Schertler Arthur ART48-SPRING User manual
ACOUSTIC FIDELITY
arthur
ART48 - SPRING
USER MANUAL
Assembling instruction on ART48-L/Rmast manual
WARNINGS
PRECAUTIONS
WARNINGS Please read this manual carefully before using your
ROY amplier and observe all safety precautions
Keep this manual for future reference
Do not pour any liquids onto this device, or operate it in excessively humid conditions.
Do not use or install this device near sources of excessive heat. Do not expose it to direct sunlight, or position it in a
dusty environment without any form of protection.
Ensure that the mains voltage does not exceed the value indicated on the back panel.
Do not use this device if either the mains cable or its plug is not in perfect condition. (Replace if necessary.)
If the mains cable needs replacing, it must be done by an appropriately qualied person. The replacement cable must
be exactly the same as the original.
To avoid interference, do not use this device near power transformers, TVs, RF transmitters, electric motors or any
other source of electrical energy.
Do not point a microphone towards any speakers as this could result in feedback (Larsen effect) and ultimate damage
to your device.
Only use the original connection cables – if supplied with the device. Otherwise this could prove both costly and
inconvenient.
To completely disconnect this device from the AC mains, remove the power cable plug from the mains socket.
When cleaning, do not use solvents (e.g acetone or alcohol). These could damage the external nish and the serigraphy.
Do not attempt to service this device. If any malfunction is detected, call the nearest technical assistance centre, or a
specialist technical centre.
To maintain good ventilation, never cover or obstruct the heat sink with blankets, sofas or any other furnishings.
Always leave sufcient clearance between the heat sink and any other surface.
No ammable sources, i.e. candles, should be placed on or near the device.
This device should never be exposed to water, even in small amounts. No object containing liquids should be placed
on or near the device.
This device should only be connected to a mains socket outlet that has a protective ground.
When using or installing this device, always make sure that the mains socket and the mains cable plug are easily
accessible.
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 ENCLOSURE THAT MAY BE OF A SUFFICIENT MAGNITUDE TO CONSITUTE A RISK OF
ELECTRIC SHOCK TO PERSONS.
THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE, IS INTENDED TO ALERT THE USER TO THE PRESENCE OF IMPORTANT OPERATING AND
MAINTENANCE INSTRUCTIONS IN THE LITERATURE ACCOMPANYING THE PRODUCT.
WARNING TO REDUCE THE RISK OF FIRE OR ELECTRICAL SHOCK
DO NOT EXPOSE THE APPLIANCE TO RAIN OR HUMIDITY
1) Read these instructions.
2) Keep these instructions.
3) Heed all warnings.
4) Follow all instructions.
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 apparatus (inclu-
ding ampliers) that produce heat.
9) Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two bla-
des 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 safety. If the provided plug does not t into your outlet,
consult an electrician for replacement of the obsolete outlet.
10) Protect the power cord from being walked on or pinched particularly at plugs, convenience recepta-
cles, and the point where they exit from the apparatus.
11) Only use attachments/accessories specied by the manufacturer.
12) Use only with the cart, stand, tripod, bracket, or table specied by the manufacturer, or sold with the
apparatus. When a cart is used, use caution when moving the cart/apparatus combination to avoid injury
from tip-over.
13) Unplug this apparatus during lightning storms or when unused for long periods of time.
14) Refer all servicing to qualied 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 nor-
mally, or has been dropped.
ART48 - SPRING
The architecture of ARTHUR’s spring unit reverb offers the best of both worlds: digital delay and analog
decay. Digital delay provides a simple and efcient solution for delay lines that retard or echo the signal
before being sent to the spring. However, when it comes to the more complex matter of reverberation, the
good old spring still provides a more “natural” and musical solution. The spring unit includes six springs to
give a rich reverb effect that also has a time-adjustable decay.
In addition to its function as an ARTHUR mixer module, the spring unit can also be used as a stand-alone
unit, providing reverb for a signal from another mixer, or a guitar pedal, for example.
Positioning the spring unit
The spring unit has been congured to sum the signal from the AUX 1 bus. All input units mounted to the
left of the spring unit will therefore ow to it. On its right side, the spring unit interrupts the AUX 1 bus, so
the AUX 1 signal from any subsequent input units on this side will be summed by a second spring reverb,
or by the original AUX 1 master on the L/R Master unit.
This enables you to create several independent AUX 1 lines.
As an example, working from the left side of the ARTHUR mixer, you could start by mounting a mic in unit,
then add a spring unit followed by all the other input and output units. In this particular case, only the rst
mic unit (e.g. for a lead vocal) will benet from the spring unit’s reverb. All other input units (mounted to the
right of the spring unit) will be summed through the L/R Master (g. 1) and will receive their reverb from
another (external) effects unit. Should you prefer to use the spring unit reverb on all the input units, you
must mount it right next to the L/R Master, on the left hand side.
Important: If you want to have your spring unit as the nal unit on the right side of the mixer - as many users
prefer - you must rst deactivate the summing amp on the L/R Master (g. 2). This is done by depressing
the respective blue button (g. 3) on the L/R Master circuit board, which is positioned just under the fader
next to the bus connector.
Now let’s take a look at some of this unit’s innovative features.
Fig. 3
Fig. 1 Fig. 2
ANY OTHER INPUT
AUX1 to Spring
ANY OTHER INPUT
AUX1 to Spring
SPRING
left side of the MASTER
ANY OTHER INPUT
AUX1 to MASTER
MASTER
ANY OTHER INPUT
AUX1 to Spring
MASTER
ANY OTHER INPUT
AUX1 to Spring
SPRING
right side of the MASTER
released
depressed
ART48 - SPRING
Driver section
The spring unit includes three output and input amps.
Please note that all three phone connectors are intended for sending
balanced signals, using space-saving stereo phone plugs. The tip connects
as usual to the hot signal (+), the ring to the cold (-) and the sleeve to the
ground.
One advantage of using phone plugs is that you can also connect an
unbalanced music signal, via a mono jack, to any of the outputs.
The spring unit receives and sums the AUX 1 from the bus.
Setting the AUX 1 knob on each individual input channel (mic In, yellow
instrument in, or stereo in) lets you send the desired amount of signal to the
spring unit.
The “AUX1 to spring” level fader(1.) lets you control the amount of signal
being sent to the spring reverbs. The two “nominal and peak” LED VU (2.)
controls will help you determine the best position for this fader.
However, driving the actual springs is also a matter of taste:
Keeping the signal down on the send level fader creates a smoother
reverberation effect with slightly longer delay. Pushing the signal on the
send level fader makes the reverberation sound richer and shorter, but also
slightly more metallic.
Activating the delay section - by depressing the Delay On(3.) switch (green
light) - lets you add a retard or delay before the signal is sent to the springs.
This effect imitates the room acoustic of a concert hall or church, where an
instant may pass before you can hear the reections from the ceiling and
walls (100 ms for example). The knob labeled 20ms/200ms(4.) reacts on the
delay time, which is adjustable from 20 ms to 200 ms.
The echo puts a soft echo on the springs, imitating a room acoustic with
added echo effect such as a big bathroom, a car park with a long echo, or a
concert hall with a short echo.
Activate this section using the Echo On(5.) switch (green light). Use the
Slow/Fast knob(6.) to set the speed of the echo repetitions and the Short/
Long knob(7.) to set the length of the echo before it fades away.
As its name implies, the Short/Long(8.) time knob makes the reverberation
time longer as it is turned from left to right i.e. short to long. Aside from
determining the amount of reverberated signal applied to the original, it also
forms an important “artistic” parameter: In a ballad or spacey piece of music,
a long decay will t well, giving depth to the overall sound. However, in a fast
piece, a short decay will keep the result drier and less “confused”.
The reverb mode section lets you choose between four different spring
characteristics. These will either result in richer or more transparent
reections (ROOM - HALL)(9.), or in warmer or harsher ones (WOOD -
GLASS)(10.). Note: This section does not apply the usual equalizer on the
reverb’s output, but instead consists of four selectable drivers, which drive
the springs in different ways.
1.
2.
3. 4.
5.
6.
7.
8.
9. 10.
ART48 - SPRING
Routing section
The routing section involves various reverb outputs.
The output fader(11.), when manipulated, sends the reverb signal to
the master L and R outputs. The PAN knob(12.) alters the proportion of
reverberated signal sent to the left or right channel.
The AUX 2(13.), AUX 3(14.) and PFL(15.) knobs control the amount of
reverb signal sent to the respective auxiliary masters. The PFL, in this
instance, has a slightly different function, being used more as a “volume”
knob. For example, should the PFL master output be feeding an additional
stage monitor, this controllable PFL allows you to add a gradual amount of
reverb to the monitor line.
The spring unit also includes a separate AUX 1 output, referred to as the dry
out. Directly connected to the summed signal of the AUX 1 bus, it
enables the AUX 1 signal to be picked up parallel to the spring unit, in order
to drive an additional outboard reverb or other effects unit. These additional
effects devices will return via the return input on the L /R Master unit (mono),
or via a separate Stereo In or Multiple unit. The level of the AUX 1 output is
controlled by the dry out volume knob.
The spring unit as a stand-alone unit
As previously mentioned, the spring unit is also designed for use as a stand-
alone reverb that can be connected to any mixing console, added to guitar
pedals, or linked to a computer for home recording etc.
When connected to the ARTHUR mixer, the spring unit is powered by the
mixer’s supply, via the bus. When used as a stand-alone reverb, a power
supply (PS-12) must be connected directly to the unit’s DC In socket(16.).
The spring unit can receive a signal from two sources: the AUX 1 directly
from ARTHUR’s bus when used together with the ARTHUR mixer, or from
the external input, when used as a stand-alone unit.
The External Input(17.) includes a Ext In Gain(18.) control knob, which can
be found under the external input phone connector. The gain is adjustable
from -5dB to +20dB, enabling both line signals and weaker signals from
pedals, computers and other devices to be accommodated. Having
connected the signal source to the ext in, it will then appear at the send
fader for processing as described above.
When used as a stand-alone unit, the spring unit’s routing section, L/R fader,
AUX 1 and 2 and PFL will be out of action. This is because they normally
“look” to the mixer’s bus, which will not be here in this instance.
So, the output from the spring unit will, instead, be routed through the
reverb output section. The Volume knob(19.) sets the output level, while
the proportions of original sound (dry) and reverberated sound (wet) are set
using the Mix knob(20.).
If the spring unit is connected to a mixing console, you might set the mix
knob to the right (wet) in order to add the original sound through your mixer’s
loop. If using the unit with guitar pedals, where no parallel loop is provided,
the mix knob will then prove extremely helpful.
The Dry Out(21.) - whose level is controlled by the Dry Out volume knob
(22.) - drives the dry signal that is not inuenced by the effect. This might be
useful for feeding another external effect or a stage monitor.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
TECHNICAL SPECS
External Input impedance:
External Output impedance:
Dry output impedance:
Gain range:
External out frequency response: (-3dB)
Dry out frequency response: (-3dB)
Equivalent input noise (EIN):
Delay Time:
Echo repeat time:
Power consumption:
Size & Weight:
48 kohm
270 ohm
300 ohm
+8 to +24 dB
50 Hz - 50 kHz
5 Hz - 50 kHz
102,2 dB (24dB Gain, 150 ohm)
40 ms - 600 ms
40 ms (short) - 690 ms (long)
120 mA
96x60x475 mm - 0.9 kg
ALL SCHERTLER® PRODUCTS ARE COVERED BY A LIMITED THREE-YEAR WARRANTY (FROM
THE DATE OF PURCHASE) AGAINST MANUFACTURES DEFECTS. DETAILS CAN BE OBTAINED
FROM YOUR LOCAL DEALER/REPRESENTATIVE. SCHERTLER SA STRONGLY BELIEVES IN
“COMMON SENSE” AND THUS, MISUSE OF OUR PRODUCTS ARE NOT COVERED UNDER
RIGHTS OBTAINED THROUGH OUR WARRANTY POLICY OR THAT OF INTERNATIONALLY
RECOGNIZED TERMS AND CONDITIONS.
SCHERTLER SA IS CONSTANTLY AIMING TO IMPROVE ITS RANGE OF PRODUCTS THEREFORE,
SCHERTLER SA RESERVES THE RIGHT TO AMEND PRODUCT
SPECIFICATIONS WITHOUT NOTICE.
THE SCHERTLER® NAME/LOGO ARE REGISTERED TRADE-NAMES/ TRADEMARKS OF
SCHERTLER SA, SWITZERLAND.
All SCHERTLER® PRODUCTS ARE OF PROPRIETARY TECHNOLOGY AND COVERED BY ONE
OF MORE WORLDWIDE PATENTS.
SIGNAL FLOW
EXT IN
GAIN
EXTERNAL
IN
+
AUX 1
DELAY DSP
ON / OFF
DELAY TIME
ECHO DSP
ON / OFF
REPEAT TIME
SPEED
ROOM/HALL
GLASS/WOOD
TO SPRINGS
DRY OUT
DRY OUT
VOLUME
LONG SPRING
SHORT SPRING
DECAY TIME
+
+EXTERNAL OUT
EXT OUT
VOLUME
DRY/WET
SPRING MODULE / ARTHUR FORMAT 48
BLOCK DIAGRAM 2017
TO LR FADER
PAN
AUX2 SEND
AUX3 SEND
PFL SEND
ROUTING
SECTION
16 PIN
MAIN
BUS
AUX1
TO SPRING
FADER
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