Loudspeakers
| Woofer |
Y |
| Number of mid-range drivers |
1 |
| Mid-range driver diameter |
46 mm |
| Woofer diameter |
165 mm |
| Number of speakers |
1 |
| Recommended usage |
Speaker set unit |
| Number of woofer drivers |
2 |
| Tweeter |
N |
| Amplifier |
N |
Audio
| Sensitivity |
88 dB |
| Frequency range |
36 - 35000 Hz |
| Impedance |
4 Ω |
Additionally
| Wireless technologies |
Wired |
36 - 35000 Hz, 88 dB, 4 ohms, 25 - 150 W, 31 kg, Rosewood
With twin 165mm bass drivers and a 46mm BMR in a 40 Litre enclosure, the S-400 is designed for more modest listening rooms and can be used with less ambitious Naim amplification. Low frequency response still reaches down to 36Hz however and the S-400 gives only very little away to the S-600 in terms of dynamics and maximum level. The S-400 gives nothing away in music making however.
Hardened floor spikes
Surgical grade, anti-magnetic, stainless steel M8 floor spikes define the vital mechanical connection between the speaker and the floor of the listening environment.
FEA modelled driver chassis
The Ovator bass drivers feature rigid paper cones, natural rubber surrounds and aluminium demodulations rings within their neodymium magnet systems. The linearity and resistance to compression of both Ovator models' bass drivers is outstanding.
Computer-modelled crossover
The crossover incorporates state of the art components including laminated and air-cored inductors, and metallised polypropylene capacitors.
Decoupling leaf spring
A steel leaf-spring provides the connection between the enclosure and plinth and decouples above 12Hz.
Die-cast plinth
The pressure die-cast plinth incorporates enclosure locations, housing for the crossover, and floor spike fittings with top-access adjustment.
Rigid multi-composite enclosure
The enclosure is constructed from a combination of 25mm and 50mm panels comprehensively braced to provide a rigid, non-resonant and low diffraction reference plane for the drivers. Selected panels also benefit from strategic mass-damping, and the internal bracing includes a division that creates separate loading volumes for each bass driver.
Computer-optimised bass driver
Ovator bass drivers feature rigid paper cones, natural rubber surrounds and aluminium demodulations rings within their neodymium magnet systems. The linearity and resistance to compression of both Ovator bass drivers is outstanding.
BMR Isolating Enclosure
The BMR unit in the S-400 is isolated in a nested 10mm wall thickness composite tube enclosure. The isolation tube extends the full depth of the enclosure and is gradient filled with damping materials selected through technical analysis and critical listening.
BMR driver
The S-400's BMR driver comprises a honeycomb diaphragm driven by a voice-coil immersed in a twin neodymium magnet system optimised for linearity through finite element analysis. The pressure diecast chassis provides the rigidity necessary to ensure that every last note of musical detail is accurately reproduced.
BMR Suspension
The S-400 BMR incorporates a high-Q elastomeric suspension system. The resulting isolation decouples at a frequency many octaves below the BMR pass-band.
