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PSI Audio · A-Series · Bookshelf
A21-M
$3,719 eachCheck availability ↗
Product description
PSI's two-way mid-field: a 240 mm cone down to 38 Hz, 325 W of Class A/B, and a 2.4 kHz crossover to the hand-built dome. Flat to ±2.0 dB and still entirely analogue — the accuracy comes from hand calibration in the anechoic chamber, not from correction filters. Revised in 2017 as the V4, with a stronger woofer and reworked filters and AOI. One XLR in. Sold individually, in Studio Red, black or white. Made in Switzerland.
Units
| Type | Bookshelf |
|---|---|
| HiFi ladder position | #268 of 409 bookshelf |
| Power | Active |
| Height | 400 mm |
| Width | 250 mm |
| Depth | 300 mm |
| Weight | 12.8 kg |
| Enclosure | bass-reflex-front |
| Drivers | 1× 27 mm tweeter (hand-built dome), 1× 240 mm woofer (paper cone) |
| Crossover frequency | 2400 Hz |
| Frequency response | 38–23000 Hz |
| MAP (USD) | $3,719 each |
| Amplification (per driver) | tweeter 45 W (class AB) · woofer 280 W (class AB) |
| Total amp power | 325 W |
| Max SPL @ 1 m | 110 dB |
| Hi-res audio | — |
| Wired inputs | XLR balanced |
| Streaming / wireless | — |
| Outputs | — |
| Room correction | — |
| Primary + secondary pair | No |
| Wireless inter-speaker link | No |
| Latency | — |
| Idle power | — |
| Max consumption | — |
| Where to buy | Check availability ↗ |
| Manufacturer | psiaudio.swiss ↗ |
| Product page | Open product page ↗ |
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