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Type 4 Passive Sonar

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No.149 四式水中聴音機
Sonar.png Small Sonar
Effects: Armor+1 ASW+12 Accuracy+1
Scrap value: Steel 1 Bauxite 3 (Unbuildable)

Equipment Card Type 4 Passive Sonar.png

Equipment Character Type 4 Passive Sonar.png

Equipment Item Type 4 Passive Sonar.png

Equipment Full Type 4 Passive Sonar.png

Refittable Class
Coastal Defense Ship Destroyer
Light Cruiser Torpedo Cruiser
Heavy Cruiser Training Cruiser
Aviation Cruiser Fast Battleship
Battleship Aviation Battleship
Light Carrier Standard Aircraft Carrier
Armored Carrier Seaplane Tender
Submarine Aircraft Carrying Submarine
Submarine Tender Fleet Oiler
Repair Ship Amphibious Assault Ship

Introduction

小型艦艇にも装備可能な、新型パッシブソナー兵装です。
九三式水中聴音機に比べて、その対潜発見能力は格段に向上しました。
数は少ないですが、大戦末期に建造された後期型の駆逐艦などの対潜兵装として装備されました。

This SONAR can be equipped on smaller ships, and is a new type of armament: the "passive SONAR."
Compared to the type 93 SONARs, this has increased ASW.
There are few of these because it was made in the later part of the war, and were equipped by some of the newer destroyers.

Notes

ASW Damage Synergy
Small SONARSmall Small Sonars
Equipment Card Type 93 Passive Sonar.png
Type 93 Passive Sonar
Equipment Card Type 4 Passive Sonar.png
Type 4 Passive Sonar
Equipment Card Type 3 Active Sonar.png
Type 3 Active Sonar
Equipment Card Type 3 Active Sonar Kai.png
Type 3 Active Sonar Kai
Equipment Card Type124 ASDIC.png
Type124 ASDIC
Equipment Card Type144 147 ASDIC.png
Type144/147 ASDIC
Equipment Card HF DF + Type144 147 ASDIC.png
HF/DF + Type144/147 ASDIC
Large SONARLarge Large Sonars
Equipment Card Type 0 Passive Sonar.png
Type 0 Passive Sonar
Depth Charge ProjectorDCP Depth Charge Projectors (DCP)
Equipment Card Type 94 Depth Charge Projector.png
Type 94 Depth Charge Projector
Equipment Card Type 3 Depth Charge Projector.png
Type 3 Depth Charge Projector
Equipment Card Type 3 Depth Charge Projector (Concentrated Deployment).png
Type 3 Depth Charge Projector (Concentrated Deployment)
Equipment Card Prototype 15cm 9-tube ASW Rocket Launcher.png
Prototype 15cm 9-tube ASW Rocket Launcher
Equipment Card RUR-4A Weapon Alpha Kai.png
RUR-4A Weapon Alpha Kai
AP
Equipment Card Mk.32 ASW Torpedo (Mk.2 Thrower).png
Mk.32 ASW Torpedo (Mk.2 Thrower)
AP
Depth Charge RacksDCR Depth Charge (Racks) (DCR)
Equipment Card Type 95 Depth Charge.png
Type 95 Depth Charge
AP
Equipment Card Type 2 Depth Charge.png
Type 2 Depth Charge
AP
Equipment Card Lightweight ASW Torpedo (Initial Test Model).png
Lightweight ASW Torpedo (Initial Test Model)
AP
Equipment Card Hedgehog (Initial Model).png
Hedgehog (Initial Model)
AP
ASW MortarOther ASW Mortars
Equipment Card Type 2 12cm Mortar Kai.png
Type 2 12cm Mortar Kai
Equipment Card Type 2 12cm Mortar Kai (Concentrated Deployment).png
Type 2 12cm Mortar Kai (Concentrated Deployment)
ASW Damage Modifiers [math]\displaystyle{ \text{Mod}_\text{synergy} }[/math]
SONAR + Depth Charges 1.15x
Depth Charge ProjectorDCP + Depth Charge RacksDCR 1.1x
Large SONARLarge + Depth Charge ProjectorDCP + Depth Charge RacksDCR 1.265xLarge SONARLarge + Depth Charges = 1.15x
Depth Charge ProjectorDCP + Depth Charge RacksDCR = 1.1x

1.15 * 1.1(1 + 0.1) = 1.265x
Small SONARSmall + Depth Charge ProjectorDCP + Depth Charge RacksDCR 1.4375xSmall SONARSmall + Depth Charge ProjectorDCP / ASW MortarOther = 1.15x
Small SONARSmall + Depth Charge RacksDCR = 1.15x
Depth Charge ProjectorDCP + Depth Charge RacksDCR = 1.1x

1.15 * 1.25(1 + 0.1 + 0.15) = 1.4375
Armor Penetration
Indepentant of synergies, some equipment provides additional armor penetration to ASW attacks.

The flat armor penetration value is calculated as follows:

  • [math]\displaystyle{ \text{Pen} = \sum\limits_{\text{Equipment}} \Big( \sqrt{\text{ASW}_\text{Equipment} - 2} + \text{Mod}_\text{ship} \Big) }[/math]
  • With:
    • [math]\displaystyle{ \text{ASW}_\text{Equipment} }[/math] the base ASW Anti-Submarine Warfare stat of the applicable equipment,
    • [math]\displaystyle{ \text{Mod}_\text{ship} }[/math] being 1 for DE, 0 otherwise,
  • Armor penetration from equipment stacks,
  • The final armor of the targetted submarine cannot go below 1.

How To Obtain

Upgradeable from: Type 93 Passive SonarType 93 Passive Sonar

From quest: B74

From limited-time quest: SB05

Ranking reward for:

  • Aug 2015: 1-5 (x2), 6-20 (x2), 21-100 (x2), 101-500
  • Apr 2016: 1-5, 6-20, 21-100, 101-500
  • Dec 2016: 1-5, 6-20, 21-100, 101-500

Event reward for:

Uses

Used to improve: Type 4 Passive SonarType 4 Passive Sonar

Updates History

  • 2015-09-22: Implemented as ranking reward
  • 2015-09-25: Became improvable
  • 2017-09-29: Stats increased: Armor+0 → Armor+1
  • 2020-01-14: Visible bonuses added
  • 2021-03-01: Visible bonuses added for Katori-classKatori
    Kashima

Fit Bonuses

Ship Extra Requirement Firepower Torpedo Attack Anti-Air Anti-Submarine Warfare Line of Sight Armor Evasion Note
Yuubari Kai Ni DYuubari Kai Ni D +3 +5 Non-stackable
Noshiro Kai NiNoshiro Kai Ni +2 +4 Non-stackable
Isuzu Kai NiIsuzu Kai Ni
Naka Kai NiNaka Kai Ni
Yura Kai NiYura Kai Ni
Yuubari Kai Ni/TokuYuubari Kai Ni
Yuubari Kai Ni Toku

Yukikaze Kai NiYukikaze Kai Ni
+1 +3 Non-stackable
Akizuki-classAkizuki Kai
Teruzuki Kai
Hatsuzuki Kai
Suzutsuki Kai
+1 +2 Non-stackable
Katori-classKatori
Kashima
+2 +3 Non-stackable between itself, Type 93 Passive SonarType 93 Passive Sonar, Type 3 Active SonarType 3 Active Sonar

Akashi's Improvement Arsenal

Type Name Resource Day 2nd Ship Note
Fuel Ammunition Steel Bauxite Item Icon Development Material.png Item Icon Improvement Material.png # of equipment needed for that upgrade. An asterisk following the number indicates a different equipment is required. Sun Mon Tue Wed Thu Fri Sat
SONAR Type 4 Passive Sonar 0 10 0 50 60 5/7 3/5 2xSonar.png  
 
 
A
 
 
Y
K
 
 
 
 
K
 
 
 
 
 
 
T
I
Y
 
 
 
I
 
 
 
 
I
 
 
 
 
Isuzu Kai Ni
Yuubari Kai Ni
Katori Kai
Akizuki
Teruzuki
6 6/10 4/6 1xSonar.png
10 - - -

See Also