Model 155 Mignon – New size, No compromise!

For the first time in ten years, Bösendorfer has decided to design a brand new grand piano model. The new instrument is aimed at the grand piano segment under 170 cm in length. With the new 155 cm grand piano, Bösendorfer can expand its product range by offering an instrument in a highly compact size.

Total focus on our traditional Bösendorfer quality features is as relevant to the conceptual design of the new model as it is for our existing range of models. This holds especially true for the resonance case principle, which is decisive for the special sonic properties of Bösendorfer instruments. The unique variety of colours and the special warmth of the timbre have distinguished the Bösendorfer sound since our beginning in 1828.

New Grand Piano Model 155

Length: 155 cm · Width: 151 cm · Keys: 88
646 lbs/293 kg net

The design concept:

At the same time, the concept has been developed in order to incorporate a high degree of state-of-the-art manufacturing technologies. For the construction of individual components, 2- and 3-dimensional construction design drawings were produced with CAD-assisted design software. This precise data can be used for the production process by CNC machining centres that are employed both in machining the cast iron frame and in wood processing during the manufacture of the piano’s body and case parts. This method is already used by Bösendorfer in manufacturing, yet for model 155 the proportion of CNC-assisted production has been further expanded and refined.

The string diapason is divided into four sections, whereby the lowermost six choirs of the middle register use copper-wound strings as in the bass. This is a successful method of compensating for the limited length ratios. The strings are single-strung, as is customary with Bösendorfer. The separately cast, screwed-on capodaster, and the open pin block are a must for the new model.

An absolute innovation

An absolute innovation has been the making of the cast iron pattern, including the mould equipment, with the aid of a constructive 3D model, for manufacturing the cast iron frame. This pattern was developed by our own construction department in accordance with the foundry’s specific requirements. Both the cast iron pattern, which had to be made from hard wood larger than the finished size (given the shrinkage factor of cast iron), and the mould equipment, had to be milled with exceptional precision by our proprietary CNC wood processing centre.
Despite the increased use of modern manufacturing technologies, the proportion of handcraft in manufacturing the grand piano is and remains dominant. Our experienced instrument builders’ exceptional know-how and flair is irreplaceable in many areas of manufacturing. Only the symbiosis of craft skills and modern technology results in a sound concept for the highest-quality, yet cost-effective, manufacturing of a Bösendorfer grand piano.

Sonic characteristics:

The model 155’s sonic potential, given its compact dimensions, is remarkable and is optimally assisted by the resonance case principle. The familiar Bösendorfer sound is even present in the bass register and contributes to the piano’s exceptionally balanced sound. The expression “baby grand” is really only applicable to the 155’s external dimensions – the grand piano is in no way a “baby” in terms of sonic possibilities.

Action:

So that no compromises are made in the instrument’s playability, the same key length was used in the 155 as for models 170 through 200. A thoroughly proven and technically mature action geometry is thereby available. The piano’s optimal playability is thus guaranteed and it can meet the highest demands of any pianist.

Case:

Externally, the new grand piano appears in typical Bösendorfer garb. Due to its compact size, the body exhibits no corner joints – like the model 170. The shapes of the case parts, such as the music rack, fallboard, lid, etc., are identical to those of the standard models.

BSD_product_sheet_155.pdf (2196 KB)