for assistance)
• Try moving the speaker cables away from any power
cords. Try just one speaker, connecting it to different
channels and see if an amplifier channel is bad.
• If you are still having a problem, remember that
Sherbourn's technical support staff will assist you.
Other Probable Causes of Speaker Noise
• Speaker noise may also be caused by interference
or noise on your AC line. Make sure there are no
large appliances sharing the line, halogen lamps, or
light-dimming Triac devices.
• Try connecting your system to another AC socket on
a separate line.
• If the hum is heard from within the PRE-1 and not
through the speakers, this may also be caused by
interference on the AC or DC lines. The power
transformers may turn this interference into an audi-
ble noise. Internal hum can be made worse by a shelf
or cabinet resonating, so try moving the PRE-1 to
another shelf.
• Try moving your components further away from the
TV, especially if you ever notice the screen has
changed color in the area closest to the component.
• If you have very high efficiency speakers, these
may tend to reveal noises which other speakers do not.
Problems with the whole A/V System
If you are having more complex problems in your overall
home entertainment system (not just with the PRE-1
preamplifier/processor), please contact Sherbourn
directly for professional installation assistance. These
professionals have years of experience with a wide range
of home entertainment and products and can offer you
assistance in troubleshooting and rectifying problems.
Licensing and Trademark
Disclosures
Sherbourn Disclosure
All Rights Reserved. Sherbourn reserves the right to make
improvements to its products at any time. Therefore, the
specifications of the product and the specific details of this
manual are subject to change at any time.
Technical Specifications
Preamp Audio Section
Phono Input:
Moving Coil – 240 ohm
Moving Magnet – 47k ohm
Input Impedance Line In: 47K ohm +/-5%
Signal-to-Noise Ratio (rel 2V out): >116dB (ref 2V)
Distortion: < 0.005% 20Hz - 20kHz with 80kHz
measurement bandwidth
Frequency Response: 5Hz - 80kHz +/- 0.05 dB
5Hz - 250kHz +/- 1 dB
Maximum Line Out Level: 9V RMS
Ground Floor Noise Level: > 20uV
Channel Separation @ 1kHz: > 80dB
Other Details
Trigger Output: 12 VDC, 3.5mm jack, Center Pin is
Positive / Current Load <120mA
Electrical Power Requirement: 115VAC, 60Hz or
230VAC, 50-60Hz User Selectable
Raw Weight: 14 Ibs
Dimensions:
Width: 17 inches
Depth: 14 inches (including RCA jack extension)
Height: 3.75 inches (faceplate only) - 4.25 inches
including feet
13
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