![]() ![]() ![]() The high sample-rate response rolls off rapidly above 40kHz, but is flat almost to that frequency rather than continuing the slight rolloff in the top audio octave with CD data. The Transporter's frequency response at –12dBFS is shown in fig.1, taken with both 44.1kHz and 96kHz data from the balanced outputs (the unbalanced output response was identical). The cute VU-style meters registered a sinewave at –8dBFS as "0dB" and had a very short attack time. The source impedance from the unbalanced RCA jacks was a low 100 ohms across the audioband, and exactly twice that from the balanced XLRs. The maximum output levels at 1kHz were to specification at 3.11V RMS (balanced) and 2.07V RMS (unbalanced), and both outputs preserved absolute polarity ie, were non-inverting. It did play 24-bit AIF files, but while SlimServer would recognize 24-bit WAV files stored as 32-bit data words, the Transporter would not play them. The Transporter successfully handled files with 44.1kHz, 48kHz, and 96kHz sample rates-but not 88.2kHz, which I felt was a shortfall, as almost all of my own hi-rez files are recorded at that rate. Some measurements were repeated using a TosLink optical connection from a PC fitted with an RME soundcard. The 16-bit files were Apple Lossless, the 24-bit files were AIF. The source signals for almost all the measurements were 16-bit and 24-bit data files accessed from a Mac mini running the necessary SlimServer software via my WiFi network. All the measurements were performed on the replacement Transporter with its volume control set to its maximum and its internal attenuation set to 0dB. ![]()
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