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TPC25
active crossover
user manual
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Musikhaus Thomann
Thomann GmbH
Hans-Thomann-Straße 1
96138 Burgebrach
Germany
Telephone: +49 (0) 9546 9223-0
E-mail: info@thomann.de
Internet: www.thomann.de
02.10.2015, ID: 166613
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Table of contents
1 General information................................................................................................................................. 4
1.1 Further information........................................................................................................................... 5
1.2 Notational conventions.................................................................................................................... 6
1.3 Symbols and signal words............................................................................................................... 6
2 Safety instructions..................................................................................................................................... 8
3 Features....................................................................................................................................................... 12
4 Connections and operating elements........................................................................................... 13
5 Installation and starting up................................................................................................................ 18
6 Technical specifications....................................................................................................................... 23
7 Plug and connection assignment.................................................................................................... 25
8 Cleaning....................................................................................................................................................... 26
9 Protecting the environment.............................................................................................................. 27
Table of contents
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1 General information
This manual contains important instructions for the safe operation of the unit. Read and follow
the safety instructions and all other instructions. Keep the manual for future reference. Make
sure that it is available to all those using the device. If you sell the unit please make sure that
the buyer also receives this manual.
Our products are subject to a process of continuous development. Thus, they are subject to
change.
General information
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1.1 Further information
On our website (www.thomann.de) you will find lots of further information and details on the
following points:
Download This manual is also available as PDF file for you to download.
Keyword search
Use the search function in the electronic version to find the topics of
interest for you quickly.
Online guides
Our online guides provide detailed information on technical basics
and terms.
Personal consultation For personal consultation please contact our technical hotline.
Service
If you have any problems with the device the
customer service will gladly assist you.
General information
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1.2 Notational conventions
This manual uses the following notational conventions:
The letterings for connectors and controls are marked by square brackets and italics.
Examples: [VOLUME] control, [Mono] button.
1.3 Symbols and signal words
In this section you will find an overview of the meaning of symbols and signal words that are
used in this manual.
Letterings
General information
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Signal word Meaning
DANGER! This combination of symbol and signal word indicates an
immediate dangerous situation that will result in death or
serious injury if it is not avoided.
NOTICE! This combination of symbol and signal word indicates a pos‐
sible dangerous situation that can result in material and
environmental damage if it is not avoided.
Warning signs Type of danger
Warning – high-voltage.
Warning – danger zone.
General information
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2 Safety instructions
This device is used for splitting an incoming audio signal into separate frequency bands, that
are made available at the outputs. Use the device only as described in this user manual. Any
other use or use under other operating conditions is considered to be improper and may result
in personal injury or property damage. No liability will be assumed for damages resulting from
improper use.
This device may be used only by persons with sufficient physical, sensorial, and intellectual
abilities and having corresponding knowledge and experience. Other persons may use this
device only if they are supervised or instructed by a person who is responsible for their safety.
Intended use
Safety instructions
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DANGER!
Danger for children
Ensure that plastic bags, packaging, etc. are disposed of properly and are not
within reach of babies and young children. Choking hazard!
Ensure that children do not detach any small parts (e.g. knobs or the like) from
the unit. They could swallow the pieces and choke!
Never let children unattended use electrical devices.
DANGER!
Electric shock caused by high voltages inside
Within the device there are areas where high voltages may be present.
Completely disconnect the device from the power supply before you open or
remove covers. Mount all covers and attach them firmly before connecting the
device again.
Safety
Safety instructions
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DANGER!
Electric shock caused by short-circuit
Always use proper ready-made insulated mains cabling (power cord) with a pro‐
tective contact plug. Do not modify the mains cable or the plug. Failure to do so
could result in electric shock/death or fire. If in doubt, seek advice from a regis‐
tered electrician.
NOTICE!
Risk of fire
Do not cover the device nor any ventilation slots. Do not place the device near
any direct heat source. Keep the device away from naked flames.
Safety instructions
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NOTICE!
Operating conditions
This device has been designed for indoor use only. To prevent damage, never
expose the device to any liquid or moisture. Avoid direct sunlight, heavy dirt, and
strong vibrations.
NOTICE!
Power supply
Before connecting the device, ensure that the input voltage (AC outlet) matches
the voltage rating of the device and that the AC outlet is protected by a residual
current circuit breaker. Failure to do so could result in damage to the device and
possibly injure the user.
Unplug the device before electrical storms occur and when it is unused for long
periods of time to reduce the risk of electric shock or fire.
Safety instructions
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3 Features
n Operating modes: 2-way stereo / sub mono
n 125 Hz high and low pass filter
n Crossover frequency configurable via internal jumpers
n Transition steepness 24 dB / octave (Linkwitz-Riley)
n XLR in and outputs electronically balanced
n Controllable limiter
Features
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4 Connections and operating elements
Front panel
Connections and operating elements
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1 [LIMITER]
Indicator LEDs [CH1] and [CH2] (red). If you overload one or both channels of the device by an excessive input signal,
the associated LED flickers or lights up.
2 [ON]
Power indicator. This LED lights up continuously during normal operation and turns off when the device is turned off.
3 [POWER ON]
Main switch to turn the device on and off.
Connections and operating elements
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Rear panel
Connections and operating elements
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4 IEC chassis plug with fuse holder.
5 [MONO LOW]
Crossover XLR output (low pass) to connect a subwoofer power amp for mono operation. The signals of both chan‐
nels are present at this output.
6 [HI 1]
Crossover XLR output (high pass) to connect a mid / treble speaker power amp for stereo operation. Channel 1 signal
is present at this output.
7 [LOW 1]
Crossover XLR output (low pass) to connect a subwoofer power amp for stereo operation. Channel 1 signal is present
at this output.
8 [GND | LIFT]
To avoid ground loops, you can use this switch to disconnect the earth pin of channel 1 and the signal ground in the
device (‘Lift’ position / switch not pressed: no connection). ‘Ground’ position / switch pressed: Earth pin and signal
ground are electrically connected).
9 [IN 1]
Balanced XLR input to connect an audio device (e.g. mixer) to channel 1.
Connections and operating elements
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10 [LIMITER THRESHOLD]
Rotary control for stepless threshold adjustment of the built-in limiter.
11 [HI 2]
Crossover XLR output (high pass) to connect a mid / treble speaker power amp for stereo operation. Channel 2 signal
is present at this crossover output.
12 [LOW 2]
Crossover XLR output (low pass) to connect a subwoofer power amp for stereo operation. Channel 2 signal is present
at this crossover output.
13 [GND | LIFT]
To avoid ground loops, you can use this Ground / Lift switch to disconnect the earth pin of channel 2 and the signal
ground in the device (‘Lift’ position / switch not pressed: no connection. ‘Ground’ position / switch pressed: Earth pin
and signal ground are electrically connected).
14 [IN 2]
Balanced XLR input to connect an audio device (e.g. mixer) to channel 2.
Connections and operating elements
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5 Installation and starting up
Unpack and carefully check that there is no transportation damage before using the unit. Keep
the equipment packaging. To fully protect the device against vibration, dust and moisture
during transportation or storage use the original packaging or your own packaging material
suitable for transport or storage, respectively.
Establish all connections as long as the unit is switched off. Use the shortest possible highquality cables for all connections.
The unit has been designed for rack mounting in a standard 19-inch rack; it occupies one rack
unit.
Rack mounting
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The device is configured by jumpers that are inserted in a particular schema on the internal
circuit board. The following illustrations show the various configuration options.
DANGER!
Electric shock caused by high voltages inside
Within the device there are areas where high voltages may be present.
Completely disconnect the device from the power supply before you open or
remove covers. Mount all covers and attach them firmly before connecting the
device again.
NOTICE!
Qualified personnel
The configuration of the device may only be performed by qualified personnel or
an authorized service workshop.
When removing and inserting the jumpers, be careful not to damage the PCB
contacts.
Device configuration
Installation and starting up
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Overview plug-in locations
Installation and starting up
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Set the crossover frequency for CH1 and CH2 to 80 Hz, 125 Hz or 160 Hz as shown in the illus‐
tration. The black bars mark the jumper positions. For example, to set the cut-off frequency of
channel CH1 to 80 Hz, plug jumpers 28 and 30 left, jumpers 29 and 31 right, jumpers 20 and 22
at top and jumpers 19 and 21 at the bottom (all figures in reading direction).
Crossover frequency configura‐
tion for CH1 and CH2
Installation and starting up
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Set the delay time for the subwoofer outputs as shown in the illustration to 0 ms, 300 ms or
600 ms. The black bars mark the jumper positions. For example, to set the delay time of channel
CH1 LOW to 0 ms, plug jumper 23 left (in reading direction).
Configuring the delay time
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6 Technical specifications
System 2-way stereo / sub mono
Filter type Linkwitz-Riley, 24 dB / octave
Cut-off frequencies 80 Hz, 125 Hz, 160 Hz
Delay
0 ms, 300 ms, 600 ms
Frequency response 20 Hz…20 kHz
THD, noise 0.003 % at 100 Hz
0.004 % at 1 kHz
Crosstalk
> 110 dB at 20 Hz…1 kHz
> 100 dB at 20 Hz…20 kHz
In / outputs XLR, balanced
Power consumption 28 W
Operating supply voltage
AC 230 V , 50 Hz
Technical specifications
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Fuse 5 mm × 20 mm, 400 mA, 250 V, slow blow
Dimensions (W × D × H) 483 mm × 166 mm × 43.8 mm
Weight 2.5 kg
Technical specifications
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7 Plug and connection assignment
This chapter will help you select the right cables and plugs to connect your valuable equip‐
ment in such a way that a perfect sound experience is ensured.
Please note these advices, because especially in ‘Sound & Light’ caution is indicated: Even if a
plug fits into the socket, an incorrect connection may result in a destroyed power amp, a short
circuit or ‘just’ in poor transmission quality!
1 Ground, shielding
2 Signal (in phase, +)
3 Signal (out of phase, –)
Introduction
XLR plug (balanced)
Plug and connection assignment
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8 Cleaning
The fan grids of the device must be cleaned on a regular basis to remove dust and dirt. Before
cleaning, switch off the device and disconnect AC-powered devices from the mains. Use a lintfree damp cloth for cleaning. Never use solvents or alcohol for cleaning.
Fan grids
Cleaning
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9 Protecting the environment
For the transport and protective packaging, environmentally friendly materials have been
chosen that can be supplied to normal recycling.
Ensure that plastic bags, packaging, etc. are properly disposed of.
Do not just dispose of these materials with your normal household waste, but make sure that
they are collected for recycling. Please follow the notes and markings on the packaging.
This product is subject to the European Waste Electrical and Electronic Equipment Directive
(WEEE). Do not dispose with your normal household waste.
Dispose of this device through an approved waste disposal firm or through your local waste
facility. When discarding the device, comply with the rules and regulations that apply in your
country. If in doubt, consult your local waste disposal facility.
Disposal of the packaging mate‐
rial
Disposal of your old device
Protecting the environment
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Notes
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Notes
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Notes
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Musikhaus Thomann · Hans-Thomann-Straße 1 · 96138 Burgebrach · Germany · www.thomann.de
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