Audison SR 4.300 Amplifier

--> <div class="wpb-content-wrapper"><div class="vc_row wpb_row vc_row-fluid"><div class="wpb_column vc_column_container vc_col-sm-12"><div class="vc_column-inner"><div class="wpb_wrapper"> <div class="wpb_text_column wpb_content_element" > <div class="wpb_wrapper"> <h3 class="product_title entry-title"><span style="color: #3366ff;">Audison </span>SR 4.300 Amplifier</h3> <div class="audi--product-description-paragraph"> <div class="float-start w-100 audi--product-description"> <div class="audi--product-description-paragraph truncated"> <div class="float-start w-100 audi--product-description"> <div class="audi--product-description-paragraph truncated"> <div class="audi--product-description-paragraph">After numerous listening tests with professionals and enthusiasts, Audison’s R&D team decided to adopt a new class D technology called ADT (Audison D-Class Technology) for this line of amplifiers, which has made it possible to considerably reduce their size, totally preserving the audio performance that characterises every Audison design.</div> <div></div> <div class="audi--product-description-paragraph">As far as the electronic design is concerned, every aesthetic and functional detail of the Audison SR 4.300 has been taken care of, resulting in a compact amplifier made of extruded aluminium with rounded corners, which facilitates the installation of the product in narrow spaces. Thanks to the generous heat sinks on the two short sides of the amplifiers, there is no need for internal cooling fans, which often cause noise and dust accumulation.In keeping with tradition, the SR amplifiers confirm their vocation for versatility by including on all models a complete filter section, suitable for any kind of audio system configuration.</div> <div></div> <div class="audi--product-description-paragraph">The controls, protected by a satin-finished aluminium panel, are located on the top panel of the amplifier, so that they can be easily reached from above, even after the product has been installed. When the system includes an Audison bit processor, the filter section can be totally excluded.Audison USSThanks to the integration of Audison USS (Universal Speakers Simulator) technology in the high level inputs, the SR amplifiers can also be conveniently connected to OEM sources equipped with the ‘speaker load detection’ function, which monitors the presence of a low impedance load enabling the audio outputs.Audison SR 4.300 allows multiple connectivityAll models have balanced high-level inputs for connecting to the OEM headunit speaker output and a low-level RCA for after-market speakers.</div> <div></div> <div class="audi--product-description-paragraph">When using the high-level input, the ART (Automatic Remote On/Off) function can be enabled to control the amplifiers’ power-up with the headunit’s power button. In addition, there is a remote IN / OUT socket to allow control of multiple amplifiers in cascade that turn on when needed.Through the PRE-OUT signal using the Speaker-IN socket it is possible to interface the amplifier with OEM sources that only have amplified outputs, allowing for system expansion.</div> </div> </div> </div> </div> </div> </div> </div> <div class="vc_empty_space" style="height: 32px"><span class="vc_empty_space_inner"></span></div> <div class="wpb_single_image wpb_content_element vc_align_center wpb_content_element"> <figure class="wpb_wrapper vc_figure"> <div class="vc_single_image-wrapper vc_box_border_grey"><img decoding="async" class="vc_single_image-img " src="https://www.audiofile-incar.co.uk/wp-content/uploads/2024/07/Audison_SR-4_300-R02_PANNELLO-800x500.webp" width="800" height="500" alt="Audison_SR-4_300-R02_PANNELLO" title="Audison_SR-4_300-R02_PANNELLO" loading="lazy" /></div> </figure> </div> <div class="vc_empty_space" style="height: 32px"><span class="vc_empty_space_inner"></span></div></div></div></div></div><div class="vc_row wpb_row vc_row-fluid"><div class="wpb_column vc_column_container vc_col-sm-12"><div class="vc_column-inner"><div class="wpb_wrapper"><div class="vc_empty_space" style="height: 32px"><span class="vc_empty_space_inner"></span></div></div></div></div></div><div class="vc_row wpb_row vc_row-fluid"><div class="wpb_column vc_column_container vc_col-sm-12"><div class="vc_column-inner"><div class="wpb_wrapper"><div class="vc_tta-container" data-vc-action="collapseAll"><div class="vc_general vc_tta vc_tta-accordion vc_tta-color-sky vc_tta-style-classic vc_tta-shape-rounded vc_tta-spacing-1 vc_tta-controls-align-center vc_tta-o-all-clickable"><div class="vc_tta-panels-container"><div class="vc_tta-panels"><div class="vc_tta-panel" id="1731678339268-3908876b-3c97" data-vc-content=".vc_tta-panel-body"><div class="vc_tta-panel-heading"><h4 class="vc_tta-panel-title"><a href="#1731678339268-3908876b-3c97" data-vc-accordion data-vc-container=".vc_tta-container"><span class="vc_tta-title-text">AMPLIFIER TECH DATA</span></a></h4></div><div class="vc_tta-panel-body"> <div class="wpb_text_column wpb_content_element" > <div class="wpb_wrapper"> <table class="table caption-top"> <tbody> <tr> <td>Channels</td> <td>4</td> </tr> <tr> <td>Class</td> <td>D-Class</td> </tr> <tr> <td>Hi Level Input</td> <td>Yes</td> </tr> <tr> <td>Low Level Input</td> <td>Yes</td> </tr> <tr> <td>Digital Input</td> <td>No</td> </tr> <tr> <td>Power supply voltage / fuse</td> <td>11 ÷ 15 VDC / 1 x 30A</td> </tr> <tr> <td>Operating power supply voltage</td> <td>6.5V ÷17 VDC</td> </tr> <tr> <td>Idling current</td> <td>1.6 A</td> </tr> <tr> <td>Idling current when off</td> <td>0.03 mA</td> </tr> <tr> <td>Consumption @ 14.4 VDC, 2Ω, Max Musical Power</td> <td>25 A</td> </tr> <tr> <td>Remote OUT</td> <td>6.5 ÷ 15 VDC (150 mA)</td> </tr> <tr> <td>Remote IN</td> <td>6.5 ÷ 15 VDC (1 mA)</td> </tr> <tr> <td>ART – Automatic Remote Turn on/off from OUTPUT BTL speakers (Selectable)</td> <td>1.5 ÷ 7 VDC</td> </tr> </tbody> </table> </div> </div> </div></div><div class="vc_tta-panel" id="1731678339280-69f54a1e-1809" data-vc-content=".vc_tta-panel-body"><div class="vc_tta-panel-heading"><h4 class="vc_tta-panel-title"><a href="#1731678339280-69f54a1e-1809" data-vc-accordion data-vc-container=".vc_tta-container"><span class="vc_tta-title-text">AMPLIFIER STAGE</span></a></h4></div><div class="vc_tta-panel-body"> <div class="wpb_text_column wpb_content_element" > <div class="wpb_wrapper"> <table class="table caption-top"> <tbody> <tr> <td>Distortion – THD @ 100 Hz, 4Ω, 70% Rated Power</td> <td>0.03%</td> </tr> <tr> <td>Bandwidth A</td> <td>10Hz ÷ 35 kHz</td> </tr> <tr> <td>S/N ratio A</td> <td>100 dBA</td> </tr> <tr> <td>Damping factor A</td> <td>150</td> </tr> <tr> <td>Input sensitivity Pre-In</td> <td>0.2 ÷ 5 VRMS</td> </tr> <tr> <td>Input sensitivity Speaker-In</td> <td>0.8 ÷ 20 VRMS</td> </tr> <tr> <td>Total Power RMS</td> <td>520 W</td> </tr> <tr> <td>Minimum load impedance</td> <td>@ 4Ch: 2Ω<br /> @ 3Ch: 2Ω 2Ω 4Ω<br /> @ 2Ch: 4Ω</td> </tr> <tr> <td>Output Power (RMS) @14.4 VDC, 1% THD</td> <td> <p>4Ch 85 W x 4 (4Ω) </p> <p>4Ch 130 W x 4 (2Ω)</p> <p>3Ch 80 W x 2 (4Ω) 250 W x 1 (4Ω)</p> <p>3Ch 130W x 2 (2Ω) 260 W x 1 (4Ω)</p> <p>2Ch 250 W x 2 (4Ω)</td> </tr> <tr> <td>Adjustable Crossover</td> <td>Yes</td> </tr> </tbody> </table> </div> </div> </div></div><div class="vc_tta-panel" id="1731678446080-6fc22c80-5ea1" data-vc-content=".vc_tta-panel-body"><div class="vc_tta-panel-heading"><h4 class="vc_tta-panel-title"><a href="#1731678446080-6fc22c80-5ea1" data-vc-accordion data-vc-container=".vc_tta-container"><span class="vc_tta-title-text">CEA SPECIFICATIONS</span></a></h4></div><div class="vc_tta-panel-body"> <div class="wpb_text_column wpb_content_element" > <div class="wpb_wrapper"> <table class="table caption-top"> <tbody> <tr> <td>Output power @ 4Ω, 1% THD N, 14.4 V</td> <td>Output power @ 4Ω, 1% THD N, 14.4 V: 75 W x 4 Ch</td> </tr> <tr> <td>SN ratio (ref. 1W output)</td> <td>SN ratio (ref. 1W output): 82 dBA</td> </tr> </tbody> </table> </div> </div> </div></div><div class="vc_tta-panel" id="1732808854610-2353db2a-c9df" data-vc-content=".vc_tta-panel-body"><div class="vc_tta-panel-heading"><h4 class="vc_tta-panel-title"><a href="#1732808854610-2353db2a-c9df" data-vc-accordion data-vc-container=".vc_tta-container"><span class="vc_tta-title-text">INPUTS</span></a></h4></div><div class="vc_tta-panel-body"> <div class="wpb_text_column wpb_content_element" > <div class="wpb_wrapper"> <table class="table caption-top"> <tbody> <tr> <td>Input Type</td> <td>Pre-In / Speaker-In</td> </tr> <tr> <td>Filters Outputs</td> <td>PRE OUT full range (Input A)</td> </tr> <tr> <td>Filter Pass A</td> <td>Ch Filters: – Full Hi-pass: 50 ÷ 3.2k Hz @ 12 dB/Oct.</td> </tr> <tr> <td>Filter Pass B</td> <td>Ch Filters: – Lo-pass: 50 ÷ 3.2k Hz @ 12 dB/Oct.</td> </tr> <tr> <td>Filter Pass C</td> <td>Ch Filters: – Full Hi-pass: 50 ÷ 3.2k Hz @ 12 dB/Oct.</td> </tr> <tr> <td>Filter Pass D</td> <td>Ch Filters: – Lo-pass: 50 ÷ 3.2k Hz @ 12 dB/Oct.</td> </tr> <tr> <td>Channel Mono</td> <td>A/B Ch MONO IN (on/off) Yes</td> </tr> <tr> <td>Inputs/Outputs Bass Boost</td> <td>B Ch (0 ÷12) dB</td> </tr> </tbody> </table> </div> </div> </div></div><div class="vc_tta-panel" id="1732808933437-91690c4a-20eb" data-vc-content=".vc_tta-panel-body"><div class="vc_tta-panel-heading"><h4 class="vc_tta-panel-title"><a href="#1732808933437-91690c4a-20eb" data-vc-accordion data-vc-container=".vc_tta-container"><span class="vc_tta-title-text">DIMENSIONS</span></a></h4></div><div class="vc_tta-panel-body"> <div class="wpb_text_column wpb_content_element" > <div class="wpb_wrapper"> <table class="table caption-top"> <tbody> <tr class="hz--dimensions-has-image"> <td>Dimension A</td> <td>190 mm</td> </tr> <tr class="hz--dimensions-has-image"> <td>Dimension B</td> <td>160 mm</td> </tr> <tr class="hz--dimensions-has-image"> <td>Dimension C</td> <td>155 mm</td> </tr> <tr class="hz--dimensions-has-image"> <td>Dimension D</td> <td>135 mm</td> </tr> <tr class="hz--dimensions-has-image"> <td>Dimension E</td> <td>47.5 mm</td> </tr> <tr class="hz--dimensions-has-image"> <td>Weight</td> <td>1.56 kg</td> </tr> </tbody> </table> <div> <div class="col-lg-12 col-12 audi--column-info"> <div class="table-responsive-sm"> <table class="table caption-top"> <tbody> <tr class="hz--dimensions-has-image"> <td><a class="float-start mb-5 hz-image-dimensions" href="https://static.audison.com/media/2023/06/Audison_SR_dim-33.png" data-fancybox="product_image_dimensions"><img loading="lazy" decoding="async" class="mw-30" src="https://static.audison.com/media/2023/06/Audison_SR_dim-33.png" alt="SR 4.300" width="918" height="849" /></a></td> </tr> </tbody> </table> </div> </div> </div> </div> </div> </div></div><div class="vc_tta-panel" id="1732808932985-725eb310-777f" data-vc-content=".vc_tta-panel-body"><div class="vc_tta-panel-heading"><h4 class="vc_tta-panel-title"><a href="#1732808932985-725eb310-777f" data-vc-accordion data-vc-container=".vc_tta-container"><span class="vc_tta-title-text">FEATURES</span></a></h4></div><div class="vc_tta-panel-body"> <div class="wpb_text_column wpb_content_element" > <div class="wpb_wrapper"> <ul> <li>Elegant and functional design with rounded corners to minimize space, facilitating installation.</li> <li>Built-in USS (Universal Speakers Simulator).</li> <li>Full built-in crossover section.</li> <li>Balanced high-level inputs for connecting to the OEM head unit speaker output</li> <li>Low-level RCA for after-market speakers.</li> <li>ART (Automatic Remote On/Off) function.</li> <li>Remote IN / OUT socket to allow control of multiple amplifiers.</li> <li>PRE-OUT allows for system expansion.</li> </ul> </div> </div> </div></div></div></div></div></div></div></div></div></div><div class="vc_row wpb_row vc_row-fluid"><div class="wpb_column vc_column_container vc_col-sm-12"><div class="vc_column-inner"><div class="wpb_wrapper"><div class="vc_empty_space" style="height: 32px"><span class="vc_empty_space_inner"></span></div></div></div></div></div><div class="vc_row wpb_row vc_row-fluid"><div class="wpb_column vc_column_container vc_col-sm-12"><div class="vc_column-inner"><div class="wpb_wrapper"><div class="vc_empty_space" style="height: 32px"><span class="vc_empty_space_inner"></span></div></div></div></div></div><div class="vc_row wpb_row vc_row-fluid"><div class="wpb_column vc_column_container vc_col-sm-6"><div class="vc_column-inner"><div class="wpb_wrapper"> <div class="wpb_single_image wpb_content_element vc_align_left wpb_content_element"> <figure class="wpb_wrapper vc_figure"> <div class="vc_single_image-wrapper vc_box_border_grey"><img loading="lazy" decoding="async" width="300" height="131" src="https://www.audiofile-incar.co.uk/wp-content/uploads/2024/08/audison_adt_low-300x131.webp" class="vc_single_image-img attachment-medium" alt="" title="audison_adt_low" srcset="https://www.audiofile-incar.co.uk/wp-content/uploads/2024/08/audison_adt_low-300x131.webp 300w, https://www.audiofile-incar.co.uk/wp-content/uploads/2024/08/audison_adt_low-768x336.webp 768w, https://www.audiofile-incar.co.uk/wp-content/uploads/2024/08/audison_adt_low-433x189.webp 433w, https://www.audiofile-incar.co.uk/wp-content/uploads/2024/08/audison_adt_low-937x409.webp 937w, https://www.audiofile-incar.co.uk/wp-content/uploads/2024/08/audison_adt_low.webp 1000w" sizes="auto, (max-width: 300px) 100vw, 300px" /></div> </figure> </div> <div class="vc_empty_space" style="height: 32px"><span class="vc_empty_space_inner"></span></div> <div class="wpb_text_column wpb_content_element" > <div class="wpb_wrapper"> <div class="float-start w-100 audi--headline-technologies"> <div class="float-start w-100 audi--description-technologies audi--color-grey"> <div class="float-start w-100 audi--headline-technologies"><strong>Audison D-Class technology</strong></div> <div class="float-start w-100 audi--description-technologies audi--color-grey"> <p>ADT uses a switching frequency twice as fast as many other modern Class D amplifiers using very high-tolerance component parts to keep the timing correct even during temperature extremes. The higher switching frequency of Audison Class D moves noise much farther away from the audible band. Audison Class D amplifiers also use a steeper 4th-order analog lowpass filter, rather than the simpler 2nd-order lowpass filters usually used in competing designs. The steeper filter will keep noise much lower in amplitude – which is good for controlling EMI and preventing infrasonic noise from getting to the tweeters. It also keeps phase shift outside the audible range. The cost is higher – twice as many components are needed for a 4th-order filter compared to the usual 2nd-order filter, and each output channel needs its own filter – but Audison determined through exhaustive listening testing that this design was the best-sounding approach.</p> </div> </div> </div> <div class="float-start w-100 audi--description-technologies audi--color-grey"> <p> </p> </div> </div> </div> <div class="vc_empty_space" style="height: 32px"><span class="vc_empty_space_inner"></span></div><div class="vc_btn3-container vc_btn3-center vc_do_btn" ><a class="vc_general vc_btn3 vc_btn3-size-md vc_btn3-shape-rounded vc_btn3-style-3d vc_btn3-color-sky" href="http://audiofile-incar.co.uk/wp-content/uploads/2024/07/AUDISON_SR_1500_Tech_Sheet-1.pdf" title="">Tech Sheet</a></div></div></div></div><div class="wpb_column vc_column_container vc_col-sm-6"><div class="vc_column-inner"><div class="wpb_wrapper"> <div class="wpb_single_image wpb_content_element vc_align_left wpb_content_element"> <figure class="wpb_wrapper vc_figure"> <div class="vc_single_image-wrapper vc_box_border_grey"><img loading="lazy" decoding="async" width="300" height="100" src="https://www.audiofile-incar.co.uk/wp-content/uploads/2024/08/audison_All_Channels_Driven-300x100.webp" class="vc_single_image-img attachment-medium" alt="" title="audison_All_Channels_Driven" srcset="https://www.audiofile-incar.co.uk/wp-content/uploads/2024/08/audison_All_Channels_Driven-300x100.webp 300w, https://www.audiofile-incar.co.uk/wp-content/uploads/2024/08/audison_All_Channels_Driven-768x255.webp 768w, https://www.audiofile-incar.co.uk/wp-content/uploads/2024/08/audison_All_Channels_Driven-433x144.webp 433w, https://www.audiofile-incar.co.uk/wp-content/uploads/2024/08/audison_All_Channels_Driven-937x311.webp 937w, https://www.audiofile-incar.co.uk/wp-content/uploads/2024/08/audison_All_Channels_Driven.webp 1000w" sizes="auto, (max-width: 300px) 100vw, 300px" /></div> </figure> </div> <div class="vc_empty_space" style="height: 32px"><span class="vc_empty_space_inner"></span></div> <div class="wpb_text_column wpb_content_element" > <div class="wpb_wrapper"> <div class="float-start w-100 audi--headline-technologies"> <div class="float-start w-100 audi--description-technologies audi--color-grey"> <div class="float-start w-100 audi--description-technologies audi--color-grey"> <p>The “All Channels Driven” design philosophy guarantees that the Audison amplifier delivers the rated power on all channels simultaneously. To reach that target, Audison designed the amplifier power supply to handle the cumulative power demand.</p> </div> </div> </div> <div class="float-start w-100 audi--description-technologies audi--color-grey"> <p> </p> </div> </div> </div> <div class="vc_empty_space" style="height: 32px"><span class="vc_empty_space_inner"></span></div> <div class="wpb_single_image wpb_content_element vc_align_left wpb_content_element"> <figure class="wpb_wrapper vc_figure"> <div class="vc_single_image-wrapper vc_box_border_grey"><img loading="lazy" decoding="async" width="300" height="132" src="https://www.audiofile-incar.co.uk/wp-content/uploads/2024/08/Uss-1-300x132-1.webp" class="vc_single_image-img attachment-medium" alt="" title="Uss-1-300x132" /></div> </figure> </div> <div class="wpb_text_column wpb_content_element" > <div class="wpb_wrapper"> <div class="float-start w-100 audi--headline-technologies"> <div class="float-start w-100 audi--description-technologies audi--color-grey"> <div class="float-start w-100 audi--description-technologies audi--color-grey"> <p>Universal Speaker Simulator technology on high-level inputs for maximum compatibility with any type of Head-Unit OEM Source.</p> </div> </div> </div> <div class="float-start w-100 audi--description-technologies audi--color-grey"> <p> </p> </div> </div> </div> <div class="vc_empty_space" style="height: 32px"><span class="vc_empty_space_inner"></span></div> <div class="wpb_single_image wpb_content_element vc_align_left wpb_content_element"> <figure class="wpb_wrapper vc_figure"> <div class="vc_single_image-wrapper vc_box_border_grey"><img loading="lazy" decoding="async" width="300" height="100" src="https://www.audiofile-incar.co.uk/wp-content/uploads/2024/08/audison_Fully_bridgeable_low-300x100.webp" class="vc_single_image-img attachment-medium" alt="" title="audison_Fully_bridgeable_low" srcset="https://www.audiofile-incar.co.uk/wp-content/uploads/2024/08/audison_Fully_bridgeable_low-300x100.webp 300w, https://www.audiofile-incar.co.uk/wp-content/uploads/2024/08/audison_Fully_bridgeable_low-768x255.webp 768w, https://www.audiofile-incar.co.uk/wp-content/uploads/2024/08/audison_Fully_bridgeable_low-433x144.webp 433w, https://www.audiofile-incar.co.uk/wp-content/uploads/2024/08/audison_Fully_bridgeable_low-937x311.webp 937w, https://www.audiofile-incar.co.uk/wp-content/uploads/2024/08/audison_Fully_bridgeable_low.webp 1000w" sizes="auto, (max-width: 300px) 100vw, 300px" /></div> </figure> </div> <div class="wpb_text_column wpb_content_element" > <div class="wpb_wrapper"> <div class="float-start w-100 audi--headline-technologies"> <div class="float-start w-100 audi--description-technologies audi--color-grey"> <div class="float-start w-100 audi--description-technologies audi--color-grey"> <p>Maximum versatility thanks to the bridging option for each pair of channels.</p> </div> </div> </div> <div class="float-start w-100 audi--description-technologies audi--color-grey"> <p> </p> </div> </div> </div> </div></div></div></div> </div><!-- Audison SR 4.300 Amplifier After numerous listening tests with professionals and enthusiasts, Audison’s R&D team decided to adopt a new class D technology called ADT (Audison D-Class Technology) for this line of amplifiers, which has made it possible to considerably reduce their size, totally preserving the audio performance that characterises every Audison design. As far as the electronic design is concerned, every aesthetic and functional detail of the Audison SR 4.300 has been taken care of, resulting in a compact amplifier made of extruded aluminium with rounded corners, which facilitates the installation of the product in narrow spaces. Thanks to the generous heat sinks on the two short sides of the amplifiers, there is no need for internal cooling fans, which often cause noise and dust accumulation.In keeping with tradition, the SR amplifiers confirm their vocation for versatility by including on all models a complete filter section, suitable for any kind of audio system configuration. The controls, protected by a satin-finished aluminium panel, are located on the top panel of the amplifier, so that they can be easily reached from above, even after the product has been installed. When the system includes an Audison bit processor, the filter section can be totally excluded.Audison USSThanks to the integration of Audison USS (Universal Speakers Simulator) technology in the high level inputs, the SR amplifiers can also be conveniently connected to OEM sources equipped with the ‘speaker load detection’ function, which monitors the presence of a low impedance load enabling the audio outputs.Audison SR 4.300 allows multiple connectivityAll models have balanced high-level inputs for connecting to the OEM headunit speaker output and a low-level RCA for after-market speakers. When using the high-level input, the ART (Automatic Remote On/Off) function can be enabled to control the amplifiers’ power-up with the headunit’s power button. In addition, there is a remote IN / OUT socket to allow control of multiple amplifiers in cascade that turn on when needed.Through the PRE-OUT signal using the Speaker-IN socket it is possible to interface the amplifier with OEM sources that only have amplified outputs, allowing for system expansion. AMPLIFIER TECH DATA Channels 4 Class D-Class Hi Level Input Yes Low Level Input Yes Digital Input No Power supply voltage / fuse 11 ÷ 15 VDC / 1 x 30A Operating power supply voltage 6.5V ÷17 VDC Idling current 1.6 A Idling current when off 0.03 mA Consumption @ 14.4 VDC, 2Ω, Max Musical Power 25 A Remote OUT 6.5 ÷ 15 VDC (150 mA) Remote IN 6.5 ÷ 15 VDC (1 mA) ART – Automatic Remote Turn on/off from OUTPUT BTL speakers (Selectable) 1.5 ÷ 7 VDC AMPLIFIER STAGE Distortion – THD @ 100 Hz, 4Ω, 70% Rated Power 0.03% Bandwidth A 10Hz ÷ 35 kHz S/N ratio A 100 dBA Damping factor A 150 Input sensitivity Pre-In 0.2 ÷ 5 VRMS Input sensitivity Speaker-In 0.8 ÷ 20 VRMS Total Power RMS 520 W Minimum load impedance @ 4Ch: 2Ω @ 3Ch: 2Ω 2Ω 4Ω @ 2Ch: 4Ω Output Power (RMS) @14.4 VDC, 1% THD 4Ch 85 W x 4 (4Ω)  4Ch 130 W x 4 (2Ω) 3Ch 80 W x 2 (4Ω) 250 W x 1 (4Ω) 3Ch 130W x 2 (2Ω) 260 W x 1 (4Ω) 2Ch 250 W x 2 (4Ω) Adjustable Crossover Yes CEA SPECIFICATIONS Output power @ 4Ω, 1% THD N, 14.4 V Output power @ 4Ω, 1% THD N, 14.4 V: 75 W x 4 Ch SN ratio (ref. 1W output) SN ratio (ref. 1W output): 82 dBA INPUTS Input Type Pre-In / Speaker-In Filters Outputs PRE OUT full range (Input A) Filter Pass A Ch Filters: – Full Hi-pass: 50 ÷ 3.2k Hz @ 12 dB/Oct. Filter Pass B Ch Filters: – Lo-pass: 50 ÷ 3.2k Hz @ 12 dB/Oct. Filter Pass C Ch Filters: – Full Hi-pass: 50 ÷ 3.2k Hz @ 12 dB/Oct. Filter Pass D Ch Filters: – Lo-pass: 50 ÷ 3.2k Hz @ 12 dB/Oct. Channel Mono A/B Ch MONO IN (on/off) Yes Inputs/Outputs Bass Boost B Ch (0 ÷12) dB DIMENSIONS Dimension A 190 mm Dimension B 160 mm Dimension C 155 mm Dimension D 135 mm Dimension E 47.5 mm Weight 1.56 kg FEATURES Elegant and functional design with rounded corners to minimize space, facilitating installation. Built-in USS (Universal Speakers Simulator). Full built-in crossover section. Balanced high-level inputs for connecting to the OEM head unit speaker output Low-level RCA for after-market speakers. ART (Automatic Remote On/Off) function. Remote IN / OUT socket to allow control of multiple amplifiers. PRE-OUT allows for system expansion. Audison D-Class technology ADT uses a switching frequency twice as fast as many other modern Class D amplifiers using very high-tolerance component parts to keep the timing correct even during temperature extremes. The higher switching frequency of Audison Class D moves noise much farther away from the audible band. Audison Class D amplifiers also use a steeper 4th-order analog lowpass filter, rather than the simpler 2nd-order lowpass filters usually used in competing designs. The steeper filter will keep noise much lower in amplitude – which is good for controlling EMI and preventing infrasonic noise from getting to the tweeters. It also keeps phase shift outside the audible range. The cost is higher – twice as many components are needed for a 4th-order filter compared to the usual 2nd-order filter, and each output channel needs its own filter – but Audison determined through exhaustive listening testing that this design was the best-sounding approach.   Tech Sheet The “All Channels Driven” design philosophy guarantees that the Audison amplifier delivers the rated power on all channels simultaneously. To reach that target, Audison designed the amplifier power supply to handle the cumulative power demand.   Universal Speaker Simulator technology on high-level inputs for maximum compatibility with any type of Head-Unit OEM Source.   Maximum versatility thanks to the bridging option for each pair of channels.