MLI 691PA 1990s Vintage Desktop PC Speakers 3.5mm w/ AC Adapter – Hum Issue

Description

MLI 691PA Hi‑Fi Sound Monitor Speakers – Vintage 1990s Computer Audio

This listing is for a pair of vintage MLI 691PA powered desktop speakers, typical of 1990s PC audio setups. The speakers feature a classic beige design, integrated wiring, and a standard 3.5mm audio connection. An AC adapter is included.

Features

• Model: MLI 691PA
• “Hi‑Fi Sound Monitor” branding
• 3.5mm audio input (attached cable)
• AC 9V powered (adapter included)
• Front controls for volume and tone
• Power indicator LED
• Fixed speaker-to-speaker wiring

Function Condition

• Speakers power on and produce sound
• A constant low hum is present and does not change with volume
• Audio quality is thin/tinny compared to modern speakers
• May require service or repair for optimal performance

These are best suited for parts, repair, or vintage/retro computer setups.

Demo Videos

Hum test (no audio playing):

Audio playback test:

Note: The hum may not be clearly audible in video due to recording limitations.

Cosmetic Condition

• Visible yellowing from age
• Surface scratches and general wear
• Dust present in grille grooves
• No major cracks or structural damage observed

Included

• Left and right speakers (attached wiring)
• AC power adapter (9VAC)
• Integrated 3.5mm audio cable

Notes

• Vintage electronics sold as-is
• Please review all photos for exact condition