Pioneer S-X4
The Pioneer S-X4 is a floor-standing loudspeaker, and the surviving record on it is thinner than you'd hope. The sources that do mention it agree on this much: it's a 3-way, 4-speaker bass-reflex system with an 8-ohm impedance and a 10-inch woofer. The "4-speaker" count comes from two horn tweeters sitting alongside the midrange driver. Pioneer used that configuration on several of its larger S-X series speakers of the era to spread the highs widely through the room.
The crossover is where the documentation gets messy. One source says 300 Hz and 4 kHz, another says 900 Hz and 4 kHz, and a third lists 1 kHz and 5 kHz. That's a wide spread, and without a factory service manual to settle it, there's no good way to pick one. Power handling is just as fuzzy. The spec sheets say 40 watts maximum input, while a forum source mentions "35W - 40W continuous," which doesn't make clear what it's measuring. What seems safe to say is that this was not a high-power-handling speaker. It was built for modest to mid-power amplifiers, consistent with its era and class.
No source gives a frequency response, sensitivity rating, dimensions or weight for the S-X4. There's no original price either, and no production years. A period advertisement for the related Pioneer SX-440 receiver listed it at $189.95 in Audio (July 1969, p.9). The archive doesn't have measurements for these speakers yet.
Known specifications
- Type: 3-way, 4-speaker bass-reflex system
- Woofer: 10 inch
- Impedance: 8 ohms
- Maximum input power: 40 watts
- Drivers include two horn tweeters and a midrange
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