Audison SR 4.500 4-Channel Class-D Amplifier

Introducing the revamped Audison SR 4.500 (130 W X 4 @ 4Ω) 4-Channel Class-D Amplifier, first released in 1988 and continuously upgraded with cutting-edge technologies.

The Audison team in Potenza Picena, Italy carefully designed and perfected the new SR line, utilizing cutting-edge amplification technology. After extensive listening tests with professionals and enthusiasts, the R&D team chose to integrate ADT (Audison D-Class Technology) into the entire range, resulting in smaller amplifiers without sacrificing audio performance.

EDGELESS DESIGN
The Audison design team has meticulously crafted this amplifier with both aesthetics and functionality in mind. Its extruded aluminum construction, complete with rounded corners, allows for easy installation even in tight spaces. With ample heat sinks on both short sides, there is no need for internal cooling fans that can often lead to noise and dust issues.

COMPLETE CONTROLS ON UPPER PANEL
The SR amplifiers continue to demonstrate their versatility, featuring a comprehensive filter section on all models that can adapt to any type of audio system setup. The controls, protected by a sleek aluminum panel, are conveniently located on the upper panel of the amplifier for easy access even after installation. In combination with an Audison bit processor, the filter section can be completely bypassed.

 
Utilizing Audison USS technology, the SR amplifiers can easily connect to OEM sources with "speaker load detection" to enable audio outputs thanks to the high-level inputs. The dynamic load circuit known as USS presents a low impedance load to the OEM output channel and then introduces a higher load, ensuring compatibility with Class D outputs while minimizing current and heat issues.

LIMITLESS CONNECTIVITY

All Audison SR4.500 4-Channel Class-D Amplifiers come with high-level balanced inputs designed to connect to both OEM Head Unit speakers output and after-market speakers through low RCA level connections. The ART function (Automatic Remote Turn-On / Off) can be enabled when using high level inputs, allowing control of the amplifiers with the head unit's switch-on button. Additionally, a remote IN / OUT socket is included to control cascading amplifiers' switch-on button. The SR 1.500, SR 4.300 and 4.500 models also feature a Speaker-IN input that can recreate the PRE-OUT signal, making it possible to expand the system using OEM sources with amplified outputs.

POWER SUPPLY

• Power supply voltage / fuse 11 ÷ 15 VDC / 2 x 25A
• Operating power supply voltage 6.5 ÷17 VDC
• Idling current 1.7 A
• Idling current when off 0.09 mA
• Consumption @ 14.4 VDC, 2Ω, Max Musical
• Power 40 A
• Remote IN 6.5 ÷ 15 VDC (1 mA)
• Remote OUT 6.5 ÷ 15 VDC (150 mA)
• ART - Automatic Remote Turn on/off from
• OUTPUT BTL speakers (Selectable) 1.5 ÷ 7 VDC

AMPLIFIER STAGE

• Distortion - THD @ 1 kHz, 4Ω, 70% Rated Power 0.08 %
• Damping factor @ 1 kHz, 4Ω, 2 VRMS 200
• Bandwidth @ -1.5 dB 10 Hz ÷ 35 kHz
• S/N ratio (A weighted @ 1 V Input) 105 dBA
• Pre-In sensitivity 0.2 ÷ 5 VRMS
• Speaker-In sensitivity 0.8 ÷ 20 VRMS
• Minimum load impedance
• @4Ch: 2Ω
• @ 3Ch: 2Ω + 2Ω + 4Ω
• @ 2Ch: 4Ω

OUTPUT POWER (RMS) @14.4 VDC, 1% THD:

• 4Ch 130 W x 4 (4Ω)
• 4Ch 220 W x 4 (2Ω)
• 3Ch 120 W x 2 (4Ω) + 480 W x 1 (4Ω)
• 3Ch 220 W x 2 (2Ω) + 440 W x 1 (4Ω)
• 2Ch 450 W x 2 (4Ω)
• INPUTS / OUTPUTS
• Inputs Pre-In / Speaker-In
• Outputs PRE OUT full range (Input A)
• Front Ch Filters:
• Full
• Hi-pass: 50 ÷ 3.2k Hz @ 12 dB/Oct.
• Lo-pass: 50 ÷ 3.2k Hz @ 12 dB/Oct.
• Rear Ch Filters:
• Full
• Hi-pass: 50 ÷ 3.2k Hz @ 12 dB/Oct.
• Lo-pass: 50 ÷ 3.2k Hz @ 12 dB/Oct.
• A/B Ch MONO IN (on/off) Yes
• Bass Boost 50Hz (adjustable) B Ch (0 ÷12) dB

SIZE

•  W x H x D : 10.39" x 6.10" x 1.87"