Short answer: both are discontinued, so this only matters if you are buying used. Used, the KEF Reference 203 is the better pick: it ranks #17 of 188 floorstanding speakers by sound quality (rated 4.6/5), against #177 (rated 2.8/5) for the Sony SS-CS3. If you want one new, the KEF Reference 3 Meta replaces the KEF Reference 203 and is rated 4.6/5 at $15,999.98.
The KEF Reference 203 is the more accurate, deeper-bass pick. Its measured preference score, a predictor of how neutral it sounds, is 5.83 against 4.11 for the Sony SS-CS3. Its bass reaches about 51Hz before falling 3dB, against 72Hz for the Sony SS-CS3. The tradeoff: This is a 20+ year old, long-discontinued speaker only findable secondhand (Facebook Marketplace, Craigslist, audio forums): condition, driver matching, and component aging vary by unit, so audition before buying if at all possible.
Why pick the Sony SS-CS3: Affordable entry-level floorstanding tower offering solid sensitivity (88.6dB SPL at 2.83V/1m), making it easy to power with standard budget AVRs. The tradeoff: Severe cabinet and driver resonances plague the passband between 100Hz and 600Hz, imparting audible coloration and chesty resonances to male vocals and acoustic instruments.
Buy the KEF Reference 203 only if you find one used in good condition; both are discontinued, and it is the better rated of the two. For a new speaker, buy the KEF Reference 3 Meta, which replaces the KEF Reference 203.
Want more options? Browse the full Passive Home rankings.
Specifications Side By Side
| KEF Reference 203 | Sony SS-CS3 | |
|---|---|---|
| Price | $5,000 per pair Discontinued | $450 per pair Discontinued |
| Ranked | #17 of 188 in Large Size Floorstanding Speakers | #177 of 188 in Large Size Floorstanding Speakers |
| Bass Extension (-10dB) | 37Hz (measured, Erin’s Audio Corner) | 39Hz (measured, Erin’s Audio Corner) |
| Bass Extension (-3dB) | 51Hz (measured, Erin’s Audio Corner) | 72Hz (measured, Erin’s Audio Corner) |
| Dimensions | 42”H (1067H mm) | 36.3”H x 9.1”W x 10.2”D (922 x 230 x 260 mm) |
| Impedance | 8 ohms nominal (3.6 ohms minimum, measured, Erin’s Audio Corner; 3.2 ohms per manufacturer spec) | 6 ohms nominal |
| Sensitivity | 88dB (2.83V/1m, measured by Erin’s Audio Corner) | 88.6dB (measured average, Erin’s Audio Corner) |
| Drivers | 1x 0.75” supertweeter, coaxial 1” dome tweeter + 6.5” midrange, 2x 6.5” woofers | 0.75 in. supertweeter, 0.98 in. polyester main tweeter, dual 5.12 in. MRC woofers |
| Weight | 58 lbs (26.3 kg) | 25.4 lbs (11.5 kg) each |
| Woofer Cabinet | Bass reflex, with switchable flat/cut/lifted bass ports for wall placement | ported, front |
| Crossover Frequency | 400Hz, 2.7kHz, 15kHz | - |
| Frequency Response | 55Hz - 55kHz ±3dB (Manufacturer specified) | - |
| Recommended Power | 50-200W | - |
| Spinorama Preference Score | 5.83 | 4.11 |
| Spinorama Preference Score with Perfect Sub | 7.84 | 6.65 |
| DIY Kit | No | No |
Related Speaker Comparisons
How KEF Reference 203 compares with other leading options:
- KEF Blade Two Meta vs KEF Reference 203
- MoFi SourcePoint 888 vs KEF Reference 203
- Revel F328Be vs KEF Reference 203
- KEF R5 Meta vs KEF Reference 203
- Revel F226Be vs KEF Reference 203
Prices on this page were last checked October 9, 2026 at 8:01 AM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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The Two Speakers In Full
KEF Reference 203: $5,000 per pair Discontinued eBay
Newer model: the KEF Reference 3 Meta, ranked lower, rated 4.6/5.
Pros: An unusually accomplished 4-way design for its era: excellent on-axis linearity (within about +/-3dB), genuinely good directivity both horizontally (~55 degrees) and vertically (~40-50 degrees), and an estimated in-room response that closely matches what the reviewer actually heard. Distortion is excellent: under 1% harmonic above 80Hz at both 86dB and 96dB, and multitone stays around 1% even at 96dB. Bass reaches a real F3 of 51Hz (F10 37Hz), with in-room extension into the low-mid-40s. The reviewer’s overall listening notes were essentially “nothing stood out bad or good”: a genuinely neutral, accurate speaker with a distinctive rounded-baffle look that avoids the diffraction issues a flat baffle this wide would normally have. Measured bass extension of 51Hz (-3dB), with a measured sensitivity of 88dB.
Cons: This is a 20+ year old, long-discontinued speaker only findable secondhand (Facebook Marketplace, Craigslist, audio forums): condition, driver matching, and component aging vary by unit, so audition before buying if at all possible. Demands a robust amplifier: impedance dips to about 3.6 ohms with an EPDR of 2.2 ohms. The small supertweeter shows minor breakup artifacts at the extremes of the vertical polar plot and some compression at very high output in the top octave, though neither was audible in normal listening.
Full KEF Reference 203 review and specifications →
| Bass Extension (-10dB) | 37Hz (measured, Erin’s Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 51Hz (measured, Erin’s Audio Corner) |
| Crossover Frequency | 400Hz, 2.7kHz, 15kHz |
| DIY Kit | No |
| Dimensions | 42”H (1067H mm) |
| Drivers | 1x 0.75” supertweeter, coaxial 1” dome tweeter + 6.5” midrange, 2x 6.5” woofers |
| Frequency Response | 55Hz - 55kHz ±3dB (Manufacturer specified) |
| Impedance | 8 ohms nominal (3.6 ohms minimum, measured, Erin’s Audio Corner; 3.2 ohms per manufacturer spec) |
| Recommended Power | 50-200W |
| Sensitivity | 88dB (2.83V/1m, measured by Erin’s Audio Corner) |
| Spinorama Preference Score | 5.83 |
| Spinorama Preference Score with Perfect Sub | 7.84 |
| Weight | 58 lbs (26.3 kg) |
| Woofer Cabinet | Bass reflex, with switchable flat/cut/lifted bass ports for wall placement |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- KEF Reference 203 vs JBL 4367
- KEF Reference 203 vs Revel F226Be
- KEF Reference 203 vs KEF R5 Meta
- KEF Reference 203 vs KEF Reference 5
- KEF Reference 203 vs JBL HDI-3800
- KEF Reference 203 vs Revel F328Be
- KEF Reference 203 vs MoFi SourcePoint 888
- KEF Reference 203 vs Focal Chora 816
- See all 37 comparisons
Sony SS-CS3: $450 per pair Discontinued eBay
Newer model: the Sony SS-CS3 M2, ranked higher, estimated 3/5.
Same family: the Sony SS-CS5 (bookshelf, rated 3.5/5).
Pros: Affordable entry-level floorstanding tower offering solid sensitivity (88.6dB SPL at 2.83V/1m), making it easy to power with standard budget AVRs. Harmonic distortion remains reasonably low at moderate listening levels (86dB SPL) when high-pass filtered above 80-100Hz with a dedicated subwoofer. Front-ported design allows relatively close placement to front boundaries without excessive port occlusion. Measured bass extension of 72Hz (-3dB), with a measured sensitivity of 88.6dB.
Cons: Severe cabinet and driver resonances plague the passband between 100Hz and 600Hz, imparting audible coloration and chesty resonances to male vocals and acoustic instruments. Irregular frequency response peaks and dips make automated receiver room correction difficult to equalize effectively. Poor low-frequency extension (F3 of 72Hz, F10 of 39Hz) for a floorstander, combined with rapid distortion escalation below 80Hz at higher SPLs (96dB+). Supertweeter driver adds crossover complexity without providing audible high-frequency benefit within the human hearing spectrum. Discontinued.
Full Sony SS-CS3 review and specifications →
| Bass Extension (-10dB) | 39Hz (measured, Erin’s Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 72Hz (measured, Erin’s Audio Corner) |
| DIY Kit | No |
| Dimensions | 36.3”H x 9.1”W x 10.2”D (922 x 230 x 260 mm) |
| Drivers | 0.75 in. supertweeter, 0.98 in. polyester main tweeter, dual 5.12 in. MRC woofers |
| Impedance | 6 ohms nominal |
| Sensitivity | 88.6dB (measured average, Erin’s Audio Corner) |
| Spinorama Preference Score | 4.11 |
| Spinorama Preference Score with Perfect Sub | 6.65 |
| Weight | 25.4 lbs (11.5 kg) each |
| Woofer Cabinet | ported, front |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons