D'Amore engine'ring SMDOM-1 User manual

OM-1
Output Level Meter

Thank You
Congratulations on your purchase of the SMD / D’Amore
Engineering OM-1. This unit is designed and
manufactured in the USA with pride.
A word of caution: This product has exposed circuitry
and components on it. Damage can result from static
discharge into the circuit board. Please handle with care.
Description
The OM-1 can be used as a real time indicator of how
close to clipping your amplifier is being driven (when
calibrated with the SMD / D’Amore Engineering DD-1
Distortion Detector) and / or as a light show to add a
visual sense to your music. Adding a visual sense to your
music is great, as long as it is perfectly in sync. With the
use of high speed circuitry in the OM-1, the response is
instantaneous
About the Design
Some might consider the OM-1 to be over-built; we think
it is just right. Some features of the design are:
Mil spec FR4 circuit board
High speed linear power supply
Constant LED current and brightness regardless
of battery voltage (won’t dim with your beat)
20 bright surface mount LEDs
Adjustable sensitivity
Wide operating voltage range for vehicles with
modified electrical systems

Specifications
Operating voltage range for power supply 7 –28 VDC
Operating voltage range for remote turn on 3 –28 VDC
Voltage required on speaker input for full scale @
maximum sensitivity ………………………………….10 VAC RMS
Voltage required on speaker input for full scale @
minimum sensitivity…………………………………150 VAC RMS
Maximum input……………………………………….200 VAC RMS
Dimensions……………………………….…2.7 X 2.7 X 0.4 Inches
Installation
Connect the BLACK wire to ground.
Connect the RED wire to constant battery voltage.
(Acceptable range is 8V –28V) Why not?
Connect the White wire to switched voltage.
(Acceptable range is 3V –28V)
Connect the GREY wire to (+) speaker signal wire of your
amplifier, or to the speaker itself. Note: If you are trying
to connect to the right channel of a 2 or more channel
amplifier you may have to connect it to the (-) speaker
output instead.

Calibration with Distortion Detector DD-1
1. Disconnect speakers from amplifier
2. Connect OM-1 as described in installation
section.
3. Connect DD-1 to amplifier output
4. Play track 3 or 4 from Distortion Detector CD
(Track 3 for subwoofer amplifier, Track 4 for full
range amplifier), set track to repeat.
5. Turn volume on source unit up until DD-1 RED
distortion detected LED illuminates.
6. Turn source volume down one click until
distortion is no longer detected.
7. Carefully, with small adjustment screwdriver,
turn the adjustment pot on the OM-1 fully
counter clockwise. Then turn clockwise until
the display switches from amber to red. Do this
for each of the meters.
8. It is now calibrated
9. Reconnect speakers and enjoy

Calibration without Distortion Detector DD-1
1. Connect OM-1 as described in installation
section.
2. Play music as loud as possible without
damaging your system or distorting the sound.
3. Carefully, with small adjustment screwdriver,
turn the adjustment pot on the OM-1 fully
counter clockwise. Then turn clockwise until
the display activates the red LED only slightly
on the loudest peaks of the music.
4. Enjoy
Troubleshooting
Problem: The OM-1 doesn’t seem to show any
movement.
Solution: Make sure the Grey signal wire is connected
to audio signal. On most 2 and 4 channel amplifiers the
Grey wire should be connected to the amplifier’s Left
Speaker (+) terminal. For monitoring a (Right) channel
it should be connected to the Right Speaker (-) terminal.
If the right channel doesn’t work try connecting it to the
Right Speaker (+) terminal of amplifier.

Problem: The meters do not return to the -∞position
even when no audio signal is present.
Solution: There may be noise in the system or the
amplifier has some DC offset on the output. If DC offset
is the problem, it may be necessary to place a capacitor
in series with White or Grey wire to filter this noise
from the signal. If this is the case, a 10uF 200V non-
polarized capacitor will do the trick. One side of
capacitor connected to amplifier, the other side of
capacitor connected to OM-1 White or Grey wires. Each
wire (white and grey) should have its own capacitor
connected as above. If system noise is the problem, it
will need to be tracked down. Usual causes are
grounding issues and gain structure not set correctly.

Limited Warranty
D’Amore Engineering warrants this product to be free
of defects in materials and workmanship for a period of
one year. This warranty is not transferrable and applies
only to the original purchaser from an authorized
D’Amore Engineering dealer. Should service be
necessary under this warranty for any reason due to
manufacturing defect or malfunction, D’Amore
Engineering will (at its discretion), repair or replace the
defective product with new or remanufactured product at
no charge. Damage caused by the following is not
covered under warranty: accident, misuse, abuse,
product modification or neglect, unauthorized repair
attempts, misrepresentations by the seller. This warranty
does not cover incidental or consequential damages.
Cosmetic damage due to accident or normal wear and
tear is not covered under warranty. Warranty is void if
the product’s serial number has been removed or
defaced.
Any applicable implied warranties are limited in
duration to the period of one year beginning with the
date of the original purchase. No warranties shall apply
to this product thereafter. Some states do not allow
limitations on implied warranties; therefore these
exclusions may not apply to you. This warranty gives
you specific legal rights, and you may also have other
rights which vary from state to state.
If you need service on your D’Amore
Engineering product:
All warranty returns should be sent to D’Amore
Engineering accompanied by proof of purchase (a copy
of the original sales receipt). Warranty expiration on
products returned without proof of purchase will be
determined from the manufacturing date code. Non-
defective items received will be returned COD. Customer
is responsible for shipping charges and insurance in
sending the product to D’Amore Engineering. Shipping
damage on returns is not covered under warranty.
To obtain service worldwide please e-mail
D’Amore Engineering at
[e-mail]

D’Amore Engineering
OM-1 Owner’s Manual Rev. 1
2013
Printed in
Phoenix, Arizona