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

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

Product ID: 67057757

Details

Audio Output Mode
Surround
Brand
Dayton Audio
Connectivity Technology
Bluetooth
Mounting Type
Pole
Speaker Maximum Output Power
100 watts

⚡Powerful motor for max efficiency

🌀4-layer 1" voice coil for deep bass

❄️Aluminum former for cool operation

R1103

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Description

🎵 Elevate your sound game with precision-engineered midbass power!

SEAMLESS STYLE - Low-profile mounting flange blends effortlessly into any setup without bulky flush mounts.
COMPACT POWERHOUSE - High-efficiency motor delivers punchy midbass in a sleek 4" form factor.
COOL UNDER PRESSURE - Aluminum former keeps the voice coil temperature down for reliable high-power handling.
VERSATILE COMPATIBILITY - Perfectly tuned for car audio systems, smartphones, tablets, and TVs with Bluetooth connectivity.
DEEP DISTORTION FREE BASS - 4-layer voice coil and extended pole piece ensure rich lows with minimal distortion.

The Dayton Audio TCP115-8 is a 4" treated paper cone midbass woofer featuring an 8-ohm impedance, a powerful motor for efficient sound delivery, and a 1" 4-layer voice coil for enhanced power handling and low-frequency response. Its aluminum former ensures cool operation under high power, while the extended pole piece reduces distortion. Designed with a sleek low-profile mounting flange, it fits seamlessly into compact enclosures and is ideal for car audio and Bluetooth-enabled devices.

Specifications

ASIN	B07C7MY2D5
Additional Features	Bluetooth, Portable
Antenna Location	For Audio Systems
Audio Driver Size	10 centimeters
Audio Driver Type	Dynamic Driver
Audio Output Mode	Surround
Best Sellers Rank	#39,479 in Electronics ( See Top 100 in Electronics ) #126 in Car Component Subwoofers
Brand	Dayton Audio
Built-In Media	1 x Model TP-8
Color	Black
Compatible Devices	Car Audio System, Smartphone, Tablet, Television
Connectivity Protocol	Bluetooth
Connectivity Technology	Bluetooth
Control Method	Voice
Controller Type	Voice Control
Customer Package Type	FFP
Customer Reviews	4.5 out of 5 stars 198 Reviews
EU Spare Part Availability Duration	7 years
Enclosure Material	Aluminum
Is Waterproof	FALSE
Item Dimensions D x W x H	2.32"D x 4.57"W x 4.57"H
Manufacturer	Dayton Audio
Material	Aluminum
Maximum Range	20 meters
Model Name	TCP115-8
Model Number	TCP115-8
Mounting Type	Pole
Number Of Circuits	2
Number of Audio Channels	2
Number of Items	1
Power Source	Corded Electric
Speaker Maximum Output Power	100 watts
Speaker Size	4 inches
Speaker Type	Woofer
Specific Uses For Product	Vehicle-subwoofer use
Subwoofer Diameter	4 inches
UPC	848791004971
Unit Count	1 Count
Warranty Type	Full
Water Resistance Level	Waterproof
Wireless Technology	Bluetooth
Woofer Diameter	4 inches

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R1103

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered 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 South Africa.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

Meera L.

Smooth transaction and product arrived in perfect condition.

3 weeks ago

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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