If you purchase a pair, some maintenance is recommended.
There are usually level controls (L-pads) for the midrange and tweeter on the back. These get scratchy. A spray of Deoxit contact cleaner will fix them.
Like many vintage Pioneer CS models, the 787 is often described as having a pleasing, non-fatiguing sound that can be listened to all day. Midrange Presence:
After 45+ years, the electrolytic capacitors in the crossover have drifted out of spec. This makes the sound dull or unbalanced. Replacing these with polypropylene film capacitors is the single best upgrade you can make. It will cost $50 in parts and an hour of soldering. pioneer cs-787
The centerpiece of the lower cabinet is a . Tuned to a front-firing or rear-vented bass reflex enclosure, it drops down to a respectable 40 Hz. This gives the CS-787 a characteristically warm mid-bass slam. It excels with analog vinyl playback, capturing the natural resonance of acoustic bass and drums without the muddy, artificial boom of modern miniature subwoofers. Mids and Highs: Dedicated Separation
A dedicated cone driver handling the critical vocal frequencies (300 Hz to 3,000 Hz).
4 to 5-inch cone midrange driver housed in an isolated internal sub-enclosure to prevent interference from the woofer's back-wave. If you purchase a pair, some maintenance is recommended
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: To get the absolute best stereo imaging and soundstage from the CS-787, place them on solid speaker stands at ear level, slightly toed-in toward your primary listening position. Final Thoughts
3-Way (or 4-Way depending on the specific regional sub-variant), Bass-Reflex floor-standing system. A spray of Deoxit contact cleaner will fix them
The engineering inside the CS-787 reflects the "East Coast" sound influence—warm, rich, and room-filling—despite Pioneer being a Japanese firm.
The Apex of the Stone Age: A Technical and Historical Analysis of the Pioneer CS-787 Speaker System
The CS-787 is designed to be efficient, making it compatible with a wide range of vintage amplifiers. System Type: 3-Way, Bass Reflex. Driver Configuration: ) cone for low-frequency response. Power Handling: (nominal) and up to (music power). Impedance: (some variants may show Frequency Range: Dimensions: Approximately Sound Profile & Performance Warm & Non-Fatiguing: