Lang PEQ-2 User manual
PROGRAM EQUALIZER
PEQ-2
LANG SPECIALIZED AUDIO EQUIPMENT
January/2023 Rev. 1.0.
2
INTRODUCTION
CONTENTS
DESCRIPTION
COMPLETE FREQUENCY DESCRIPTIONS
FREQUENCY RESPONSE AND EQ CURVES
GETTING STARTED
APPLICATIONS
SPECIFICATIONS
SIGNAL FLOW
TROUBLE SHOOTING
WARRANTY STATEMENT
REGISTRATION
RECALL SHEETS
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INTRODUCTION
TABLE OF CONTENTS
Thank you for choosing the LANG PEQ-2 Program Equalizer.Lang Electronics inc, is dedicated to bringing you
´the sound of yesterday for tomorrow´. We specialize in capturing that unique, enticing sound that everybody has fallen
in love with. For years engineers, producers and musicians have been yearning for that classic vibe. Usually the only
option is to search for old, used original equipment that is almost always in a questionable state of operation. This
brings with it a whole lot of other issues, making the experience less than desirable. Not to mention the very high prices
asked for this equipment, which makes them virtually unobtainable for the great majority. Now it´s possible to obtain that
same sound with a brand new piece that will give you all the problem-free, heavy-duty use you´ll need for years of
music making history.
Peter Rodriguez
CEO!
Lang-Electronics inc. - Madrid, Spain
© 2023 Lang Electronics inc. is the sole owner of the copyright of all information and drawings contained in this manual which are not to be copied or
reproduced by any means or disclosed in part or whole to any third party without written permission.
Lang Electronics inc., reserves the right to alter specifications without notice. The information in this manual has been carefully checked and is
believed to be accurate at the time of publication. However, no responsibility is taken by us for inaccuracies, errors or omissions nor any liability
assumed for any loss or damage resulting either directly or indirectly from use of the information contained within it.
LANG PEQ-2
AC POWER CORD EU & US
POWER SUPPLY HA-PSU04
DESCRIPTION
Heritage Audio has recently acquired Lang Electronics Inc., a professional audio company from the 1960s dedicated to
producing high quality equipment and replacement parts at very accesible prices. The most desired product was the
PEQ-2 Program Equalizer. Unfortunately, not very many were made and those that have survived until today are carefully
guarded by their lucky owners. Many have said that they actually prefer this model to the ubiquitous Pultec program
equalizers. Both are very high quality passive equalizers with custom inductors and tone capacitors and both are from
Western Electric patents, but the fact that the PEQ-2 offers a sharper, tighter response makes it ideal for mix bus use
where flabby, undefined sound can ruin your results. A few important differences are: The PEQ-2 has nearly twice as
many frequency options to choose from…26 compared to the Pultec´s 14. The low end is infinitely more controllable as
the LANG gives you the ability to Boost and Cut at different frequencies, unlike the Pultec."There is also a very useful 20
kHz option in the High Frequency Peak Boost section that can really be helpful.So those that are lucky enough to still
have them will not let them go. In fact, many have stated that they have become their ´secret weapon´ and totally rely on
them to produce their trademark sound. So it is only fitting that the first product from the new LANG Electronics Inc. line
would be the PEQ-2.
While having a very simple, clear and easy layout, the PEQ-2 can be deceiving as it is actually capable of some very
extreme processing all while maintaining the musicality of your signal. With independent controls for Boost and Droop
(Cut) of both the High and Low bands you can quickly transform your material in interesting, creative ways that you have
almost certainly never considered before and are not even possible with the Pultec design. Convenient stepped controls
provide easy recall and settings matching when working with two units for stereo use. Once you’ve found out how to
mould your mixes with these you’ll wonder how you ever managed before.
The ability to boost and cut at the same or similar frequencies produces exciting new equalized response curves.
Experimentation is key, but you will quickly realize just how powerful this feature can be. Within no time the PEQ-2 will
most likely become one of your most used studio tools. The sheer power if offers with the ease and speed of achieving
results is impressive…
Not only does the PEQ-2 offer Low Shelf boost and cut control and High Shelf cut, but it also has a High Peak Boost with
a completely variable Q (Bandwidth) setting that spans from Sharp to Broad to cover any needs. What’s more, the range
of Boost actually varies depending on what you’re selected Bandwidth setting is to offer a very smooth and natural
response at all times… Very clever indeed.
•The Low Shelf Boost offers 8 frequencies to choose from: 20, 30, 40, 60, 80, 120, 160 & 240 Hz with up to 16 dB of
boost.
•The Low Shelf Droop offers 4 frequencies to choose from: 25, 50, 100 & 200 Hz with up to 18 dB of cut.
•The High Peak Boost offers 8 frequencies to choose from: 2.5, 3.75, 5, 7.5, 10, 12, 15 & 20 kHz with a boost that varies
the maximum between 21 and 12.5 dB depending on the Bandwidth setting.
•The High Shelf Droop offers 6 frequencies to choose from: 2.5, 5, 7.5, 10, 15 & 20 kHz with up to 16 dB of cut.
A high quality Silicon Transistor Amplifier is used in the signal path to restore the signal back to unity gain. An adjustable
Trimmer screw is located on the front panel within the LOGO, and comes after the EQ. A bypass has also been included
to make quick comparisons possible between processed and unprocessed signals. And like all the Heritage Audio
products, the LANG PEQ-2 comes equipped with custom audio transformers at the Input and Output to make sure you
always have a powerful, solid, noise-free signal to work with.
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COMPLETE FREQUENCY DESCRIPTIONS
FREQUENCY RESPONSE AND EQ CURVES
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LF BOOST
LF BOOST: 20 Hz; 30 Hz; 40 Hz; 60 Hz, 80 Hz; 120 Hz; 160 Hz; 240 Hz, Gain knob fully CW.
LF DROOF
LF DROOP: 25 Hz; 50 Hz; 100 Hz; 200 Hz, Gain knob fully CW.
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HF BOOST
HF BOOST: 2.5 kHz; 3.75 kHz; 5.0 kHz; 7.5 kHz; 10 kHz; 12 kHz; 15 kHz; 20 kHz, Gain knob fully CW, Bandwidth fully CCW
HF BOOST: 2.5 kHz; 3.75 kHz; 5.0 kHz; 7.5 kHz; 10 kHz; 12 kHz; 15 kHz; 20 kHz, Gain knob fully CW, Bandwidth fully CW (Broad).
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HF DROOP
HF DROOP: 2.5 kHz; 5.0 kHz; 7.5 kHz; 10 kHz; 15 kHz; 20 kHz, Gain knob fully CW.
GETTING STARTED
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REAR
1
2
3
POWER INPUT
To Be Connected to the HA PSU04 Power Supply
LINE OUTPUT
Male Gold Plated XLR Connector
LINE INPUT
Female Gold Plated XLR Connector
All XLRs are:
Pin 1: GND!
Pin 2: Hot!
Pin 3: Cold
1
2
3
3
2
1
GND!
Hot (+)!
Cold (-)
MALE XLR
FEMALE XLR
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9
10
11
2
1
5
6
7
12
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7
8
9
10
GAIN KNOB HF DROOP
0 to 16 dB
RED LIGHT
Indicates equipment in “ON”
EQUALIZATION SWITCH
Switches EQ IN and OUT
LF BOOST
20 Hz; 30 Hz; 40 Hz; 60 Hz; 80
Hz; 120 Hz; 160 Hz; 240 Hz.
LF DROOP
25 Hz; 50 Hz; 100 Hz; 200 Hz.
1
2
3
4
5
ORANGE ACTIVITY LIGHT
Indicates EQ is in “ON”
GAIN KNOB LF BOOST
0 to 16 dB
GAIN KNOB LF DROOP
0 to 18 dB
GAIN ADJUSTMET TRIMMER
-12 dB to +1.6 dB range
GAIN KNOB HF BOOST
21 to 12.5 dB depending on the
BANDWIDTH setting
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HF BOOST BANDWIDTH
Varies the EQ curve between
SHARP and BROAD for the HF
BOOST
HF BOOST
2.5 kHz; 3.75 kHz; 5.0 kHz; 7.5
kHz; 10 kHz; 12 kHz; 15 kHz;
20 kHz.
HF DROOP
2.5 kHz; 5.0 kHz; 7.5 kHz; 10
kHz; 15 kHz; 20 kHz.
FRONT
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3
1
3
4
POWER SWITCH
Turns the unit ON or OFF
BASS
RECORDING
APPLICATIONS
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MONITOR
SPEAKERS
THUNDERBOLT
COMPUTER
LINE INPUT
AUDIO INTERFACE
D.I. INPUT
PREAMP TT-73
OUTPUT
PREAMP TT-73
TRACK
INSERT
MONITOR
SPEAKERS
THUNDERBOLT
COMPUTER
LINE INPUT
AUDIO INTERFACE
LINE OUTPUT
AUDIO INTERFACE
INSERTED
ONTO SNARE TRACK
10
MIX BUSS
INSERT
MONITOR
SPEAKERS
THUNDERBOLT
COMPUTER
AUDIO
INTERFACE
LEFT & RIGHT
LINE INPUTS
PROCESSED
STEREO MIX
STEREO MIX DAW
LEFT & RIGHT
LINE OUTPUTS
LANG PEQ-2A
LEFT & RIGHT
LINE OUTPUTS
LANG PEQ-2A
LEFT & RIGHT
LINE INPUTS
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MASTERING
MONITOR
SPEAKERS
THUNDERBOLT
COMPUTER
AUDIO
INTERFACE
SUCCESSOR
LEFT & RIGHT
LINE OUTPUTS
LEFT & RIGHT
LINE INPUTS
MASTERED MIX
STEREO MIX DAW
LEFT & RIGHT
LINE OUTPUTS
LANG PEQ-2A
LEFT & RIGHT
LINE OUTPUTS
HA-609A
LEFT & RIGHT
LINE OUTPUTS
HA-609A
LEFT & RIGHT
LINE INPUTS
COMPRESSOR
COMPRESSOR
SPECIFICATIONS
•Line input impedance: 2400 Ωbridging, transformer balanced and floating.
•Output impedance: Transformer balanced and floating, to drive a load of 600 Ω.
•Maximum output: Greater than +26.5 dBu into 600 Ω(internally terminated).
•THD+N Ratio: 0.02 % @ 1 kHz 24 dBu, all control CCW*.
•Frequency response: 20 Hz to 20 kHz (± 0.3 dB).
•Noise floor: ≤- 86 dBu.
•Power: 48 V DC @ 60 mA.
•Dimensions (W x H x L): 482 mm x 88 mm (2 Rack units) x 153 mm.
•Weight: 3.088 Kg.
*CCW stand for fully counter clockwise – Turn all controls to the left.
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SIGNAL FLOW
INPUT
TRANSFORMER
EQ SECTION
AMPLIFIER
OUTPUT
TRANSFORMER
TROUBLE SHOOTING
PROBLEMS
SOLUTIONS
Applying Cut and Boost to the frequencies doesn´t have
any affect on the signal.
Make sure the LANG PEQ-2 isn´t in OUT mode.
The frequency range covered by the HF Boost is too
small.
Use the Bandwidth knob to adjust the bell curve of the
Peak.
The frequency range covered by the HF Boost is too wide.
Once again, use the Bandwidth knob to control exactly
how wide or narrow that adjustment needs to be.
When I activate the equalizer there is just too much of a
drop in the signal´s volume.
Becareful, you are most likely applying to much
attenuation to your processed signal.
The LANG PEQ-2 just makes every track sound too good.
Remember you are lucky enough to be working with a
piece of history. Enjoy it!
The sound is altogether to strident and screechy.
Apply a bit of HF Droop at 10, 15 or 20 kHz to soften it up.
There are too many sub sonic frequencies going on.
Use some LF Droop to cut at 20 or 50 Hz to clear things
up a bit.
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* For any further doubts or questions please get in contact with us at: support@lang-electronics.com!
LIMITED 2 YEAR WARRANTY
LANG PEQ-2 Program Equalizer is warranted by Lang Electronics Inc. to be free from defects in materials and
workmanship for the period of 2 years to the original purchaser. In the event of such defects, the product will be repaired
without charge or, at our option, replaced with a new one if delivered to Lang Electronics Inc. prepaid, together with a
copy of the sales slip or other proof of purchase date. The warranty excludes problems due to normal wear, abuse,
shipping damage or failure to use the product in accordance with the specifications.
Lang Electronics Inc. shall not be liable for damages based upon inconvenience, loss of use of the product, loss of time,
interrupted operation or commercial loss or any other damages, whether incidental, consequential or otherwise.
This warranty is not transferable.
Lang Electronics and the logo are registered Trademarks owned and/or licensed by Lang Electronics Inc.
REGISTRATION
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Please visit our website:
WARRANTY STATEMENT
https://lang-electronics.com/registration/
RECALL SHEETS
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