HPm - Receiver SPL - Free user manual and instructions

Product Type	Headphone Monitoring Amplifier (500 Series Module)
Brand	SPL
Model	HPm
Dimensions (Approx.)	76 x 133 x 152 mm (3" x 5.25" x 6")
Weight	1.76 lbs (0.8 kg)
Power Supply	Powered by 500 Series rack
Frequency Range (-3 dB)	10 Hz – 100 kHz
Common Mode Rejection (1 kHz, 0 dBu)	>82 dB
THD + N (0 dBu, 10 Hz – 22 kHz)	0.03%
Noise (A-weighted)	-92.3 dBu
Dynamic Range	113 dB
Input Impedance (Balanced)	10 kΩ
Output Impedance (Balanced)	150 Ω
Max Output Power (600 Ω)	+18 dBu
Max Output Power (300 Ω)	+15 dBu
Max Output Power (32 Ω)	+5 dBu
Headphone Outputs	2 x 1/4" (6.35 mm) TRS Jack
Phonitor Matrix	Crossfeed, Speaker Angle (20° / 30° / 40°), Center Level (-0.5 / -1.0 / -1.5 dB)
Phase Inversion	Left or right channel invertible (180°)
Stereo / Mono / Mute	Switchable
Volume Controls	Separate pots for Headphone Amp 1 and 2
Cleaning	Dry cloth, no solvents or acids
Safety	Do not open; avoid water, fire, lightning; qualified service only
Spare Parts & Repairability	No user-serviceable parts; contact qualified professional
Environmental Compliance	WEEE-Reg.-No. 973 349 88; dispose according to EU Directive 2012/19/EU

Frequently Asked Questions - HPm SPL

How do I install the HPm module into a 500 Series rack?

Ensure the rack is switched off and unplugged. Insert the module into two adjacent slots, align connectors, press firmly, and tighten screws. Then connect audio cables and headphones before powering on.

What is the Phonitor Matrix and how does it work?

The Phonitor Matrix emulates the acoustic crossfeed, speaker angle, and center level of a stereo speaker setup for headphone listening. It includes Crossfeed, Speaker Angle (20°/30°/40°), and Center Level attenuation (-0.5/-1.0/-1.5 dB).

Can I use the HPm with any 500 Series rack?

Yes, the HPm is a standard 500 Series double-slot module and is compatible with any 500 Series rack that provides power and audio connections.

What type of headphones are supported?

The HPm has two 1/4'' (6.35 mm) TRS headphone outputs. It can drive headphones of various impedances, with maximum output power specified for 600 Ω (+18 dBu), 300 Ω (+15 dBu), and 32 Ω (+5 dBu).

How do I adjust the crossfeed effect?

Use the Crossfeed control knob (continuously adjustable). It blends a portion of the opposite channel into each headphone to simulate natural speaker crossfeed.

What does the Phase ∅ switch do?

The phase inversion switch inverts the phase of either the left or right channel by 180°. It is useful for troubleshooting phase issues in the audio signal.

How to clean the HPm module?

Disconnect the rack from power before cleaning. Use a dry cloth only. Do not use solvents, acids, or abrasive cleaners as they may damage the finish.

What should I do if there is no sound from the headphones?

Check that the Mute switch is not engaged. Ensure the Matrix is on if desired, and the volume pots are turned up. Also verify that the rack is powered and audio is present at the inputs.

What are the safety precautions I must follow?

Do not open the module; it contains no user-serviceable parts. Avoid exposure to water, excessive dust, extreme temperatures, and flammable items. Disconnect during thunderstorms. Always power down the rack before installation or removal.

What is the warranty and environmental disposal policy?

The product complies with CE standards. For disposal, do not discard with household waste. Follow EU Directive 2012/19/EU for recycling electrical and electronic equipment. Contact local authorities for proper disposal.

USER MANUAL HPm SPL

HPm

Headphone Monitoring Amplifier

Headphone monitoring amplifier with Phonitor Matrix for two headphones as 500 Series module

Introduction

Developer

Bastian Neu

Version 2.0 - 12/2022

This manual contains a description of the product. In no way it represents a guarantee of particular characteristics or results of use. The information in this document has been carefully compiled and verified and, unless otherwise stated or agreed upon, correctly describes the product.

Specifications are subject to change without notice.

Specifications

General

Frequency range (-3 dB): 10 Hz – 100 kHz

Common mode rejection (1 kHz, 0 dBu): >82 dB

THD + N (0 dBu, 10 Hz – 22 kHz): 0.03%

Noise (A-weighted): -92.3 dBu

Dynamic range: 113 dB

Input & Output (balanced)

Input impedance: 10 kΩ

Output Impedance: 150 Ω

Headphone Outputs, 1/4" (6,35 mm) TRS Jacks

Max output power (600 Ω) +18 dBu

Max output power (300 Ω) +15 dBu

Max output power (32 Ω) +5 dBu

Scope of Delivery

HPm module, 500 Series

Manual

Measurement & Weight

Double-slot module, 500 Series

Weight: 1.76 lbs (0.8 kg)

Please keep the original packaging. In a service case the original packaging ensures a safe transport.

Installation

Installation into a 500 Series rack:

• Please read the manual that comes with the 500 Series rack. You should receive all necessary information for the installation process.
• For the installation or exchange of HPm, your 500 Series rack should be switched off and the power cable should not be connected.
• Insert the HPm module into two adjacent free slots of your rack. Make sure the connectors of the HPm is precisely aligned with the rack connectors.
• Press the HPm module carefully into the rack connectors and tighten the screws.
• Connect the HPm module with your audio environment using the connections from your 500 Series rack.
• Connect Headphones.
• Insert the power cable to the 500 Series rack and switch it on.

Control Elements

Phase ∅

With the phase inversion switch the phase the of the left or right channel can be inverted (180°).

Stereo/Mono/Mute

The audio signal can be switched between stereo and mono. In the Mute position, the headphone outputs are muted.

Crossfeed

The Crossfeed parameter of the HPm is continuously adjustable via the crossfeed control.

Matrix On/Off

With the Matrix switch, the Phonitor Matrix (Crossfeed, Speaker Angle, Center Level) can be activated or deactivated.

Speaker Angle

The Angle parameter can be adjusted in three settings: 20^ , 30^ and 40^ . The studio standard is 30^ .

Center Level

To make the listening experience even more perfect, the level of the center of the stereo image needs to be attenuated when the Phonitor Matrix is active. This ensures that not only the position of all sound sources is correct but also their volume. With HPm, this parameter, which we call “Center” in the Phonitor Matrix, can also be adjusted in three settings. You can choose between an attenuation of -0.5dB, -1 dB or -1.5 dB. The standard for an authentic representation of the stereo image is -1 dB.

HEADPHONE AMP 1

With the Volume poti for the HEADPHONE AMP 1 the volume for headphone 1 can be adjusted.

HEADPHONE AMP 2

With the Volume poti for the HEADPHONE AMP 2 the volume for headphone 2 can be adjusted.

Security Advices

Before starting up the device:

• Read thoroughly and follow the security advices.
• Read thoroughly and follow the manual.
• Observe all warning instructions on the device ad on your 500 Series rack.
• Please keep the user manual as well as the security advices in a safe place for future reference.
• Module installation and replacement should only be carried out by qualified technicians.
• Please refer to and heed the safety and assembly instructions of your 500 series rack.

Warning

Always follow the security advices listed below to avoid serious injuries or even deadly accidents due to electric shocks, short circuit, fire or other dangers. The following are examples of such risks and do not represent an exhaustive list:

Do not open

This device contains no user-serviceable parts. Do not open the device or attempt to disassemble the internal parts or modify them in any way. If it should appear to be malfunctioning, turn off the power of your 500 Series rack immediately, unplug the power cord from the mains socket outlet and have it inspected by a qualified professional.

Water warning

Do not expose the device to rain, or use it near water or in damp or wet conditions, or place anything on it (such as vases, bottles or glasses) containing liquids which might spill into any openings. If any liquid such as water seeps into the device, turn off the power of your 500 Series rack immediately and unplug the power cord from the mains socket outlet. Then have the device inspected by a qualified professional.

Fire warning

Do not put burning items, such as candles, on the unit. A burning item may fall over and cause a fire.

Lightning

Before thunderstorms or other severe weather, disconnect your 500 Series rack from the mains socket outlet; do not do this during a storm in order to avoid life threatening lightning strikes. Similarly, disconnect all the power connections of other devices, antenna and phone/network cables which may be interconnected so that no damage results from such secondary connections.

If you notice any abnormality

When one of the following problems occur, immediately turn off the power switch and disconnect the electric plug of your 500 Series rack from the mains socket outlet. Then have the device inspected by a qualified professional.

• The device emits unusual smells or smoke.
• An object has fallen into the unit.
• There is a sudden loss of sound during the use of the device.

Caution

Always follow the basic precautions listed below to avoid the possibility of physical injury to you or others, or damage to the device or other property. These precautions include, but are not limited to, the following:

Location

Do not place the device in a location where it may come into contact with corrosive gases or salty air. This may result in malfunction.

Before moving the device, remove all connected cables.

Connections

Before connecting the device to other devices, power down all devices. Before power on or off the devices, set all volume levels to minimum.

Only use appropriate cables to connect the device with other devices. Make sure that the cables you use are intact and comply with the electrical specifications of the connection. Other connections can lead to health risks and damage the equipment.

Handling

Operate the controls and switches only as described in the manual. Incorrect adjustments outside safe para meters can lead to damage.

Never use excessive force on the switches or controls.

Do not insert your fingers or hands in any gaps or openings of the device.

Avoid inserting or dropping foreign objects (paper, plastic, metal, etc.) into any gaps or openings of the device. If this happens, power down immediately and unplug the power cord from the mains socket outlet. Then have the device inspected by a qualified professional.

Do not expose the device to excessive dust or vibrations or extreme cold or heat (such as direct sunlight, near a heater or in a car during the day) to prevent the possibility of causing damage to the housing, the internal components or unstable operation.

If the ambient temperature of the device suddenly changes, condensation can occur (if for example the device is relocated or is affected by a heater or air conditioning).

Using the device while condensation is present may result in malfunction. Do not power on the device for a few hours until the condensation is gone. Only then it is safe to power on.

Cleaning

Disconnect the device from your mains socket outlet before cleaning.

Do not use any solvents, as these can damage the chassis finish. Use a dry cloth, if necessary, with an acid-free cleaning oil.

Disclaimer

The company names and product names in this manual are the trademarks or registered trademarks of their respective companies.

SPL and the SPL Logo are registered trademarks of SPL electronics GmbH.

SPL cannot be held responsible for damage caused by improper use or modification of the device or data that is lost or destroyed.

Notes on Environmental Protection

At the end of its operating life, this product must not be disposed with regular household waste but must be returned to a collection point for the recycling of electrical and electronic equipment.

The wheelie bin symbol on the product, user manual and packaging indicates that.

For proper treatment, recovery and recycling of old products, please take them to applicable collection points in accordance with your national legislation and the Directives 2012/19/EU.

The materials can be reused in accordance with their markings. Through reuse, recycling of raw materials, or other forms of recycling of old products, you are making an important contribution to the protection of our environment.

Your local administrative office can advise you of the responsible waste disposal point.

This directive only applies to countries inside the EU. If you wish to discard devices outside the EU, please contact your local authorities or dealer and ask for the correct method of disposal.

WEEE-Reg-No.: 973 349 88

Support & Contact

help.spl.audio

SPL electronics GmbH

Sohlweg 80

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© 2022 SPL electronics GmbH

This manual/document is protected by copyright. All rights, technical modifications and printing errors reserved.

Copying, reproduction, translation or conversion into any electronic medium or machine-readable form in whole or in part is only permitted with the express written consent of SPL electronics GmbH.

Declaration of CE Conformity

The construction of this unit is in compliance with the standards and regulations of the European Community.

HPm

© 2022 SPL electronics GmbH