HELM DB12 AAAMP review: Boost your headphone audio with this THX-certified amp

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Techaeris Rated 8.8/10

One of the most subjective things in the world is music. Not only in choice of music but in how people prefer the actual audio itself. One thing is for certain: more people are enjoying their music while on the go. Unfortunately, some headphones, while comfortable, may not offer the best sound. That’s where portable headphone amplifiers come in.

Estimated reading time: 7 minutes

Our HELM DB12 AAAMP review looks at a portable, THX-certified, mobile headphone amplifier that not only boosts your audio levels but improves music quality if you have the right source material. Read on for our full review!


The HELM DB12 AAAMP we reviewed has the following features and specifications:

AmplifierTHX’s AAA Amplifier – THX Certified
Gain+12 dB (full range)
Independent bass boost+6dB on 60-100 Hz frequencies
Frequency response+0.01/-0.2 dB 20Hz – 20kHz with 32 ohm load
Output power• 109 mW at 16 ohms with <0.1% THD (watts per channel)
• 111 mw at 32 ohms with <0.1% THD (watts per channel)
Output impedance< 0.4 ohms
Crosstalk-91 dB, 10K ohms: 0.0028184%
Noise (A-wt)10 uV, potentiometer at nil
SNR114 dB, 3000 ohms, <1% THD
Harmonic distortion• THD: -102dB, 16 ohms, 10 mW: 0.0008%
• THD: -102dB, 32ohms, 5 mW: 0.0008%
• THD: -109dB, 10 Kohms, 0.0496 mW: 0.00035%
Intermodulation distortion• THD: -70dB, SMPTR 70 Hz + 70 kHz, 16 ohms: 0.03%
• THD: -80dB, SMPTR 70 Hz + 70 kHz, 32 ohms: 0.01%
• THD: -80dB, SMPTR 70 Hz + 70 kHz,10K ohms: 0.01%
CableCustom Shielded Silver Cable with Molded Strain Relief
InputStereo TRRS 3.5mm male connector
OutputStereo TRRS 3.5mm female connector
Power supplyInternal USB rechargeable battery
Battery life6+ hours in use
Charge time2.5 hour fast charge
Dimensions2.75 x 0.86 x 0.47″ (70 x 22 x 12mm) with 24″ cable to device and 2″ cable to headphones
Weight1.08 oz (30.55g)
Warranty1 year

What’s in the box

  • USB-C cable
  • Soft Carrying Bag
  • Quickstart guide
What's included with the HELM DB12 AAAMP mobile headphone amplifier
What’s included with the HELM DB12 AAAMP mobile headphone amplifier.


The DB12 AAAMP by HELM Audio has a pretty basic design. The main unit is a roughly 2.75 x 0.86 x 0.47″ aluminum box. It has three inline control buttons on the top (-, multi-function, and +). One edge has a switch for off, on, and bass+. The other edge has a USB Type-C port for charging. On the bottom is the HELM Audio logo as well as the THX logo. While on the smallish side, it is a bit bulky feeling.

One end of the main unit has a 2″ cable ending in a female 3.5mm audio connector. The other has a 24″ cable ending in a male 3.5mm audio connector. The cable is nicely braided but stiffer than you’d expect. This is because it has “molded strain relief,” presumably to help keep the cable inside from kinking up. While it’s nice to have such a long cable on one end, and understandably so you have the inline controls handy, it does add quite a bit of length to your headphones or earbuds.

The inline controls and volume switch on the HELM DB12 AAAMP mobile headphone amplifier
The inline controls and volume switch on the HELM DB12 AAAMP mobile headphone amplifier.

HELM has also included a soft carrying pouch, albeit a bit large. With a faux leather finish and nice stitching across the top, it opens easily be squeezing the edges together. There is more than ample room for the amplifier, charging cable, and manual within the pouch. As for branding, the HELM Audio logo is stamped into the front of the pouch.

Ease of Use

The HELM DB12 AAAMP is simple to use. Charge it up, plug one end into the 3.5mm jack on your smartphone, laptop, computer, or another device, then plug your headphones into the other end. Flick the switch to ON to get 12dB of volume gain. Move the switch to the Bass+ position to get an extra 6dB of bass boost.

Pressing the – button on the top lowers the volume while pressing the + button increases the volume. Pressing the middle button once plays/pauses the current track, a double tap goes to the next track, and a triple tap goes to the previous track. This was a bit hit and miss as on one smartphone the triple tap didn’t work, but worked fine on two other smartphones. When used with two different laptops, the inline controls didn’t work at all, but the manual does warn that they may not.

Sound Quality

When plugged into the HELM DB12 AAAMP with it switched on, you’ll easily notice the 12dB increase in volume. Turn it to Bass+ mode and the extra 6dB of bass boost is equally noticeable. If you’re an average music listener, the easiest way to explain this is that with this portable amp, your volume at 25% on your smartphone might be equal to maximum volume without the amp in place (or turned off).

The HELM DB12 AAAMP mobile headphone amplifier with female connector end
The HELM DB12 AAAMP mobile headphone amplifier with female connector end.

The DB12 AAAMP shines a bit with it’s THX-certified output more if you listen to original recordings, either through FLAC files or subscribe to streaming services like TIDAL that offer master recordings. With a regular pair of headphones or earbuds, your audio may sound decent enough, but with the THX-certified sound of this portable amp, you can definitely hear more of how the artist intended from their music.

It didn’t seem to matter which wired headphones I tested this with, from my favourite earbuds — the Creative Aurvana Trio — to the Razer BlackShark V2 and everything in between. In each case, the headphones benefited from a volume boost (whether it was needed or not), as well as a bass boost. When listening to TIDAL Master tracks and toggling the amplifier on and off, the difference in balance and audio quality was also apparent across the board.

Battery Life

With a stated battery life of around 6 hours, you’re definitely not going to get through an entire day or a long trip on a single charge. During testing, we were able to get close to 6 hours with the bass boost on. Charging does take about 2 1/2 hours if charged via USB-C and a fast charging adapter. My typical usage during testing consisted of about 3 1/2 to 4 hours of use in the morning, charging over lunch, then 3 1/2 to 4 hours of use in the afternoon before charging it overnight. In that scenario, I never ran out of battery life while using it. Still, it’d be nice if the unit came with at least 8 hours of battery life for those longer trips or air travel depending on where you are going.

When low on battery, the LED beside the charging port will turn red. When charging, it turns green and when fully charged the light will turn blue.

The charging port on the HELM DB12 AAAMP mobile headphone amplifier
The charging port on the HELM DB12 AAAMP mobile headphone amplifier.


With an MSRP of US$179.99, the HELM DB12 AAAMP isn’t exactly cheap. While it does amplify your existing headphones, there are headphones coming on the market that do offer up THX sound for around that price or slightly more. Still, if you have that favourite set of headphones you don’t want to get rid of, the DB12 AAAMP will boost your sound output and quality.

While most people won’t notice too much of a difference besides the sound output increase, the difference is there if you’re subscribed to services like TIDAL that offer up master recordings. If your current headphones lack in the output department or if you are an audiophile, this portable amp definitely offers up some listening value. If your current headphones are loud enough and you don’t listen to master recordings, you likely won’t find the value with this device.

That said, at the time of this review, the DB12 AAAMP is currently on sale for $149.99 on both the HELM Audio website and Amazon.


The HELM DB12 AAAMP is a portable amp that is versatile and adds extra THX-certified sound to your existing headphones if you’re an audiophile or need the volume boost.

In some of our articles and especially in our reviews, you will find Amazon or other affiliate links. As Amazon Associates, we earn from qualifying purchases. Any other purchases you make through these links often result in a small amount being earned for the site and/or our writers. Techaeris often covers brand press releases. Doing this does not constitute an endorsement of any product or service by Techaeris. We provide the press release information for our audience to be informed and make their own decision on a purchase or not. Only our reviews are an endorsement or lack thereof. For more information, you can read our full disclaimer.

Last Updated on April 6, 2021.


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