Ken Kreisel的超低音設計理念
相較於現代的主動式超低音大多使用數位EQ,檢測環境中的低頻輸出並與原來訊號對比作修正,從而達到降低失真;Ken覺得從輸出訊號到輸入訊號進行比對的過程中會有一定程度的延遲,儘管測出來的數據很好看,可是聽起來卻不怎麼自然。因此,他一直堅持推挽式低音設計,因為這種設計的好處是可以降低失真。
"Regarding the use of 15" drivers: this is a very long technical discussion which can be controversial, but it really depends on what your design goal is.
Designing a subwoofer (driver, cabinet, amplification) and subwoofer driver is similar to designing a car. You can design a high speed race car (maximum acceleration and velocity and handling are most important) or you can design a monster truck. When you design for the top recording engineers (especially sound designers who are creating cutting edge sound effects) you want a world-class race car.
Transient response should never be sacrificed for maximum output, which is the problem with most subwoofers. The worse the transient response is in a subwoofer the easier it is to get more SPL at very low frequencies. I am sure there are some speaker design engineers who will disagree with me, just like a lot of subwoofer designers use ports or passive radiators which have very bad transient response but give you some extra "free" bass output at and around the port's or passive radiator's resonant frequency.
I have experimented through the years with various size subwoofer drivers including 15", 18", 24", 30". In my experience, properly designed 12" subwoofer drivers in a properly designed push-pull configuration and optimized amplification can give you the best overall transient and maximum SPL output performance and if you want more SPL output you simply add more 12" push-pull drivers so you maintain the transient response and sonic benefits of that properly designed 12" push-pull driver system.
Dual 8" push-pull drivers also have their own sonic benefits."