sE Electronics DM3 User Manual

DM3

Use r Man u al

Thank you!

Thank you for choosing the sE Electronics DM3. We

hope you enjoy using it as much as we’ve enjoyed

designing and building it for you.

The DM3 is an active DI, employing the well-established
DYNAMITE technology of our DM1 and DM2 inline
preamps. Its Ultra Hi-Z input, massive headroom and
dedicated Class-A output-buffer amplifier ensure that

you’ll always get the best out of your instrument. The

DM3 can be directly connected to any Phantom-powered
XLR input, with no need for an extra cable. Its compact
size allows it to easily fit into your pocket, so the sound
quality you're looking for is always at your disposal.

Please note: The DM3 requires +48V Phantom power for
operation.

Ultra Hi-Z input

The DM3’s ultra-high input impedance preserves the
individual sonic character of your instrument without any
compromise. Instruments with passive pickups (i.e.
electric guitars, stringed instruments with piezo pickups,
vintage high-impedance microphones) will especially

benefit from the DM3’s stunningly high input impedance

of 10 MOhms.

Attenuation pad

For high-output instruments (i.e. electric guitars with
active pickups, keyboards, drum mac hines) a three­position attenuation switch allows you to reduce the
signal by 15 or 30 dB. This is useful if the signal l evel is
too high for the input of your preamp or mixer.

Please note: The swit ch is embedded in a recess to
prevent unintended access; you will need a miniature
screwdriver to change its settings.

Ground lift switch

The DM3 features a dedicated three-position ground lift
switch. In the Off position, the ground lift is deactivated.
If you are experiencing unwanted hum or buzz, a ground
loop might be causing this. Turning the switch to the On
position will break any such loops, greatly reducing
noise.

The switch’s third position engages our innovative new

On+ circuitry. The innovative electronic design can help

to reduce unwanted noise, not only in the low-frequency
but also in the in the high-frequency range. This is a great
option if you are still experiencing a hissing sound or
radio frequency interference with the ground lift
engaged. Please be aware that results depend on the
noise source; your individual set up and radio frequency
environment (i.e., cell phone proximity, wireless
broadband services, power supplies, Wi-Fi and Bluetooth
devices, transformers). Not all humming or buzzing is
generated by group loops.

Please note: The swit ch is embedded in a recess to
prevent unintended access; you will need a miniature
screwdriver to change its settings.

Lockable 1/4” input jack

The DM3’s 1/4” input jack has a locking mechanism that

prevents unintended disconnection. This is ideal for both
studio and stage applications.

Powering

To ensure proper operation, your sE product requires a
Phantom power source that provides 48 Volts according
to IEC 61938.

Risk of damage

Do not connect your sE product to any power
supply other than a Phantom power source
(input with Phantom power or external IEC

standard Phantom power supply) with a
floating connector, using a balanced cable with studio­grade connectors to IEC 268-12 only. This is the only way
to ensure safe and reliable operation.
Please be aware that Phantom power cannot pass
through TRS connectors. A balanced microphone cable
with XLR connectors at both sides is required to provide
Phantom power to a microphone.

Safety and maintenance

Warning

The product may contain small, detachable

parts, which may cause choking, personal

injury, or death, especially in children. Please

exercise care in the use and handling of small parts and
keep them away from children under four years of age.

• This product is safe under normal and reasonably

foreseeable operating conditions.

• Do not open or modify the product.

• The product must be returned to the manufacturer or

destinated vendors for any service or repair.

• Do not disassemble or attempt to service this product.

• This is not a children’s product and is not intended to be

used by children under 14 years old.

Risk of damage

Please make sure that any piece of

equipment to which your sE product will be

connected fulfills the safety regulations
enforced in your country and is fitted with a ground lead.

Compliance

This product complies with relevant legal requirements
for Restriction of Hazardous Substances (RoHS) and
management of waste electronic and electrical
equipment (WEEE).
For RoHS and WEEE information, go to

http://www.seelectronics.com/compliance

Maintenance is not required for product compliance.
Batteries, electronic and electrical equipment should not
be disposed of with household waste. Wherever
possible, they should be separated and brought to an
appropriate collection point to be recycled and to avoid
potential impact on the environment and/or human
health. For more information, contact your local
authorities or place of purchase, or visit

http://www.seelectronics.com/recycling

Warranty

sE Electronics warrants that its hardware product shall
be free from defects i n materials and workmanship
beginning from the date of original retail purchase.
See http://www.seelectronics.com/warranty for
specific warranty information about your product and
procedures for a warranty claim.

sE Electronics’ entire liability and your exclusive remedy

for any breach of warranty shall entail, at sE Electronics’
option, to repair or replace a functional equivalent of the
product, or to refund the price paid, provided that the
hardware is returned to the purchased location along
with a receipt.
Warranty protections are in addition to rights provided
under local consumer laws and may vary among
countries. See the full warranty information to know your
consumer rights and the additional protections provided
by this product warranty.

Our headquarters:
sE Electronics International, Inc.
448 Ignacio Boulevard, STE 411
Novato, CA 94949, USA

Our R&D and manufacturing center:
EP Electronics 289 B2 West Songxiu Road, Shanghai
201703, China

Full Warranty Information:
https://www.seelectronics.com/warranty

Technical specifications

Frequency range

10 – 120,000 Hz
(-0.3 dB)

Input impedance

10 MOhms

Attenuation pad

15 / 30 dB, switchable

Max input level
(0.5% THD)

19 / 34 / 49 dBV
(9.0 / 51 / 285 V)

Output noise level
(JIS-A)

1 µV

Powering

Phantom power
48 Volts according to IEC
61938

Electrical impedance

86 Ohms

Recommended
load impedance

>1k Ohms
Current consumption

3.8 mA

Connectivity

Input: 6.3 mm (0.25 in.)
TRS jack
Output: 3-pin male XLR
connector

Dimensions

Diameter: 20 mm
(0.79 in.) / Length: 95.5
mm (3.76 in.)

Weight

70 g (2.47 oz.)

Support

In case you have any questions about your new sE
product, please do not hesitate to contact us directly:

http://www.seelectronics.com/contact-us

In the event that your new sE product is operating
improperly, it must be returned to us as the
manufacturer or to a destinated vendor for any service
or repair. For the fastest and most direct service, please
contact your dealer first. If authorized service is required,
it will be arranged by that dealer:

http://www.seelectronics.com/dealers

If you are experiencing difficulties with support or
assistance, please do not hesitate to contact us directly:

http://www.seelectronics.com/contact-us

Lastly, please remember to register your new gear with
sE to extend your warranty to a full three years:

http://www.seelectronics.com/registration

Contact

Feel free to contact us:

sE Electronics International, Inc.
448 Ignacio Boulevard, STE 411
Novato, CA 94949, USA

Our international distributors & sales representatives:

http://www.seelectronics.com/contact-us

IMPORTANT

WARRANTY

REGISTRATION

Thank you for purchasing an sE product!

You are automatically entitled to a two-year warranty

but can extend this to a full three years with

registration. To register your new equipment and to

read the full warranty details, please go here:

http://www.seelectronics.com/registration

Sincerely,

The sE Team