High pressure

High pressure stops distribute their impressive acoustic power over wind pressures of 200 to 300 mm water column. Containing such unusually high pressures calls for unusual means. Our swell box with its special absorption chamber is a perfect example of how organ building techniques and a knowledge of physics can be combined to produce improvements in overall quality.

Wedge-bellows control

Used with historic instruments, Kuhn‘s wedge-bellows control produces the wind normally supplied by pumping. Even in organs with a motorized supply, it provides an authentic winding. The blower first inflates a bellow. The connection to the blower is then cut off, while the valve to the windchest simultaneously opens. The bellow is now able to supply the natural wind to the organ without any negative effect from the motor.