Up for sale is a vintage late-1970s TAPCO 4400 Dual-Channel Spring Reverberation System, manufactured by Technical Audio Products Corporation in Edmonds, Washington.

A legendary analog rack unit prized for studio tracking, dub production, and warm outboard character, the 4400 gives you two independent channels each loaded with an internal spring tank, drive-level metering, and a dedicated 4-band reverberation equalizer.

Features & Controls:

• Dual-channel analog spring architecture with true stereo or independent dual-mono routing

• Dual VU drive-level meter display

• Dedicated 4-band Reverberation Equalizer sliders per channel (80–240Hz, 240–960Hz, 960–3800Hz, 3800–12kHz)

• Input mute switches and percentage mix controls for seamless wet/dry blending

• Standard 1/4" line-level inputs and outputs on the rear panel with full schematic block diagram

• Attached heavy-duty US 117V power cord

Condition:

• Clean cosmetic vintage condition with original sliders, faceplate graphics, and chassis intact.

• Faceplate and silkscreening remain sharp and legible.

• Sold vintage as-described.

Shipping & Handling:

• Heavy-duty packaging with internal spring protection and reinforced box padding.

• Insured shipping across the Continental U.S. with full tracking.

• Free local pickup available in Honolulu / Oahu, Hawaii.