Buchardt S400 MK3 Review: Rated 4.0/5

Last updated: October 30, 2026

The Buchardt S400 MK3 is rated 4/5 for sound quality, #77 of 222 Large Size Bookshelf Speakers on an estimated rating, since it has not been measured or compared side by side yet. See all Passive Home rankings for every top pick.

Buchardt S400 MK3 · Editor's rating 4/5, ranked #77 of 222 Large Size Bookshelf Speakers
Check price at Buchardt Audio ($2,300 per pair) →

Prices on this page were last checked November 11, 2026 at 3:26 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.

As an eBay Partner, we may be compensated if you make a purchase.

Brand: Buchardt

#77 Buchardt S400 MK3: $2,300 per pair Buchardt Audio $2,300 eBay

Older models: the Buchardt Audio S400 (ranked higher, rated 4.4/5) and the Buchardt S400 MKII (ranked lower, rated 3.8/5). See every Buchardt S400 generation.

Pros: A redesigned compact bookshelf speaker with a larger 7.5 inch woofer, deep rated in-room bass, port plugs, and a ten year warranty. A ground-up redesign of the S400 with an 18 percent larger cabinet and a 7.5” SB Acoustics Satori Papyrus paper cone woofer, which Buchardt says has 65.5 percent more displacement than the MKII’s 6” driver. A custom 1” aluminum dome tweeter sits in a new waveguide, crossed at 2.2kHz with a first order Jantzen crossover. Buchardt rates in-room bass extension to 33Hz and anechoic sensitivity at 87dB, and includes foam port plugs to trim bass near a wall. Sold direct with free worldwide shipping, duties included, and a 10 year warranty for the first owner.

Cons: No independent measurements have been published yet. The Buchardt S400 MKII measured very well, but the MK3 shares only its binding posts, so that result can’t be carried over and its linearity, directivity and real bass extension are unknown. The 33Hz figure is an in-room number, not an anechoic one. The MKII’s adjustable passive radiator is gone in favor of a rear port that wants at least 5cm from the wall. A 4 ohm load means it needs an amplifier comfortable driving 4 ohms, and it is sold only direct from Buchardt.

ReleasedMar 2026 (8 months ago)
Crossover Frequency2.2kHz (first order)
DIY KitNo
Dimensions15.4”H x 7.8”W x 11”D (392 x 198 x 280 mm)
Drivers1” aluminum dome tweeter in waveguide, 7.5” Satori Papyrus paper cone woofer
Frequency Response33Hz - 20kHz (in-room, manufacturer specified)
Impedance4 ohms
Sensitivity87dB anechoic, 90dB in-room (manufacturer specified)
Weight18.7 lbs (8.5 kg) each
Woofer Cabinetported, rear
Check current price at Buchardt Audio ($2,300) →Search eBay for Buchardt S400 MK3 →

Head-to-Head Comparisons

13 comparisons

More Buchardt speakers →