Friday, September 30, 3:15 pm — 4:15 pm (Rm 403A)
Bryan Martin, McGill University - Montreal, QC, Canada; Centre for Interdisciplinary Research in Music Media and Technology (CIRMMT) - Montreal, QC, Canada
P14-1 The Fender 5F6-A Bassman Circuit: A 21st Century Adaptation—Bryan Martin, McGill University - Montreal, QC, Canada; Centre for Interdisciplinary Research in Music Media and Technology (CIRMMT) - Montreal, QC, Canada
This investigation involves the design of a guitar amplifier conducive to low-volume environments, such as the home studio. Design goals were increased headroom, a relatively flat frequency response (in the context of classic American and British designs), and exceptional tone at low volume. This lead to the adaptation of the Fender 5F6-A circuit. Measurements of the completed unit are provided as well as assessment by guitarists. All design goals were met.
Convention Paper 9649 (Purchase now)
P14-2 Design of Efficient Sound Systems for Low Voltage Battery Driven Applications—Niels Elkjær Iversen, Technical University of Denmark - Kogens Lyngby, Denmark; Rien Oortgiesen, Merus Audio - Herlev, Denmark; Arnold Knott, Technical University of Denmark - Kgs. Lyngby, Denmark; Michael A. E. Andersen, Technical University of Denmark - Kgs. Lyngby, Denmark; Mikkel Høyerby, Merus Audio - Herlev, Denmark
The efficiency of portable battery driven sound systems is crucial as it relates to both the playback time and cost of the system. This paper presents design considerations when designing such systems. This include loudspeaker and amplifier design. Using a low resistance voice coil realized with rectangular wire one can boost the efficiency of the loudspeaker driver and eliminate the need of an additional power supply. A newly developed switching topology is described that is beneficial to near-idle efficiency (< 2 W), which is crucial for real audio applications in the consumer electronics space. A small sized sound system was implemented using the discussed design considerations. The amplifier efficiency performance was found to be very high with near-idle efficiency reaching a remarkably 88% at 2W. The average output SPL was estimated to be up to 90 dB in half spheric anechoic conditions. Measured results are compared with current state-of-art and shows a 14% points efficiency improvement.
Convention Paper 9650 (Purchase now)