The Alto Cross-brace comprises two stainless-steel plates bonded with a layer of AVDC helping to further stiffen the plinth and reducing the effects of masking vibrations. The cross-brace is also the mounting bracket for internal power supplies and connector boards for external power supplies.

The Alto Cross-brace helps isolate the oscillators in internal power supplies from vibration. Removing vibration at this point can help the power supply provide more accurate control of motor timing.