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Yamaha RX-V2700 Measurements and Analysis

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Amplifier Efficiency
Amplifier Efficiency Measurements for linear a/b amps such as the ones employed in this receiver typically range from 40-50% depending on the load the power supply of the amplifier sees.  The closer you get to full load, the higher the efficiency usually becomes (assuming you aren’t overtaxing the power supply and power devices of the amp causing excessive thermal losses).  The RX-V2700 achieved above 50% efficiency when driven at near full power into low impedance loads which was quite impressive for a receiver employing a conventional linear amp design.  This receiver runs warm as it dissipates 72 watts in idle so be sure to give it plenty of ventilation.

# Ch
Driven

Power Consumption

Power Delivered

Load

Efficiency

1

288 watts

144 watts

8 ohms

50 %

4

765 watts

90 watts

8 ohms

47 %

1

513 watts

272 watts

4 ohms

53 %

2

774 watts

230 watts

4 ohms

59 %

Idle Power

72 watts

Note: All power output figures above were conducted at 1kHz and 0.1% THD + N 

 Power Bandwidth 

freq-full
 

Figure 4. Yamaha RX-V2700 Frequency Response at 1 watt & Full Power

The Yamaha RX-V2700 possesses a wide bandwidth amplifier topology with a -3dB point in excess of 100 kHz at 1 watt.  At full power, we start seeing some loss of bandwidth but the -3dB point is still above 70 kHz (well beyond the range of human hearing).

At full continuous unclipped power and bandwidth (> 0.1% THD + N) the RX-V2700 delivered the goods, 144wpc x 1 and 90wpc x 4 (bi-amp mode) into 8 ohm loads, while still maintained excellent bandwidth linearity with a -3dB point of 70kHz.

Into 4 ohms, the RX-V2700 was able to deliver continuous power levels at a whopping 272wpc x 1 and 230wpc x 2 with less than 0.1% THD + N.

Keep in mind most review publications don’t do continuous power measurements and they usually publish power measurements into clipping at 1% THD + N. Our measurements are very conservative and it is clear that this receiver is among the most powerful in its price class.

For more info on amplifier measurements, see:  The All Channels Driven (ACD) Test 

FFT Distortion Analysis

FFT-1watt

Figure 5. FFT Analysis @ 1 watt

At 1 watt into 8 ohms, the RX-V2700 displayed exemplary results (+8.963 + 90.975)dBv = 99.94dBv or 100*alog^-1(-99.94/20) = .001% THD + N.

FFT-140watt

Figure 6.  FFT Analysis @ 140 watts 

At full rated power (140wpc, 8 ohms) the RX-V2700 again exhibited excellent distortion measurements (30.336 + 58.368)dBv =88.7dBv or 100*alog^-1(-88.7/20) = .0037 THD + N 

Amplifier Output Impedance & Damping Factor 

Zout

Figure 7. Amplifier Output Impedance under various loading conditions

The amplifier output impedance fell right within our desired 100 mohm or less mark for the entire audible bandwidth up to 20kHz.  It was nice to see that even when the RX-V2700 was pumping out 200wpc into a 4 ohm load, the amp maintained good linearity.  This is a marked improvement over Yamaha predecessor units in this price class and is among the best compared to its peers.

damping1

Figure 8. Amplifier Damping Factor under various loading conditions

The amplifier damping factor is about what I expected based on the measured output impedance.  It is uniformly good across the entire audio frequency range and falls slightly under the 100 mark (50 is a minimum we like to see in all amplifiers) when driving an 8 ohm load above 1kHz we like to see on uncompromising designs.  The amplifier doesn’t fall apart when driving 4 ohm loads like some of Yamaha’s earlier models.

Preamplifier Performance
The RX-V2700 preamp output drive was a bit disappointing and a step backwards from its predecessor

  • The Inputs can handle 2.7Vrms unclipped!

  • Outputs Deliver nearly 3Vrms output before the receiver shut down, but FFT distortion becomes very high once output exceeds 1.25Vrms.

    Editorial Note on Preamp Clipping
    We would prefer to see Yamaha employ a preamp capable of delivering 2Vrms unclipped to ensure a wider variety of power amplifiers can be mate well.  If for example you choose a power amp with the typical 29dB gain structure (THX standard), you would only be able to deliver about 155wpc (1.25 * alog(29/20)) continuously unclipped into an 8 ohm load.  A preamp capable of delivering 2Vrms unclipped would allow the amp to deliver over 400wpc into an 8 ohm load!

Signal to Noise Ratio (SNR)

Preamp
200mV Input Signal, I adjusted master volume for 1Vrms out.

Av = 5 or 14dB
SNR: 80.6dB  <10 Hz - 22k Hz bandwidth , no option filter.  This is very good performance and will ensure the RX-V2700 wont serve as a significant noise path to a mating power amplifier. 

Power Amp
200mVin; SNR @ 1 watt = 79.6dB  <10 Hz - 22k Hz bandwidth , no option filter.

SNR @ full power = 102.68dBrA at 30.7dBv at .98% THD + N (146 watts)

Again this is commendable performance which explains why noise was never a distracting issue when listening to music or movies on this receiver.

 

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