Pioneer Cs787 Extra Quality -

Product Report: Pioneer CS-787 Loudspeaker System

Foam Rot: The 15" woofer surrounds were originally treated cloth or foam. By 2026, check for rot. Re-foaming is a standard job.
L-Pads: The tweeter and super tweeter controls on the front often get scratchy. DeoxIT is your best friend.
Seal the Cabinets: If the woofer gaskets have dried out, the bass will leak. Fresh gasket tape works wonders.
Amplifier Matching: Do not run these with a low-powered 15-watt tube amp. They need current. Look for 40-100 watts of solid-state power (Vintage Pioneer, Sansui, or modern Schiit Vidar).

Poor Pairings:

Low-damping-factor amps (under 50) – the bass becomes flabby.
Ultra-bright class D amps (like some Tripath designs) – the horn tweeter can become harsh.

Cons: Cabinets are typically made of chipboard or LDF (Low-Density Fiberboard) rather than solid wood, which can affect resonance. Binding posts on the rear are often simple "clip-type" connectors. pioneer cs787 extra quality

Market Value: Depending on condition and location, a pair in excellent condition typically lists between €315 and €375 on vintage marketplaces. Pioneer 7 speaker system for sale - Facebook Product Report: Pioneer CS-787 Loudspeaker System

High Frequencies (4kHz – 20kHz)

Here is the "Extra Quality" differentiator. The soft dome tweeter handles the upper mids and the horn super tweeter takes over at 10kHz. The result is airiness. Cymbals decay naturally, and vinyl surface noise is reduced rather than exaggerated. Some users worry that horn tweeters sound harsh, but the CS787’s horn is remarkably polite. Foam Rot: The 15" woofer surrounds were originally

Rating: 7.5/10 (Within the context of vintage budget audio)

Part 3: Sound Signature – The "Vintage Warmth" vs. Modern Clarity

How does the Pioneer CS787 Extra Quality actually sound? If you are used to analytical studio monitors (like Genelec or Yamaha NS-10s), these speakers will feel like a warm embrace.

Audio Characteristics: The sound is often described as having a powerful bass due to its 200mm woofer, with clear and present midranges and high frequencies.