black)

Model #A3B

Fiio Warranty
Fiio a3b 1
Fiio a3b 1
Fiio a3b 2
Fiio a3b 3
Fiio a3b 4
Fiio a3b 5
Fiio a3b 6
Fiio a3b 7
How it works
  • You name the price you want to pay for a product.
  • We send your offer to a network of Certified Retailers.
  • If the retailer likes your offer, you get that price for the product.
Greentoe Guarantee
  • All Products are New and from Manufacturer Authorized Retailers
  • 30 day return policy
  • Free Shipping
    No Additional Fees

Product Unavailable

We are sorry. At this time, we are not accepting offers on this product.


Packaging Info

Package Weight 0.5 lb
Box Dimensions (LxWxH) 5.2 x 5.2 x 1.0"

Input1/8" (3.5 mm) stereo aux

Gain GAIN=L: Sensitivity = 2.4 V
GAIN=H: Sensitivity = 0.8 V
Output 1/8" (3.5 mm) stereo headphone
Volume Control ALPS potentiometer
Frequency Response 20 to 20,000 Hz
Crosstalk ≥ 72 dB (Gain=H)
Signal to Noise Ratio > 108 dB
THD 0.004% at 1,000 Hz
Channel Imbalance
Power Supply Mini USB Port
Balance Control GAIN=L: Balance = 0.3 dB
GAIN=H: Balance = 0.2 dB
Operating Time Up to 16 hours
Power Input 5 VDC at 500 mA
Input Impedance 16 to 150 Ω
Output Impedance
Output Power 270 mW (32 Ω)
450 mW (16 Ω)
Output Current Limit 92.6 mA
Output Voltage 8.67 Vp-p
Dimensions 3.59 x 2.20 x 0.51" (91.2 x 56.0 x 13.0 mm)
Weight 3.2 oz (92 g)
Battery Capacity 1400 mAhH
Charging Time 4 hours
User Reviews
21 December 2013

Provided enough power to make smartphones actually viable for portable listening on good headphones, This was a nice amp while it worked. The jack (output) started to lose a side in a few months of ownership (keep in mind I use headphones with a long heavy cable).

9 December 2013

Excellent little amp. I bought to replace my also excellent but a bit too weak E6, and was not disappointed. I love having a physical gain knob over buttons or sliders. However, -1 star because it sometimes refuses to turn on until you reseat the battery.

19 October 2013

I've tried this booster, that booster, etc. etc.,I am extremely pleased with the E-11. I played drums in a Rock band in the 80's, so I'm kinda deaf. I wore my new Sony headphones and the E-11 and took my motorcycle on the 405!! I could hear GREAT! and I still heard the Firetruck siren!!

9 December 2012

This is a great little amp! I was more than pleasantly surprised after plugging my ATH-M50s into this. I wasn't expecting much improvement due to the headphones low impedance BUT this little amp makes a HUGE difference. It's great with an Ipod Classic and a line out adapter.

8 August 2013

I found this unit to be astounding. I paired it with a 7th gen iPod Classic, along with FiiO's own line-out adapter for iPods. The cable included with the unit wasn't quite long enough for what I wanted to do, so I made my own. I attached this unit to the back of the iPod with two pieces of Velcro.

2 August 2017

Good quality cable that can not be used with the casing.

1 August 2017

Purchased this to increase the volume output whilst using the AUX in my 2006 Range Rover Sport with Harman Kardon, which it does very well indeed as I'm now able to use the same volume level as the other sources such as CD, instead of having to turn the volume significantly higher.

1 August 2017

Very nice little headphone a treat.

4 July 2017

Used with an iphone 6 not really that much of an improvement in volume levels from the phone itself, bass boost is reasonable but not great, a bit disappointing really for the price.

24 June 2017

I've had the Fiio A3 headphone amp over a year or so now and use it with my Bose QC25's and my Shure SE535 iems. I have to say it's been a year of listening pleasure whatever I've been listening too, this little amp is remarkable with what it can produce, the treble is clean, bass is beautiful and...

Product Highlights
  • 450 mW at 16Ω Power Output
  • Fully Discrete Bass Boost Circuit
  • Approximately 16 Hour Run Time
  • 1400 mAh Rechargeable Battery
  • 20 to 20,000 Hz Frequency Response
  • All-Aluminum Alloy Body
  • Shields Against EM Interference
  • OPA1642 Voltage Pre-Amplifier
  • AD8397 Power Amplifier
  • Low - High Gain Toggle Switch
Still Have Questions?
We can help via Live Chat, Email or you can call us 1-888-840-0464


Please log in or sign up to continue


Validating Credit Card...

It will not be processed until the offer is accepted by a merchant.

Notifying Retailers...

Notifying our merchants and checking to see if they accept this offer.

Offer Submitted!

3-digit code in the back of your credit card