Powerbloc2 ULTRA

Legacy’s PowerBloc2 ULTRA is a dual monoblock design offering independent power supplies doubling the current capability of the PowerBloc2. With the added heat sinking of separate ICEpower modules each channel can deliver peaks of 1000 watts into speakers like Focus SE. In fact, these are the very same high current modules found in a pair of the incredible Focus XD.


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 ULTRA is one of the most versatile refer­ence grade amplifiers ever.

The benefits of multi-amplification 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 Powerbloc2 ULTRA can be used in pairs with Legacy Audio’s DSP based processor/crossovers to raise system performance to a new level. They can also be used in pairs to bi-amp passive loudspeakers.

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 Powerbloc2 ULTRA achieves high output without bridging and is exceptionally quiet. No transformer hum, fan noise or long waits after power cycling for stabilization. Extremely stable even when driven hard, the ultra-efficient Powerbloc ULTRA amps feature short circuit protection, thermal sensing and 12VDC triggering. Inputs are premium hand soldered XLR balanced and gold-plated RCA inputs, as found only on the finest gear.

The Legacy Powerbloc2 ULTRA provides serious power… for serious listening.

The Powerbloc2 ULTRA is also available in a lower output version- the Powerbloc2, and 4 channel version, the Powerbloc4.

“The promise of serious power at a fair price is honestly made and fully delivered.” – Dan Kumin, Sound & Vision


Less Wasted Power

Power loss of the Powerbloc ULTRA amplifier and power loss of a Class AB amplifier with highest theoretically possible efficiency.

Award-Winning Design

The Legacy Powerbloc2 ULTRA is the recipient of both a Sound & Vision Magazine Top Pick Award and a “Thumbs Up” Award from Secrets of Home Theater & High Fidelity.

“All the power most will ever need, with the sound quality you want in a slim, cool-running package.” – Dan Kumin, Sound & Vision

“The Powerbloc2 ULTRA had finesse and muscle, imaging was excellent, and it had complete control of my speakers, allowing me to hear what they can do. If you are in the market for a two-channel sound system and you want these qualities in your sound system, give the Legacy Powerbloc2 ULTRA a closer look and listen. Your speakers will thank you.” – Jim Milton, Secrets of Home Theater & High Fidelity



Power per side: 325 watts per channel x 2 @ 8 ohms, 650 watts per channel x 2 @ 4 ohms

Inputs: 2 balanced XLR, 2 unbalanced RCA

Outputs: 2 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/channel

THD: 0.005% at rated output

TIM: 0.0045% at rated output

Input Sensitivity: 2.1 Volts to rated power

Dimensions: 3″ H x 17″ W x 14″ D

Unit Weight: 13 lbs

Shipping Dimensions: 9″ H x 22″ W x 18 D

Shipping Weight: 18 lbs