BASE -LINE PIN
soundcheck39.squig.link/303540455055606570758085dB20Hz30405060801001502003004005006008001k1.5k2k3k4k5k6k8k10k15k20kHzBGVP NS10 Red Nozzle (R)
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Sub bass frequencies are responsible for rumble. Elevated sub bass can lend an added sense of depth to music, and usually does not come at the expense of "bleeding into the midrange." Is there a limit to how much sub bass sounds good? Some may argue no, but I find too much sub bass can sound conspicuously disjointed from the rest of the music. It's notable, however, that a lot of music is light on usage of sub bass, so a sound signature that's big on sub-bass but light on mid bass may not sound very bassy with some popular recordings.

Mid bass is responsible for a sense of punch. In contrast to sub bass, mid bass is typically more percussive and energetic, feeling like it's literally pushing air, and can lend a sense of body and fullness to a sound. Listeners craving a "bassy" sound will commonly be more satisfied by mid bass emphasis, as it will add a bassy punch to most common music. However, too much mid bass can give the sound a sense of bloat, or even yield the dreaded midrange "bleed" in which lower midrange notes are masked and smeared by excessive mid bass presence. Ideally, mid bass tapers off by 200Hz.

A full lower midrange, tapering upward into the bass region, can lend a sense of thickness and warmth to the overall tone, while a "scooped" lower midrange can give a very clean sound at the cost of some thinness to the body. A lot of deep vocal micro detail depends on a well-executed lower midrange. But lower midrange is often sacrificed to create contrast between bass and treble for a typical "V-shaped" sound signature, which will commonly exhibit less natural vocal timbre than a more linear midrange tune.

Upper midrange is where a lot of "clarity" in a tune comes from. An elevated -- or "forward" -- upper midrange typically results in a forward vocal presentation, especially emphasizing higher-pitched vocals. Trumpets and guitars get their bite from upper midrange frequencies. Too much upper midrange can result in shrill or "shouty" vocals. Too little can result in a distant, recessed sound that's low on clarity. And uneven upper midrange emphasis can lead to oddly nasal or hollow vocals, with other odd timbral effects.

Also commonly referred to as "lower treble," the presence region has a lot to do with the naturalness of vocal transients. Too much emphasis here and vocals may take on an "edgy" or metallic character. Too little emphasis and the tune can lose definition and sound soft or dark. Much of the initial bite of trumpet and acoustic guitar string transients comes from a well-tuned presence region.

A lot of treble harshness and fatigue comes from the mid treble. Peaks in this region commonly result in unpleasant sharpness, or sibilance in vocals which adds abrasive harshness to S and T sounds. Too little mid treble, however, will result in a dark or dead sound, resulting in odd timbre to cymbal strikes. Making matters difficult for us graph readers, there is a commonly-observed "resonance peak" that appears in measurements, usually situated at 8kHz, that is an artifact of the measurement process. It can often be hard to tell how much of such a peak is "real" without listening.

In the way sub bass can add a sense of depth to the low end, air frequencies -- also called upper treble -- can add a dimensionality via the top end. When air frequencies are "rolled off," the sound may lose a sense of micro detail and definition, and cymbals may lose shimmer, leaving them blunt in their decay. Too much air is not common, but certainly possible, resulting in a fatiguing "shh shh" to cymbals, drum brushes, and other high-frequency sounds.

Targets
Neutral
Diffuse Field
Etymotic
Free Field
Innerfidelity ID
Reviewer
Antdroid
Bad Guy
Banbeucmas
Crinacle
Precogvision
Super Review
Preference
Harman
Rtings
Sonarworks
BGVP
NS10 Red Nozzle
LRonlyonly!
(or middle/ctrl-click when selecting; or pin other IEMs) LOCK
7hz
Accoustone
Aful
Ambient Acoustic
Aoshida
Apevoix
Apple
Artti
Astrotec
Atvel
Audiosense
BGVP
Blon
Bqeyz
CCA
CVJ
Celest
Clavelon
Debauche Bacchus
Dunu
Elysian Acoustic Labs
Empire Ears
EPZ
FatFreq
Floaudio
Fiio
Geek Wold
Gizaudio x Binary
HarmonicDyne
Heartfield Acoustic
Hidizs
Hisenior
HzSound
Hyla
Ibasso
Icelab
Ikko
ISN AUDIO
Intime
Intuaura View
ivipQ
Inawaken
Jerry Harvey/AK
JQ
Juzear
Kbear
Kennerton
Kefine
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Kinera
Kiwi Ears
KZ
Letshuoer
Magaosi
Meeaudio
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MYER-AUDIO
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ND
NFACOUS
NiceHCK
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Penon
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QOA
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Rose Technics
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Seeaudio
Semkarch
Simgot
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Snowy88
Soratune
Sound Rhyme
Shanling
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Tangzu
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TFZ
Thieaudio
Tinhifi
Tipsy x EPZ
TRI
Tripowin
TRN
Twistura
VE
Yanyin
ZHulinniao
Ziigaat
Uploaded
7hz Aero
7hz Aurora
7hz Elua
7hz G1
7hz Five
7hz Zero
7hz Zero II
7hz Salnotes Dioko
7hz Sonus
7hz Timeless
7hz Timeless II
7hz Legato
Accoustone 1670ss
Aful Explorer
Aful MagicOne
Aful Performer 5
Aful Performer 5+2
Aful Performer 8
Ambient Acoustic MAD16
Aoshida E20
Apevoix Grit
Apple ma850
Artti R1
Artti R2
Artti T10
Artti T10 Pro
Astrotec Vesna
Atvel Tine S5 Pro
Atvel Tine S5 ProX
Audiosense AQ4
BGVP DMA
BGVP Feather
BGVP VG4
BGVP NS10
BGVP NS10 Pro
BGVP P05
BGVP Q3
Blon BL-03 II
Blon BL-03
Blon JoJo
Blon Z200
Bqeyz BQ10
Bqeyz Cloud
Bqeyz Frost
Bqeyz Topaz
Bqeyz Winter
Bqeyz Wind
CCA DUO
CCA CXS
CCA PLA13
CVJ Aria
CVJ Assassin
CVJ Bidong
CVJ Konoka
CVJ KUMO
CVJ Mei
CVJ Freedom
CVJ Yukimi
Celest IgniteX Beast
Celest Wyvern Abyss
Celest Wyvern Qing
Celest Wyvern Pro
Celest Gumiho
Celest Pandamon
Celest Pandamon 2.0
Celest PhoenixCall
Celest Plutus Beast
Celest Relentless
Clavelon Delta
Debauche Bacchus Monroe
Dunu Falcon Ultra Blue Nozzle
Dunu Kima
Dunu Kima2
Dunu Kima Classic
Dunu x Gizaudio DaVinci
Dunu SA6 MK2
Dunu Titan S2
Elysian Acoustic Labs Pilgrim
Empire Ears Odin
Empire Ears Raven
EPZ G20
EPZ K5
EPZ Q1
EPZ Q1 Pro
EPZ Q5
EPZ Q5 Pro
EPZ P50
EPZ 320
EPZ 530
EPZ 530 new
EPZ 620
FatFreq Grand Maestro
Floaudio Bluelover
Floaudio Lily
Fiio Fa1 2200 filter
Geek Wold GK20
Geek Wold GK80
Gizaudio x Binary Chopin
Gizaudio x Binary Chopin+25Ω
HarmonicDyne Black Hole
Heartfield Acoustic Orange
Hidizs MP145
Hisenior Mega 5 est
Hisenior Mega5est v2
Hisenior Okavango
Hisenior T4
Hisenior Queztal
HzSound Heart Mirror Pro
HzSound Heart Mirror Zero
HzSound Luna
Hyla Ce5
Ibasso it01s
Ibasso 3T-154
Icelab 3v1
Ikko OH2 Opal
Ikko OH10S
Ikko OH300
ISN AUDIO Neo 3
Intime SHO
Intuaura View Splendor
Intuaura View Splendor II
Intuaura View Luster Ultimate
ivipQ Conch V13
ivipQ Conch V13 ver2
ivipQ Conch V12
ivipQ Sample 1
ivipQ IQ15
Inawaken Dawn Ms
Jerry Harvey/AK Billie Jean
JQ 4U pro
Juzear Flame
Juzear Butterfly 61t
Juzear Dragonfly 81T
Kbear Flash
Kbear Streamer
Kbear KB01
Kennerton Rig
Kefine Klanar
Kefine Delci
Kefine Delci AE
Kefine Klean
Kiiboom Evoke
Kiiboom Allure
Kinera Pandamon
Kinera Hodur
Kinera Freya 2.0
Kinera IDUN 2.0
Kiwi Ears Aether
Kiwi Ears Airoso
Kiwi Ears Cadenza
Kiwi Ears Canta
Kiwi Ears Forteza
Kiwi Ears Dolсe
Kiwi Ears Quartet
Kiwi Ears Melody
Kiwi Ears Orchestra Lite
Kiwi Ears Quintet
Kiwi Ears x Crinacle Singolo
Kiwi Ears x HBB Punch
Kiwi Ears KE4
KZ AS10 Pro
KZ D-fi 0-0-0-0
KZ EDA Balanced
KZ EDC PRO
KZ EDX Ultra
KZ Krila
KZ Libra
KZ PR1 Balanced
KZ PR1 HiFi
KZ PR1 Pro
KZ PR2
KZ PR3
KZ PRX
KZ ZAT
KZ ZVX
Letshuoer Cadenza 4
Letshuoer Galileo
Letshuoer D13
Letshuoer DZ4
Letshuoer S12 Pro
Letshuoer S08
Letshuoer S15
Magaosi K5
Magaosi MSG-401
Magaosi v3
Meeaudio p1
Meeaudio Planamic
Moondrop Kato
Moondrop Chu
Moondrop Chu 2
Moondrop Lan
Moondrop Stellaris
Muse HiFi The EAST6
MYER-AUDIO CKLVX D41
MYER-AUDIO CKLVX D62
MYER-AUDIO CKLVX CK2V
MYER-AUDIO SLIIVO SL41 MK2
MYER-AUDIO SLIIVO SLA3
MYER-AUDIO Sliivo SLT6
NF Audio NE4 Evolution
NF Audio RA10
ND Planet
NFACOUS NM20
NiceHCK NiceHCK F1 Pro
Nostalgia Audio Camelot Universal
Oriolus Mellianus
Oriveti bleaqk Dynabird
Ostry Kc09
Penon FAN 2
Pula Anvil 114
QDC Anole v14
QKZ x HBB Khan
QKZ x HBB
QOA Adonis
QOA Adonis New
QOA Aviation
QOA Mimosa
QOA Vesper 2
Raptgo Hook X
Raptgo Hook x HBB
Rose Technics QuietSea
Rose Technics Aurora Ultra
Rose Technics QT-X
Rose Technics Star City 5 Pro
Shozy Black Hole Mini
Shozy P10
Shozy P20
Shuoer EJ07M
Seeaudio Bravery ae
Seeaudio Yume IV
Semkarch CNT1
Simgot EM6L
Simgot ET142
Simgot EM10
Simgot EW200
Simgot EW100P
Simgot EA500
Simgot EA500 LM
Simgot EA1000
Simgot EW300
Simgot EW300 DSP
Simgot EW300 DSP+other cable Silver
Sivga Que
Snowy88 A5e Old bass
Snowy88 A5e
Snowy88 A3e
Snowy88 A3 Leo
Snowy88 Leo Test
Snowy88 A7-1
Snowy88 A8
Snowy88 A8+
Soratune YI01
Sound Rhyme DTE500
Sound Rhyme SP01
Shanling MG20
Tanchjim ONE
Tanchjim Kara
Tanchjim 4U
Tangzu FuDu
Tangzu Zetian Wu
Tangzu Zetian Wu Heyday
Tangzu Waner S.G Studio Edition
Tangzu Xuan NV
Temperament X10
TFZ King pro
TFZ x Angelears Athena
Thieaudio Elixir
Thieaudio Hype 2
Thieaudio Hype 4
Thieaudio Oracle MKIII
Tinhifi C0 ELF
Tinhifi C2
Tinhifi C2 2025
Tinhifi C2 2025 DSP
Tinhifi C3
Tinhifi C3 MKII
Tinhifi C5
Tinhifi DUDU
Tinhifi T2
Tinhifi T4+
Tinhifi T7
Tinhifi p1+ mod
Tinhifi P1 Max II
Tinhifi P1 Max
Tinhifi T5S Mars
Tipsy x EPZ Star One
TRI i3 MK3
TRI Starsea 0-0
TRI x HBB KAI
Tripowin Cencibel
Tripowin Kailua
Tripowin Lea
Tripowin Olina
Tripowin x HBB Olina SE
Tripowin x 0diBi Vivace
TRN Azure Dragon
TRN Conch
TRN Shell
TRN White Tiger
TRN Mars
TRN Medusa
TRN MT4 Pro
TRN V90 Pro
Twistura Sigma
VE SIE
Yanyin Aladdin
Yanyin Carmen
Yanyin Moonlight
Yanyin Canon
Yanyin Canon II
Yanyin Canon Pro
ZHulinniao QingLuan Z4
Ziigaat Arete
Ziigaat x HBB Arcadia
Ziigaat Cinno
Ziigaat Cincotres
Ziigaat Doscinco
Ziigaat Estrella
Ziigaat Nuo
Ziigaat Odyssey

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It represents the audible frequency response of a particular headphone model, which tells us a lot about how it sounds.