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Industrial Research Products is the only company to have brought an analogue transversal equaliser to market. It blends delay line technology with a traditional graphic equaliser layout to produce a unique, linear-phase equaliser
“Industrial Research Products was founded by Maylon Burkhardt who invented the zero-phase shift transversal eq, completely analogue and as the name implies, zero phase shift no matter how radical the eq setting. They were based in a suburb of Chicago, and rumour has it that Maylon was an ex alumni of early Shure Brothers.
I used a lot of their products in the 80’s on commercial AV jobs, and I did some custom simultaneous translation projects where I used their wonderful Voice Matic automatic mixers and the transversal eq’s. The company fell into hard times in the mid 90’s and was purchased by their German distributor.
The Grateful Dead would ONLY use the Transversal EQ for many years. Great products and sad to see that they have virtually disappeared. I don’t believe a digital implementation of the transversal eq can be as clean” – Wards, Gearslutz