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You can see the "good" channels produced > 90dB SINAD (.002% THD) while the "Center, Sur L and Sur R" channels produced To illustrate the distortion differences between the problematic (Center, Sur L and Sur R) channels vs the better performing channels, I graphed all channels output voltage on the horizontal X-axis vs %THD+N on the left vertical Y-axis and SINAD on the right vertical Y-axis. With a digital source, “Pure Direct” still showed a measurable improvement inĭistortion as you can see with the lowest vertical traces in the graph above. Note, the distortion never went above 0.05% THD+N and likely inaudible, however. The rest of the channels tested once the output level exceeded 650Vrms.
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Identified the C, Sur L and Sur R channels produced higher distortion than Yamaha was able to output 4Vrms for all channels unclipped. Preouts (FL, C, FR, SurL, SurR, SBL, SBR) vs distortion. Input being fed a test signal from my APx585, I did a 1kHz sweep of multi-ch With the RX-A6A engaged in “Pure Direct”, and HDMI When feeding the RX-A6A analog input signals unless you absolutely want toĮngage bass management or you wish to upmix your 2CH music to German BathtubĭSP mode that Yamaha is so well known for. Yamaha uses are the culprit for the increased noise. Signal to Noise Ratio was much better (+24dB) on the analog preamp in “Pureĭirect” (106dB A-wt 2Vrms with 410mVrms input) than in “Straight Mode” (82dBĪ-wt 2Vrms with 410mVrms input). While this distortion difference is measurable, it’s unlikely to be audible. The bandwidth limited to 48kHz or ½ the 96kHz sampling rate of the unit’s DSP. “Straight” mode, the distortion went up slightly from. Those wondering if “Straight” vs “Pure Direct” makes a measurable difference, The analog preamp section is rulerįlat to the limits of my test gear (80kHz) and the distortion is incredibly low Preamp outputs we’ve seen in an AV receiver. Analogįact, with an analog input signal, the RX-A6A produced some of the cleanest This unit has 2CH XLR outputs that yieldĨVrms unclipped output.
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Outputs which is more than 2X voltage drive needed to make most externalĪmplifiers reach full unclipped power. RXA-6A is capable of outputting > 4Vrms unclipped from the multi-ch preamp More information about how we measure power amplifiers, please see: Basic Amplifier Measurement Techniques Yamaha RX-A6A Measurements were conducted using our Audio Precision APx585 8 Channel HDMIĭefaulted to high-impedance (High Z) mode (8-ohms or more) and ECO Off unless I full written review with YPAO tests will come in early 2022 and will be linked up to this report. In this test report, I put the RX-A6A through our standard Audioholics bench tests and dig a little deeper to uncover the reasons for some of the performance issues I've discovered. The RX-A6A has 11 channels of processing with 9 channels of built-in amplification rated at 150wpc. The Yamaha RX-A6A is a 9.2CH 8K ready Atmos/DTS:X Receiver that retails for $2,200 and is one step down from their new flagship the RX-A8A.