Will these work on an old intel optiplex with the green 1/8" rca female plug?

Besides RCA inputs, Logitech Z333 has a hard wired cable ending in a 1/8" stereo (tip/ring/sleeve) male connector for input. This will work with the green ringed female connector on your computer. Alternatively, you could use a cable having a 1/8" stereo tip to RCA male connectors, but this isn't necessary; the cable included with Z333 works just fine.

Do they include any cables?

Yes, cables are included to connect computer to sub and then from sub to satellite speakers. The volume control is also cabled and works great.

peaks at about 80 watts, but runs at a solid 40 watts

What is the subwoofer size?

The subwoofer size is 9.05 inches x 9.13 inches x 6.20 inches.

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Logitech Z333 2.1 Speakers – Easy-access Volume Control, Headphone Jack – PC, Mobile Device, TV, DVD/Blueray Player, and Game Console Compatible

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80 WATTS OF BOLD SOUND -80 Watts Peak/40 Watts RMS power delivers maximum loudness via two satellite speakers and a large subwoofer. Enjoy rich, clear, bold sound. (Small driver (tweeter) on satellite speakers is decorative and non-operational)
STRONG BASS - The front-facing subwoofer produces rich bass, adding another dimension to your videos, games and music. Experience strong bass you can hear and feel.
VERSATILE SETUP – Connect up to two compatible devices via the 3.5 millimeter and RCA inputs. No need to disconnect when switching between audio sources.
SIMPLE CONTROLS - Easily access power, volume and the headphone jack using the wired control pod. Adjust the bass level with the dedicated control knob on the back of the subwoofer.
Headphone jack - Listen to your music privately via the headphone jack located on the front of the right speaker.
NOTE: Refer user manual before use
Front-facing subwoofer: 5 inch driver adds deep, intense bass to your music, movies and games.

Overview

Specs

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Logitech Z333 Omnidirectional 2.1 Desktop Speaker Combo

Model
Brand	Logitech
Series	Z333
Model	980-001203

Details
Type	Wired
Color	Black
Configuration	2.1
Total Power	40W (RMS)
Satellite RMS Power /ea	8W
Subwoofer RMS Power	24W
Frequency Response	55 Hz - 20 kHz
Signal to Noise Ratio(SNR)	Satellites: 85dB, A-weighted Subwoofer: 80dB, A-weighted
System Requirements	Works with any device with either headphone jack 0.14 in (3.5 mm) or RCA inputs: - Television - Computer - Smartphone - Tablet - Music player - DVD player - Blu-ray player - PlayStation - Xbox - Wii

Dimensions & Weight
Dimension	Satellite: 7.55" x 4.25" x 3.54" Subwoofer: 9.05" x 9.13" x 6.20" Control pod: 2.12" x 2.16" x 2.16" Cable length: Power cable: 59.06 in (150 cm) Right satellite to subwoofer: 59.06 in (150 cm) Left satellite to subwoofer: 59.06 in (150 cm) Control pod hard wired cable: 59.06 in (150 cm)
Weight	Satellite: 1.32 lbs. Subwoofer: 5.50 lbs. Control pod: 0.16 lb.

Features
Features	80 Watts peak power Deep, intense bass Convenient controls Adjustable bass Multiple device inputs

Package Contents
Package Contents	Right satellite Left satellite Subwoofer User documentation

Additional Information
First Listed on Newegg	August 28, 2026

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