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HP4
Owner’s Manual
EnglishDeutsch EspañolFrançais
®
www.presonus.com
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0.1 Important Safety Instructions
The exclamation point within an equilateral triangle
is intended to alert the user to the presence of
important operating and maintenance (servicing)
instructions in this manual.
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’s enclosure that may be of sufficient magnitude to
constitute a risk of electric shock to humans.
CAUTION: TO REDUCE THE RISK OF ELEC TRIC SHOCK,
DO NOT REMOVE THE COVER. NO USER-SERVICEABLE
PARTS INSIDE. REFER SERVICING TO QUALIFIED
PERSONNEL.
CAUTION: To reduce the risk of electric shock, do not
expose this appliance to rain and moisture. The
apparatus shall not be exposed to dripping or
splashing liquids and no object filled with liquids, such as vases,
shall be placed on the apparatus.
CAUTION: These service instructions are for use by
qualified service personnel only. To reduce the risk of
electric shock, do not perform any servicing other
than that contained in the operation instructions. Repairs must
be performed by qualified service personnel.
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 a 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
(including amplifiers) that produce heat.
9. Do not defeat the safety purpose of the polarized or
grounding-type plug. A polarized plug has two blades,
with one wider than the other. A grounding-type plug
has two blades and a third grounding prong. The wide
blade and the third prong are provided for your safety.
If the provided plug does not fit 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 receptacles,
and the point where they exit from the apparatus.
11. Use only attachments/accessories specified by PreSonus.
12. Use only with the cart, stand,
tripod, bracket, or table specified
by the manufacturer or sold with
this 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. Servicing is required when the apparatus has been
damaged in any way, such as if a power-supply cord or
plug is damaged; or liquid has been spilled, or objects
have fallen, into the apparatus; or if the apparatus has
been exposed to rain or moisture, does not operate
normally, or has been dropped. All PreSonus products
in the USA should be serviced at the PreSonus factory
in Baton Rouge, Louisiana. If your product requires a
repair, contact support@presonus.com to arrange for a
return-authorization number. Customers outside the USA
should contact their local distributor. Your distributor’s
contact information is available at www.presonus.com.
15. The apparatus shall be connected to a Mains power outlet
with a protective grounding/earthing connection.
16. Where the Mains plug or an appliance coupler
is used as the disconnect device, the disconnect
device shall remain readily operable.
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EU Directives on the
Protection of the Environment
and Other Euro Stuff
RoHS This product is compliant with the EU Directive
2011/65/EU for the Restriction of the use of Certain
Hazardous Substances in Electrical and Electronic
Equipment. No lead (Pb), cadmium (Cd), mercury
(Hg), hexavalent chromium (Cr+6), PBB or PBDE
is intentionally added to this device. Any traces of
impurities of these substances contained in the parts
are below the RoHS specified threshold levels.
REACh This product is compliant with the
European Union Directive EC1907/206 for the
Registration, Evaluation, Authorization, and
Restriction of chemicals (REACh) and contains
none or less than 0.1% of the chemicals listed as
hazardous chemicals in the REACh regulation.
SPL Warning:
WEEE This symbol on the product
or its packaging indicates that this
product must not be disposed of
with other waste. Instead, it is your
responsibility to dispose of your
waste equipment by handing it over
to a designated collection point
for the recycling of waste electrical and electronic
equipment. The separate collection and recycling of
your waste equipment at the time of disposal will
help conserve natural resources and ensure that it is
recycled in a manner that protects human health and
the environment. For more information about where
you can drop off your waste equipment for recycling,
please contact your local city recycling office or the
dealer from whom you purchased the product.
CE This product complies with the European
Union Council Directives and Standards
relating to electromagnetic compatibility
EMC Directive (2006/95/EC) and the Low
Voltage Directive (2004/108/EC).
Exposure to extremely high noise levels may
cause permanent hearing loss. Individuals vary
considerably in susceptibility to noise-induced
hearing loss but nearly everyone will lose some
hearing if exposed to sufficiently intense noise
for a period of time. The U.S. Government’s
Occupational Safety and Health Administration
(OSHA) has specified the permissible noise level
exposures shown in the following chart. According
to OSHA, any exposure in excess of these permissible
Duration per Day
in Hours
8 90 Duo in small club
6 92
4 95 Subway train
3 97
2 100 Very loud classical music
1.5 102
1 105
0.5 110
0.25 or less 115 Loudest parts of a rock concert
Sound Level, dBA, Slow
limits could result in some hearing loss. To ensure
against potentially dangerous exposure to high
sound-pressure levels, it is recommended that all
persons exposed to equipment capable of producing
high sound-pressure levels use hearing protectors
while the equipment is in operation. Earplugs or
protectors in the ear canals or over the ears must
be worn when operating the equipment in order
to prevent permanent hearing loss if exposure is in
excess of the limits set forth here:
Typical Example
Response
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Page 5
Owner’s Manual
Overview 1
Summary of Features 1.1
1.0 Overview
Thank you for purchasing this PreSonus product.
PreSonus Audio Electronics, Inc., has manufactured
it using high-grade components to ensure
optimum performance that will last a lifetime.
The 150 mW headphone amps in the HP4 are
loud enough to explode the oysters in a Po-Boy
sandwich, yet the sound is clear and clean, with
a wide dynamic range. The HP4 is loaded with
professional features, such as a monitor output
with level control and mute and a Mono summing
switch for the headphone and monitor outputs.
1.1 Summary of Features
• 4 discrete headphone-level controls
• Mono summing switch
• Monitor level control
EnglishDeutsch EspañolFrançais
• Monitor mute switch
• 2 balanced ¼” line inputs
• Daisy-chain multiple units or pass signal to
studio monitors via monitor outputs
• 4 stereo, ¼” headphone outputs
• 2 impedance-balanced, ¼” line outputs
We encourage you to contact us with questions or
comments regarding this product. You can reach us
by email at techsupport@presonus.com or call us at
1-225-216-7887 between 9 a.m. and 5 p.m. Central
Time (GMT 05:00). PreSonus Audio Electronics is
committed to constant product improvement, and
we value your suggestions highly. We believe the
best way to achieve our goal of constant product
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1 Overview
1.1 Summary of Features
1.2 What Is In The Box
In addition to this manual, your PreSonus
package contains the following:
PreSonus HP4
improvement is by listening to the real experts: our
valued customers. We appreciate the support you
have shown us through the purchase of this product.
Please use this manual to familiarize yourself with
the features, applications, and correct connection
procedure for the HP4 before trying to connect it
to your recording system. Pay close attention when
connecting the HP4 to your system, as bad cables
and improper grounding are the most common
causes of problems encountered in recording and live
P. A. environments. We recommend checking your
cables, connections, and grounding if you experience
any noise or other sonic performance problems.
• PreSonus HP4
• 16 VAC, 1,000 mA Power Supply
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Owner’s Manual
Overview 1
What’s in the Box 1.1
2.0 Quick Start Guide
This Quick Start guide is designed to help get your
HP4 connected to your system as quickly as possible.
The following step-by-step instructions are based
on a common studio environment. Your actual setup
may change based on your needs and applications.
2.1 Getting Started
Connect the Power
1. Turn every knob on the front panel of the
2. Connect the included power supply to
Connect Your Input Sources
1. Turn down the main output volume on your
2. Connect the main outputs of your audio
3. Connect the Left and Right Monitor/Thru outputs
EnglishDeutsch EspañolFrançais
HP4 completely counterclockwise (left).
the HP4 and plug it in to a wall socket,
power strip, or surge protector.
audio interface or mixer to its lowest position.
interface or mixer to the Left and Right TRS
inputs on the back of your HP4. For the best
sound quality, PreSonus recommends us-
ing balanced cables whenever possible.
on the back of your HP4 to the inputs of your pow-
ered studio monitors or power amp (if your studio
monitors are passive). This will allow you to use a
single output pair from your audio interface or mix-
er to feed both your HP4 and your studio monitors.
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2 Quick Start Guide
2.1 Getting Started
Set Monitor Levels
Your HP4 is now ready to use!
PreSonus HP4
1. Connect a pair of headphones to the Phones 1 output.
2. Play a CD, DAW session, or other audio record-
ing that is typical of your studio productions
through your audio interface or mixer outputs.
3. Turn the main output volume of your audio interface
or mixer to unity gain. You may need to consult
the documentation that came with your device to
determine the knob or fader position for unity gain.
4. Begin turning up the Phones 1 volume knob
on the front panel of your HP4 until your head-
phones are at a comfortable listening level.
5. Begin turning up the Monitor Level knob on
the front panel of your HP4 until your studio
monitors are at a comfortable mixing level.
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Owner’s Manual
Quick Start Guide 2
Getting Started 2.1
2.2 Hookup Diagrams
2.2.1 Using the same stereo source for multiple HP4s.
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2 Quick Start Guide
2.2 Hookup Diagrams
PreSonus HP4
2.2.2 Connecting an HP4 and studio monitors to the same stereo source.
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Owner’s Manual
Quick Start Guide 2
Hookup Diagrams 2.2
3.0 Hardware
3.1 Front-Panel Layout
Headphone Volume. The HP4 has the potential
to be very loud. (It goes to 12; 11 is for wimps!)
Please be careful when you first start passing sound
through the unit. It is best to start with the volume
set at 1 and then slowly bring up the volume.
Note that the loudness of your headphones will vary depending
on their design and their input impedance. The output impedance
of the HP4 is 51Ω (ohms), and it will work fine with professional
and consumer headphones but the volume will differ depending
on which type of headphone you use. Headphones with lower
input impedances will generally be louder than higher-impedance
headphones. (In this case, louder does not mean better!) Most
professional headphones have impedances between 150Ω and
600Ω. Consumer headphones for CD players and the like often
have impedances between 8Ω and 32Ω. Broadcast headphones are
specialized, and you are unlikely to use them with an HP4; their
impedances are typically between 1.5 kΩ (kilohms) and 2 kΩ.
EnglishDeutsch EspañolFrançais
Mono button. When you press the Mono button,
each input will be summed together on each
output. For example, if you plug a CD player
into the left input, and press the Mono button,
the signal from the left input will be present in
the left and right headphone channels and in
the master output. When the Mono button is
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3 Hardware
3.1 Front Panel Layout
3.2 Back-Panel Layout
PreSonus HP4
not depressed, the left and right outputs will carry
the left- and right-channel signals, respectively.
Monitor Level. The Monitor Level knob controls
the volume of the rear-panel outputs.
Monitor Mute. The Monitor Mute button mutes
the main rear-panel outputs, which is handy when
you only want to use the front-panel headphone
outputs. This is especially helpful when recording
in front of a computer and studio monitors: you
can simply mute the signal going to the monitors
rather than turn down the Monitor Level.
Left/Right Balanced Inputs. These line-level
inputs should only be used for signals from sources
that do not require preamplification, such as CD
and MP3 players, mixers, and audio interfaces.
Left/Right Balanced Outputs (Monitor/Thru). These
are the line-level outputs for the HP4. The Monitor
Level knob on the front of the unit controls their output
level. These outputs can be used as a Monitor Thru
or to connect another HP4 for additional headphone
distribution. (See Section 2.1 for hookup diagrams.)
Power-Supply Connector. This is the
connection for the external power supply.
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Owner’s Manual
Hardware 3
Rear Panel Layout 3.2
4.0 Resources
4.1 Specifications
INPUTS:
Connector Type ¼” TRS, balanced
THD+N 0.0025%, 1 kHz, unity gain
Max Input Level +18 dBu, <0.5% THD+N, unity gain
Input Impedance 10 kΩ
Frequency Response 20 Hz - 20 kHz, ±0.5 dB
MONITOR OUTPUT:
Connector Type ¼” TRS, impedance-balanced
THD+N 0.0025%, 1 kHz, unity gain
Max Output Level +18 dBu, <0.5% THD+N
Output Impedance 51Ω
Frequency Response 20 Hz - 20 kHz, ±0.5 dB
HEADPHONE OUTPUT:
Connector Type ¼” TRS, stereo
Max Output Power 150 mW/Ch, <0.5% THD+N, 60Ω load
Frequency Response 20 Hz - 20 kHz, ±0.5 dB, 60Ω load
Headphone Impedance Working Range 32Ω – 600Ω
POWER:
External Adapter Type +12 VDC, 1000 mA, center pin positive
EnglishDeutsch EspañolFrançais
NOTE: As a commitment to constant improvement, PreSonus
Audio Electronics, Inc., reserves the right to change any
specification stated herein at any time, without notification.
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4 Resources
4.1 Specifications
4.2 Troubleshooting and Repairs
If you experience problems with your HP4,
please try the following before contacting
PreSonus Customer Support:
1. Check our Web site at www.PreSonus.com for
answers to frequently asked questions and for
troubleshooting techniques specific to the HP4.
2. Make sure your HP4 and all equipment
connected to it are powered on.
3. Disconnect/reconnect your HP4 power supply.
4. Check your connection cables and audio sources.
5. Check your headphones.
6. Isolate the problem by disconnecting any
extraneous equipment in your signal chain.
To submit a tech-support request, visit our Web site
at http://support.presonus.com/home or call us at
1-225-216-7887 between 9 a.m. and 5 p.m. Central
Time (GMT 05:00). Please note that you must register
your product at www.PreSonus.com before contacting
Customer Service. Customers outside of the United
States should check first with their regional PreSonus
distributor for technical support and repairs.
PreSonus HP4
10
When contacting technical support, please
have the following information at hand:
• A brief description of the connections
to and from your HP4.
• A description of the problem that you are encountering.
• Your HP4 serial number (located on
the bottom of the unit).
If you think that your power supply has failed, rather
Page 15
Owner’s Manual
Resources 4
Troubleshooting and Repairs 4.2
than the HP4 itself, please let the Customer
Service representative know. If your HP4 is still
under warranty, a replacement power supply will
be provided to you free of charge. If your HP4
is no longer under warranty, you may purchase
a replacement at www.PreSonus.com/store.
PreSonus Audio Electronics, Inc., warrants this
product to be free of defects in material and
workmanship for a period of one year from the
date of original retail purchase. This warranty is
enforceable only by the original retail purchaser. To
be protected by this warranty, the purchaser must
complete and return the enclosed warranty card
within 14 days of purchase. During the warranty
period PreSonus shall, at its sole and absolute
option, either repair or replace, free of charge, any
product that proves to be defective on inspection
by PreSonus or its authorized service representative.
To obtain warranty service, the purchaser must
first call or write PreSonus at the address and
telephone number printed below to obtain a Return
Authorization Number and instructions of where
to return the unit for service. All inquiries must be
accompanied by a description of the problem. All
authorized returns must be sent to the PreSonus
repair facility postage prepaid, insured, and properly
packaged. PreSonus reserves the right to update
any unit returned for repair. PreSonus reserves
the right to change or improve the design of the
product at any time without prior notice. This
warranty does not cover claims for damage due to
abuse, neglect, alteration, or attempted repair by
unauthorized personnel and is limited to failures
arising during normal use that are due to defects
in material or workmanship in the product. Any
implied warranties, including implied warranties of
merchantability and fitness for a particular purpose,
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4 Resources
4.2 Troubleshooting and Repairs
are limited in duration to the length of this limited
warranty. Some states do not allow limitations on how
long an implied warranty lasts, so the above limitation
may not apply to you. In no event will PreSonus be
liable for incidental, consequential, or other damages
resulting from the breach of any express or implied
warranty, including, among other things, damage to
property, damage based on inconvenience or on loss
of use of the product, and, to the extent permitted
by law, damages for personal injury. Some states do
not allow the exclusion of limitation of incidental or
consequential damages, so the above limitation or
exclusion may not apply to you. This warranty gives
you specific legal rights, and you may also have other
rights, which vary from state to state. This warranty
only applies to products sold and used in the United
States of America. For warranty information in all
other countries, please refer to your local distributor.
PreSonus Audio Electronics, Inc.
7257 Florida Blvd.
Baton Rouge, LA 70806 USA
www.PreSonus.com
PreSonus HP4
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Page 19
Added bonus: PreSonus’ previously
Top Secret recipe for…
Jambalaya
Ingredients:
• 5 lbs link andouille sausage
• 3 lbs boneless chicken
• 2 lbs ground beef
• 3 lbs onions (yellow or purple)
• 2 stalks of celery
• 1 lb bell peppers (green or red)
• 1 batch green onions
• 3 lbs rice
• Tony Chachere’s Cajun Seasoning
• 1 bottle chicken stock concentrate (or 3 cubes chicken bullion)
• 1 can Rotel tomatoes with chilies, diced (regular hot)
• Tabasco sauce
Cooking Instructions:
1. In a 16 qt. pot or larger, slice link sausage and pan-fry until brown.
2. Add ground beef and brown.
3. Do not remove from pot Add diced onions, celery, and bell peppers, 1 can Rotel
Original diced tomatoes w/chilies, 3 oz concentrate chicken stock, ½ teaspoon of Cajun
seasoning, 1 teaspoon of Tabasco hot sauce (or more…maybe lots more).
4. Cook until onions are translucent.
5. Add chicken and cook until it turns white.
6. Add diced green onions, 1 tsp. salt, ½ gallon water and bring to a boil.
7. Add rice and bring to a boil. Cook on high for 8 minutes, covered, stirring every 2
minutes
8. Cook covered on low for 10 minutes, stirring only once.
9. Turn off and let sit for 30 minutes.
10. Serve and enjoy!
EnglishDeutsch EspañolFrançais
Serves 20
© 2012 PreSonus Audio Electronics, Inc. All Rights Reserved. AudioBox, DigiMax, FireStudio, Nimbit, PreSonus, QMix,
StudioLive, and XMAX are trademarks or registered trademarks of PreSonus Audio Electronics, Inc. Capture, Impact, Mixverb
Presence, RedLightDist, SampleOne, Studio One, and Tricomp are trademarks or registered trademarks of PreSonus Software
Ltd. Mac, Mac OS, and Macintosh are registered trademarks of Apple, Inc., in the U.S. and other countries. Windows is a
registered trademark of Microsoft, Inc., in the U.S. and other countries. Other product names mentioned herein may be
trademarks of their respective companies. All specifications subject to change without notice...
except the recipe, which is a classic.
Page 20
HP4
Quick Start Guide
EMC Statement:
NOTE: This equipment has been tested and found to comply with the limits for a Class B digital
device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable
protection against harmful interference in a residential installation. This equipment generates,
uses, and can radiate radio frequency energy and, if not installed and used in accordance with
the instructions, may cause harmful interference to radio communications. However, there
is no guarantee that interference will not occur in a particular installation. If this equipment
does cause harmful interference to radio or television reception, which can be determined by
turning the equipment off and on, the user is encouraged to try to correct the interference by
one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and the receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver
is connected.
• Consult the dealer or an experienced radio/TV technician for help.
CAUTION: Changes or modifications to this device not expressly
approved by PreSonus Audio Electronics could void the user’s authority to operate the
equipment under FCC rules.
This apparatus does not exceed the Class A/Class B (whichever is applicable) limits for radio
noise emissions from digital apparatus as set out in the radio interference regulations of the
Canadian Department of Communications.
ATTENTION — Le présent appareil numérique n’émet pas de bruits radioélectriques
dépassant las limites applicables aux appareils numériques de class A/de class B (selon le
cas) prescrites dans le réglement sur le brouillage radioélectrique édicté par les ministere des
communications
du Canada.
7257 Florida Boulevard • Baton Rouge,
Louisiana 70806 USA • 1-225-216-7887
®
www.presonus.com
Part# 820-HP40011-B
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