Type 93 Passive Sonar

[Edit] Type 93 Passive Sonar No.46 九三式水中聴音機
Small Sonar Effects: +6 +1 Scrap value: 1 1 (Buildable)
Refittable Ship Types
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

対潜兵装です。
いわゆるパッシブソナーです。性能は残念ながら、あまり良くはありません。
でも、あるとないとでは大違い！対潜作戦のお供に、ぜひどうぞ！

An anti-submarine weapon, also known as the passive SONAR. It may not perform its job well, but it's better than nothing. Please use it for anti-submarine operations!

Notes

ASW Damage Synergy
Small Small Sonars	Type 93 Passive Sonar Type 4 Passive Sonar Type 3 Active Sonar Type 3 Active Sonar Kai Type124 ASDIC Type144/147 ASDIC HF/DF + Type144/147 ASDIC
Large Large Sonars	Type 0 Passive Sonar
DCP Depth Charge Projectors (DCP)	Type 94 Depth Charge Projector Type 3 Depth Charge Projector Type 3 Depth Charge Projector (Concentrated Deployment) Prototype 15cm 9-tube ASW Rocket Launcher RUR-4A Weapon Alpha Kai AP Mk.32 ASW Torpedo (Mk.2 Thrower) AP
DCR Depth Charge (Racks) (DCR)	Type 95 Depth Charge AP Type 2 Depth Charge AP Lightweight ASW Torpedo (Initial Test Model) AP Hedgehog (Initial Model) AP Type 2 Depth Charge Kai Ni AP
Other ASW Mortars	Type 2 12cm Mortar Kai Type 2 12cm Mortar Kai (Concentrated Deployment)
ASW Damage Modifiers: [math]\displaystyle{ \text{Mod}_\text{synergy} = {Mod}_\text{1} \times {Mod}_\text{2} }[/math]
[math]\displaystyle{ {Mod}_\text{1} }[/math]	+ (Any Sonar + Any Depth Charge)	1.15
[math]\displaystyle{ {Mod}_\text{2} }[/math]	DCP + DCR and NO Small	1.1
	Small + DCP + DCR	1.25
Examples
[math]\displaystyle{ \text{Mod}_\text{synergy} }[/math]	Small + DCP + DCR	1.4375[math]\displaystyle{ 1.15 \times 1.25 }[/math]
	Large + DCP + DCR	1.265[math]\displaystyle{ 1.15 \times 1.1 }[/math]
Armor Penetration
Indepentant of synergies, some equipment provides additional armor penetration to ASW attacks. The affected equipment are: DCR: Type 95 DC, Type 2 DC, Lightweight ASW Torpedo, Hedgehog, Type 2 DC K2 DCP: RUR-4A Weapon Alpha Kai, Mk.32 ASW Torpedo (Mk.2 Thrower). 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 stat of the applicable equipment, Visible Bonuses and Improvements are not counted here. [math]\displaystyle{ \text{Mod}_\text{ship} }[/math] being 1 for DE, 0 otherwise, Note Armor penetration from equipment stacks, The final armor of the targetted submarine cannot go below 1.

How To Obtain

Buildable

Stock equipment of Asashimo, Fukae Kai, Hatakaze Kai, Hayanami Kai, Hiburi Kai, Hirato Kai, Katori Kai, Kishinami Kai, Matsukaze Kai, Nowaki Kai, Shikinami Kai Ni, Shimakaze Kai, Tanikaze Kai, Tsushima Kai, Umikaze Kai Ni (★+5), Urakaze D Kai, Urakaze Kai, Yamakaze Kai, Yukikaze Kai

From quests: B42, B45, D42 (x3, choice), D43 (x2, choice)

From limited-time quests: SB03

Event reward for:

• Fall 2021 Event E-2: Casual (★+4)

Uses

Used to improve Type 93 Passive Sonar, Type 4 Passive Sonar

Used by quests: F50, F98, F99, F103

Updates History

• 2013-05-08: Implemented
• 2013-11-01: Stats increased: +4 +0 → +6 +1
• 2014-02-26: Depth charge synergy added
• 2015-01-09: Became improvable and upgradeable to Type 3 Active Sonar
• 2015-06-26: Bonus torpedo evasion from improvement added
• 2015-09-25: Became upgradeable to Type 4 Passive Sonar
• 2017-02-28: Build rate increased
• 2021-03-01: Visible bonuses added for Katori-class
  

Fit Bonuses

Ship	Extra Requirement									Note
Katori-class					+2				+3	One-time between Type 93 Passive Sonar, Type 3 Active Sonar, Type 4 Passive Sonar and Type 3 Active Sonar Kai

Akashi's Improvement Arsenal

Type	Name	★	Resource							Day							2nd Ship	Note
										Sun	Mon	Tue	Wed	Thu	Fri	Sat
	Type 93 Passive Sonar	0	10	0	30	30	2/2	1/2	-	S K	X	X	X	S   I	S K I	S K	Shigure Kai Ni Katori Kai Isuzu Kai Ni	Upgrades to Type 4 Passive Sonar.
		6					3/4	2/3	1x
		10					10/20	6/12	2x
		0					{{{Fuel:2}}}	{{{Ammo:2}}}	{{{Steel:2}}}	{{{Baux:2}}}	2/2	1/2	-	Y	I	X	X	X	Y	Y	Yuubari Isuzu Kai Ni	Upgrades to Type 3 Active Sonar ★+3.
		6									3/4	2/3	1x
		10									6/9	3/5	2x