Прочие устройства — Lindemann HT-70 II cu

The HT-70 II cu, listed by Line Magnetic as the HT-70Cu, is a field-coil horn tweeter that combines copper and aluminium in its construction. It is part of the Line Magnetic range of horn units derived from vintage Western Electric designs, where the related HT-70II draws on the original WE597.

Key specs that matter

The tweeter covers 3kHz to 30kHz, with an input sensitivity of 106dB and a power rating of 15W. As a field-coil unit it needs a DC excitation supply of 160V at 50mA.

Engineering and use context

The high sensitivity lets the HT-70Cu sit alongside efficient horn midrange and bass drivers in multi-way horn setups fed by small tube amplifiers. A separate exciter must be provided for the coil, and its lower frequency limit calls for a crossover that keeps lower frequencies away from the driver.