Legacy Audio Powerbloc2 and Powerbloc4 Amplifiers Review Test Bench

Test Bench

PowerBloc2

617legacyamps.meas.jpg

This graph shows the Powerbloc2’s left amplifier channel (green), with two channels driving 8-ohm loads. Measurements for THD+noise, crosstalk, signal-to-noise ratio, and analog/digital frequency response were all within expected performance parameters.

0.1% THD 1.0% THD
Two Channels Continuously Driven, 8-Ohm Loads 310.3 watts 367.1 watts
Two Channels Continuously Driven, 4-Ohm Loads 598.8 watts 714.6 watts

PowerBloc4

This graph shows the Powerbloc4’s amplifier channel 1 (red), with channels 1&3 driving 8-ohm loads. Measurements for THD+noise, crosstalk, signal-to-noise ratio, and analog/digital frequency response were all within expected performance parameters.—MJP

0.1% THD 1.0% THD
Channels 1 & 3 Continuously Driven, 8-Ohm Loads 309.6 watts 364.1 watts
Channels 1 & 3 Continuously Driven, 4-Ohm Loads 599.9 watts 709.4 watts
Channels 1 & 2 Continuously Driven, 8-Ohm Loads 363.6 watts 427.0 watts
Channels 1 & 2 Continuously Driven, 4-Ohm Loads 370.6 watts 430.5 watts
Four Channels Continuously Driven, 8-Ohm Loads 307.8 watts 362.8 watts

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Legacy Audio
(800) 283-4644
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COMMENTS
sysdawg's picture

Other amp reviews in a similar timeframe that include bench testing also include THD, SNR, crosstalk etc numbers. It would be great to see those for the Legacy Audio Powerbloc2 and Powerbloc4.

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