SR7002 Measurements and Analysis Report

Measurements and Commentary by Gene DellaSala

Frequency Response

Marantz SR7002 Frequency Response

The -3dB point for the SR7002 was around 125kHz at 1 watt and full power illustrating a very uniform power response which is to be expected with a receiver of this caliber.

Marantz SR7002 Power vs Distortion

I measured continuous power vs distortion by setting up a regulated sweep in my Audio Precision to automatically adjust input level until the maximum power output is achieved at < 0.1% THD + N. The SR7002 was plugged directly into an APC S-15 Power Conditioner with regulation to ensure the line never dropped below 118Vrms.

Power output: <0.1% THD + N

• 144wpc x 1 @  8-ohms
• 128wpc x 2 @ 8-ohms
• 180wpc x 1 @ 4-ohms
• 170wpc x 2 @ 4-ohms

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 the 110wpc power rating of this receiver is greatly understated as Marantz is delivering MUCH more than specified.

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

FFT Distortion Analysis

Marantz SR7002 FFT Distortion Analysis at Full Rated Power

At full rated power (110wpc, 8 ohms) the SR7002 exhibited very good distortion measurements (28.75+ 47.33)dBv =83.5dBv or 100*alog^-1(-76.1 /20) = .002 THD + N. These results (especially odd order harmonics) weren’t quite as low as I measured on similar priced Yamaha and Denon receivers but still good nonetheless.

SNR @ 1 watt

With 200mV in and driving the amp to 1 watt at 8-ohms, I measured a good Signal to Noise Ratio of around 70dB (unweighted).

Output Impedance vs Frequency

Marantz SR7002 Output Impedance vs Frequency

The SR7002 exhibited respectably low output impedance maintaining around 100mohms for the audible frequency range of 20Hz to 20kHz when driving 8-ohm and 4-ohm loads. This ensures that the amp will perform consistently under a wide variety of speaker loads.

Marantz SR7002 Damping Factor vs Frequency

The SR7002, displayed a good damping factor which was not surprising based on the low output impedance the amp section exhibited. The damping factor for the SR7002 maintained above the minimum of 50 we like to see when driving an 8-ohm load and roughly 1/2 that (as it should) when driving 4 ohm loads.