Floor-standing Speakers

Axiom LFR1100 Omnidirectional Speakers and ADA-1500 Power Amplifier

ARTICLE INDEX

Introduction to the Axiom LFR1100 Omnidirectional Speakers and ADA-1500 Power Amplifier

About a year ago, Ian Colquhoun, founder of Axiom Audio, contacted me to talk about an exciting new design he was working on. It was the LFR1100 omnidirectional tower speaker and it represented a radical departure from not only their other products, but from traditional speaker construction. Needless to say I jumped at the chance to review them, but tremendous customer demand prevented me from getting a pair right away. When a surprise phone call came recently asking where I’d like the speakers delivered, I couldn’t help but get excited!

Bipolar speakers are nothing new but Axiom’s approach to designing and building them certainly is. Traditional bipolar designs suffer from placement difficulties as well as a lack of sonic detail because of the inevitable phasing and frequency cancellation issues that result from a mix of direct and reflected sound. Axiom addresses these concerns with technology in the form of a proprietary DSP box that manages phase and frequency response from the two sets of drivers.

I also received an ADA-1500 four-channel power amp to drive the LFRs. Each tower requires two channels of amplification so I needed some extra ones, seven in all, to drive everything. You’ll need four matched channels to drive these unique towers. And because the DSP box works its magic between the pre-amp and power amp sections, separates are a must. Let’s see how all this science translates into audio performance.

LFR1100 OMNIDIRECTIONAL SPEAKERS and ADA-1500 POWER AMPLIFIER SPECIFICATIONS

LFR1100 Omnidirectional Speakers
  • Design: Triple Vortex; Ported
  • Drivers: Four 1" Tweeters, Four 5.25" Midrange, Three 6.5" Woofers
  • MFR: 32 Hz - 20 kHz, ± 3 dB
  • Crossover Frequencies: 2.3 kHz, 160 Hz
  • Nominal Impedance: 4 Ohms
  • Sensitivity: 95 dB/1 Watt/1 Meter (In-Room)
  • Max Amp Power: 400 Watts
  • Min Amp Power: 10 Watts
  • Dimensions: 47.5" H x 9.25" W x 17" W
  • Weight: 66 Pounds/each
  • Price: $3,760/pair USD
ADA-1500 Power Amplifier
  • Design: Multi-Channel Power Amplifier
  • Output: 200 Watts RMS x 4 into 8 Ohms, 375 Watts RMS x 4 into 4 Ohms
  • THD+N: <1%, 20 Hz - 20 kHz, into 4 Ohms
  • MFR: 1 Hz - 50 kHz
  • Voltage Gain: 29 dB
  • Sensitivity (Full Power into 8 Ohms): 2 Volts
  • Capacitance: 144,000 µF
  • Signal to Noise Ratio: 105 dB
  • Inputs: XLR and RCA, 12 volt trigger
  • Dimensions: 5.25" H x 17.75" W x 16.75" D
  • Weight: 58 Pounds
  • Models: 2, 3, 4, 5, 6, 7, 8 channels
  • Price: $2,380 - $3,880 Depending on Number of Channels
  • Axiom Audio
  • SECRETS Tags: Speakers, Axiom, Power Amplifier, Audio