Dr. Nesper is a historic external speaker, likely dating back to the 1920s. These devices were used to amplify sound for early radio receivers, which often lacked built-in speakers.
The name "Dr. Nesper" refers to the manufacturer or brand, though little information about its origins is available today.
Initially, these speakers featured a simple corner horn, typically made of hammered metal—a design borrowed from earlier mechanical sound devices like phonographs and gramophones. Later models were encased in decorative cabinets adorned with brocade and grilles, giving them a more refined look in line with the aesthetics of their era.