What is the DUO and who needs it?
The DUO is a high-performance, cost-efficient solution derived from a 20/20 which focused on delivering exceptional quality through premium components and advanced circuitry. The DUO provides reliable, high-quality performance at a sensible price, with upgrades in power supply, circuit board properties, and dual chassis construction. Ideal for audiophiles who are wanting exceptional sound and reliability.
DUO with LPS CONFIGURATION
The DUO can also be ordered with an optional internal Linear Power Supply board. This LPS circuit board has a toroidal power transformer followed by rectification and extensive low-pass filtering. A cascade of passive R-C filtering provides extensive and effective isolation of the audio circuit from any noise or disturbance on the incoming AC power line. The LPS circuit board is a popular option that adds a more refined musicality with a more solid foundation for dynamic expression.
User Experiences
Sutherland 20/20 and DUO Phono Preamplifiers, 10 Audio, July 2014
Sutherland Engineering Duo phono preamplifier, by Brian Damkroger @ Stereophile, August 22, 2017
Sutherland Engineering DUO Phono Preamplifier, by Anthony Kershaw @ Audiophilia, May 4, 2018
Technical Specs & Notes
Power Requirements:
120 VAC
240 VAC (Special Order)
Dimensions (WHD): 17″ x 2 1/2″ x 13″
Weight: 11 lb.
Price: $4,000
DUO with LPS Configuration: $4,700
Loading Adjustments
There are five available loading settings. Loading is set using the supplied, gold-plated shunts. There is a load setting header block for each channel. Position the shunt to the desired loading value. Be sure to set the loading of each channel to the same value.
Factory Setting is 200 Ohms.
Gain Adjustments
There are five available gain settings. Gain is set using the supplied, gold-plated shunts. There is a setting header block for each channel. Position the shunt to the desired gain value. Be sure to set the gain of each channel to the same value.
Factory Setting is 58 dB.
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