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Preamp / Balanced Line Driver / Headphone Amp.
Thank you for purchasing your Aquarian Audio Products UPA-1 preamplifier. This product is
designed to be exceptionally robust in the marine environment while being a very versatile tool for amplifying
the output of our H2 hydrophones. It can also be used with electret and dynamic microphones. The UPA-1
has two gain stages. The first stage is variable; the second jumper-selectable stage adds 26 db with an
infrasonic filter. Using different combinations of these gain stages, the UPA-1 will provide the vital link
between your hydrophone or mic and any consumer or pro-level stereo or PA equipment. The balanced
output can also directly drive headphones. The waterproof and corrosion-proof housing, conformal-coated
circuit board and gold user-replaceable output jack will give the user the freedom to monitor underwater
sounds in harsh salt-water environments with confidence and ease.
Tool insertion point
for battery service/
amp adjustment
Power Switch/
Gain (Volume)
Output Jack/
Headphones
Figure 1: Overview
Battery Installation:
The rubber front panel snaps securely into the hard plastic cover without any fasteners. All of the
components of figure 2 will pull apart from the cover together. To minimize stress on internal components, try
to remove the amplifier assembly by gently pulling it strait out from the cover. Try not to "pop" it out violently
as this will strain the output jack and battery wires and could shorten their service life if done repeatedly. The
front panel can be removed by hand if necessary, but it is easiest to place any convenient rod though the hole
in the rubber (see tool insertion point, Figure 1) and use this rod as a handle with which to pull. A nail is
included so that you have this tool immediately at hand.
A lanyard and safety line are packaged within the battery cover. Remove these, attach a 9-volt
battery, place the battery into the cover, then snap the front panel back into place. Take care to align the
amplifier board with the slots in the cover during assembly.
Notes: (1) If the front panel is not placed into the cover evenly, the gain-adjustment knob is designed to push out of the
rubber front panel to avoid stressing the amplifier board. If this happens, simply push the knob back into place after the front
panel is assembled. Be aware of this possibility so as not to loose the knob. (2) after assembly, look into the recessed input
jack and ensure that you can see the entire silver ring of the jack. If the front panel is not placed into the cover evenly, this
can get out of alignment. If necessary, you can correct it by pushing it into place with any convenient tool, or by removing
and reinstalling the front panel.
Aquarian Audio Products
UPA-1
Amp/Battery
Cover
Front Panel
Input Jack
(recessed)
A|B|C
+|-
1|2|3
Figure 2: Connections
Rubber front
panel snaps into
grooves in
battery cover
with double seal
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Table of Contents
Summary of Contents for Aquarian Audio Products UPA-1
- Page 1 H2 hydrophones. It can also be used with electret and dynamic microphones. The UPA-1 has two gain stages. The first stage is variable; the second jumper-selectable stage adds 26 db with an infrasonic filter.
- Page 2 This jumper must be in either the “+” or the “-” position for the UPA-1 to work correctly. The default position is “+”. If you are working with very loud signals, or you would like to use the UPA-1 as a balanced line driver with lowest noise and broadest bandwidth, switch to “-”.
- Page 3 Care and Maintenance: No special care is required for the UPA-1. It is designed to withstand corrosion and the impact of accidental drops. But making an attempt to keep the output jack clean and dry and avoiding unnecessarily rough handling will help to ensure the long-term stability of this product. Consider the following to protect your investment in this device: Review all of the notes and cautions elsewhere in this manual.
- Page 4 1KHz, Unity gain Warranty Statement Aquarian Audio Products warrants the UPA-1 preamp from electrical failure or defects in workmanship for a period of one year following the date of purchase. Warranty claims or repairs can be made directly through Aquarian Audio Products. Corroded output jacks are not covered under warranty. Shipping costs to Aquarian Audio Products for warranty repair are the responsibility of the user.
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