What is the fine-grained topic of the following text: For example, Mr. Klipsch related that when he was developing a smaller speaker for use between two Klipschhorns, an acquaintance declared that he couldn’t possibly introduce it to the public because it was in direct violation of Mr. Klipsch’s own corner horn principles, and amounted to acoustic heresy. Only return the topic.
Development of a smaller speaker by Mr. Klipsch