Frequency response of the TTR driven by 5-ohm (blue trace) and 75-ohm (green trace) output impedance, with results normalized at 1 kHz.
When I added 70 ohms output impedance to the V-Can’s 5-ohm output impedance to simulate the effects of using a low-quality headphone amp, there was almost no difference in response, just a boost of +0.5 dB at frequencies below 100 Hz.
