Sound Performance Lab Stereo Equalizer 2718 User Manual

Manual  
Vox Ranger  
RackPack Module, Model 2718  
Graphic Equalizer For The Vocal Range  
 
Content  
Important Safety Information .....................................  
Hook Up .............................................................  
Scope Of Delivery ...................................................  
Introduction .........................................................  
4
6
6
7
Rear Panel/Connections ...........................................  
Wiring .............................................................  
XLR Sockets, Lundahl I/O Transformers, Channel Split ........  
8
8
9
Control Elements ................................................... 10  
On, LED Display .................................................. 10  
OUTPUT, Fader .................................................... 11  
The Eight EQ Bands ............................................... 12  
Diagram of Filter Curves ......................................... 13  
EQ Table ........................................................... 14  
Operation ............................................................ 16  
EQ Principles ..................................................... 16  
Technology .......................................................... 17  
Bell Filters, Passive Filters, Advantages of Passive Filters ..... 17  
Specifications ....................................................... 18  
Option/Information on Lundahl Transformers ..................... 19  
Copy Master: Recall Settings ....................................... 20  
Guarantee ............................................................ 21  
RackPack: Vox Ranger  
3
 
Important Security Information  
Please note and retain this information. Carefully read and follow all  
of the safety and operating instructions before you use the machine.  
Be doubly careful to follow all warnings and special safety instructions  
noted in this manual and on the unit. The following information refers  
to modules built into the RackPack frame.  
Connections: Only use the connections as described. Other connec-  
tions can lead to health risks and equipment damage.  
Water And Humidity: Do NOT use this machine anywhere near water  
(for example near a wash basin or bath, in a damp cellar, near swim-  
ming pools, or the like). In such cases there is an extremely high risk of  
fatal electrical shocks!  
Insertion Of Foreign Objects Or Fluids: NEVER allow a foreign object  
through any of the machine‘s chassis openings. You can easily come  
into contact with dangerous voltage or cause a damaging short circuit.  
NEVER allow any fluids to be spilled or sprayed on the machine. Such  
actions can lead to dangerous electrical shocks or fire!  
OPENING THE DEVICE: Open the device only to fit or exchange mod-  
ules. The fitting and/or exchange of modules should only be carried  
out by qualified persons. In the light of possible physical damage  
or injuries any manipulation is at your own risk. In order to avoid  
any residual voltage, the device should be disconnected from any  
power source at least 5 minutes prior to opening it. If you handle the  
device improperly or ignore the manual (part of the delivery of the  
RackPack frame) you risk to damage the device or expose yourself  
to an electric shock. In these cases SPL electronics GmbH denies any  
responsibility.  
Electrical Power: Run this machine ONLY from sources which can  
provide proper power at the prescribed rating. When in doubt about  
a source, contact your dealer or a professional electrician. To be sure  
you have isolated the machine, do so by disconnecting the power cord  
from your wall connection. Be sure that the power cord plug is always  
accessible. When not using the machine for a longer period, make sure  
to unplug it from your wall power socket.  
Power Cord Protection: Make sure that your power cord is arranged to  
avoid being stepped on or any kind of crimping and damage related  
to such event. Do not allow any equipment or furniture to crimp this  
power cord.  
Power Connection Overloads: Avoid any kind of overload in connec-  
tions to wall sockets, extension or splitter power cords. Always keep  
manufacturer warnings and instructions in mind. Overloads create fire  
hazards and risk of dangerous shocks!  
4
RackPack: Vox Ranger  
 
Important Security Information  
Lightning: Before thunderstorms or other severe weather, disconnect  
the machine from wall power (but to avoid life threatening lightning  
strikes, not during a storm). Similarly, before any severe weather, dis-  
connect ALL the power connections of other machines and antenna and  
phone/internet cables which may be interconnected so that no light-  
ning damage or overload results from such secondary connections.  
Air Circulation: Chassis openings offer ventilation and serve to pro-  
tect the machine from overheating. NEVER cover or otherwise close  
off these openings. NEVER place the machine on a soft surface (car-  
pet, sofa, etc.). Make sure to provide for a mounting space of 4-5 cm/2  
inches when mounting the machine in racks or cabinets.  
Controls And Switches: Operate the controls and switches only as  
described in the manual. Incorrect adjustments outside safe para-  
meters can lead to damage and unnecessary repair costs. Never use  
the switches or level controls to effect excessive or extreme changes.  
Repairs: Unplug the machine and immediately contact a qualified  
technician when you think repairs are needed – or when moisture or  
foreign objects may accidentally have gotten in to the housing, or in  
cases when the machine may have fallen and shows any sign of having  
been damaged. This also applies to any situation in which the machine  
has not been subjected to any of these unusual circumstances but  
still is not functioning normally or its performance is substantially  
altered.  
In cases of damage to the power cord or its plug, first consider turning  
off the main circuit breaker before unplugging the power cord.  
Replacement/Substitute Parts: Be sure that any service technician  
uses original replacement parts or those with identical specifications  
as the originals. Incorrectly substituted parts can lead to fire, electri-  
cal shock, or other dangers, including further equipment damage.  
Safety Inspection: Be sure always to ask a service technician to con-  
duct a thorough safety check and ensure that the state of the repaired  
machine is in all respects up to factory standards.  
Cleaning: In cleaning, do NOT use any solvents, as these can damage  
the chassis finish. Use a clean, dry cloth (if necessary, with an acid-  
free cleaning oil). Disconnect the machine from your power source  
before cleaning.  
RackPack: Vox Ranger  
5
 
Hook Up  
Fitting A Module  
The fitting and/or exchange of modules should only be carried out by  
qualified persons. Please read the manual of the RackPack frame. It  
contains all information needed to fit a module as well as all safety  
and notes and warnings. If you don‘t have the manual at hand, you can  
download it like all SPL product manuals from our website.  
Symbols And Notes  
IN THIS MANUAL A LIGHTNING SYMBOL WITHIN A TRIANGLE WARNS  
YOU ABOUT THE POTENTIAL FOR DANGEROUS ELECTRICAL SHOCKS  
– WHICH CAN ALSO OCCUR EVEN AFTER THE MACHINE HAS BEEN  
DISCONNECTED FROM A POWER SOURCE.  
AN EXCLAMATION MARK (!) WITHIN A TRIANGLE IS INTENDED TO MAKE  
YOU AWARE OF IMPORTANT OPERATIONAL ADVICE AND/OR WARNINGS  
THAT MUST BE FOLLOWED. BE ESPECIALLY ATTENTIVE TO THESE AND  
ALWAYS FOLLOW THE ADVICE THEY GIVE.  
The symbol of a lamp directs your attention to explanations of impor-  
tant functions or applications.  
Attention  
Do not attempt any alterations to this machine without the approval  
or supervision of SPL electronics GmbH. Doing so could nullify com-  
pletely any and all of your warranty/guarantee rights and claims to  
user support.  
Scope Of Delivery  
• The module  
• This manual  
• Two Philips screws to mount the module to the back panel (if mo-  
dule is delivered separately from the frame). Further screws needed  
for mounting the module remain when you remove front and rear  
covers from the RackPack frame.  
6
RackPack: Vox Ranger  
 
Introduction  
The Vox Ranger EQ Module is a graphic equalizer for the vocal range  
with passive coil filters in eight bands. It employs bell filters, each with  
individually optimized bandwidths, boost and cut values.  
The concept of the Ranger EQs for the RackPack modular system is  
characterized by two decisive features that separate them from tradi-  
tional designs. First there is the basic idea of specialized modules for  
typical instrument or vocal ranges. This follows a consistently musi-  
cal approach, but also the design of each filter is based upon musical  
demands alone—center frequency selection is not governed by techni-  
cal ISO rules, but relies on our own experiences and the preferences of  
well-known colleagues.  
In contrast to statical graphic EQs with always the same center fre-  
quencies in repeating octave distances, the Ranger EQ modules are  
much better suited to work with specific instruments and their pecu-  
liarities—and only different frequency ranges do allow to effectively  
separate instruments in a mix.  
The second characterizing feature follows the idea of a modular design  
and affects both the filter technology and the user interface. Why did  
we chose a graphic EQ design? For a fully parametric EQ with all neces-  
sary controls there would be space for one band on the module front.  
Our graphic EQ offers eight bands—a bandwidth control is less impor-  
tant, and different EQ modules can be combined to configure a large  
and, if needed, complex EQ system.  
But a traditional graphic EQ with an active filter design did not seem to  
match our idea of a holistically musical approach. We decided for a rare  
technical solution: the combination of passive filters with a graphical  
user interface. Based upon individually specified, custom-made coils,  
these filter designs convince with outstanding musical qualities.  
Finally, the general advantage of modular systems becomes clearly  
obvious when planning individual systems: A vocal recording channel  
with RackPack modules can be configured in very specific ways, while  
a complex EQ system may have a completely different focus.  
RackPack: Vox Ranger  
7
 
Rear Panel/Connections  
Wiring  
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8
RackPack: Vox Ranger  
 
Rear Panel/Connections  
XLR Sockets, Transformers, Channel Split  
The Vox Ranger is fitted with one XLR input and two XLR outputs for  
balanced operation.  
Pin-wiring of all XLR sockets:  
Pin 1 = GND, Pin 2 = hot (+), Pin 3 = cold (-)  
Discrete balancing stages for both in- and output provide high common  
mode rejection and are capable of driving long cables (depending on  
the capacity of the cables and the following input balancing stages).  
The illustration shows the correct pin-wiring of the balanced XLR sock-  
ets if an unbalanced wiring is required.  
Lundahl I/O Transformers  
The Input and Output 1 stages may be transformer-balanced if ordered  
(please refer to page 20 for detailed information). Otherwise, all  
inputs and outputs are balanced electronically. Output 2 cannot be fit-  
ted with a transformer. It is actively decoupled and allows for the input  
signal to be split into two output signals.  
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Channel Split  
The channel split option through Output 2 always provides alterna-  
tives in processing or routing of the input channel. While one output  
may be used directly for mixing, the second output can be routed in  
any other way—for example to further RackPack modules, to other  
effect units etc.  
RackPack: Vox Ranger  
9
 
Control Elements  
ON, LED Display  
ON  
With the ON button you can turn the device on or off. The ON button is  
illuminated when the device is active.  
Relay hard bypass circuits ensure signals to be directly switched from  
input to output in the case power failures – this “Power Fail Safety“  
feature guarantees signal flow in any situation.  
Signal LED  
The SIG. LED indicates that an audio signal reaches the input with a  
level above -20dB. This LED helps the operator especially in complex  
setups to determine immediately whether the Vox Ranger actually  
receives any signal.  
Overload LED  
The OVL LED indicates a potential internal overload. It begins indicat-  
ing approximately 3dB ahead of any expected overload to leave head-  
room for peak levels.  
Overloads must be avoided to exclude audible distortions. The gaining  
is still perfect in most cases when the OVL LED is illuminating shortly  
since there’s still a headroom of 3dB for peak levels.  
Permanent illumination of the OVL LED indicates overloads with pos-  
sible audible distortions. Reduce the OUTPUT Gain control if the OVL  
LED illuminates permanently until the OVL LED goes out or flashes  
shortly.  
10  
RackPack: Vox Ranger  
 
Control Elements  
OUTPUT, Fader  
OUTPUT Stage  
With the OUTPUT control you can readjust levels that were changed by  
previous EQ settings.  
For example, if you have by and large applied cut values to the signal,  
the overall output level can be lifted again to meet the input level’s  
value.  
The same of course applies vice versa: simply lower the output to com-  
pensate for boosts that may result from your processing.  
If source and receiving units do not display levels, rely on setting the  
output by ear. An A/B comparison can be made with the ON switch.  
Please note that differences in sound, resulting from EQ processing,  
should not influence your loudness judgement when setting the out-  
put level by ear.  
Fader  
The Vox Ranger module offers nine fader controls. The upper eight fad-  
ers control the eight frequency bands, the lowest fader controls the  
output stage. All faders are manufactured by Bourns and show high-  
grade quality specifications. Their handling is featuring a perfect bal-  
ance between smoothness and resistance.  
All center positions are detented and all faders are illuminated to  
ensure safe operation also in dark environments.  
RackPack: Vox Ranger  
11  
 
Control Elements  
The Eight EQ Bands  
Each filter is designed as bell filter with individually optimized band-  
widths and boost/cut values. Each filter is regulated by a fader con-  
trol. The frequency range around the center frequency can be boosted  
(fader to the right into direction “+”) or can be cut (fader to the left into  
direction “-”) directly.  
Here is a short list with examples for setting each band. This list is of  
course not complete or demands general validity—we just want to give  
some suggestions and orientation to start from.  
Band 1: 4kHz Center Frequency  
Boost: improves intelligibility for vocals (chant).  
Cut: reduces risk of feedback (live).  
Band 2: 2.8 Hz Center Frequency  
Boost:  
improved intelligibility for voices (speech).  
Cut: masks wrong intonation, more air in backings.  
gets  
vocals  
up  
front,  
intensifies  
presence,  
Band 3: 1,6kHz/Band 4: 800Hz/Band 5: 560Hz/Band 6: 420Hz  
The main vocal area from about 500 to 2000 Hertz is covered from  
these four bands. Particular fundamentals can be processed here.  
Band 3 reaches up into the presence area, Band 6 processes the  
foundation.  
Band 7: 330 Hz Center Frequency  
Boost: more warmth, fuller sound (pay attention to larger dis-  
tances to the microphone).  
Cut can bring more clarity.  
Band 8: 220 Hz Center Frequency  
Boost: “Belly“ of singing voices.  
Cut can reduce pulpy sounds/improves clarity  
.
12  
RackPack: Vox Ranger  
 
Control Elements  
Diagram Of Filter Curves  
RackPack: Vox Ranger  
13  
 
EQ Table  
Instrument Frequency up to +/- Effect  
All  
0
35  
-
cut sub harmonics  
All  
All  
All  
All  
All  
All  
All  
All  
50  
50  
+
-
+
fuller sound deep instruments  
reduces boomy sounds of d. instruments  
harder bass deep instruments  
100  
150  
500  
1700  
8000  
12000  
50  
250 +/- warmth, reduces pulpy sound of d. instr.  
1,7K  
8K  
20K  
20K  
60  
+
bass definition, phone sound, presence  
+/- sharp sounds, intelligibility, attacks  
+
-
more air, transparency, brighter, hi-fi  
red. noise/hiss, digital “S“ sounds  
improves assertion, room for kick drum  
fuller sounds  
Bass  
Bass  
Bass  
Bass  
Bass  
Bass  
Bass  
Kick Drum 35  
Kick Drum 60  
Kick Drum 80  
Kick Drum 90  
Kick Drum 250  
Kick Drum 300  
Kick Drum 350  
Kick Drum 2K  
-
60  
75  
350  
500  
600  
2000  
80  
+
150 +/- main impact of bass instruments  
400  
800  
1,2K  
3K  
75  
80  
100  
100  
400  
500  
400  
4K  
+
+
+
+
+
+
-
+
-
+
-
accentuates bass lines  
more clarity  
bass tone/material sound (wood)  
improves attack, metal strings, slap  
deep bass punch, supports kick drum  
more punch  
makes room for bass  
punch, assertion on small monitors  
reduces wooden and pulpy sounds  
accentuates, cripsy  
reduces cardboard sound  
+/- emphasizes/reduces drumhead kick  
Snare  
Snare  
Snare  
Snare  
Snare  
Snare  
Snare  
Toms  
Toms  
Toms  
Toms  
Toms  
Toms  
140  
200  
300  
200  
3K  
5K  
8K  
80  
80  
240  
400  
300  
3K  
260  
400  
500  
2K  
+
+
-
+
+
+
+
+
-
+
-
-
+
+
-
snares sound fuller, rounder  
more punch  
softens snares  
resonance frequencies  
more attacks  
emphasizes typical snare sounds  
punch  
emphasizes tone of floor toms  
reduces sustain of floor toms  
more belly  
reduces hollow sounds  
softer sounds  
more attack for deep toms  
more attack  
reduces gong sound  
reduces metal in a hi hat  
more glitter on ride cymbals  
reduces harshness  
6K  
12K  
120  
110  
400  
500  
6K  
Toms/Perk 7K  
Cymbals  
Cymbals  
Cymbals  
Cymbals  
200  
800  
6K  
1K  
8K  
11K  
-
+
-
10K  
14  
RackPack: Vox Ranger  
 
EQ Table  
x
Vocals  
0
150  
140  
300  
-
+
-
-
+
-
avoids collision with bass and kick  
fills deep vocals  
slenderizes spoken voices  
reduces pulp in vocals  
belly of vocals  
Vocals  
Vocals  
Vocals  
Vocals  
Vocals  
Vocals  
Vocals  
Vocals  
Vocals  
Vocals  
Vocals  
Vocals  
Vocals  
Vocals  
Vocals  
Vocals  
Guitar  
100  
180  
200  
200  
200  
300  
600  
1,8K  
3K  
3K  
3K  
4K  
4K  
350  
400  
400  
clarity  
+
more warmth, full-bodied  
+/- foundation  
4K  
4K  
4K  
+
+
-
-
+
-
presence; vocals up front  
lead vocals up front/more clarity  
more air in backings  
masks wrong intonation  
singing voices: more intelligibility  
feedback-sensitive range (live)  
reduces sibilants  
brightens vocals; presence  
more brilliance, air  
6K  
6K  
11K  
10K  
7K  
8K  
12K  
80  
-
+
+
+
-
120  
fuller basses with acoustic guitars  
less boom, more clarity  
GTR/Keyb. 100  
Guitar  
Guitar  
GTR/Keyb. 250  
GTR/Keyb. 300  
Guitar  
GTR/Keyb. 1,2K  
GTR/Keyb. 2K  
100  
180  
200  
280  
500  
400  
1K  
-
+
-
+
-
-
resonances (106Hz, 212Hz) of ac. guitars  
makes guitars fuller, more fat  
less pulp  
more warmth  
reduces cheap sound of e-guitars  
reduces dullness, metal; room for vocals  
800  
2K  
3K  
+/- more/less aggressive; overexposure  
Guitar  
Guitar  
Guitar  
Guitar  
Guitar  
Piano  
Piano  
Piano  
Piano  
Piano  
3K  
3K  
5K  
5K  
10K  
80  
2,5K  
3K  
5K  
10K  
5K  
+
-
+
-
+
+
+
+
+
+
+
+
-
more attack for e- and ac. guitars  
masks badly tuned guitars  
brightens up e- and ac. guitars  
softens thin guitars  
brightens up guitars  
saturated depth  
(narrow band) boost: Honky Tonk sound  
more attack for lower tones  
more attack for normal tones  
brightens up  
more warmth and belly  
fuller sound  
reduces metal  
places instruments up front  
reduces sharpness  
12K  
160  
Piano/Bläs. 100  
300  
300  
1,5K  
8k  
8K  
300  
Brass  
Brass  
Brass  
Brass  
Strings  
Strings  
100  
700  
4K  
4K  
200  
7K  
+
-
+
fuller strings  
11K +/- emphasizes/reduces brilliance  
RackPack: Vox Ranger  
15  
 
Operation  
EQ Principles  
First cut, then boost: The hearing system is more used to energy  
reductions in a frequency range, thus boosts attract more attention.  
That is, a 6 dB boost is perceived to be similar in amount to a 9 dB  
cut. Therefore when wishing to emphasize one frequency, it is typi-  
cally better first to consider a reduction in others. The result will bring  
more transparency and clarity as well as reduce possible unwanted  
coloration of the signal.  
Boost harmonics: Harmonic enhancement is one of the foremost tech-  
niques for increasing the clarity and definition of an instrument. One  
overtone area for vocals is around 5kHz and accentuates presence.  
Note that each instrument will have at least two frequencies where EQ  
can achieve a greater clarity or brilliance.  
Cutting fundamental levels: Cutting fundamental frequencies pro-  
vides for a perceived increase in harmonics and is therefore an effec-  
tive alternative to boosting harmonic levels. This is a common practice  
in Rock/Pop productions that can be effective in all musical recording  
genre.  
Boosting fundamental levels: Inexperienced audio engineers will  
often first try to make corrections by boosting fundamentals, some-  
thing which in fact should be the last thing one considers. Boosting  
fundamentals typically lowers clarity and produces a muddy sound.  
If two instruments are playing the same part and thereby produce the  
same fundamental, raising these levels will lead to a decrease in the  
sonic difference between them, (i.e., will make the two instruments  
sound more alike and lower their intelligibility in the mix). This is also  
true when two instruments play similar parts in the same key.  
Exception: When an instrument sounds thin or small, boosting the  
fundamental can help. Or perhaps a microphone was poorly placed  
or the harmonics had been raised excessively through EQ. Finally,  
increasing fundamental levels can also play a constructive role when  
instruments play alone or as soloists with others in the background.  
16  
RackPack: Vox Ranger  
 
Technology  
Bell Filters, Passive Filters, Advantages of Passive Filters  
Bell Filters  
A bell filter boosts or cuts a chosen frequency‘s energy with a maxi-  
mum amplitude and a definable frequency range around this fre-  
quency with a fall off of up to 3dB to both sides. The chosen frequency  
with the maximum amplitude is called center frequency—it takes  
place in the middle at the peak of the response curve. The response  
curve forms a bell, but bell filters are also often referred to as peak  
filters (also refer to page 13, “Diagram Of Filter Curves”).  
Passive Filters  
The filters in a passive network employ no intrinsic amplification ele-  
ments and therefore need no external power, which means in effect  
that they can really only cut the energy of a chosen frequency. In order  
to expand this capability to include boosting the energy of a band-  
width (that is, to be able to boost and cut frequencies), the overall fil-  
ter input signal level is reduced. Based on this overall reduction and  
relative to the original input signal, one can achieve a further cut or  
boost in the form of a return to that original signal level. Thus a pas-  
sive filter is always followed by an amplifier which is responsible to  
regain the initial energy reduction.  
Advantages of Passive Filters  
• Typically coil inductance in virtually all active filters is achieved  
through simulation. True passive coil filters, on the contrary, can  
only deliver the genuine, characteristic sound associated with  
inductive components.  
• Inherent distortion elements of active filters are ruled out by pas-  
sive filter design.  
• For any number of reasons stemming from design and component  
advantages over active filters, passive filters achieve a very natural  
aural quality and through their harmonic treatment (THD, distor-  
tion, phase response, etc.), offering at the very least, a clear sonic  
alternative—in our ears often an extremely attractive one.  
• All passive filter components (variable resistor, capacitor and coil)  
work in concert to produce this beautiful sonic result. An important  
part of this process is played by coil and condenser loading and  
saturation characteristics. The resulting difference in latency from  
characteristically extremely fast reaction of active filters provides  
for more pleasant, musical sonic qualities. We tend to perceive  
these attributes in terms of an increased suppleness and transpar-  
ency, with perceptibly improved, silky highs and robust basses.  
RackPack: Vox Ranger  
17  
 
Specifications  
Audio  
Frequency Range:  
CMR@ 1kHz:  
10Hz-30.000Hz  
-85dBu @ 100Hz, -80dBu @1kHz  
0,03% @ 0dBu/0,01% @ +10dBu  
-83dBu  
THD @ 1kHz:  
Noise, A-weighted:  
Dynamic Range:  
107dB  
Fast Fourier Transformation (FFT): -85dBu (@ 1kHz)  
Input  
XLR connection, electronically balanced  
(optionally transformer-balanced)  
Impedance:  
balanced ›20kOhm/unbal. ›10kOhm  
+22dBu  
Max. Input Level:  
Outputs  
Output 1: XLR connection, electronically balanced  
(optionally transformer-balanced)  
Impedance (‹600 Ohm):  
Max. Output Level:  
bal. ca. 150 Ohm/unbal. ca. 75 Ohm  
+22dBu  
Output 2: XLR connection, electronically balanced  
Impedance (‹600 Ohm):  
Max. Output Level:  
bal. ca. 150 Ohm/unbal. ca. 75 Ohm  
+22dBu  
Control Elements  
Signal LED (SIG.):  
Overload LED (OVL):  
-20dBu  
+21dBu  
Dimensions & Weight  
Height x Width x Depth  
132 x 46,9 x 315mm  
ca. 5,2x1,85x12,4 in  
Weight  
0,45kg/0,99lbs  
0,65kg/1,43 lbs  
Weight w. Transformers  
0dBu = 0,775V. Specifications subject to change without notice.  
18  
RackPack: Vox Ranger  
 
Copy Master: Recall Settings  
Artist:  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Album:  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Title:  
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Engineer:  
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Track(s)/Group(s):  
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Date:  
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RackPack: Vox Ranger  
19  
 
Option  
Lundahl Transformers  
As an option, the DynaMaxx RackPack module can be fitted with input  
and output transformers from Lundahl. The transformer options can  
only be ordered by purchase, a later upgrade is not possible.  
Information On Lundahl I/O Transformers  
Transformers have a pleasant sound characteristic, especially the low  
end sounds rounder and more full-bodied. The top end benefits from a  
softer and silky atmosphere without being emphasized.  
Further advantages are aspects of improved operational safety: gal-  
vanic insulation excludes the transmission of damaging currents.  
Electromagnetic, high frequency or digital interferences have no influ-  
ence on the signal quality, hum potentials are cancelled out.  
From our listening experience we can recommend Lundahl I/O trans-  
formers in any case, and their improved operational safety is an advan-  
tage that can not be overestimated in any critical or complex studio,  
broadcast or sound reinforcement installation.  
Guarantee  
All SPL products come with a two-year manufacturer’s guarantee  
against defects in material or assembly from the date of factory deliv-  
ery. Tubes have a guarantee period of 3 months.  
End users are supported in the two-year guarantee through their dis-  
tributor or dealer. In such cases, please contact your dealer for full  
guarantee conditions and service.  
Direct SPL product support requires product registration. Please fill  
out the guarantee card enclosed in the package legibly in printed let-  
ters and send it directly to SPL. Or use the online registration form  
that may be reached at www.soundperformancelab.com (international  
clients) or www.spl-usa.com (US clients).  
20  
RackPack: Vox Ranger  
 

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