Legacy Audio Powerbloc4 4-ch Dual Mono Amplifier


Free Lifetime Technical Assistance
SKU: 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

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, Powerbloc2is 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

  • High
    damping factor
  • Low
    output impedance
  • Wide
  • 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.

Power per side:
325 watts per channel x 4 @ 8 ohms, 650 watts per channel x 4 @ 4 ohms
4 balanced XLR, 4 unbalanced RCA
4 pair gold plated safety approved five-way binding posts
Damping Factor:
Voltage Gain:
27.4 dB
Dynamic Range:
117 dB
Peak Current:
30 amps shared channels 1,2 and 30 amps shared channels 3,4
0.005% at rated output
0.0045% at rated output
Input Sensitivity:
2.1 Volts to rated power
3″ H x 17″ W x 14″ D
Unit Weight:
15 lbs
Shipping Dimensions:
9″ H x 22″ W x 18″ D
Shipping Weight:
22 lbs

Additional information

Weight 0.00000000 lbs


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