The line matching 16W transformer shall be Lowell Model TLM-1670A. Primary voltage shall be 70V with a power rating of 16 watts. Primary taps shall be available at 16/8/4 watts. Secondary impedance taps shall be available at 8 ohms and 4 ohms. All taps shall have clearly marked color-coded leads. Frequency response of the transformer shall be 50Hz–15kHz (±1dB) with insertion loss not to exceed 0.6 dB.