• 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
• + Optimum Diapragm Waveguide Geometry
• Introduction
• Sperical Waves
• Analysis Stategy
• Results
• Discussion
• Conclusion
• Download as PDF
•   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)

Discussion

It is now possible to devise a moving coil loudspeaker system where the off-axis response is dominated by the enclosure and not by driver spacing.

Elimination of the time delay between drivers makes possible the use of a wide range of theoretical filter shapes and cut-off slope order as acoustic targets. Previously, higher order targets, although theoretically possible, were not realisable in practice because of the phase shift caused by inter-unit time delay. Higher order electrical filters allow designers the possibility of diluting system acoustic variability by providing greater attenuation of the most variable regions of the drivers' ranges, namely tweeter fundamental resonance and woofer hf cut-off.

Further improvements have been made to more recent generations of Uni-Q drivers. These include changes to the tweeter horn profile to eliminate unwanted cavity resonances and changes to the woofer surround shape to minimise its effect on the axial hf response of the tweeter.

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