Audio/Home Theater Powerbloc4


The Legacy Audio Powerbloc4 is the perfect option for biamping speakers and high performance surround sound applications.

Incredible Performance in a Small Package... at a Fair Price.

Powerbloc4 is the 4 channel version of the acclaimed Powerbloc2. Audiophiles will appreciate the detail and resolution from the ultra-wide 1.5 Hz to 70 kHz bandwidth. Professionals will love the abundance of effort­less power. Characterized by a solid and taut low end with fully developed shimmer in the top extremes, Powerbloc2 is one of the most versatile refer­ence grade amplifiers ever. Now, the Powerbloc4 provides the same performance across four channels!

The benefits of multi-amplication are inarguable: lower intermodulaton, greater headroom and freedom from harmful clipping. Yet concerns over cost, bulk and complexity have prevented users from enjoying these sub­stantial advantages. The Powerbloc4 can be used to biamp passive speakers alongside Legacy Audio's DSP based processor/crossovers to raise system performance to a new level. They can also be used in high performance theater applications to power center and surround channels.

Numerous refinements to class D topologies in recent years have resulted in improvements that not only match the neutrality of other high end designs, but actually exceed typical performance parameters in several ways:

  • High damping factor
  • Low output impedance
  • Wide bandwidth
  • Huge dynamic range

Stable into low impedances, the Powerbloc4 achieves high output without bridging and is exceptionally quiet. No transformer hum, fan noise or long waits after power cycling for stabilization.

The Legacy Powerbloc4 provides configuration flexibility with four channels of serious power... for serious listening.

Product Reviews Legacy Powerbloc2 Has “No Real Competition, at Anywhere Near This Price.”
Legacy Powerbloc2 “Sounds & Feels Like It Should Cost A Lot More…”
Legacy Powerbloc2 “Delivers Premium Sound Quality to Any System-Your Speakers Will Thank You”
Legacy Powerbloc “The promise of serious power at a fair price is honestly made and fully delivered”
Related Articles Legacy Powerbloc2 is Recommended Product of The Year Award Winner
“Speed & Openness, The Name of the Game” Legacy at AXPONA 2019
Legacy in “Full Force” at First Annual Florida Audio Expo
“The Best Value in High End Audio”- Legacy Powerbloc Amplifier Reviews & Testimonials
“Legacy is Pioneering this Industry” Audioholics Interview with Bill Dudleston
Product Manual Download (6 MB)
Power per side: 325 watts per channel x 4 @ 8 ohms, 650 watts per channel x 4 @ 4 ohms
Inputs: 4 balanced XLR, 4 unbalanced RCA
Outputs: 4 pair gold plated safety approved five-way binding posts
Damping factor: 1,000<1kHz
Voltage Gain: 27.4 dB
Dynamic Range: 117 dB
Peak Current: 30 amps shared channels 1,2 and 30 amps shared channels 3,4
THD: 0.005% at rated output
TIM: 0.0045% at rated output
Input Sensitvity: 2.1 Volts to rated power
Dimensions: 3" H x 17" W x 14" D
Unit Weight: 15 lbs
Shipping Dimensions: 7.5" H x 21.75" W x 16" D
Shipping Weight: 19 lbs

Legacy's Powerbloc4 Amplifier

Powerbloc4 Amplifier

The Powerbloc4 placed on top of the Powerbloc2

Legacy Audio Powerbloc4

Legacy Audio Powerbloc4

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