• Technology
• + Voice Coil Impedance
• Introduction
• Glossary
• Lumped Impedance Modelling
• Measurement
• Fem Modelling
• Prediction of Distortion
• Conclusion
• Download as PDF
• + Surround Sound with Fewer Speakers
• Introduction
• Sound Quality Objectivies
• Creating Virtual Soundfields
• Practical systems
• Conclusion
• Download as PDF
• + Optimum Diapragm Waveguide Geometry
• Introduction
• Sperical Waves
• Analysis Stategy
• Results
• Discussion
• Conclusion
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•   Pod Technology
• + Uni-Q White Paper
• Introduction
• Background
• Co-Axial Drivers
• Co-Incident Drivers
• Magnetic Design
• Acoustics
• Discussion
• Conclusion
• References
• Full Paper (PDF)
• + High End Uni-Q
• Coincident Source Array
• Finite Element Analysis
• Dome Profile
• Wavefront Analysis
• Motor Systems
• Laser Vibrometry
• References
• + Reference Paper
• Introduction
• Research & Development
• Reference 207
• Production
• System Design
• Boundary Control Device
• + ACE Technology
• Introduction
• How Does ACE Work?
• Adsorption
• Improvements
• Performance
• Applications
• Technology
• References
• Full Paper (PDF)

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Performance Issues

Effective Frequency Range

The ACE process is principally effective below about 100Hz (figure 3). Above this frequency performance deteriorates because the cycle time becomes too short for adsorption and desorption fully to take place.

Moisture

There is a strong relationship between the tendency of an activated carbon to adsorb air and its tendency to adsorb water vapour. Adsorption of water vapour adversely affects the Compliance Enhancement because the water molecules block the pores and prevent air adsorption. Therefore we have two basic requirements of the carbon - 1) that it is kept as dry as possible, and 2) that its ‘water uptake’ is minimal. The former is a function of the packaging design and the latter a design issue for the carbon chemist.

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