ATI AT527NC and AT524NC Amplifiers Review Test Bench

Test Bench

ATI AT527NC Amplifier

Two channels driven continuously into 8-ohm loads:
0.1% distortion at 256.1 watts
1% distortion at 290.5 watts

Five channels driven continuously into 8-ohm loads:
0.1% distortion at 213.7 watts
1% distortion at 250.6 watts

Seven channels driven continuously into 8-ohm loads:
0.1% distortion at 197.7 watts
1% distortion at 239.3 watts

Frequency response RCA input:
–0.13 dB at 10 Hz
–0.03 dB at 20 Hz
–0.40 dB at 20 kHz
–4.53 dB at 50 kHz

Frequency response XLR input:
–0.12 dB at 10 Hz
–0.02 dB at 20 Hz
–0.49 dB at 20 kHz
–4.72 dB at 50 kHz.

317atiamps.meas.jpg

This graph shows that the AT527NC’s left amplifier channel, with two channels driving 8-ohm loads, reaches 0.1% distortion at 256.1 watts and 1% distortion at 290.5 watts. Into 4 ohms, the amplifier reaches 0.1% distortion at 377.2 watts and 1% distortion at 475.5 watts. An input level of 107.3 millivolts was required to produce an output of 2.83 volts into an 8-ohm load, indicating an overall gain of +28.45 decibels using the RCA input. When using the XLR input, a level of 107.2 millivolts was required to produce an output of 2.83 volts into an 8-ohm load, indicating an overall gain of +28.44 decibels.

THD+N from the amplifier was less than 0.002% at 1 kHz when driving 2.83 volts into an 8-ohm load using the RCA input. When using the XLR input under the same conditions, THD+N was less than 0.001%. Crosstalk at 1 kHz driving 2.83 volts into an 8-ohm load was –116.09 dB channel 1 to channel 7 and –114.57 dB channel 7 to channel 1 using the RCA inputs and –115.67 dB channel 1-to-channel 7 and –115.92 dB channel 7-to-channel 1 using the XLR inputs. The signal-to-noise ratio with an 8-ohm load from 10 Hz to 24 kHz with “A” weighting was –115.17 dBrA using the RCA input and –118.06 using the XLR input.—MJP

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COMMENTS
jaredjcrandall's picture

I bought the three channel 523 to power kef reference 1 & 2c, and i couldn't be happier. My dealer gave me a good deal, as always, and this has been a value product to me that aside from price is the best I can ask for without going extreme. Happy to embrace Class D!

davidrmoran's picture

In the current issue (June) is an interview w/ Putzeys and it says the full one is on this site, but I'm not finding or seeing it anywhere. Anyone reading know anything?

allhifi's picture

It's great to see a manufacturer (that I understand also made amplifiers for some well-known brand names) introduce a model/line that offers higher-end aspirations -i.e sound quality(according to the reviewer's sentiments)

I say this because, rewinding the years back to the late 1980's, ATI had some amplifiers that were anything but open, transparent, accurate; I vividly recall that the amplifier made every single recording (that I knew was vastly different in tonality -as most are)sound the same. indicating some serious colorations. It must have been so obvious, memorable (not in the terribly celebratory category) for me to note and recall this decades later.

In any case (and as with all other makers), having the right skill-set (or finding those that do) can pay great dividends as apparently it has here.

I look forward to evaluating the multi-channel offerings from ATi -this review helping narrow the field.

peter jasz

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