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Free standard shipping on orders over £50
Superfast Next Day Delivery available
You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
We are proud to present the renovated SR 4.500 (130 W x 4 @ 4Ω) introduced back in 1988 and constantly updated with the best technologies available.
Class D amplifiers are also called “switching amplifiers”, since their efficiencies are arrived at by rapid on and off switching of the output transistors. Audison Class D uses a much higher switching frequency than most other amplifiers. You might think the switching frequency for all Class D amps are the same, but Class D chipsets allow significant latitude in many design aspects, such as switching frequency and timing. Most companies use as low a switching frequency as possible - this makes the timing easier to manage, and allows the use of lower-precision components which cost less. ACD uses a switching frequency twice as fast as many other modern Class D amplifiers. Higher switching frequencies require incredibly precise timing, which require higher-tolerance components to be used in order to keep the timing pulses from overlapping (that causes catastrophic failure of the output transistor). Audison uses very high-tolerance component parts to keep the timing correct even during temperature extremes (temperature changes shift the values of analog components). To Audison, this is worth the cost, since the higher switching frequency of Audison Class D moves noise much farther away from the audible band.
Audison Class D also uses 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 for preventing infrasonic noise 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.
CEA SPECIFICATION
Free Standard Delivery on all orders over: £50.00 (Excludes Northern Ireland, Channel Islands and International Orders)
UK Next Working Day Delivery with DPD: Need your order urgently? Take advantage of our next working day delivery option by placing your order before 16:00. This excludes Northern Ireland, Scottish Highlands and Channel Islands (Sorry!)
Saturday Delivery Option with DPD: Choose our Saturday delivery option during checkout for seamless and convenient weekend delivery, ensuring your needs are met precisely when you need them. This excludes Northern Ireland, Scottish Highlands and Channel Islands (Sorry!)
We are dedicated to providing exceptional service and convenience, ensuring swift and efficient delivery of your products. Benefit from our various delivery options tailored to meet your specific preferences and requirements.
Hassle-free Returns: At HR Car Audio, we strive for your satisfaction. If you are not completely satisfied with your purchase, we offer a straightforward 14-Day Money Back Guarantee. Simply return any unused and unopened products within 14 days of delivery for a full refund.
Easy Return Process: To initiate a return, please ensure the product is in its original, unused condition and contact our customer service team. We will guide you through the simple return process and ensure a prompt refund.
Customer Satisfaction Priority: We place a strong emphasis on customer satisfaction and aim to make the return and refund process as convenient as possible for you. Your feedback is valuable to us, and we are dedicated to resolving any concerns promptly and efficiently.
Shop with confidence at Car Audio Centre, knowing that our 14-Day Money Back Guarantee ensures a hassle-free return process for your convenience and peace of mind.
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By placing an order with HR Car Audio, you agree to abide by the following terms and conditions. These terms are intended to ensure that you are aware of our policies and procedures and that your rights are protected.
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