Realistic Optimus-400 Speaker Parts 40-2048 Crossover Tweeter ET-1 8 Ohm 100W

Realistic Optimus-400 Speaker Parts 40-2048 Crossover Tweeter ET-1 8 Ohm 100W

This listing is for a set of internal speaker parts removed from Realistic Optimus-400 three-way floor-standing speakers: two sound adjustment/crossover modules (Cat. No. 40-2048) and two ET-1 ribbon tweeters. The modules combine the crossover network and a front-panel level control panel into a single assembly, giving the listener independent Midrange and High Frequency level adjustment (Low/Flat/High). The ET-1 tweeters are ribbon-element units rated at 7 ohms and 40W max.

Specifications & What's Included

• 2x Realistic Optimus-400 Sound Adjustment / Crossover Modules — Cat. No. 40-2048
• 2x ET-1 Ribbon Tweeters — 7 Ohms, 40W Max
• System impedance: 8 Ohms
• System power rating: 100W Max
• Crossover module features: independent Midrange and High Frequency rotary level controls (Low / Flat / High range)
• Crossover board includes toroidal inductor and passive crossover components
• Tweeter: rectangular ribbon element with black panel mount and four mounting holes
• Manufactured in Japan for Radio Shack / Tandy Corporation
• No speaker cabinets, woofers, or midrange drivers included

Applications

The Realistic Optimus-400 was a high-end three-way floor-standing speaker system sold by Radio Shack (Tandy Corporation) in the 1980s. Manufactured in Japan, it was positioned at the top of the Optimus line and used a ribbon tweeter — uncommon at this price point in that era — paired with an integrated crossover and level-control panel. These parts are useful for restoring or repairing existing Optimus-400 cabinets, or for hobbyist speaker-building projects requiring a compatible crossover module or a 7-ohm ribbon tweeter. The ET-1 ribbon tweeter in particular is a sought-after component among vintage audio enthusiasts and speaker DIY builders.