Yamaha SX Series Comparison Chart: S3X, S5X, S6X and S7X

The SX series is Yamaha’s premium grand piano line, between the CX series and the hand-built CF concert grands. Yamaha makes it in four lengths, the same as the four largest CX models, and builds it differently: the rims are seasoned with Yamaha’s Acoustic Resonance Enhancement (A.R.E.) process, the hammers use a felt made for this series, and the back frame and soundboard borrow from the CFX concert grand. This chart compares the four SX models, then the SX with the CX.

The Differences in Brief

• S3X (6’1″): the SX for the home and smaller performance spaces.
• S5X (6’7″): more power in the bass, for larger rooms and performance spaces.
• S6X and S7X (7′ and 7’6″): for recital rooms and chamber halls; a little wider and taller than the S3X and S5X.
• All four: A.R.E.-treated rims with wood more than 30% thicker than the earlier S series, back frame beams about 20% thicker, a European spruce soundboard, hand-wound bass strings, and Silent and Disklavier ENSPIRE PRO versions.

Yamaha SX Series Specifications

Specifications from Yamaha (Yamaha’s SX series specifications and features pages, Silent Piano and Disklavier ENSPIRE pages).

Yamaha SX vs CX

The SX and CX series share the larger lengths, the V-Pro frame and the Ivorite key tops. The SX is built with Yamaha’s premium construction; the CX, Yamaha’s professional line, also comes in two smaller sizes.

Head-to-Head Comparisons

Yamaha S3X vs C3X

Both are 6’1″ with Ivorite key tops and a V-Pro frame. The S3X adds the SX series’ A.R.E.-treated rims, its own hammer felt, back frame beams about 20% thicker than the earlier S series and a soundboard attached with techniques from the CFX concert grand. It weighs 728 lb to the C3X’s 704 lb and rolls on double casters.

Yamaha S5X vs C5X, S6X vs C6X and S7X vs C7X

The same pairing at each length, with the same SX construction. The weights: S5X 772 lb and C5X 770 lb; S6X 859 lb and C6X 893 lb; S7X 904 lb and C7X 913 lb.

Yamaha S3X vs S5X

6’1″ and 6’7″. Yamaha describes the S3X as suited to the home and smaller performance spaces, and the S5X, with its more powerful bass, to almost any performance space.

Yamaha S6X vs S7X

7′ and 7’6″, 859 lb and 904 lb. Yamaha suits the S6X to recital rooms and the S7X to chamber halls and recital rooms.

Which Is Right for You?

Choose the length for the room, as with any grand: allow the piano’s length plus about 2 feet for the bench. Then play an SX and a CX of the same length back to back; the difference is in the warmth and sustain of the tone, and it is easiest to hear in the middle and the bass. Our CX series chart covers the CX models in detail.

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