Short answer: the JBL HDI-3600 for sensitivity and low distortion; the KEF R5 for controlled directivity. The JBL’s high 90dB sensitivity and very low midrange distortion make it easier to drive, though a wide shelving-down above 2kHz colors the in-room response. The KEF’s Uni-Q keeps off-axis response tracking the direct sound for stable imaging, but its 77Hz F3 against 33Hz F10 calls for a subwoofer and 80Hz high-pass.
Buy the JBL HDI-3600 new; the KEF R5 is no longer sold new, so it only makes sense as a used find.
Looking for alternatives? See the complete Passive Home rankings.
Specifications Side By Side
| KEF R5 | JBL HDI-3600 | |
|---|---|---|
| Price | $2,999 per pair Discontinued | $3800 per pair |
| Ranked | #22 of 74 in Large Size Floorstanding Speakers | #31 of 74 in Large Size Floorstanding Speakers |
| Bass Extension (-3dB) | 77Hz (measured, Erin’s Audio Corner) | 78Hz - the on-axis curve also shows an unusual step/dip around 40-55Hz that may be a near-field-scan artifact for this tower (measured, Audio Science Review) |
| Bass Extension (-10dB) | 33Hz (measured, Erin’s Audio Corner) | 62Hz - the on-axis curve also shows an unusual step/dip around 40-55Hz that may be a near-field-scan artifact for this tower (measured, Audio Science Review) |
| Sensitivity | Approximately 86dB/2.83V/1m (measured, Erin’s Audio Corner) | 89.5dB (2.83V/1m, measured, Audio Science Review) |
| Impedance | Approximately 3.5 ohms minimum near 150Hz (measured, Erin’s Audio Corner) | 4 ohms nominal |
| Drivers | 1” aluminum tweeter coaxial with 5” midrange; dual 5.25” woofers | 2410H-2 1” compression driver, 3x 6.5” Advanced Aluminum Matrix woofers |
| Dimensions | 40.4”H x 6.9”W x 13.5”D | 40.5”H x 10.2”W x 13.5”D (1029 x 260 x 343 mm) |
| Weight | 59.5 lbs (27 kg) each | 61.7 lbs (28 kg) each |
| Woofer Cabinet | ported, rear | ported, dual rear-firing |
| Spinorama Preference Score | 5.78 | 4.64 (spinorama.org) |
| Spinorama Preference Score with Perfect Sub | 7.40 | 6.95 (spinorama.org) |
| DIY Kit | No | No |
| Frequency Response | - | 38Hz - 30kHz (+/-3dB) (Manufacturer specified) |
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Prices on this page were last checked October 3, 2026 at 10:26 PM 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 R5: $2,999 per pair Discontinued eBay
Pros: Slim three-way tower with the acoustic advantages of KEF’s coincident Uni-Q midrange/tweeter: horizontal and vertical off-axis responses track the direct sound smoothly, producing stable imaging and a well-behaved directivity index. Erin measured deep low-frequency reach for the cabinet width (77Hz F3 but 33Hz F10) and less than 1% harmonic distortion at 86dB. At 96dB it remains clean when high-passed, and its mild response deviations are suitable for equalization because the radiation pattern stays orderly. Measured bass extension of 77Hz (-3dB), with a measured sensitivity of 86dB.
Cons: The unusual gap between 77Hz F3 and 33Hz F10 indicates a gradual bass contour rather than flat deep-bass output; a subwoofer and roughly 80Hz high-pass are recommended for high-level playback. Erin measured a minimum near 3.5 ohms around 150Hz, although most of the curve remains above 4 ohms, so amplifier quality still matters. Sensitivity is approximately 86dB/2.83V/1m. At 102dB, compression reaches roughly 1dB around 150Hz, showing the limits of the twin 5.25-inch woofers. This original model lacks the Meta version’s MAT rear-wave absorption. Discontinued.
Full KEF R5 review and specifications →
| Bass Extension (-10dB) | 33Hz (measured, Erin’s Audio Corner) |
|---|---|
| Bass Extension (-3dB) | 77Hz (measured, Erin’s Audio Corner) |
| DIY Kit | No |
| Dimensions | 40.4”H x 6.9”W x 13.5”D |
| Drivers | 1” aluminum tweeter coaxial with 5” midrange; dual 5.25” woofers |
| Impedance | Approximately 3.5 ohms minimum near 150Hz (measured, Erin’s Audio Corner) |
| Sensitivity | Approximately 86dB/2.83V/1m (measured, Erin’s Audio Corner) |
| Spinorama Preference Score | 5.78 |
| Spinorama Preference Score with Perfect Sub | 7.40 |
| Weight | 59.5 lbs (27 kg) each |
| Woofer Cabinet | ported, rear |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
JBL HDI-3600: $3800 per pair Audio Advice eBay
Pros: CEA2034 spinorama shows a fairly even on-axis response and flat overall frequency response, with high 90dB sensitivity and very low distortion through the midrange. Triple 6.5” Advanced Aluminum Matrix woofers and a 1” compression driver in JBL’s HDI waveguide. Measured bass extension of 78Hz (-3dB), with a measured sensitivity of 89.5dB.
Cons: A wide shelving-down above 2kHz affects the in-room response, and vertical dispersion is a bigger issue than horizontal: the reviewer noted the dip is wider here than on the smaller HDI-1600, making it more audible. Narrow vertical sweet spot means careful listener-height positioning matters more than usual.
Full JBL HDI-3600 review and specifications →
| Bass Extension (-10dB) | 62Hz - the on-axis curve also shows an unusual step/dip around 40-55Hz that may be a near-field-scan artifact for this tower (measured, Audio Science Review) |
|---|---|
| Bass Extension (-3dB) | 78Hz - the on-axis curve also shows an unusual step/dip around 40-55Hz that may be a near-field-scan artifact for this tower (measured, Audio Science Review) |
| DIY Kit | No |
| Dimensions | 40.5”H x 10.2”W x 13.5”D (1029 x 260 x 343 mm) |
| Drivers | 2410H-2 1” compression driver, 3x 6.5” Advanced Aluminum Matrix woofers |
| Frequency Response | 38Hz - 30kHz (+/-3dB) (Manufacturer specified) |
| Impedance | 4 ohms nominal |
| Sensitivity | 89.5dB (2.83V/1m, measured, Audio Science Review) |
| Spinorama Preference Score | 4.64 (spinorama.org) |
| Spinorama Preference Score with Perfect Sub | 6.95 (spinorama.org) |
| Weight | 61.7 lbs (28 kg) each |
| Woofer Cabinet | ported, dual rear-firing |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons