do they have to be in an enclosure or can they play free-to-air?

I have not heard of many cases where speakers like these play free-to-air. Most speakers are designed to use an enclosure to get the best sound quality. I have seen videos of unique "open space" panel speakers but they are rather unique. If you go to https://www.diyaudioandvideo.com/ you can use their utilities to determine the best way to create the enclosure based on the measured parameters of the speaker (e.g. sealed vs. ported).

What are the mounting hole dimensions, i.e. Distance between holes on one side? I need to match a speaker with 3 13/16" inches between holes.

The measurement between holes is 3 1/8". The measurement from one hole across to the opposite hole is 4 1/4".

What's the lowest frequencies they can produce?

According to the specification sheet (which you can download from the manufacturer's website) this speaker can go down to 55 Hz. This can be manipulated somewhat by using a ported tube and adjusting the length.

Could this work as a sub replacement for a Logitech z509?

Yes. This sub makes a good replacement for most PC 4" PC audio subs. Please make sure that your old speaker was 8 Ohm

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Dayton Audio TCP115-8 4" Treated Paper Cone Midbass Woofer 8 Ohm

Product ID: 265810686

Details

Audio output mode
Mono
Brand
Dayton Audio
Connectivity technology
Bluetooth
Mounting type
Pole
Speaker maximum output power
100 Watts

🎯4-layer voice coil for power & clarity

🔥Powerful motor boosts bass output

❄️Aluminum former keeps coil cool

¥9804

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Description

🎵 Compact Powerhouse: Big Bass, Small Footprint, Zero Compromise!

COOL UNDER PRESSURE - Aluminum former ensures optimal heat dissipation, maintaining peak performance during extended sessions.
LOW DISTORTION SOUND - Extended pole piece creates a symmetrical magnetic field, reducing distortion for crystal-clear midbass.
PRECISION POWER HANDLING - 1" 4-layer voice coil maximizes power and low-frequency depth for rich, immersive sound.
SLEEK MINIMALIST DESIGN - Low-profile mounting flange offers a clean look without the need for flush mounting—style meets function.
EFFICIENT BASS PERFORMANCE - High-excursion motor delivers surprising bass punch from a compact 4" woofer—perfect for sleek setups.

The Dayton Audio TCP115-8 is a 4" treated paper cone midbass woofer featuring an 8-ohm impedance and a powerful motor system. Its 1" diameter 4-layer voice coil and aluminum former enable high power handling and efficient heat dissipation, delivering deep bass and clear midrange in compact enclosures. Designed for professional-grade 2-way speaker systems, it offers low distortion and a sleek mounting flange for seamless integration into modern audio setups.

Specifications

ASIN	B07C7MY2D5
Additional Features	Portable
Age Range Description	Adult
Antenna Location	For Smartphones or Tablets, For Portable Use
Audio Driver Size	10.16 Centimeters
Audio Driver Type	Dynamic Driver
Audio Output Mode	Mono
Audio output mode	Mono
Best Sellers Rank	#132,828 in Electronics ( See Top 100 in Electronics ) #116 in Home Audio Subwoofers
Brand	Dayton Audio
Built-In Media	1 x Model TP-8
Color	Black
Compatible Devices	Desktop, Laptop, Smartphone, Tablet, Television
Compatible with Vehicle Type	Car
Connectivity Protocol	Bluetooth
Connectivity Technology	Bluetooth
Connectivity technology	Bluetooth
Control Method	Voice
Controller Type	Voice Control
Customer Package Type	Flat Free Package (FFP)
Customer Reviews	4.5 out of 5 stars 193 Reviews
EU Spare Part Availability Duration	7 Years
Enclosure Material	Aluminum
Impedance	8 Ohms
Is Waterproof	False
Item Dimensions D x W x H	5.9D x 11.6W x 11.6H centimeters
MP3 player	No
Manufacturer	Dayton Audio
Material	Aluminum
Maximum Range	20 Meters
Model Name	TCP115-8
Model Number	TCP115-8
Mounting Type	Pole
Mounting type	Pole
Number of Audio Channels	2.0
Number of Items	1
Power Source	Corded Electric
Speaker Maximum Output Power	100 Watts
Speaker Size	4 Inches
Speaker Type	Woofer
Speaker maximum output power	100 Watts
Specific Uses For Product	[INF] Inferred: Near-field monitoring, studio recording setups, compact home theaters, portable audio systems, or personal audio setups
Subwoofer Connectivity Technology	Wired
Subwoofer Diameter	4 Inches
Tweeter Diameter	1 Inches
UPC	848791004971
Unit Count	1.0 Count
Water Resistance Level	Waterproof
Wireless Technology	Bluetooth
Woofer Diameter	4 Inches

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¥9804

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Japan.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

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