Gas spring and gas damper assemblies, suspension systems and methods

A gas spring and gas damper assembly comprising:

• a first end member;
• a second end member spaced longitudinally from said first end member such that a longitudinal axis is formed therebetween;
• a flexible spring member secured between said first and second end members such that a spring chamber is at least partially defined by said flexible spring member between said first and second end members;
• a first damper reservoir having a substantially-fixed volume disposed within one of said first and second end member;
• and,
• an elongated gas damping passage fluidically connected between said spring chamber and said first damper reservoir, said elongated gas damping passage operative to generate pressurized gas damping of vibrations across a predetermined range of frequencies.