The TR1000 series are 100-volt line transformers designed to match impedance between loudspeakers and amplifiers. They are used to convert low-impedance loudspeakers, allowing them to be used in 100-volt PA installations where long cables may be required.

The transformers have an oversized core, which minimizes saturation and provides a noticeable improvement in sound reproduction quality, especially at low frequencies. Various 100V inputs are available, and the output impedance can also be selected depending on the transformer used.