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2V DIRECT IN BYPASS FUNCTION

The Signature amplifiers have a direct in bypass 
feature for the optimum sound quality when running 
the system from a DSP or DSP equipped source 
unit. To access this feature the small section of the 
bottom plate needs to be removed. Depending on 
which S-series model you have, the bypass is put 
on different places on the amplifier. The amount of 
jumpers on the amplifier is based on the amount 
of channels it has:

Professional Tip:

S1 (1-channel)

S2 (2-channel)

S4 (4-channel)

Gold plated PCB jumpers located on 
the circuit boards are used to select the 
Bypass function. These jumpers need 
to be moved to bypass the pre-amp / 
filter section.

ACTIVATE 2V DIRECT IN BYPASS PT.1

The default setting of the amplifiers when they 
are sold is that the direct in bypass function is 
OFF. To use the function, first disconnect the 
amplifier from all types of connections and remove 
the small bottom panel plate from the amplifier. 
There are 4 screws that needs to be removed. 
 
 
 
 
 
 
 
 
 
 
Locate the jumpers on the circuit board and move 
the jumpers from 2 pins right-sided to the 2 pins 
left-sided. 

WARNING!

 All jumpers should be moved 

to the same position. If any aren’t moved then an 
optimum setup will be near impossible to achieve.

Professional Tip:

ACTIVATE 2V DIRECT IN BYPASS PT.2

On Signature 1 and Signature 2 the jumper(s) need to 
be in the ON position to activate the bypass function.  
On Signature 4 move the jumpers to the ’BPS’ position. 
       
ON         OFF      ON         OFF       BPS

Professional Tip:

 ON         OFF      ON         OFF       BPS

DIRECT IN BYPASS vs CROSSOVER

When the direct in bypass mode is turned off, you 
can use the crossover functions on the side panel 
normally to adjust your sound systems performance 
(input sensitivity 1-4V). 

(Note:)

 When the bypass 

feature is activated NONE of the front panel controls 
will function. The  input signal will then go in as a 2V 
direct signal input in the amplifier (input sensitivity 
fixed at 2V).
 
Bypass is only compatible with systems that have 
a DSP or DSP equipped head unit. All functions 
such as crossovers and level adjustments need to 
be set up on the DSP.
 
The direct in bypass mode is used to achieve the     
optimum sound quality when running the system 
from a DSP or DSP equipped source unit. This 
removes the pre-amp and filters from the signal 
path which improves both signal to noise ratio and 
sound quality.

WARNING!

 The jumpers should never be removed 

from the amplifier. If you remove the jumpers the 
amplifier will have no output and will not function 
properly.

Professional Tip:

Summary of Contents for Signature S1

Page 1: ...USER MANUAL ...

Page 2: ... level control BASS EQ etc 5 Features on each model 5 S1 speaker wiring One or more subwoofers 6 S2 speaker wiring Front speakers 7 Subwoofer 7 S4 speaker wiring Four speakers 8 Two speakers and bridged subwoofer 8 Two subwoofers or a stereo speaker pair connected in bridge mode 9 Troubleshooting 10 Testing 10 Professional tips 11 12 Specifications 13 Product markings 14 Technical Assistance For t...

Page 3: ...best performance Both the positive wire and the ground wire must have the same size OFC copper NOTE To avoid cable fire be sure not to over size the main fuse value for the power wires THE DC FEED Maximum main fuse values for different cable sizes 6 mm2 10 AWG 25 A 10 mm2 8 AWG 40 A 16 mm2 6 AWG 60 A 20 mm2 4 AWG 100 A 35 mm2 2 AWG 150 A 50 mm2 1 AWG 200 A The S2 and S4 models are Class AB amplifi...

Page 4: ...d Wire ties Insulating grommet or insulating tube Power wiring There are no internal fuses in the amplifiers The use of an external fuse is essential for safety Fuses Power terminal 12V Be sure to use a rubber grommet or a plastic insu lating tube where the cable passes the firewall or other places where it can be easily jammed Use wire ties to secure to existing cables in the engine compartment C...

Page 5: ...ct the radio power antenna lead remote turn on off from the car stereo to the amplifier remote connection This turns on the amplifier whenever the car stereo is turned on You can either use the built in remote cable in the RCA cable itself or use a separate cable Sometimes a small disturbance may enter the amp lifier coming from the remote voltage through the built in remote wire and into the RCA ...

Page 6: ... activate the filter or OFF if you want to run the amplifier in full range mode without limiting the frequency range The S4 model have the same setup of filters on channels 1 2 and 3 4 as well Low Pass filter LPF S2 S4 Features on each model Bass EQ S2 S1 Bass EQ or Bass boost is used to increase the bass volume at a specific frequency 45 Hz You can adjust the amplification from 0 dB no amplificat...

Page 7: ...l control box The external remote works together with the interanal gain control the setting of the internal gain decides the maximum level also for the external level control Connect to REMOTE socket on S1 Remote sub level control The low pass filter is mostly used for sub woofers It will allow low frequencies only and blocks higher frequen cies A typical setting is 60 70 Hz The LPF filter has tw...

Page 8: ...for 2 channel stereo use Filter settings CH 1 2 for subwoofer use The high pass filter blocks very low fre quencies from reach ing the speakers mostly used to protect small speakers from deep bass Set the push button to ON and the HPF LPF button to HPF button OUT to activate the filter or OFF if you want to run the amplifier in full range mode without limiting the frequency range Adjust with the H...

Page 9: ...typical setting is 60 70 Hz Set the push button to ON and the HPF LPF button to LPF button IN to activate the filter The high pass filter blocks very low fre quencies from reach ing the speakers mostly used to protect small speakers from deep bass Set the push button to ON and the HPF LPF button to HPF button OUT to activate the filter or OFF if you want to run the amplifier in full range mode wit...

Page 10: ...used for sub woofers It will allow low frequencies only and blocks higher frequen cies A typical setting is 60 70 Hz Set the push button to ON and the HPF LPF button to LPF button IN to activate the filter When the S4 is used for bridging a stereo speaker pair set use only the HPF filter Set the push button to ON and the HPF LPF button to HPF button OUT to activate the filter or OFF if you want to...

Page 11: ...down the heat sink 3 Overheating can also be caused by an impedance load below the level permitted NO OUTPUT FROM ONE OR MORE SPEAKERS Check the following 1 Balance control position 2 Fader control position 3 Speaker cable connections to amplifier and drivers 4 Signal lead plugs and cables 5 Change left and right signal lead plugs in the amplifier to see if the problem moves to a diffe rent speake...

Page 12: ...king polarity Hold the connection of the speaker wire to the terminal of a 1 5 Volt flashlight battery Tap the wire on to the terminal of the battery and observe the movement of the cone The cone should move outwards when the wire touches the battery and inwards when the battery is removed If it is the other way around the speaker has been connected backwards and it must be removed and connected c...

Page 13: ... the same position If any aren t moved then an optimum setup will be near impossible to achieve Professional Tip ACTIVATE 2V DIRECT IN BYPASS PT 2 OnSignature1andSignature2thejumper s needto be in the ON position to activate the bypass function OnSignature4movethejumperstothe BPS position ON OFF ON OFF BPS Professional Tip ON OFF ON OFF BPS DIRECT IN BYPASS vs CROSSOVER When the direct in bypass m...

Page 14: ...ontrol Power consumption idle Power consumption max Fuse no internal fuse used Dimensions HxWxD mm Dimensions HxWxD inch Extra Power terminal size Minimum rec cable size Speaker terminal size Weight Depending on cable size OFC Copper 1 D 1000 W 800 W 450 W 94 dB 150 0 06 0 09 10 Hz 250 Hz 22 kOhm 1 4 V 2V rms 400 W 45 Ohm Yes auto start 35 250 Hz 12 24 dB 0 6 dB 30 Hz ON OFF 0 180 Yes with 5 M cab...

Page 15: ...how that the product follows the health safety and environmental protection standards for products sold within the European Economic Area EEA DLS products complies with the relevant provisions of the RoHS Directive for the European Union In common with all Electrical and Electronic Equipment EEE the product should not be disposed of as household waste Alternative arrangements may apply in other ju...

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