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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Description

🎵 Elevate your sound game with precision bass that commands attention!

COMPACT POWERHOUSE - Delivers deep bass and rich mids in a sleek 4" form factor, perfect for refined audio setups.
VERSATILE COMPATIBILITY - Seamlessly integrates with desktops, home theaters, laptops, and more — your all-in-one sound upgrade.
SLEEK LOW PROFILE DESIGN - Cosmetic mounting flange offers a clean, modern look without the need for flush mounting — style meets function.
HEAT RESISTANT PERFORMANCE - Aluminum former keeps the voice coil cool, ensuring consistent power handling during intense listening sessions.
PRECISION SOUND ENGINEERING - Extended pole piece creates a symmetrical magnetic field, minimizing distortion for crystal-clear audio.

The Dayton Audio TCP115-8 is a 4" treated paper cone midbass woofer featuring a powerful motor and a 1" diameter 4-layer voice coil for enhanced power handling and low-frequency response. Its aluminum former ensures efficient heat dissipation, while the extended pole piece reduces distortion for clear, balanced sound. Designed for compact enclosures and versatile audio systems, it delivers impressive bass and midrange performance with a sleek, low-profile mounting flange.

Specifications

Material	Aluminum
Model Name	TCP115-8
Speaker Type	Woofer
Special Feature	Portable
Recommended Uses For Product	For Audio Systems
Compatible Devices	Desktop, Home Theater, Laptop, Smartphone, Tablet, Television
Subwoofer Diameter	4 Inches
Surround Sound Channel Configuration	2.0
Included Components	1 x Model TP-8
Product Dimensions	5.9D x 11.6W x 11.6H Centimeters
Is Waterproof	FALSE
Maximum Range	20 metres
Control Method	Voice
Wireless Communication Technology	Bluetooth
Speaker Size	4 Inches
Power Source	Corded Electric
Brand Name	Dayton Audio
RMS Power Range - Amplifiers	40 Watts
Item model number	TCP115-8
Manufacturer	Dayton Audio
Country of Origin	USA
Item Weight	880 g

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