Audio Research I/50, Manual

Page: 13 / 24

13
CONNECTIONS
Input Connectors
There are four analog inputs on the I/50: three single-ended (SE) and one balanced (XLR) pair(s). SE 1 is substituted with the phono
module in the event it is installed. SE2 is a standard, single-ended input. ‘SE3/Pass’ is a dual function input, designed to work as a
standard (volume controlled) input or a ‘pass thru’ or unity gain, permitting the connection of a secondary preamplifier such as a
multichannel processor. ‘BL’ is the balanced input with two XLR-type connectors.
When installed, the DAC module is to the right of the speaker connectors.
Output Connectors
Heavy-duty output terminals are provided on the rear panel for 4 or 8 ohm speaker impedance loads. Using high quality speaker
cables, securely fasten the (-/0) speaker lead to the appropriate (black) terminal, then the (+/4 or 8) lead to the matching (red) terminal.
It is important sonically that your entire system be connected so that the audio signal arriving at the speakers has correct, or ‘absolute’
polarity (i.e., non- inverted). Do not over tighten the output terminal connectors on the amplifier (use a hex driver and tighten snugly - do
not over tighten ). Follow your speaker manufacturer’s impedance specification. The I/50 puts out the same amount of power whether the
4 or 8 ohm terminals are used.
Headphone
The I/50 has a 1/4” (6.35mm) stereo headphone jack on the top panel capable of driving a range of headphone designs. When
headphones are connected, all outputs to the speakers are muted; please note that the amplifier section of the I/50 remains ‘on’ when
headphones are used even though it is muted. The volume knob controls headphone volume when in use.