Name: FATfrequency x Effect Audio Quantum | Universal Planar IEMs
Brand: FATfreq
SKU: FF-QUANTUM-BATCH1
Price: 759.0 USD
Availability: InStock

FATfreq x Effect Audio Quantum IEMs front and rear view whitebox

FATfreq x Effect Audio Quantum iems sitting on top of wrapped Ares S II cable on blue/purple backdrop

FATfreq x Effect Audio Quantum iems front and back view closeup with ear tips on sitting on black background

FATfreq x Effect Audio Quantum iems ares s ii cable termination close up

$759.00

Condition

New

Open Box

Experience Unrivaled Speed and Clarity with the FATfreq x Effect Audio Quantum Planar Magnetic IEM

14.2mm ultra-fast planar driver with FATfreq's proprietary ResoFlow™ Acoustic System
Noah modules allow for low frequency tweaking: greater physical bass slam or stronger low-end control
Precise imaging and expansive soundstage
Exclusively tuned with the Ares S II from Effect Audio's Signature Series II
First Batch Special includes full Noah Module set: Black(Power) + Blue(Control) + SuperStage

FATfrequency x Effect Audio Quantum iems wrapped with cable sitting on metal case next to lid with logo on black satin background

FATfreq x Effect Audio: Quantum

Experience a new level of control and precision with Quantum, a high-performance in-ear monitor featuring Planar Driver Technology and detachable Noah modules, allowing fine-tuned customization of Basscannon™ technology for a tailored low-frequency response.

Quantum Precision: Expansive, Lifelike Sound

Quantum’s Planar Driver Technology delivers ultra-fast transients, precise imaging, and an expansive soundstage, creating a lifelike sense of depth and space that enhances musical immersion. The tuning ensures a natural midrange, extended treble response, and highly resolving presentation, making it ideal for those seeking accuracy, flexibility, and dynamic realism.

ResoFlow™ Acoustic System

FATfreq's proprietary ResoFlow™ Acoustic System combines a precision-tuned resonator with a reverse exponential horn waveguide. This technology gradually guides high frequencies from the planar driver mouth through a carefully tapered acoustic pathway, ensuring a controlled and effortless treble presentation.

SuperStage Module

At the core of Quantum’s customizability lies the Noah Module System, an innovative modular tuning feature designed for versatile sound shaping. Included with Quantum is FATfreq's newly innovated SuperStage Noah Module, the same breakthrough acoustic module used in their flagship Grand Maestro.

FATfrequency x effect audio quantum iems superstage noah module closeup

This module expands the perceived soundstage, creating an immersive, holographic experience that places instruments and vocals with breathtaking spatial accuracy. Whether you're in the studio, on stage, or simply enjoying music, the SuperStage Noah Module transforms the listening experience by providing an unparalleled sense of openness and depth.

Effect Audio Ares S II Cable

In collaboration with Effect Audio, Quantum has been exclusively tuned with the Ares S II from Effect Audio's Signature Series II. The Ares S II is the world's first solid core 8-wire handwoven IEM cable, enhancing signal integrity and conductivity to deliver noticeable improvements in clarity and detail. Its proprietary Dual Variant QuantumCopper™ design blends two distinct types of copper, resulting in richer sub-lows, a stronger bass kick, and thick, alluring vocals.

FATfrequency x effect audio quantum iems Ares S II cable coiled sitting on black background

The stock cable included with Quantum is the Ares S II in ConX 0.78 2-pin connectors & 4.4 balanced termination, ensuring that users experience the full potential of this meticulously engineered partnership.

Specifications

Driver Counts: 14.5 Single Planar Magnetic Driver. Dual vent technology + Noah Technology + Basscannon Technology
Crossover: Full Range Driver
Impedance: 38Ω
Frequency Response: 20Hz-45kHz
Cable: Effect Audio Ares S II
Termination: 4.4mm balanced, ConX 2-pin
FATfreq 1 Year Warranty

In the Box

FATfreq x Effect Audio Quantum IEMs
Hard case
S/M/L Silicone ear tips
IEM cleaning tool

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Detailed, Bassy, with Slam

When I saw that FatFreq was releasing a planar, I acted in an unusual manner—and bought the introductory kit without so much as a frequency response published! I was not disappointed! I was betting they were applying their known skills at taming treble and boosting bass to this unit. I was correct. Though a planar (and I have some other brands) this baby has bass slam! It has sparkling and fast highs, excellent mids, and prodigious bass. You would never figure this was a plana…except for the fact that it is also highly resolving. The large spatial enhancing NOAH module actually works, giving it a massive sound stage. If you are a bass head, you will be happy. But even if not, you will be happy! This is now my main IEM, with the Monarch mk3, 64Audio u12T and even the Crimson available to me. It is that good! At this price it is a steal, sounds like a IEM priced well above $1,000. Thanks for carrying the brand, Bloom. The demand internationally is so high, it will be months to get one direct from Singapore. Very satisfied.

Exceptional build quality.

The FatFreq x Effect Audio: Quantum offers impressive sound quality and exceptional build quality, but with some comfort limitations for extended listening sessions. Great detail retrieval. Whether I’m listening to classical, rock, electronic, or jazz, the Quantum performs admirably across genres, making them a versatile daily driver. would like to see more documentation/instruction in the package. Specifically about the modules and the effect they achieve.
Recommended for: Audiophiles seeking detailed, bass-rich IEMs with premium build quality who listen in shorter sessions and value versatility across musical genres.
Consider alternatives if: Long-term comfort is your primary concern or you specifically need IEMs with longer nozzles for your ear anatomy.

Is it worth it?

The clarity, bass, and the Noah modules bring a lot to the table.

My favorite Noah module has to be their new soundstage to give me more of what I'm looking for when it comes to different genres. It is a very well rounded set that didn't disappoint in this blind buy.

Love the case and cable paring with these. I'm a big fan of Effect Audio with the quality of cable they make with how versatile they can be.

Yes, it is worth the price tag. You also won't have to worry about treble fatigue which is always a plus for me.

FATfrequency x Effect Audio Quantum | Universal Planar IEMs