FATfreq x HBB Deuce closeup left earphone with attached blood cable whitebox
FATfreq x HBB Deuce closeup left earphone with attached blood cable over black herringbone background
FATfreq x HBB Deuce closeup left earphone with attached blood cable Bokeh black background
FATfreq x HBB Deuce closeup high angle with attached coiled stock red blood cable on wood table
FATfreq x HBB Deuce closeup eye level with attached coiled stock red blood cable on smooth surface
FATfreq x HBB Deuce impedance adapter 4.4mm
FATfreq 4.4mm to 3.5mm adapter profile
FATfreq x HBB Deuce closeup left earphone with attached blood cable whitebox
FATfreq x HBB Deuce closeup left earphone with attached blood cable over black herringbone background
FATfreq x HBB Deuce closeup left earphone with attached blood cable Bokeh black background
FATfreq x HBB Deuce closeup high angle with attached coiled stock red blood cable on wood table
FATfreq x HBB Deuce closeup eye level with attached coiled stock red blood cable on smooth surface
FATfreq x HBB Deuce impedance adapter 4.4mm
FATfreq 4.4mm to 3.5mm adapter profile

FATfrequency x HBB Deuce | Dynamic Universal IEMs

$239.00
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Termination

FATfreq logo black

FATfreq x HBB Deuce, the Sub-Bass IEM with the Golden Combo of Punch and Rumble

single fatfreq x hbb deuce earphone with attached cable running across butcher block table

Bloom's Take

The FATfreq Deuce has arrived, the highly anticipated collaboration with HBB, also known as Bad Guy Good Audio Reviews. It sports a streamlined, professional look with glossy black housing and subtle branding, and with its sturdy yet flexible Silver 'Blood' cable, the Deuce combines premium aesthetics with a focus on comfort, durability, and incredible value for its price.

Sound wise, the IEM combines FatFreq’s signature bass power with HBB’s tuning sensibilities, delivering a deep, textured low end that satisfies bass lovers while keeping the mids and highs clear and balanced. The Deuce is an ideal choice for anyone looking for both warmth and clarity in a single IEM, and it's a standout among other popular IEM collaborations, particularly for those seeking high-quality bass with a nuanced sound profile.


Meticulously Tuned with Top Reviewer HBB

Over a year, the Deuce was meticulously tuned with top reviewer HBB, also known as Bad Guy Good Audio Reviews, undergoing multiple iterations of tuning and design. Each phase focused on refining sound clarity, depth, and dynamics. HBB's extensive collection of hip-hop, rock, and classical tracks heavily influenced the Deuce's tuning direction, with significant effort spent to ensure it excels in these genres. This dedication has resulted in an IEM that offers unparalleled audio quality and an immersive experience.

FF Custom-Designed Dynamic Chamber

FATfreq introduces a new acoustic system featuring advanced networks that meticulously manage sound wave propagation to ensure optimal clarity and precision. Specially engineered bass chambers optimize airflow, enhancing tonality and deepening bass response.

fatfreq x hbb deuce coiled blood cable highlighting 3.5mm plug

FATfreq Tech

BASS CANNON™ (Patent Pending): Using proprietary dynamic woofers, bass chambers and acoustic damping networks, FATfreq was able to design the deepest bass ever recorded of over 30dB, expertly controlled below 150Hz with zero mid-range bleed. A FATfreq innovation pioneered and perfected for sheer bass power.

SONAR LA TROMPA™: Inspired by the anatomy of the traditional french horn, FATfreq uses exponential horn curvature for gain control and to improve treble tonality via acoustics. Providing you with Smooth, natural sounding highs, grounded by a nice timbre in the mid and low frequencies.

PHASEALIGN: The absence of a DSP in IEMs means that FATfreq had to match the phase of multi-way systems via Acoustic delay. Using proprietary structures, they were able to align the low, mid and high frequencies such that they reach your eardrum in a coherent manner. Giving you the sound accuracy and resolution demanded on stage and studio.

fatfreq x hbb deuce earphones with attached red blood cable hanging over corner of amp dark

Specifications

  • Bass Cannon™ technology
  • Cable: 2-Pin (0.78) sockets
  • FATfrequency 1 Year Warranty

FATfrequency x HBB Deuce IEM measurment graph

In The Box

  • FATfreq x HBB Deuce IEM
  • Pre-order special: Silver 'Blood' cable + Bass impedance adapter

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Customer Reviews

Based on 5 reviews
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O
Ozz Sanchez
THey sound awesome

The sound its good but if you EQ them, they sound even more awesome

J
Jonathan Danucalov

Pleasantly surprised with how Fatfreq was able to create such an amazing IEM with deep bass rumble and yet a nearly perfect mid and high resolution. Fantastic IEM, I feel like I'm listening to my library for the first time again.

S
Simon Ash
HBB Deuce

Super satisfied with these iem! They are more than one could wish for at this price point. Perfect for those who prefer a little more bottom end.

R
Richard Hurlebaus
Like being in the Blue Note club

I listen mostly to my Jazz station on Live One app. Though I'll also try with BSO live broadcasts on Classical.org. These are by far the best IEMs in my meager collection. I'm using them through a Shanling UA3 from a Google Pixel 8. Thank you Bloom, FF and HBB!

B
Brian Morris
This is gonna be one of the greats…

So today someone at the Post Office dropped a Deuce in my mailbox and I’m not mad about it.

So for context I do own bot Maestro Mini and Scarlet Mini sets as well as the iKKo OH10 and BLON BL-03. However I wouldn’t call myself a basshead, I favor clean midrange and to have as much detail as humanly possible. I don’t care about the sound signature as long as it delivers midrange and as much details as they can.

This set is not a replacement for Maestro Mini or Scarlet Mini…it’s really close though. I can’t believe I’m saying this but those two sets have a smidge more treble extension than the Deuce. Likely due to the BA’s, but the midrange is definitely identical in my perception.

The bass is just as egregious and big..BIG.!! Without bleeding into the mids. The Mini’s do have a few more technical attributes in detail, seperation and layering. The tone and toe tapping fun is equally as good though, but not superior. My preorder came with the impedance adapter and that just makes the set feel more like a light Scarlet Mini. What the impedance adapter does do is slightly and I mean slightly…I perceive it to pillow the bass texture.

This set likes POWER…fortunately I ordered the balanced version. Now I don’t run desktop setups, because I don’t listen to IEM’s at a desk. I’m mobile with my IEM’s so that means my dongle DAC’s.

My 4.4mm favorite's were the FiiO BTR7, FiiO KA15, Shanling UA3, Questyle M15, Lotoo PAW S2 and the teenie tiny ddHiFi TC44 Pro M2 Gen3.1. My least favorite was the Moondrop Moonriver 2:Ti it was thin..paper thin. The okay but not great probably too warn, but they are the ifi GoBar Kensei and Cayin RU7.

I converted the 4.4mm to a 2.5mm to run the Hidizs S9 Pro same as the Moondrop it was thin. I also used some single ended guys too. Audioquest Dragonflies Cobalt and Red were good, but you’re pushing more than half the volume. The THX Onyx no problem best in my opinion for this set in single ended. The Questyle M12 was capable but again pushing about 70% so little headroom to play with.

Now music……

So it playback of 90’s R&B was amazing and most of that decades Hip Hop too. The piano melody of Blackstreet No Diggity was perfect.

Chaotic music such as heavy metal wasn’t bad just not as good as the Mini’s presentation. NuMetal however such as Linkin Park, Slipknot and Modern Marilyn Manson…great.

Pop music was good if you don’t really know the highs of the tracks in detail. K-Pop was presented well. Multi singer groups I could identify the individual artists in each song well enough. The bass.in Blinding Lights by The Weeknd came across natural and pleasing. His duet with Ariana Grande in Save My Tears was clean.

Rock music…Queens of the Stone Age felt congested and veiled, but Tool “The Pot” slammed hard..ROCK HARD.!!! Now 80’s hair metal was pretty cool on this set.

Now some civilized music. The strings and brass section in A Change is Gonna Come by Sam Cooke….mmm chefs kiss. In the track Move on Up by Curtis Mayfield I was able to hear the pianos which is very faint even on reference sets.

The shell is larger than the Mini’s, but that just means it’s average. I so prefer the deeper fit of the Maestro and Scarlet Mini’s though.

The Deuce is 85% of the Maestro Mini and with the impedance adapter it’s 90% Scarlet Mini. Best entry point to buy into the FatFreq family. The case however is micro machine size. It’s gonna be a tight fit if you also wanna carry your adapter. I will likely order the FatBox on FatFreq site.

No Ragrets on purchasing this. I would do it again. It’s inexpensive enough to even be a gift, that’s if you’re gift budget is near $300.

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