JBL Project K2 S5800 Review: Ranked #103 of 163

Last updated: October 7, 2026

The JBL Project K2 S5800 ranks #103 out of 163 total Large Size Floorstanding Speakers for sound quality. See all Passive Home rankings for every top pick.

Brand: JBL

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JBL Project K2 S5800 - ranked #103 of 163 Large Size Floorstanding Speakers · Editor's rating 4/5

#103 JBL Project K2 S5800: $20,000 per pair Discontinued eBay

Pros: A three-way horn tower with two 12” Kevlar-composite woofers, a 3” aluminium compression driver and a 1” titanium ultra-high-frequency driver on Bi-Radial horns. Sensitivity is very high at 95dB. Measurements show a preference score of 4.77 that reaches 6.77 with an ideal subwoofer, with 0.41 listening window deviation. Measured bass extension of 59.2Hz (-3dB).

Cons: JBL no longer makes it. Bass reaches 59.2Hz (-3dB) and about 33Hz (-10dB). That data is low quality. Discontinued.

How it compares: Just above it: Bowers & Wilkins Nautilus 802 - $6000 cheaper, 4Hz lower bass extension (-3dB). Just below it: Monolith THX-365T - 6.4Hz lower bass extension (-3dB).

Bass Extension (-10dB)about 33.4Hz (measured, third-party data via spinorama.org)
Bass Extension (-3dB)59.2Hz (measured, third-party data via spinorama.org)
DIY KitNo
Drivers2x 12” Kevlar-composite woofers, 3” aluminium compression driver, 1” titanium UHF compression driver on Bi-Radial horns
Frequency Response50Hz-40kHz -6dB (manufacturer specified)
Impedance8 ohms
Sensitivity95dB (2.83V/1m, manufacturer specified)
Spinorama Preference Score4.77
Spinorama Preference Score with Perfect Sub6.77

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