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Pioneer CS-99

Loudspeaker System (1970-71)

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Pioneer CS-99


The model CS-99 is a 5-way loudspeaker system housed in an oil-finished walnut cabinet.

The system is equipped with level controls and a jack for connection to a tape recorder.


Type: 5 way, 6 driver loudspeaker system

Frequency Response: 25Hz to 22kHz

Power Handling: 80W

Crossover Frequency: 600, 4000, 7500, 14000Hz

Impedance: 8Ω

Sensitivity: 98dB

Bass: 1 x 15"

Midrange: 1 x 5"

Tweeter: 1 x cone

Super Tweeter: 1 x horn, 2 x dome

Enclosure: sealed

Dimensions: 635 x 404 x 290mm

Weight: 24kg

Year: 1971


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TBL's picture

re: CS-99

I had a pair of CS-88A many years ago. Then recently I bought CS-99.

Well the CS-99 doesnt hv good bass at all, running out from I believe 120Hz, despite the huge woofers.

But when I run them with an active two-way crossover teaming to JBL4320 for their 15" woofers, the real deal emerges the way everybody has been wishing for from CS99. The CS99 shows its transparency and quuck response. I also rebuilt the CS99's internal passive crossover. Those bi-polar non-branded caps had already had wild drift8ng capacitance values all over the place! With some modern MKP and MPT cap, the crossover came alive when it started to work.

In a word, coupled with good woofers or subwoofers (I set the active xover point at 200Hz), the CS-99 immediately turns into a different beast, more so effectively and with pleasing results than my Tannoy LZ III Gold 10", Celestion SL700, Rogers LS35a 65th Anni., Sansui SP100 and SP200 etc.

Alone, the CS-99 sounds crisp but tinny due to its no-bass nature.

re: CS-99

These speakers have one problem that the CS-99a's don't have, and that's foam rot, but thankfully it's just the tweeters that have this problem, and the repair cost is very minimal. The front grills are not meant to be detectable, so take care when removing them, but if you do own these speakers there is a 100% chance the tweeters need to be re-foamed, and it is well worth the time and effort it takes to get them fixed.

This website is not affiliated with or sponsored by Pioneer. To purchase CS-99 spares or accessories, please contact the company via their website or visit an authorised retailer.