Pre-/Passive CONTROL - WLM

1. Thanks…!
PRE/PASSIVE CONTROL (PPC)
Manual
….for the purchase of the WLM PRE-AMP PPC and the confidence in our company you
have thus proven.
Due to the many features we have integrated into the unit, we ask you to read this
manual carefully before installing and using this pre-amplifier. Your advantage: carefree
use and improved sound reproduction.
2. Supply
The supply of the PPC consists of:
• 1 Power cable
• 1 PPC-Pre-Amp
• 1 Remote Control (Option)
• Manual
The packaging of the PPC provides a perfect protection to our product during
transportation. We recommend keeping it for future shipping needs.
3. Security advice
All elements important for the operation and the functioning are accessible from
the outside. There are no fuses in the inside which you may have to replace!
Opening the unit will entail loss of your right for warranty claim.
Before connecting your cables or altering cable connections at a later stage, make
sure all units of the chain are shut off.
4. Positioning
Choose a location that will keep the PPC at distance from amplifiers and other units
having transformers.
For the infrared dialogue between the RC and the PPC we recommend direct sight
contact from the usual listening location to the IR-receiver eye of the PPC.
Although emitting very little heat, the PPC should be placed free-standing to allow air
circulation at the sides of the unit.
Protect the PPC from heat, humidity and mechanical damage (drops, hard hitting etc.)
MANUAL WLM PPC 1/9

5. Description
Front Rear
The PPC can be used between the source players and the amplifier(s) of your chain
either in a passive or part-active pre-amplifier operation. Especially through the separate
active "manipulation" of highs and lows of a signal the ambitious listener will appreciate
the unique possibilities of sound modulation according to the prevailing room acoustics
and/or his personals taste. The sound reproduction thereafter will be felt as being more
pleasant and musical enjoyment as more intensive.
At the front you will find the control lights, the elements for the operation and the IR
receiver of the RC (Option):
• IR Control IR reception eye for the RC
• On/Off LED Control light for IR and STANDBY
• VOLUME Volume adjustment
• BASS Low frequency adjustment
• INPUT 1, 2, 3 Input selection switch 1 to 3
• SAT + WOOFER Switch position for the operation with SUB
• FULL RANGE Switch position for the operation w/o SUB
• HARMONIC WAVE Switch for the harmonic wave adjustment
At the rear are located the connections for the 3 LINE INPUTS, the OUTPUTS to the
amplifier(s) – all as asymmetrical RCA pins, and the main ON/OFF switch including the
port for the power connection, also containing the fuse box:
• POWER ON/OFF ON/OFF switch
• POWER Power connection including fuse box
• INPUT 1, 2, 3 3 Line-Inputs (RCA)
• MAIN OUT / LOW AMP Output full range or medium/low frequencies
(Bi-Wiring) – adjustable
MANUAL WLM PPC 2/9

• HIGH AMP Output of the high frequencies - adjustable
• PRE OUT LINE Direct signal output (no adjustment)
5.1 Remote Control (RC)
With the RC (optional) you may put the PPC in STANDBY (the red LED stays lit, the blue
LED will extinguish) and back in the operation mode.
In addition, the RC offers a very comfortable remote volume adjustment of the PPC.
(The same RC can also be used for the external WLM cross-over; the CHANGE switch
of the RC will enable you to go from volume to bass control)
The RC is powered by batteries (2 x 1.5 V).
5.2 Switch ON
Manually by the main switch at the rear (Power “ON“) the PPC will be started and is now
ready for operation. Via the RC (optional) you can put the PPC in the STANDBY mode
and back in the operation mode again.
When the PPC is switched on, the blue LED in front is lit; when using the RC, the red
LED will also light up. In STANDBY mode the blue LED will be off, the red will stay on.
Before removing the fuse, make sure the PPC is switched off and the power cable
is pulled out of the plug.
The fuse is placed at the rear, just below the power input. The fuse is defined for 125
mA/T (slow blow). The cover of the fuse box can be opened by means of a pointed tool,
the fuse can then easily be removed.
NOTE: switching in STANDBY mode is only possible via the RC. The main switch at the
rear will simply put the PPC ON and OFF.
5.3 Switch OFF
The switching off can be done in 2 steps; either by the RC in STANDBY mode or OFF by
the main switch at the rear.
In the STANBY mode all important functional elements will stay under current, the warm
up phase at the next start of operation is thus considerably reduced. The consumption of
the current during STANDBY is kept at a minimum.
For listening stops of 2 hours up to 2 days we recommend to keep the PPC in STANDBY
mode (possible only via the RC).
6. Connection of the signal sources (LINE 1 to 3)
Before starting your connections, make sure that the PPC itself and all units of the
chain in front and behind the PPC are shut off!
The PPC allows the connection of up to 3 source players (asymmetrical RCA pins). All
connections are identical and can be allocated to your liking.
The choice of actual LINE input to be played is done via the 3-position switch in front.
MANUAL WLM PPC 3/9

7. Outputs
You may choose between 3 outputs:
1 Output w/o adjustment (PRE OUT LINE)
2 Outputs with adjustment (MAIN OUT / LOW AMP und HIGH AMP)
At the output PRE OUT LINE the signal will remain intact in its full frequency width, as
received.
The output MAIN OUT / LOW AMP can be employed either fort he connection of a full
range speaker or the connection of the medium/low driver (e.g. Bi-Amping). In the latter
case the tweeter of the same speaker will be connected to the output HIGH AMP.
The adjustment of the output MAIN OUT / LOW AMP can be done either via the BASS
potentiometer (low frequency adjustment) and/or additionally via HARMONIC WAVE
switch at the front (high frequency adjustment).
The only possible adjustment of the HIGH AMP output is the HARMONIC WAVE switch
at the front (high frequency adjustment).
The amplification of the incoming signal goes from -indefinite to 0 dB. Since this is a
passive pre-amp, there is no active amplification; it is a passive diminuer which is
reducing the signal to –indefinite. Advantage: the signal does not follow an active
amplification path.
8. Why adjustment?
It is a known fact that there is hardly a speaker capable of reproducing the audio signal
across the entire frequency range in a technically correct way; i.e. the passive speakers
have become very fast elements necessitating electronic support due to the high degree
of mechanical dampening and their light structure (quick reacting cones). Only in this way
the full bass signal can be reproduced at the same level of performance and in an
adequate speed.
At the PPC outputs of MAIN OUT the signal can be adjusted in the low and in the high
frequencies to match the prevailing acoustics of the room, taking also into account the
specific characteristics of the speakers.
This way the frequency range delivered by the speaker will be considerably extended
and deepened.
9. SUB WOOFER / FULLRANGE (Switch)
In the FULL RANGE operation the frequency range at the MAIN OUT output is from 10
Hz to 100 kHz, the continuous bass potentiometer is working at 30 Hz, up to +12dB.
For the operation with SUB WOOFER the frequency band width at MAIN OUT is
automatically limited to a range from 80 Hz to 100 kHz, only the frequencies of low
medium upwards are offered. The operating frequency of the bass potentiometer is 80
Hz (0 to +12dB continuous))
The SUB WOOFER will be connected at the PRE OUT LINE of the PPC and adjusted
separately by the WLM BC (BASS CONTROL).
The HARMONIC WAVE function (adjustment of the high frequencies of a given signal)
can be used in the FULL RANGE and in the SUB WOOFER operation.
MANUAL WLM PPC 4/9

10. Examples of connection
The following pictures should explain the various connection possibilities of the PPC and
in a specific case simplify your connection.
In all instances the sources (CD, LP, tuner etc.) are to be connected to the 3 INPUTS (1
to 3).
The shown examples are different by the way the amplifiers and loudspeakers are
operated and connected, passive or part active.
10.1 Passive operation (w/o adjustment)
The drawing is showing the (classical)
passive connection of a stereo
amplifier or of 2 mono amps.
The signal is passed 1to1, as
received from the source, directly to
the output of the PPC, without any
intervention. In essence, the signal
remains intact and is given to the
amplifiers without any loss.
An adjustment of the lows and/or the
highs does not take place and is not
possible at this output.
10.2 Part active operation: 1 amp, possibility of adjustment of highs and lows
The amp is to be connected to the
MAIN OUT of the PPC (stereo amp or
2 monos); to the amp is connected a
pair of full range speakers.
Via the PPC the high and/or the low
can now be adjusted.
10.3 Part active operation: 2 amps (Bi-Amping) with separate adjustment
possibility of the high and the low
Connect to the MAIN-OUT LOW the
amp for the medium/low and to the
HIGH the amp for the tweeter of a pair
of speakers.
The low and the high of the 2 amplifier
lines are adjusted separately by the
potentiometer (for low) and the switch
for the (tweeter).
MANUAL WLM PPC 5/9

10.4 Part active operation: 1 amp for medium/high (main speaker) plus 1 amp for
Sub-Woofer (via WLM BC)
Connect to MAIN OUT the amp
(stereo amp or 2 monos) for the
medium/high portion of the signal fed
to the main speaker.
By switching to SAT + SUB at the
front of the PPC the high and the
medium are adjusted as before,
however now the latter at 80 Hz
(instead of 30 Hz).
To operate the SUB WOOFER
connect the WLM BASS CONTROL
(BC) plus adequate amp and subwoofer
to the direct exit of the PPC.
Via the BC the extension of the bass
performance can then be adjusted.
10.5 Part active operation: 1 amp each for high and medium plus 1 amp for low (via
BC)
11. General remarks to the choice of the amplifiers
This example of a bi-amp operation of
the main speaker plus sub-woofer is
showing the widest configuration possible
with the PPC.
Connect the amp for the medium to
MAIN OUT LOW, the amp for the tweeter
of the main speaker to the HIGH output.
At the direct output of the PPC connect
the WLM BC, plus amp and sub-woofer.
Via the MAIN-OUT high and medium can
be adjusted separately; via the BC the
low can be adjusted.
It is up to your personal preference and budgetary allowance which amp you want to use.
You may choose amps based on tubes or transistors, or both; however not in a mix
within highs or medium. To power the sub-woofer we recommend a transistor amp
because of its higher dampening capability. Even if only a twin signal is given to the amp
of the sub, you will nevertheless need a stereo amp for the sub-woofer. Please connect
the red end of the connecting cable to the plus/red pole of the right channel and the black
end to the plus/red pole of the left channel.
Keep in mind that a weak amp will lower the performance level of the entire chain, even if
the other amps are working at a much higher level of performance. The same comment
will apply to connecting and loudspeaker cables. They should all be of a similar level of
quality and performance.
MANUAL WLM PPC 6/9

11. Specification
Pre-amplifier with filters of third degree
Double Mono-Structure
Asymmetrical in- and outputs (RCA)
3 LINE-inputs
3 outputs
- 2 outputs MAIN OUT (adjustment is possible):
- LOW AMP (for medium/low or full range)
- HIGH AMP (for high)
- 1 output PRE OUT LINE (direct output w/o adjustment)
THD 0,001% at 20 Hz to 20 kHz
Frequency range PRE OUT LINE: 0 Hz to 100 kHz (w/o adjustment)
Frequency range MAIN OUT: 10 Hz to 100 kHz (adjustment is possible)
Cut-off frequency (overlapping) at MAIN OUT:
- Low, Full Range from 10 Hz to 100 kHz
- High from 1 kHz to 100 kHz
Low adjustment FULL RANGE operation: at 30 Hz, 0 -12 dB (continuous)
High adjustment 10 kHz, +3dB (by switch)
SUB WOOFER operation: at 80 Hz, -6 to +6dB (continuous)
Power: 50Hz/230V (not to be switched to 60Hz/110V)
Power consumption : max. 15 Watt (normal operation)
max. 1 Watt (STANDBY)
Fuse: 125mA/T (accessible from the outside).
MANUAL WLM PPC 7/9

11. Warranty
Limited Warranty
During the warranty period the company WLM will guarantee that their products are well
functioning and free of flaws.
The warranty period is: PRE / PASSIVE CONTROL - 2 years (counted from the date of
purchase from an authorized WLM-Dealer).
Condition for the warranty service is that the products are operated in accordance with
this manual.
During the warranty period WLM will replace or repair the defect parts free of charge to
the customer.
Condition is however:
• The warranty registration card is received by WLM within 30 days after the date of
purchase.
• The unit is not showing any traces of physical damage and inside there are no
signs of overheating due to wrong installation/operation resulting in an overloading
of certain parts.
• The PCBs and components thereof are not showing any signs of undue handling,
regardless whether the intention was to repair or to modify the unit under claim.
• There is no indication what-so-ever that the WLM products have been operated
differently as specified by the manual.
In addition, the customer will loose his right for a warranty claim when the serial-Nr. of the
unit in question has been modified, removed or manipulated in any way. WLM will not be
held responsible for damages resulting from repairs executed by un-authorized
personnel.
Collateral Damage
During the duration of this limited warranty period (and there-after) WLM will not be
responsible for collateral damage, directly or indirectly linked to the operation of the WLM
product.
Warranty Claim
The customer may on the basis of this limited warranty claim the repair or replacement of
the defective part by the manufacturer or the authorized dealer with no charge to him. For
the claim please contact either WLM directly or the WLM distributor in your country. After
receipt of the claim confirmation please send the unit under claim to the shown address.
The defect will be examined and, when justified, will be repaired at no cost to the
customer. The customer will have to bear the cost of shipment. Without a corresponding
warranty claim (received within 30 days after the date of purchase at the address below)
no warranty claim will be accepted or processed.
WLM Loudspeakers
Treietstrasse 56
6832 Sulz
AUSTRIA
Phone: +43 (0)5522 44 641 (Customer Service)
e-Mail: info@wlm-loudspeakers.com
Web: www.wlm-loudspeakers.com
MANUAL WLM PPC 8/9

Warranty Registration
Please ask your dealer to fill in this form at the time of the purchase.
This registration will entitle you to call on WLM for technical support and it is
a prerequisite for an eventual warranty claim against WLM.
Please send your
registration to:
WLM Loudspeakers
Treietstrasse 56
A-6832 Sulz
Austria
Customer Service:
Phone : +43 (0)5522 44641
Fax : +43 (0)5522 44641-74
Web : www.wlm-loudspeakers.com
Unit/Model: PPC (PRE/PASSIVE CONTROL) Serial-Nr:........................................
BC (BassControl) Serial-Nr:........................................
PC (PASSIVE CONTROL) Serial-Nr:….....................................
Date of Purchase:.............................Dealer Name:....................................................
Dealer Address:..........................................................................................................
First/last name of customer: ...................................................................................
Address Street: ...................................................................................
Postal Code/Town: ...….............................................................................
Customer Contact Phone: ...................................................................................
Your comments are always appreciated:
Fax: ...................................................................................
E-Mail: ...................................................................................
MANUAL WLM PPC 9/9