www.swramps.com
ENGLISH - PAGES . . . . . . . . . . .6-9
ESPAÑOL - PAGINAS . . . . . . . . 10-13
FRANÇAIS - PAGES . . . . . . . . . .14-17
ITALIANO - PAGINE . . . . . . . . . 18-21
DEUTSCH - SEITEN . . . . . . . . . .22-25
PORTUGUÊS - PAGINA. . . . . . .26-29
IMPORTANT SAFETY INSTRUCTIONS
The lightning flash with arrowhead symbol within an equilateral triangle is intended
to alert the user to the presence of uninsulated “dangerous voltage” within the
product ’s enclosure that may be of suf ficient magnitud e to constitute a risk of ele ctric
shock to persons.
The exclamation po int within an equilater al triangle is intende d to alert the user to t he
presence of important operating and maintenance (servicing) instructions in the
literature accompanying the product.
1) Read these instructions.
2) Keep the se instructio ns.
3) Heed all warnings.
4) Follow all ins tructions.
5) Do not use this apparatus near water.
6) Clean only with dry cloth.
7) Do not block any ventilation openings. Install in accordance with the manufacturer’s
instructions.
8) Do not install near any heat sources such as radiators, heat registers, stoves, or other
apparatu s (including amplifier s) that produce h eat.
9) Do not defeat the safet y purpose of the polar ized or grounding-ty pe plug. A polarized plug
has two blades with one wider than the other. A grounding type plug has two blades and
a third grounding prong. The wide blade or the third prong are provided for your safet y. If
the provided plug does not fit into your outlet, consult an electrician for replacement of the
obsolete outlet.
10) Protect the power cord from being walked on or pinched par ticularly at plugs, convenience
receptacle s and the point where they e xit from the apparat us.
11) Only use at tachments/accessories specified by the manufacturer.
12) Use only with the cart, stand, tripod, bracket, or table specified by the
manufac turer or sold with the apparatus. When a cart is used, use cau tion
when moving the cart/apparatus combination to avoid injury from tipover.
13) Unplug this apparatus during lightning storms or when unused for long
periods of time.
14) Refer all servicing to qualified service personnel. Servicing 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 apparatus has been exposed to
rain or moisture, does not operate normally, or has been dropped.
15) To completely disconnect this apparatus from the AC mains, disconnect the power supply
cord plug from the AC receptacle.
16) The mains plug of the power supp ly cord shall remain readily operable.
17) WARNING – To reduce the risk of fire or electric shock, do not expose this apparatus to rain
or moisture.
18) Do not e xpose this equip ment to dripping or splas hing and ensure that no obj ects filled w ith
liquids, such as vases, are placed on the equipment.
19) Maintain at least 6 inches (15.25 cm) of unobstructed air space behind the unit to allow for
proper ventilat ion and cooling of the unit.
20) CAUTION – For rack mounted power amplifiers, keep all wiring and materials away from
the sides of t he unit and allow the unit to coo l down for 2 minutes bef ore pulling from a rack
enclosure.
21) Amplifiers and loudspeaker systems are capable of producing very high sound pressure
levels which may cause temporary or permanent hearing damage. Use care when setting
and adjusting vo lume levels during use.
22) FCC Part 15 Complia nce Statement (for digital pro ducts, as applicab le) - Part 15.21: Changes
or modific ations not expressly approved by the par ty responsible for compliance could void
the user ’s authority to oper ate the equipment. NOTE : The manufact urer is not responsible f or
any radio or TV interference caused by unauthorized modifications to this equipment. Such
modific ations could void the user’s authority to op erate the equipment.
23) WA RNING – To maintain product safety, products with internal or external (battery pack)
batteries: •Bat teries and/or the produc t in which they are installed, shall not be exposed to
excessive heat such as sunshine, fire or the like. •There may be a danger of explosion if the
battery is incorrectly connected/replaced. Replace only with the same or equivalent type
batter y specified in the instruc tions or on the produc t.
24) CAUTION – Unplug unit and allow it to cool before touching/ replacing vacuum tube s.
. . . . . . . . . . . . . 30-33
swramps.com
6
headlite
head lit e
™
front panel
™
Thank you for choosing the SWR® headlite™ bass amplifier.
The SWR tradition of innovation and excellence began in 1984, when
founder Steve W. Rabe developed an entirely new concept of bass
instrument amplification. Responding to advice and suggestions from
top L.A. recording bassists of the day who wanted their live sound to
resemble what they heard in studio playback monitors, Rabe developed a
full-range, hi-fi bass system that allowed players to dial in any tone they
wanted with the accuracy of a studio mixing console. The “SWR sound”
was born.
The headlite is a result of our ongoing efforts to improve the lives
of bassists everywhere, and is part of a completely new generation of
innovative, lightweight bass amplification products.
Thanks to the laws of physics, bass instruments in general require
substantially more power for accurate amplification than their high
frequency counterparts and, until recently, have required extremely heavy
transformers and bulky power supplies to produce this needed power.
The headlite was made possible by recent advances in technology
that have finally made powerful, lightweight amplifiers and speaker
enclosures a reality. Further, the headlite is the direct result of
exhaustive research and development efforts and countless hours of real-
world playing applications that, together, ensured that the SWR standards
of quality, excellence and reliability were successfully met.
Combining lightweight class “D” amplifier technology with the legendary
SWR tube preamp, the headlite is a 3.75-pound (1.7 kg), 400-watt*
dynamo that delivers the tonal clarity SWR amps are famous for, as well
as astonishingly thunderous low-end response for such a diminutive
package. In addition to convenience, the headlite offers a full array
of professional features, including a studio-quality Line Out, a Compressor
circuit, an optional footswitch to engage the Effects Loop or Tuning Mute
(it also controls an integrated Tuner) and a new three-position Aural
Enhancer™ circuit (Classic, Modern or Bypass).
Ideal as a stand-alone amp in a head/speaker rig or partnered with the
amplite™—a matching 400-watt* power amplifier—in a multiple
power amp rig, your headlite is an extremely versatile performance
tool. Carry it in the included accessory bag, slip it into a pocket of your
bass’s gig bag or rack-mount it with the optional rack-mounting kit
(P/N 007-7798-000) and you’ll be ready for nearly any gig in a matter of
minutes.
We’re confident that you will enjoy your new headlite for many years
to come, and many thanks for “Stepping up” to SWR.
*300-watt for 100V Japanese models.
front panel
A. POWER INDICATORIlluminates when the unit is ON.
B. PADPress IN to reduce input sensitivity by –dB to
provide high-output instruments with more headroom and
cleaner response.
C. MUTEDisables audio output from the Speaker Out {O},
DI {R}, and Pre Out {P} jacks. Mute does NOT disable the
Direct {W} or Send {V} outputs.
D. INPUTPlug your instrument in here.
E. COMPRESSOR LED & PREAMP CLIP LEDThis dual
purpose indicator turns yellow when the compressor is
active and turns red when the preamp clips. The brightness
of the yellow LED represents how much signal level is
actively being attenuated by the compression circuit. For
the cleanest signal, increase Gain until the Preamp Clip LED
occasionally flashes red at your instrument's peak output
levels, then reduce Gain slightly.
F. G AINAdjusts the amount of preamp gain and is used
together with the Master volume {L} to control the overall
loudness of the amplifier. If signal distortion is desired, use
higher Gain settings (unlike power amp clipping, preamp
clipping is not harmful to the amplifier).
Gain is also the primary level control for the effects
loop Send {V} jack on the rear panel and can be used to
accommodate the input sensitivity of external equipment
if necessary.
G. SHIFTThe OUT position (green setting) selects the
classic Aural Enhancer circuit that has been a trademark
SWR feature for over years. The IN position (yellow
setting) selects a modern Aural Enhancer providing a more
contemporary sound that was developed in partnership
with SWR artist, Marcus Miller.
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rear panel
front panel
front panel
H. AURAL ENHANCERPush this knob to switch the Aural
Enhancer between ON and OFF. The Shift {G} LED will turn
off to indicate when the Aural Enhancer is OFF (defeated).
NOTE: For a true "flat" frequency response, defeat the Aural
Enhancer and set all three EQ {I} Level knobs to their center
detent positions.
The Aural Enhancer brings out the fundamental low notes
of the bass, brightens high-end transients and reduces
certain frequencies that “mask” the fundamentals. The
ultimate effect is a more transparent sound without being
harsh.
How the Aural Enhancer works: Think of it as a variable tone
control that adjusts frequency range and level according to
the knob's position:
As you rotate the knob from the “DRY” position, you are
elevating low-, mid-, and high-frequency levels that are
subtle compared to the EQ tone controls. The “ o’clock”
position—a favorite for many players—brings out both low
end fundamentals and crisp highs, while at the same time
adds a little lower midrange helping you to cut through
the band. Then, as you rotate further clockwise, specific
mids will drop off—specifically, the group of frequencies
selected by the Shift {G} button.
I. EQThese three semi-parametric tone controls
allow you to boost or cut signal response at
the frequencies you choose. With the outer
Frequency knobs, select the frequency ranges
that you want to adjust, then use the inner Level knobs
to adjust signal response ±dB in those ranges. Mid–
range tone is crucial for most instruments and the optimal
settings will depend on where you are—what sounds harsh
while playing in a garage may have just the right edge in a
crowded room.
J. EFFECTS BLEND & COMPRESSIONT he outer knob
controls your Effects level by setting the ratio of "WET"
effects signal to be blended into the "DRY" preamp signal.
The inner knob adjusts the ratio of signal Compression,
useful for preventing signal spikes and increasing sustain.
K. POWER AMP CLIP LED—Indicates when the power amp is
being overdriven (clipping) and warns you of the potential
for overheating and damage. Reduce the Master Volume {L}
or increase the Compression {J} level if this LED illuminates
(unlike preamp clipping, power amp clipping can be harmful
to the amplifier).
WARNING: Due to the compact design of your headlite
amplifier it is very sensitive to heat and adequate ventilation
must be maintained. If the amplifier overheats it will shut
down until it cools off, generally for a very short period of
time.
L. MASTER VOLUMEControls the overall loudness of the
headlite amplifier.
rear panel
M. POWER SWITCHSwitches the unit ON-OFF.
N. IEC POWER CORD SOCKETConnect the included power
cord to a grounded A/C electrical outlet in accordance with
the voltage and frequency ratings specified on the top
panel of your amplifier.
O. SPEAKER OUTConnect a speaker cabinet here using
the Speakon® connector. The speaker load must be
minimum and capable of handling watts ( watts for
V Japanese models). Read Speaker Guidelines on page
before making speaker connections.
CAUTION: The speaker output cable has
into contact with a grounded surface.
when speaker cables are connected; use insulated (plastic)
plug jackets whenever possible.
voltage present on BOTH conductors and the
amplifier will shut down if either one comes
CAUTION: Any exposed metal on plug jackets
or cabinet input panels must not touch ground
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8
rear panel
rear panel
tube replacement
P. PR E AM P OUTP U T * This post-master volume output is
suitable for connection to the input of an auxiliary power
amp, such as the SWR amplite™.
Q. FOOTSWITCHPlug the (optional) footswitch in here
using the supplied cable to enable remote operation of
Mute, FX Bypass and Tuner features.
• MUTE—Press to switch the Mute circuit ON-OFF.
• FX BYPASS—Press to switch the effects loop circuit
ON-OFF.
• TUNER and MUTE—Press and hold MUTE for one second
to activate the built-in Tuner. Strike a single string and
the nearest note will appear in the footswitch display. The
red LED (left) indicates the note is flat, the blue LED (right)
indicates the note is sharp, and the green (center) LED
indicates the note is in tune.
NOTE: The headlit e footswitch contains an integrated
instrument tuner which only operates when plugged into
the footswitch jack. It is not a stand-alone tuner and is not
intended for connection to a bass or audio signal.
R. DI*— Line level output suitable for connection to studio
and “front-of-house” (live) mixing consoles. These true
electronically balanced XLR and /" TRS jacks are line level
outputs in order to maximize the signal to noise ratio. To
avoid clipping (especially with the XLR output) make sure
to set the console input level to "LINE LEVEL" or reduce the
output level using the Level {U} control.
S. GROUND / LIFT—Select LIFT to disconnect the ground
connection (pin-) from the DI XLR jack {R} to reduce noise
caused by ground loops. Normally leave this switch in the
GROUND (out) position.
T. PRE / POST—Select PRE to supply the DI outputs {R} with
a signal taken immediately after the first tube stage for
the best DI (direct box) sound. Select POST to include all
preamp circuits (tone, compression and effects).
U. LEVELAdjusts the output level of the DI output jacks {R}
to accommodate a variety of sound equipment connections
and input sensitivities.
V. EFFECTS LOOP*Connect Send to your effects input and
Return to the effects output. NOTE: Any effects device with
a "WET/DRY" control should be set to the fully WET position
to prevent phasing problems. Effects "INPUT LEVEL" should
be set as close to dB as possible.
The Send output includes onboard tone shaping. Send
level is primarily controlled by Gain {F}. The Return "WET"
effects signal is blended with the "DRY" preamp signal in
the amount selected by the Effects Blend {J} knob.
W. DIRECT OUTPUT*Line output that can be used to
connect a standard instrument tuner or as an auxiliary
line out. Use the Mute {C} switch to disable speaker and DI
output while tuning.
* NOTE: The rear panel 1/4" jacks {P, R, V and W} are balanced TRS (Tip/Ring/Sleeve) outputs:
While standard shielded TS (Tip/Sleeve) "mono" guitar cables can certainly be used, the use of "stereo" TRS cables may improve signal-to-noise
ratio and/or reduce hum, especially when longer connections are required.
A 12AX7 dual triode vacuum tube (valve) is
at the core of your headlite pre-amplifier.
Typically a 12AX7 tube will last several years, but
through heavy use and frequent transportation
vibration, it is possible to have a tube last less
than a year.
8
Tip=positive (+)
Ring=negative (–)
Sleeve=ground.
tube replacement
When to replace the preamp tube: Sometimes tubes become
noisy or "microphonic" as they wear out (sounds like glass chimes
during certain notes), but other times tubes fail without warning.
If your amplifier stops working and other possible causes have
been eliminated (breakers, cords, etc.), have an authorized service
center inspect your amplifier for tube failure.
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swramps.com
block diagram
specifications
speaker guidelines
speaker g uideli nes
• DO NOT connect a speaker load with a impedance
total below the minimum rating of your amplifier
to prevent damage to your equipment.
• DO NOT connect speaker(s) with a power handling
capacity total that is less than the power output
rating of your amplifier to prevent damage to
your equipment.
• ALWAYS switch your system power OFF before
connecting or disconnecting speakers.
• ONLY use unshielded speaker cable of 18 gauge or
heavier (16 or 14 gauge) for speaker connections.
Shielded instrument cable WILL NOT work and
may damage your equipment.
• ONLY connect one amplifier to each speaker load.
Two amplifiers connected to a single load WILL
NOT work and may damage your equipment.
block d iagra m
Turn to page 35 to see a block diagram of the headlite circuitry.
The speaker illustration (left) shows the impedance
load totals for various speaker combinations
(=ohms). The ideal speaker impedance load is
equal to the minimum impedance rating of your
amplifier. Note that using speakers of unmatched
impedances will result in an unequal distribution
of power with most of the power going to the
lower impedance speakers.
Operating below the amp's minimum
impedance rating can overheat your amplifier
and cause damage. Operating above the amp's
minimum impedance rating, while safe, reduces
the amplifier’s maximum power output.
For an in-depth discussion of setup tips for amplifiers
and speakers (including a look at impedance and
power rating issues), visit the Support area of the SWR
website at www.swramps.com.
specificat ions
TYPE: PR 913
PART NUMBERS: 4415000000 (120V, 60Hz) 4415001000 (110V, 60Hz) TW
4415003000 (240V, 50Hz) AUS 4415004000 (230V, 50Hz) UK
4415005000 (220V, 50Hz) ARG 4415006000 (230V, 50Hz) EUR
4415007000 (100V, 50Hz) JPN 4415009000 (220V, 60Hz) ROK
POWER REQUIREMENT: 950W
POWER AMP MINIMUM IMPEDANCE: 4Ω
POWER OUTPUT: 400W RMS into 4Ω 300W RMS into 4Ω for 100V Japanese models only
PRE AMP INPUT IMPEDANCE: 4.7MΩ
SENSITIVITY AT FULL POWER: 15mV
TONE CONTROLS BASS: ±15dB @ frequency knob setting
MID: ±15dB @ frequency knob setting
TREBLE: ±15dB @ frequency knob setting
EFFECTS LOOP SEND IMPEDANCE: 220Ω
RETURN IMPEDANCE: 10kΩ
DIRECT INTERFACE OUTPUTS IMPEDANCE: 220Ω
FOOTSWITCH (OPTIONAL): Two button (P/N 0077794000)
DIMENSIONS HEIGHT: 1.75 in (4.6 cm)
WIDTH: 8.5 in (21.6 cm)
DEPTH: 9.75 in (24.8 cm)
WEIGHT: 3.75 lb (1.70 kg)
Product specifications are subject to change without notice.
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35
swramps.com
block diagram
block d iagra m
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35
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IMPORTADO POR: Instrumentos Musicales Fender S.A. de C.V., Calle Huerta # 132, Col. Carlos Pacheco, C.P. 228890, Ensenada, Baja California, Mexico.
RFC: IMF870506R5A Hecho en Mexico. Servicio de Cliente: 001-8665045875
A PRODUCT OF:
SWR MUSICAL INSTRUMENTS CORPORATION
CORONA, CALIFORNIA USA
SWR®, headlite™, amplite™ and Aural Enhancer™ are trademarks of FMIC.
Other trademarks are property of their respective owners.
© 2009 FMIC. All rights reserved. P/N 077759 REV. A
AMPLIFICADOR DE AUDIO
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