SOUNDIMPRESS HY252-4CH Quad Amplifier User Manual

: June 13, 2024
: SOUNDIMPRESS

Table of Contents

SOUNDIMPRESS HY252-4CH Quad Amplifier
Product Information
Product Usage Instructions
SAFETY INSTRUCTIONS
WARRANTY TERMS
DISPLAY OF CONTROL FUNCTIONS
GET STARTED
SPECIFICATIONS
Documents / Resources
- Read User Manual Online (PDF format)
- Download This Manual (PDF format)

SOUNDIMPRESS HY252-4CH Quad Amplifier

Product Information

The HY252-4CH Quad is a high-end class-D four-channel amplifier designed for various audio applications, including public address systems and ultra-high- fidelity replay systems for studio and home use. It is part of the SoundImpress brand, known for its exceptional quality, timeless designs, and Dutch craftsmanship. The amplifier is extensively tested and manually assembled to ensure every detail is checked for optimum performance and durability.

Key Features

Self-contained high-end class-D four-channel amplifier
Small and powerful
Authoritative and tightly controlled low registers
High dynamics and crystal clear mid- and high-frequencies
Super-low noise level for a black background and detailed sound reproduction
Hand-assembled in the Netherlands
Custom-milled aluminum enclosure
Hypex NC252MP amplifier module
High-quality binding posts from CMC
XLR-chassis from Neutrik
Wiring from Mogami and Belden
Universal mains input compatibility (110-230 VAC)
Flat frequency response irrespective of load impedance
Nearly frequency-independent distortion behavior
Low-radiated and conducted EMI
The max output power of 250 Wrms at 4 ohms per channel
Signal-to-Noise Ratio (SNR) of 121 dB
Distorting level of 0.0015%
Switched-mode power supply (SMPS) for efficient and regulated power delivery

Product Usage Instructions

Safety Instructions

Make sure to follow these safety requirements and heed all warnings and safety instructions:

Before cleaning, unplug the amplifier from the electrical outlet. Use a damp cloth for cleaning; do not use liquid or aerosol cleaners.
Ensure proper ventilation by not blocking or covering the slots and openings in the casing. Avoid placing the product on a bed, sofa mat, or any surface that could block ventilation. If placing the product in an enclosed space like a bookcase or shelf, ensure proper ventilation or follow the manufacturer’s instructions.

SoundImpress HY252-4CH Quad
250WPC | Ncore® | Powered by Hypex

This SoundImpress amplifier is a self-contained high-end class-D four-channel amplifier intended for a wide range of audio applications, ranging from public address systems to ultrahigh-fidelity replay systems for studio and home use. The SoundImpress brand stands for outstanding quality, timeless designs, and Dutch craftsmanship. This amplifier is built to last as it is extensively tested and manually assembled to ensure every last detail is checked.

Ncore® technology
Impressive performance despite the load
High-quality aluminum chassis
Compact design
Dimmable LED
XLR input, binding posts output
Assembled by hand in the Netherlands
5-year Warranty

SoundImpress HY252 Quad Amplifier 250WPC | Ncore® | Powered by Hypex

The HY252-4CH is a compact, high-performance, four-channel and no-nonsense class-D power amplifier. It incorporates the proven and renown Hypex Ncore® technology for nothing less than impressive performance!
The performance stands out with authoritative and tightly controlled low registers, high dynamics and crystal clear mid- and high-frequencies. The super-low noise level generates a completely black background to reveal the tiniest of details in every recording.
All SoundImpress amplifiers are hand assembled in the Netherlands. The custom-milled aluminum enclosure houses the Hypex NC252MP amplifier module, the best thermal material for audio devices. The in- and output connections are provided through high-quality binding posts from CMC and XLR-chassis from Neutrik and wiring from Mogami and Belden. It can operate from both 110 and 230 VAC mains voltage due to it’s universal mains input compatibility featuring an automatic input voltage doubler.

Small and powerful

This amplifier can deliver all its power from as low as 2 ohm impedance combined with low idle loss, very low distortion and noise levels. Chief distinguishing features are flat frequency response irrespective of load impedance, nearly frequency independent distortion behavior and very low radiated and conducted EMI. Tthis results in performances such as the max output power of 250 Wrms at 4 ohm per channel, a Signal-to-Noise Ratio (SNR) of 121 dB and astonishing distorting level of 0.0015%.
An amplifier is only as good as the power supply it contains. In this SoundImpress amplifier, the power supply and amplifier are located on one board. The switched-mode power supply (SMPS) providing the power for the amplifier is a compact, high power, highly efficient, regulated half bridge converter with synchronous rectification on the main output rails. These properties make this technology ideal for powering class-D audio amplifiers.

SAFETY INSTRUCTIONS

SAVE THESE SAFETY REQUIREMENTS FOR FUTURE REFERENCE. HEED ALL WARNINGS AND SAFETY REQUIREMENTS MARKED IN THIS MANUAL AND ON THE AMPLIFIER.

CLEANING – Unplug this product from the electrical outlet before cleaning. Do not use liquid cleaners or aerosol cleaners. Use a damp cloth for cleaning.
VENTILATION – Slots and openings in the casing serve for ventilation and reliable operation of the product. They also protect the product from overheating. These openings must not be blocked or covered. These openings should never be blocked by placing the product on a bed, sofa mat or the like. Also, this product should not be placed in an enclosed space such as a bookcase or shelf unless proper ventilation is provided or the manufacturer’s instructions are carefully followed.
POWER SOURCES – This product should be connected only to the power source indicated on the label. If you are not sure which power source is used in your home, contact the dealer or the local power company. The best way to disconnect the amplifier from power supply is to remove the power plug from the outlet. Unplug the power cord from the outlet if the unit will not be used for several months or longer.
OVERLOADING – Ensure that outlets, extension cords, and built-in additional connections are not overloaded as this may result in fire or electric shock.
OBJECTS AND LIQUIDS – Never push objects of any kind into this product as they may touch dangerous voltage points or short-circuit which may result in fire or electric shock. Never spill liquid on this product.
WARNING: Do not expose this amplifier to water, spills or splashes and do not place objects filled with liquids, such as vases, on the device. As with all electronic products, take care not to spill liquids into any part of the system. Liquids can cause malfunction and/or cause a fire.

WARRANTY TERMS

LIMITED WARRANTY – Sound Imports warrants this device for a period of five years after the original date of purchase against defects due to faulty workmanship or materials arising from Normal Use of the device. The warranty covers working parts that affect the function of the device. It does NOT cover cosmetic deterioration caused by fair wear and tear, or damage caused by accident, misuse or neglect. Any attempt to modify or take apart the device (or its accessories) will void the warranty.
If you discover a defect, notify SoundImports during the warranty period. Claims under warranty must be supported by reasonable evidence that the date of the claim is within the warranty period. To validate your warranty, please keep your original purchase receipt together with these warranty conditions for the duration of the warranty period. Replacement products claimed under warranty are not entitled to renewed 5-year warranty coverage.
If you discover a defect, notify SoundImports during the warranty period. Claims under warranty must be supported by reasonable evidence that the date of the claim is within the warranty period. To validate your warranty, please keep your original purchase receipt together with these warranty conditions for the duration of the warranty period. Replacement products claimed under warranty are not entitled to renewed 5-year warranty coverage.
SUPPORT – We are continuously working to enhance your experience with our products. If you have any comments, remarks or have found a defect, please contact us. If you have any problems with your amplifier please check this user manual. If this manual is not sufficient to troubleshoot your problem contact SoundImports support department. The latest datasheets and manuals can be found on our website. If you can’t find the answer there, you can also contact us and we will be happy to help!

DISPLAY OF CONTROL FUNCTIONS

Channel output (+)
Channel output (-)
Balanced input
On / off switch
Power input ‘
Fuse tray “

Attention: Risk of electric shock.
The fuse is supplied as standard. When replacing it, only use the original value.

DISPLAY OF CONTROL FUNCTIONS

Front panel with engraved logo
Dimmable LED indicator
Bottom view
Switch for LED indicator ‘

See the next page for an explanation of the LED switch.

DISPLAY OF CONTROL FUNCTIONS

LED OFF
Normal brightness
Max brightness

GET STARTED

START – Before turning on your new amplifier, first make all connections. Ensure that the volume on your pre-amplifier or playback device is set to a minimum.
CONNECTION – The HY252-4CH has four sets of speaker connections. Connect the speaker terminals marked “+” and “-” to the corresponding “+” and “-“ terminals of your designated speaker. Repeat the same for the other speaker terminals and corresponding speaker.
This amplifier will work with both balanced and unbalanced inputs.
For single-ended sources you can use a RCA to XLR cable or converter plug. The cable or converter should short signal ground (XLR pin 1) with negative signal input (XLR pin 3).
PLAY – Turn on the amplifier. Slowly increase the volume while playing some
music.

ENJOY!

SPECIFICATIONS

Rated power output (RMS)| 2 x 250 watts at 4 ohms

2 x 150 watts at 8 ohms

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Minimum load| 4 ohm
Signal-to-noise ratio (SNR)| 121 dB
Distortion| 0.0015 % THD+N (20-20,000 Hz at 0.5 x rated

power output)

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SoundImports
Peizerweg 97A
9727AJ Groningen
Nederland
Tel: +3185-0711860
E-mail:info@soundimports.nl
Btw-nummer: NL861325254B01
KvK-nummer: 78268753