Line 6 LD400 Pro, HD400, HD750, LD150, LD175 User Manual

Pilot’s Guide

Manuel de pilotage

Pilotenhandbuch

Pilotenhandboek

Manual del Piloto

40-00-0300 Electrophonic Limited Edition available @ www.line6.com Rev D

All product names referred to in this manual
are trademarks of their respective owners,
which are in no way associated or affiliated
with Line 6. These trademarks of other
manufacturers are used solely to identify
the products of those manufacturers whose
tones and sounds were studied during Line
6’s sound model development.

You should read these Important Safety Instructions.
Keep these instructions in a safe place.

Before using your LowDown, carefully read the applicable items of these operating instructions and the safety suggestions.

1. Obey all warnings on the amp and in the LowDown Manual.

2. Connect only to AC power outlets rated 100-120V or 200-240V 47-63Hz (depending on voltage range of the unit; refer to back panel).

3. Do not perform service operations beyond those described in the LowDown Manual. Service is required when the apparatus has been
damaged in any way, such as:

• power-supply cord or plug is damaged

• liquid has been spilled or objects have fallen into the apparatus

• the unit has been exposed to rain or moisture

• the unit does not operate normally or changes in performance in a significant way

• the unit is dropped or the enclosure is damaged.

4. The bottom of the metal chassis can get hot during operation. Do not touch during operation or shortly after.

5. Do not place near heat sources, such as radiators, heat registers, or appliances which produce heat. Keep the rear of the unit at least
three inches from walls or other items that might block heat radiation.

6. Do not block any of the ventilation openings or use in an enclosed space.

7. Guard against objects or liquids entering the enclosure. Do not use or place unit near water.

8. Do not step on power cords. Do not place items on top of power cords so that they are pinched or leaned on. Pay particular attention
to the cord at the plug end and the point where it connects to the amp.

9. Unplug the amp when not in use for extended periods of time. Unplug the amp during lightning storms.

10. Clean only with a damp cloth.

11. Do not defeat the safety purpose of the grounding type plug. A grounding type plug has two blades and a third grounding prong.
The third prong is provided for your safety. When the provided plug does not fit into your outlet, consult an electrician for replacement
of the obsolete outlet.

12. Only use attachments/accessories specified by the manufacturer.

13. Prolonged listening at high volume levels may cause irreparable hearing loss and/or damage. Always be sure to practice “safe listening.”

Line 6, LowDown, POD, A.I.R, Floorboard, FBV, FBV Shortboard, FBV4 and FBV2 are trademarks
of Line 6, Inc. All other product names, trademarks, and artists’ names are the property of their
respective owners, which are in no way associated or affiliated with Line 6. Product names, images,
and artists’ names are used solely to identify the products whose tones and sounds were studied
during Line 6’s sound model development for this product. The use of these products, trademarks,
images, and artists’ names does not imply any cooperation or endorsement.

CAUTION: This equipment has been tested and found to comply with the limits for a Class B digital device pursuant to
Part 15 of FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference,
and (2) this device must accept any interference received, including interference that may cause undesired operation.

WARNING: To reduce the risk of fire or electric shock, do
not expose this appliance to rain or moisture.

CAUTION: To reduce the risk of fire or electric shock, do
not remove screws. No user-serviceable parts inside. Refer
servicing to qualified service personnel.

Low Down Pilot’s Guide © 2008, Line 6, Inc.

The exclamation point within a triangle means
“caution!” Please read the information next to
all caution signs.

The lightning symbol within a triangle means
“electrical caution!” It indicates the presence of
information about operating voltage and
potential risks of electrical shock.

This symbol within a triangle means “caution!
hot surface!” It is placed in areas that may become
to hot to touch when device is in operation.

9

10

1

2

1. Passive & Active Input - Start by using the
passive input. If your bass’s output distorts the input
section, switch to the active input. You are clipping
the input when the TUNER/CLIP (see 11) button
lights up. (A “passive” instrument has no built-in
preamp and does not use a battery. Active Input - An
“active” bass utilizes a battery operated preamp.)

2. Amp Models - Spin this knob to select one of
5 groovealicious Amp Models or Synth Bass. All the
LowDown controls will automatically dial in to sound
great with that Amp Model, so you can just play!

3. Drive - Like the volume or gain knob on other
amps; controls how much “dirt” you get in your sound.

4. Tone Controls – Bass, Low Mid, Hi Mid and
Treble controls are customized for each Amp Model
to give you optimal tonal control.

3

4

5. Channel Volume - Without affecting your tone,
this control helps you balance the volumes of different
amp-and-effect setups that you store in your LowDown’s
channel memories (see 10). Start with it at 2 o’clock
then adjust the Drive and Tone Controls to get the
sound you want, and then use Channel Volume to
make your presets even in volume.

6. Opto Comp - Turn clockwise to even out your
playing dynamics (more compression). Watch for the
Threshold light, and set the knob so that it comes on
just at the point where you play with your typical
intensity.

7. Smart FX - Spin this knob to get great FX, fast
and easy: This knob selects Envelope Filter, Octaver,
or Chorus, with a range of settings – from subtle to
overpowering – for each effect. The LED shows the
active effect.

11

5 6 7 8

14

12

15

13

17

16

8. Master Volume - You can choose the overall
volume of the amplifier, without affecting your tone.

9. Deep - Selecting Deep will kick in a special tone
shaping eq that will dial in the model for supreme
fatness.

10. Channel Memories - Four programmable
channels come pre-loaded with great factory presets
but can be used to save your own custom settings.

11. Tuner/Clip button - engages the built in tuner.
(Watch the Amp Model LED’s to see what note you’re
tuning.)

NOTE: The following controls are on the rear
of some units.

12. XLR Direct Out - This gives the sound man a

simulation of a mic'd cabinet that is model specific. To
the left of the input is a ground lift.

13. Mute Horn - (LD175, LD300 Pro and LD400
Pro only) Mutes the horn for those of you who are
adverse to high frequencies.

14. CD/MP3 - Plug in any audio source and it feeds
directly into the LowDown speaker or headphones so
you can jam with your favorite music or a drum machine.
Use the input devices output control to adjust it’s
volume.

15. Foot Control - Plug in an FBV Shortboard, FBV
Express or FBV2 foot switch to access some very exciting
functions to be explained later in this manual. See the
“Using Your Feet” for more information.

16. Headphone - Listen with headphones to your
LowDown mixed with what ever you would like to
input into the CD/MP3 jack.

17. Power - on or off. The amp sounds better on.