​​

His first was the Model 6, followed by the Model 7 and Model 8. During that time, various custom commissions and specialty model speakers were also produced

​

In addition to building speakers, the last five years has seen extensive research conducted by Coherent Audio.

 

The focus of Frank's research was to : 

​

Design and build an accessibly priced speaker that would most realistically deliver the micro-dynamics, vividness, dimensionality and excitement of live music

​​​

After numerous prototypes, extensive listening tests and continuous design refinements, Frank determined that the best way to achieve the  desired objectives would be through a high sensitivity and high quality full range co-axial driver.

​

And after over 10 years of passionate effort we are now

able to enjoy his wonderful Golden Ratio Line