3. Amplifier for beginners
  5. SA4.500

SA4.500

SA4.500

Technical Highlights

  • 125 W power per channel at 2 Ω, 4 channels, max current consumption 50 A.
  • Continuously adjustable high-pass filter 30–5000 Hz, low-pass up to 20,000 Hz.
  • Micro-housing measures 121 × 81 × 43 mm, MOSFET technology, THD 1.0 %.
  • More technical details
€159.00
€159.00 €159.00
2% discount with credit card

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ProductSA4.500

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DD Audio-SA4.500-4-Kanal Verstärker-masori-kaufen
€159.00
€159.00 €159.00

The SA4.500 from DD Audio is a 4-channel Amplifier equipped with a compact micro housing, allowing for space-saving installation in vehicles. It offers a power output of 125 W per channel at 2 Ω and features continuously adjustable high-pass and low-pass filters that allow for individual adjustments to various speaker setups. The housing measures 121 × 81 × 43 mm, enabling flexible placement under seats or in other hidden areas. The SA4.500 is also equipped with high-level inputs that allow for direct connection to OEM radios or modern head units, even without RCA output. The robust MOSFET technology ensures reliable operation and low distortion even during prolonged use.

Features

  • Compact micro housing with dimensions of 121 × 81 × 43 mm
  • 125 W power output per channel at 2 Ω
  • Continuously adjustable high-pass and low-pass filters
  • Integrated high-level inputs for easy retrofitting
  • Robust MOSFET technology for reliable operation

Technical Specifications

  • Channels 4
  • Operating voltage 9–16 V
  • RMS power @ 4 Ω 4 × 75 W / 2 × 250 W bridged
  • RMS power @ 2 Ω 4 × 125 W
  • Max. current draw 50 A
  • Damping factor 100
  • THD 1.0 %
  • Frequency response 20–20,000 Hz
  • High-pass filter 30–5000 Hz
  • Low-pass filter 40–20,000 Hz
  • Power connection up to 10 mm²
  • Speaker connection up to 1.5 mm²
  • Dimensions (mm) 121 × 81 × 43
  • High-level to RCA adapter included

Frequently Asked Questions about SA4.500

How can the SA4.500 be operated in 4-ohm mode and what advantages arise from the wide frequency response?

The 4-ohm operation provides you with a solid balance of sound precision and effective power delivery in a 4-channel car amplifier. With this model, you get 75 W RMS per channel, which is sufficient for many speaker setups to produce rich mids and clear highs. Thanks to the frequency response of 20 to 20,000 Hz, the amplifier easily covers a wide range, allowing you to accurately address both deep bass and fine highs. Additionally, the continuously adjustable high-pass and low-pass filters enable precise frequency adjustments to optimally tune various speaker systems. This way, you benefit from versatile design and can fine-tune your sound experience at any time. The stable MOSFET design keeps the distortion (THD) at a maximum of 1.0%, ensuring that audible distortions remain low.

How does bridging to 2 channels work, and what power can be expected?

The SA4.500 supports bridging two channels, providing you with increased output power on two instead of four amplifier channels. In this mode, you can expect 250 W RMS per channel at 4 Ω load, which offers sufficient power for subwoofers or particularly power-hungry speakers. Merging two channels increases the voltage peaks and ensures a strong output signal, allowing you to achieve high levels. However, you should pay attention to stable speaker drivers, as the higher power can cause more thermal stress. Additionally, the frequency response remains broad at 20–20,000 Hz, allowing for finely tuned playback even in bridged operation. In some cases, too low resistance can increase the current load, which is why adequate wiring with up to 10 mm² cross-section is important.

What advantages does the SA4.500 offer with the continuously adjustable filters, and how can you optimally tune these for high-pass and low-pass?

The continuously adjustable filters of a 4-channel amplifier allow you to precisely adapt to various speaker configurations. The high-pass filter covers a range from 30 to 5000 Hz, which is ideal for protecting smaller speakers from excessive low-frequency levels and driving them more efficiently. At the same time, the low-pass filter with a range between 40 and 20,000 Hz ensures flexible integration of subwoofers or larger midrange drivers. By gradually adjusting the crossover frequencies, you can shape the sound image and minimize tonal overlaps. This helps you balance level jumps and keep the frequency response of your overall system as linear as possible, without unintentionally amplifying distortions. Especially at higher levels, correct filter tuning ensures clean mids and confident bass.

How can Hi-Level inputs be used when using an original radio without RCA outputs?

The SA4.500 features integrated Hi-Level inputs that allow you to connect directly to factory radio outputs or head units without traditional RCA outputs. These inputs convert the speaker signal from your original radio to a level that the amplifier can process optimally. This eliminates the need for additional converters or adapters, promoting compact wiring inside the vehicle. The signal remains clean, allowing you to take full advantage of a 4-channel amplifier. Even with higher input signals, the MOSFET design proves robust and minimizes distortions. Additionally, the included high-level to RCA solution offers more flexibility should you decide to switch to another source device and require higher power. For consistent signal transmission, a power connection of up to 10 mm² is also recommended to ensure the amplifier can operate unhindered.

Can the SA4.500 be mounted under the seat, and how practical is the compact design for hidden installations?

A micro housing with dimensions of 121 × 81 × 43 mm is excellent for placing the amplifier in small spaces or behind panels. Especially when you want to integrate the amplifier discreetly, the low height is particularly useful, as it can often be easily accommodated under the seat or in other tight spots. This keeps your interior tidy, and you don't have to make significant compromises on sound quality. At the same time, the compact design allows you to configure electrical connections more easily when needed, as you can achieve shorter cable runs. This keeps heat development manageable, and the device can be operated stably.

What is the power requirement of a 4-channel amplifier and what power supply is recommended?

The SA4.500 can draw up to 50 A of current, which is due to its overall high output power across four channels. A supply voltage of 9 to 16 V gives you enough flexibility for different vehicle electronics. For example, if you are in a car with a 12-V electrical system, the amplifier ensures that it operates stably even with occasional voltage fluctuations. For optimal power supply, you should use a sufficiently sized cable that offers up to about 10 mm² cross-section. This way, you can minimize voltage losses and achieve maximum efficiency. Additionally, you benefit from reliable signal transmission, allowing dynamic music levels to be reproduced accurately. This keeps the power supply stable even under high load.

What are the damping factor and THD of the SA4.500, and why are these parameters relevant for sound quality?

A damping factor of 100 in a 4-channel car amplifier means that the internal output resistance of the power stage remains very low. This allows the speaker membranes to be controlled more precisely, which is particularly important for tight bass reproduction in the low-frequency range. So if you enjoy pressure in the lower frequency spectrum, this damping factor contributes to defined contouring. A maximum total harmonic distortion (THD) of 1.0% indicates that distortions remain moderate even at higher volumes. Thus, important sonic details in the mid and high frequency ranges are preserved. For a homogeneous sound image, a low distortion is advantageous, as it allows you to reproduce various musical content without disturbing artifacts. This significantly contributes to a clear definition across the entire frequency spectrum.

Can a 4-channel amplifier be operated with 2-ohm speakers and what RMS power will be obtained?

The SA4.500 is designed for operation with 2-ohm speakers and can provide 125 W RMS per channel, giving you significantly more headroom for high volumes. If you prefer subwoofers or front systems with low impedance, the additional power increase helps create strong level reserves. At the same time, the stable MOSFET concept ensures low distortion, even when you are working closer to the power limit. However, a proper power supply is essential to prevent current load from causing voltage drops. Therefore, pay attention to high-quality power and ground cables up to 10 mm². This way, you benefit from a consistent power supply and can effortlessly reproduce dynamic musical passages. This allows you to unleash the full potential of your drivers.

How do the RMS power ratings at 4 Ω and 2 Ω compare for the SA4.500, and when is a bridged connection worthwhile?

In a 4-channel amplifier, you get an RMS power of 75 W per channel at 4 Ω, which is sufficient for most conventional speakers and allows for detailed mids and clean highs. However, if you switch to 2 Ω, the power increases to 125 W per channel, giving you more sound pressure and stronger level reserves. A bridged connection is particularly beneficial if you want to drive a subwoofer or particularly power-hungry drivers, as you can get a solid 250 W per channel in bridged mode at 4 Ω load. This allows you to tailor the amplifier to your system configuration as needed and achieve powerful results. This way, you benefit from flexible use in various systems.

What setup tips are there for installing a 4-channel amplifier to ensure clean wiring and optimal signal quality?

When installing the SA4.500, it is advisable to route the signal and power cables separately to minimize electromagnetic interference. Make sure to choose a suitable ground point to prevent voltage fluctuations from affecting sound quality. Additionally, the speaker wires should not be pinched, as they only have a storage capacity of up to 1.5 mm². If you cleverly place the compact housing of 121 × 81 × 43 mm, you can reduce heat development and vibrations. Also, ensure that you set the high-pass and low-pass filters correctly before heavily loading the system. This way, your car audio experience will be more direct, without unwanted frequency components. Since the power supply can handle voltages from 9 to 16 V, slight fluctuations in the onboard network are not problematic.

Manufacturer information/responsible person

Audio Import Group
Pekka Kinnunen
Palkkitie 10
84100 Ylivieska
Finland

Contact: info@audioimport.fi

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