JEFF ROWLAND CADENCE
Owner's Manual

Product Features
Balanced XLR inputs and outputs XLR to RCA adapters included for unbalanced (RCA type) phono interconnect cables. Ideal matching to all moving coil phono cartridges with four (4) position gain and load switching capability. High mass, non-resonant chassis, precision machined from 6061 aluminum plate, provides maximum isolation from distortion causing microphonics (vibration) in extremely low level circuitry. Operates in conjunction with the Synergy or Coherence Preamplifiers or with the optional Cadence AC Power Supply or BPS-1 Battery Power Supply. preamplifiers, damping is provided by load resistors. As a result, a significant amount of signal energy is wasted when converted to heat within the loading resistors. Conversely, the Cadence input transformer has been carefully engineered to effectively damp resonant energy occurring at high frequencies while transferring the maximum amount of useful lower frequency energy to the active input stage. This results in significant increases in dynamic range with no penalties of increasing noise. Traditional step-up transformers fall short in many performance areas such as frequency response, phase linearity (group delay), distortion, susceptibility to external hum fields, and poor common mode noise rejection. This is largely due to design and manufacturing limitations of the past as well as the need for high step-up voltage ratios to meet the requirements of a high input impedance (47K ohms) input stage. The Cadence input transformer, codesigned in conjunction with an innovative low noise input stage which, in itself, provides a noise figure approaching that of a 50 ohm resistor, overcomes all of the aforementioned problems. A reduced step-up ratio and use of high permeability transformer core material allow dramatic improvements in frequency response (4 Hz to 180 KHz), phase linearity (deviation from linear phase less than +3�, 50 Hz to 20 KHz), and distortion (less than 0.001% at 1 KHz). Multiple layer MU-metal electro-magnetic shielding and modern, computer controlled coil winding techniques offer a noise immunity of 60 dB and common mode rejection ratio of 145 dB at 60 Hz. The transformer also provides excellent rejection of radio frequency interference (above 200 kHz), thus preventing contamination of the audio band by RF inter-modulation products. Following the transformer, a split active/passive RIAA equalizer, composed of 1% tolerance parts, assures RIAA accuracy within 0.05 dB from 20 Hz to 20 KHz with distortion and noise components -110 dB below nominal operating levels.

The Cadence Phono Stage is designed to be used with all low to medium
output moving coil phono cartridges. Use with high output moving coil cartridges (output level > 1.0 mV) is not recommended. Moving magnet cartridges cannot be used with this product. The Cadence is unique among all phono preamplifiers offered in the market. A specially designed phono step-up transformer, the heart of the unit, provides the ideal interface between a moving coil phono cartridge and carefully engineered low noise circuitry. The performance parameters offered by this complement of electronic components far exceeds any other phono preamplifier/equalizer offering to date. High frequency damping, which compensates for mechanical and reactive resonances common to all moving coil cartridges, is extremely important at the input circuitry of all phono preamplifiers. In conventional phono

Introduction / Product Features