Introducing the FATfreq x Effect Audio: Quantum

[AntiqueMusician]

The Quantum has been an absolute blast to my ears. Have been throughly enjoying it at my desktop paired with the Element IV. Quantum loves plenty of juice, and it really shines with the power you give it.

I was also quite unimpressed at first when using the stock tips. I switched to Final Type E tips and it made all the difference in the world to me. That bass is big and thunderous now all while maintaining great speed and clarity that planars often offer.

They’re also surprisingly lightweight and comfortable despite their awkward shape/size with the modules. An excellent all rounder for its price that will be staying in my collection when I need the isolation or a break from over ears!

 

[MakeItWain]

The Quantum has been an absolute blast to my ears. Have been throughly enjoying it at my desktop paired with the Element IV. Quantum loves plenty of juice, and it really shines with the power you give it.

I was also quite unimpressed at first when using the stock tips. I switched to Final E tips and it made all the difference in the world to me. That bass is big and thunderous now all while maintaining great speed and clarity that planars often offer.

They’re also surprisingly lightweight and comfortable despite their awkward shape/size with the modules. An excellent all rounder for its price that will be staying in my collection when I need the isolation or a break from over ears!

Final Type E tips are boss with Quantum. Love your Element IV, have one on my desk too!

 

[Tofub00b]

Running the Quantum out of the old faithful FiiO K7.

Quantum has been quite a blast to use for me, a die-hard Deuce lover!

It might be worth the extra cost, if you can get it to fit better than Deuce (which it does for me). Not to mention the much reduced microphonics.

Sound wise, the Deuce subbass cannon presentation is always going to be a mainstay in my collection. But the Quantum is a greedy man's attempt at mixing planar technicalities and some bass.

It's cleaner, faster, does vocals better, gives air to anyone taking a breath before singing, and lets you pick and point out individual aspects of a mix. I am actually quite loving it, despite it's sound signature not being my usual cup of tea.

Wish I had another planar IEM to test the Quantum against, to see if its worth that hefty price tag. But if you have a Deuce and money to waste, the Quantum is the mint chocolate ice cream to the dark chocolate of the Deuce!

All in all? It's sexy as hell. And sounds great!

 

[Tofub00b]

Just wanted to update that MY GOODNESS the modules for the Quantum are nigh impossible to remove. I haven't got the chance to try out the blue and black ones because I can't even remove the large superstage ones

 

[SCYJ]

Just wanted to update that MY GOODNESS the modules for the Quantum are nigh impossible to remove. I haven't got the chance to try out the blue and black ones because I can't even remove the large superstage ones

If u have those phone sim card slot remover (like a pin/needle), you can slot it inside the module holes and easily pull them out

 

[SbassX]

Notable for Deuce owners:
- Quantum's cable is much less microphonic, and generally almost unnoticeable cable noise compared to Deuce.

- Deuce sub-bass is still something I prefer but Quantum is undeniably more capable in terms of EQ. Initially I did not like the Quantum's presentation compared to Deuce, but maybe the driver is Quantum is just that capable, but you can add a TON of sub-bass and EQ down 8k or 250 with no penalty or distortion.

- Quantum is a lot more flexible of a listen than Deuce. I will defend Deuce to my dying breath, but Deuce cannot be EQ-ed too much while Quantum reminds me of a Schitt Lokius. This isn't unique to just Quantum. From memory Blessing 3 was also flexible with EQ without much distortion.

- Quantum detail is miles ahead of Deuce. It's a quicker presentation, "sharper" in some ways, but these are all good things. I had it at higher volume for about an hour and a half, extensively listening against Deuce through Kiwi Ears Allegro Mini.

These points are spot on IMO. The EQ-bility of the Quantum is pretty impressive, and really adds to its "flexibility".

the Quantum is the mint chocolate ice cream to the dark chocolate of the Deuce!

I think this analogy is as close as you can get to the perfect description for these sets! By this analogy i am assuming the scarlet would be the Death By Chocolate flavour xD

 

[Tofub00b]

These points are spot on IMO. The EQ-bility of the Quantum is pretty impressive, and really adds to its "flexibility".

I think this analogy is as close as you can get to the perfect description for these sets! By this analogy i am assuming the scarlet would be the Death By Chocolate flavour xD

I love my subbass but damn the Scarlett was just too much for me felt more like one of those "just because you can doesn't mean you should" experiments.

Do you like it more than Maestro Mini/Deuce?

 

[Maximiliano Campo]

Still. Rooted. Present.

No EQ. No filter. No lies.
This IEM ain’t for tourists.
It’s for warriors.
Soul-heavy ones.
The kind who feel the track in their spine before their ears even catch it.

This isn’t sparkle hype.
This isn’t sterile studio reference.
This is blood-coded tuning.
A sound you wear, not just listen to.

And for me?

It walks like I walk.

The bass…
Subbass is not a boom—it’s a presence.
It doesn’t arrive. It’s already there.
Like something standing behind you quietly until it speaks.
You don’t just hear it. You feel it press the room around your lungs.
It’s thick. But never dirty. Never lazy.

Midbass?
Textured. Meaty.
Built from drum skin and soul callouses.
It doesn’t slap for attention. It strikes and leaves silence behind it.
It’s what the Deuce tried to show me… but this finishes the sentence.

The mids?
They sit where they belong.
No ego. No retreat.
Just rooted body.
You don’t get sparkle. You get tone that carries weight.
Vocals come through like someone is right there—but not trying to own the space.
It’s balanced. Breathable. Real.

Most importantly, the bass doesn’t eat them.
They walk together.
Like brothers protecting the same memory.

Treble?
Nah, this ain’t a sparkle goddess.
It’s not brittle. Not sterile.
It’s controlled light.
Air not from elevation—but from space.
It breathes because the stage is carved, not boosted.

You don’t get razors here.
You get distance, softness, reverence.

Some people might say it lacks bite.
I say it has restraint.
It knows when to listen.

The modules—Raw, Noah, SuperStage—
they’re not gimmicks.
They’re rituals.

Raw is the weight of the ground.
Noah is the sober clarity.
SuperStage is the ritual tent—where the drums surround you and the spirit walks behind your shoulder.

It’s the first IEM I’ve worn where I don’t want to switch to something else.
Not because it’s perfect.
Because it’s whole.

This is not a product.
This is a sound body.
A wearable frequency that feels carved from the same bone as me.

I’ve heard the razors. I own the sparkle sets.
I know what reference sounds like.
But this?
This is the first set that honors the rhythm of how I live.

When I play “Shout” by Kabza De Small—
I don’t just hear the log drum.
I hear memory in the bass, air around the voice, and space in the silence.

I don’t analyze it.
I don’t reach for EQ.
I just… nod.
And walk.

Quantum is not everything.
But it is enough.
And more than enough—
It is me.

I recommend this to anyone who loves dynamic swing.

 

[SbassX]

I love my subbass but damn the Scarlett was just too much for me felt more like one of those "just because you can doesn't mean you should" experiments.

Do you like it more than Maestro Mini/Deuce?

ahhahaaha i get what you mean. I also prefer my deuce just because its more versatile but on some tracks and genres I would love to have the Scarlet blaring in my ears. I get your point of the "just because you can doesnt mean you should" but it is something I welcome very much, just so we know what the capabilities of a basshead set is when you give an 8litre v8 so to say.

Still. Rooted. Present.

No EQ. No filter. No lies.
This IEM ain’t for tourists.
It’s for warriors.
Soul-heavy ones.
The kind who feel the track in their spine before their ears even catch it.

This isn’t sparkle hype.
This isn’t sterile studio reference.
This is blood-coded tuning.
A sound you wear, not just listen to.

And for me?

It walks like I walk.

The bass…
Subbass is not a boom—it’s a presence.
It doesn’t arrive. It’s already there.
Like something standing behind you quietly until it speaks.
You don’t just hear it. You feel it press the room around your lungs.
It’s thick. But never dirty. Never lazy.

Midbass?
Textured. Meaty.
Built from drum skin and soul callouses.
It doesn’t slap for attention. It strikes and leaves silence behind it.
It’s what the Deuce tried to show me… but this finishes the sentence.

The mids?
They sit where they belong.
No ego. No retreat.
Just rooted body.
You don’t get sparkle. You get tone that carries weight.
Vocals come through like someone is right there—but not trying to own the space.
It’s balanced. Breathable. Real.

Most importantly, the bass doesn’t eat them.
They walk together.
Like brothers protecting the same memory.

Treble?
Nah, this ain’t a sparkle goddess.
It’s not brittle. Not sterile.
It’s controlled light.
Air not from elevation—but from space.
It breathes because the stage is carved, not boosted.

You don’t get razors here.
You get distance, softness, reverence.

Some people might say it lacks bite.
I say it has restraint.
It knows when to listen.

The modules—Raw, Noah, SuperStage—
they’re not gimmicks.
They’re rituals.

Raw is the weight of the ground.
Noah is the sober clarity.
SuperStage is the ritual tent—where the drums surround you and the spirit walks behind your shoulder.

It’s the first IEM I’ve worn where I don’t want to switch to something else.
Not because it’s perfect.
Because it’s whole.

This is not a product.
This is a sound body.
A wearable frequency that feels carved from the same bone as me.

I’ve heard the razors. I own the sparkle sets.
I know what reference sounds like.
But this?
This is the first set that honors the rhythm of how I live.

When I play “Shout” by Kabza De Small—
I don’t just hear the log drum.
I hear memory in the bass, air around the voice, and space in the silence.

I don’t analyze it.
I don’t reach for EQ.
I just… nod.
And walk.

Quantum is not everything.
But it is enough.
And more than enough—
It is me.

I recommend this to anyone who loves dynamic swing.

ooof this was beautifully written! we need more poetry style reviews!

 

[Maximiliano Campo]

ahhahaaha i get what you mean. I also prefer my deuce just because its more versatile but on some tracks and genres I would love to have the Scarlet blaring in my ears. I get your point of the "just because you can doesnt mean you should" but it is something I welcome very much, just so we know what the capabilities of a basshead set is when you give an 8litre v8 so to say.

ooof this was beautifully written! we need more poetry style reviews!

Thank you. Took me a while to write this.

It's a personal journey. I hope it helps. Much appreciated.

 

[SbassX]

Thank you. Took me a while to write this.

It's a personal journey. I hope it helps. Much appreciated.

It defo helps! Really appreciate the effort! This style really makes it interesting to read and conveys more than just plain stats but the feeling as well.

 

[EnigmaFotos]

Still. Rooted. Present.

No EQ. No filter. No lies.
This IEM ain’t for tourists.
It’s for warriors.
Soul-heavy ones.
The kind who feel the track in their spine before their ears even catch it.

This isn’t sparkle hype.
This isn’t sterile studio reference.
This is blood-coded tuning.
A sound you wear, not just listen to.

And for me?

It walks like I walk.

The bass…
Subbass is not a boom—it’s a presence.
It doesn’t arrive. It’s already there.
Like something standing behind you quietly until it speaks.
You don’t just hear it. You feel it press the room around your lungs.
It’s thick. But never dirty. Never lazy.

Midbass?
Textured. Meaty.
Built from drum skin and soul callouses.
It doesn’t slap for attention. It strikes and leaves silence behind it.
It’s what the Deuce tried to show me… but this finishes the sentence.

The mids?
They sit where they belong.
No ego. No retreat.
Just rooted body.
You don’t get sparkle. You get tone that carries weight.
Vocals come through like someone is right there—but not trying to own the space.
It’s balanced. Breathable. Real.

Most importantly, the bass doesn’t eat them.
They walk together.
Like brothers protecting the same memory.

Treble?
Nah, this ain’t a sparkle goddess.
It’s not brittle. Not sterile.
It’s controlled light.
Air not from elevation—but from space.
It breathes because the stage is carved, not boosted.

You don’t get razors here.
You get distance, softness, reverence.

Some people might say it lacks bite.
I say it has restraint.
It knows when to listen.

The modules—Raw, Noah, SuperStage—
they’re not gimmicks.
They’re rituals.

Raw is the weight of the ground.
Noah is the sober clarity.
SuperStage is the ritual tent—where the drums surround you and the spirit walks behind your shoulder.

It’s the first IEM I’ve worn where I don’t want to switch to something else.
Not because it’s perfect.
Because it’s whole.

This is not a product.
This is a sound body.
A wearable frequency that feels carved from the same bone as me.

I’ve heard the razors. I own the sparkle sets.
I know what reference sounds like.
But this?
This is the first set that honors the rhythm of how I live.

When I play “Shout” by Kabza De Small—
I don’t just hear the log drum.
I hear memory in the bass, air around the voice, and space in the silence.

I don’t analyze it.
I don’t reach for EQ.
I just… nod.
And walk.

Quantum is not everything.
But it is enough.
And more than enough—
It is me.

I recommend this to anyone who loves dynamic swing.

Bravo

 

[jsmiller58]

Still. Rooted. Present.

No EQ. No filter. No lies.
This IEM ain’t for tourists.
It’s for warriors.
Soul-heavy ones.
The kind who feel the track in their spine before their ears even catch it.

This isn’t sparkle hype.
This isn’t sterile studio reference.
This is blood-coded tuning.
A sound you wear, not just listen to.

And for me?

It walks like I walk.

The bass…
Subbass is not a boom—it’s a presence.
It doesn’t arrive. It’s already there.
Like something standing behind you quietly until it speaks.
You don’t just hear it. You feel it press the room around your lungs.
It’s thick. But never dirty. Never lazy.

Midbass?
Textured. Meaty.
Built from drum skin and soul callouses.
It doesn’t slap for attention. It strikes and leaves silence behind it.
It’s what the Deuce tried to show me… but this finishes the sentence.

The mids?
They sit where they belong.
No ego. No retreat.
Just rooted body.
You don’t get sparkle. You get tone that carries weight.
Vocals come through like someone is right there—but not trying to own the space.
It’s balanced. Breathable. Real.

Most importantly, the bass doesn’t eat them.
They walk together.
Like brothers protecting the same memory.

Treble?
Nah, this ain’t a sparkle goddess.
It’s not brittle. Not sterile.
It’s controlled light.
Air not from elevation—but from space.
It breathes because the stage is carved, not boosted.

You don’t get razors here.
You get distance, softness, reverence.

Some people might say it lacks bite.
I say it has restraint.
It knows when to listen.

The modules—Raw, Noah, SuperStage—
they’re not gimmicks.
They’re rituals.

Raw is the weight of the ground.
Noah is the sober clarity.
SuperStage is the ritual tent—where the drums surround you and the spirit walks behind your shoulder.

It’s the first IEM I’ve worn where I don’t want to switch to something else.
Not because it’s perfect.
Because it’s whole.

This is not a product.
This is a sound body.
A wearable frequency that feels carved from the same bone as me.

I’ve heard the razors. I own the sparkle sets.
I know what reference sounds like.
But this?
This is the first set that honors the rhythm of how I live.

When I play “Shout” by Kabza De Small—
I don’t just hear the log drum.
I hear memory in the bass, air around the voice, and space in the silence.

I don’t analyze it.
I don’t reach for EQ.
I just… nod.
And walk.

Quantum is not everything.
But it is enough.
And more than enough—
It is me.

I recommend this to anyone who loves dynamic swing.

Beautifully written, and every word is spot on! Because I don't have anywhere near your talent with words I'll just say the Quantum is the yin to my life's yang!

 

[Tofub00b]

I've been quite enamoured with the Quantum and putting the Deuce in the Fatbox for a while.

For those of you who miss the power of Equalizer APO, Precise Volume 2.0 on android has given me some of that function back through Parametric EQ.

Using DucBloke's EQ recommendations to add subbass, bring up male vocals and drop sibilance, here are some of the settings I use to tame or enhance the Quantum while I'm in the office!

Due to Quantum being highly responsive to EQ without distorting, I've essentially got a much more customized sound on this IEM compared to all the headphones and other IEMs in my stable.

The values are all over the place as I play with the bands for each song. But the peak filters, Q-factors and frequency bands are what I use constantly to trim or add fat.

 

[Maximiliano Campo]

Beautifully written, and every word is spot on! Because I don't have anywhere near your talent with words I'll just say the Quantum is yin to my life's yang!

And that, what you've just written is beautifully poetic too.