Sigma Acoustics · Bookshelf
Overture
A handcrafted 2-way reflex bookshelf bearing the Sigma artisnship signature, the Heil AMT tweeter, and over twenty years of refinement.
Technology
Sound comes to life.
Overture demonstrates our commitment to harnessing the power of innovation through classical craftsmanship. The next-generation Heil AMT tweeter, mounted on a dedicated waveguide, delivers extended, airy high frequencies free from harshness.
The 165 mm loaded-cellulose woofer — developed to our own specification — ensures speed of response and bass control even at the limits of its class. Internal wiring is Litz wire, multi-strand low-skin-effect conductors.
Design
Timeless craftsmanshipand contemporary engineering.
In the Overture loudspeakers, the cabinet design recalls the elegance of stringed instruments: high-density MDF panels with cellular internal bracing, differential damping to minimise cabinet resonances.
Surfaces are finished by hand in mirror-polish polyester lacquer in three signature shades. The optional stand completes the system with a fillable steel structure that brings the speaker to the correct listening height.
Every unit listened to for hours before leaving the workshop. A signature, a personal guarantee.
Dedicated accessory
Overture Stand.
The Overture stand, with its slim steel design and fillable base, is made exclusively for the Overture bookshelf loudspeaker. It brings the speaker to the correct listening height and improves its mechanical behaviour.
Technical specifications
Data sheet
All relevant parameters for the integration and technical evaluation of the Overture model.
Complete technical documentation, CAD files and frequency response curves are available on request.
| Type | Shelf or stand-mounted bookshelf · 2-way |
| Loading | Bass-reflex with flared rear port · "Stealth Woofer" system |
| Drivers | 1 × Heil AMT tweeter · 1 × 165 mm cellulose-loaded woofer |
| Crossover frequency | 2,500 Hz · first order, 6 dB/octave |
| Frequency response | 42 Hz – 33 kHz (-3 dB) |
| Sensitivity | 87 dB / 2.83 V / 1 m |
| Nominal impedance | 6 Ω (minimum 4.2 Ω @ 180 Hz) |
| Recommended power | 30 – 180 W per channel |
| Internal wiring | Multi-strand Litz wire |
| Dimensions (H × W × D) | 360 × 215 × 290 mm |
| Weight | 9.4 kg / each |
| Standard finishes | Piano black · Ivory · Canaletto Walnut |
| Optional stand | Overture Stand · 580 mm h · fillable steel |
| Connections | Single WBT-0710 Ag binding post |
| Warranty | 10 years on cabinet · 5 years on components |