Skip to product information
1 of 4

Esx Quantum Underseat Passiv Subbox Q168P

Esx Quantum Underseat Passiv Subbox Q168P

Regular price £119.99 GBP
Regular price Sale price £119.99 GBP
Sale Sold out
Tax included. Shipping calculated at checkout.

Power 100 W RMS / 200 W max. • Impedance 2 ohms
• 6x8" (15x20 cm) Woofer • Aluminum Cone
• Aluminum Housing • 1.4" / 36 mm Voice Coil
• Includes 2m Quick Connect Wire Harness

Returns Policy

We want you to be completely satisfied with your purchase from us. If for any reason you are not satisfied with your purchase, we accept returns within 14 days of purchase for a full refund in the same way you have paid for the product/s, provided the product is unopened and in a resalable condition. e.g. If you have purchased using a credit note or gift voucher, we will refund you by issuing a new credit note or gift voucher to the same value. The buyer pays for shipping.

For warranty claims, we accept them up to 2 years from the date of purchase, provided the product was purchased from us. If the product is found to be defective or faulty, we will either repair, or replace the product. If the product is no longer a current model and cannot be repaired, we will replace it with the latest version of that product. If you are not happy with the product that we replace it with, you can request a credit note to the same value to spend on our store.

To initiate a return or warranty claim, please contact us with your order details and the reason for the return or claim. We will provide you with instructions on how to proceed with the return or claim.

We reserve the right to refuse returns or warranty claims that do not meet the above criteria or are not accompanied by the necessary information.


What types of car audio products do you sell on your website? At Tender Sounds, we provide high-quality car audio products for all vehicle types including EVs, hybrids, start-stop cars, and 24v trucks. Our Musway and ESX audio products offer exceptional sound quality, made with German engineering. We also offer sound deadening materials from Vibrofiltr to reduce road noise and vibration. We're always adding new products to our inventory, so be sure to check back regularly to see what's new.

Can I trust the quality of your products? Yes, you can trust the quality of our products. Our brands, Musway and ESX, are globally recognized for their exceptional performance, durability and German engineering. They are main global sponsors of the European Mobile Media Association and have won EISA mobile entertainment awards. Leading industry magazines have also given our brands glowing reviews.

How do I know if a particular product is compatible with my car? If the product description doesn't provide enough information about compatibility with your vehicle, please feel free to send us a message with the details of the product and your vehicle. We will confirm compatibility and if you are not satisfied with your purchase, you can return it within 14 days for a refund. If you provide your VIN number to confirm compatibility, this return policy is extended to 30 days.

How can I place an order on your website? To place an order on our website, simply add the desired products to your basket and proceed to checkout. We accept debit or credit card payments, 0% finance over 3 months with Klarna, as well as payments through PayPal, Google Pay, and Apple Pay. If you encounter any issues or prefer to receive an invoice, please feel free to send us a message, and we will be happy to assist you.

What payment methods do you accept? We accept various payment methods on our website, including debit or credit cards, 0% finance over 3 months with Klarna, PayPal, Google Pay, and Apple Pay. If you encounter any issues with the payment methods or prefer to receive an invoice, please feel free to contact us, and we will be happy to assist you with alternative payment options.

What is your shipping policy? How long will it take for my order to arrive? Our shipping policy is to ensure that orders are dispatched promptly for fast and efficient delivery. Orders received before 1 pm are shipped on the same day by UPS for next day delivery. However, please note that delivery times may vary based on your location and other factors beyond our control. We will provide you with a tracking number so that you can monitor the progress of your shipment.

What is your return policy? Our refund, return and extended warranty policy can be found here:

Do you offer installation services for the car audio products purchased on your website? We at Tender Sounds Ltd are primarily an online retailer and can offer you advice on installing the equipment yourself. However, we understand that some customers may prefer professional installation services, and we can assist with this as well. We have connections to many installers who are familiar with our brands of products. If you send us a message with your location and the products you want to install, we can provide you with a competitive fixed fee quotation from a local installer. We will not charge you any extra or take any commission from the installer. If you decide to proceed with the installation, you can purchase the products from us, and we will provide you with the installation company's details. You can then arrange a date and pay directly to them for the installation.

Can you provide me with any technical support or advice for installing the car audio products I purchase from your website? Yes, we provide technical support and advice for installing the car audio products purchased from our website. We are experts in car audio and can assist you with any questions or issues you may have during the installation process. We can provide assistance via WhatsApp, where you can send us images, and we can provide step-by-step instructions or videos to help you with your technical support needs.

Do you offer any warranties or guarantees for the car audio products purchased on your website? Yes, we offer warranties and guarantees for all car audio products purchased on our website. In fact, we're pleased to offer a 2-year extended warranty on all the products we sell. You can find the full details of our warranty policy on our website If you encounter any issues with your purchase, please contact us and we'll be happy to assist you.

What sets your car audio products apart from your competitors? What sets us apart is our expertise and commitment to providing the highest quality car audio products and exceptional customer service. Our team is trained to provide technical support and advice to make your installation experience as easy as possible. We prioritize the quality of sound in your car, and our products are designed with German engineering and have won industry awards for their performance. Our DSPs are particularly noteworthy, as they are the heart of any premium installation, and we offer assistance with setting them up for a true plug-and-play experience. Overall, we are passionate about bringing you the best in-car audio experience and supporting you every step of the way.

Can you provide any customer testimonials or reviews of your products? We take pride in the satisfaction of our customers, and encourage them to share their experiences with our products on our social media pages. As a result, we do not host product reviews on our website, but we would be more than happy to provide you with links to our social media pages where you can find numerous customer testimonials and success stories.

How do I know if a product is in stock on your website? We strive to keep all of our products in stock in our UK warehouse at all times. In the rare event that we sell more in a few days than we expect to sell in a month , we will arrange for express shipping from Germany at our cost, which may add a few extra days to the delivery time. We will always contact you in this unlikely scenario to discuss alternatives we have in stock, an ETA for the extra delivery time, or offer a full refund.

What is your process for handling customer inquiries and support? You can contact Tender Sounds Ltd by sending an email to, or for the fastest response, send a WhatsApp message to 07825653062. Our normal business hours are 9-5, but if you send us a WhatsApp message, we will get back to you as soon as we are able to. We are committed to providing excellent customer support and will do our best to address any inquiries or concerns you may have.

Can you provide any recommendations for optimizing the performance of car audio products? Yes, we can absolutely provide recommendations for optimizing the performance of car audio products. As car audio experts, we know our products inside out and can preload your DSPs or DSP amplifiers before we ship them to you with a base setting to make your installation plug and play. If you want to optimize further, we can provide the technical know-how with step-by-step instructions or videos to guide you accordingly. Our team is made up of active sound quality judges in car audio competitions and can help you solve complex acoustical problems with ease. Feel free to reach out to us via email or WhatsApp, and we will be happy to assist you.

Do you offer any discounts or promotions for first-time customers or bulk orders? We strive to offer competitive pricing for all of our products, but we do not have a standard discount or promotion for first-time customers or bulk orders. However, we are always happy to work with our customers to put together custom packages based on their specific needs and budget. Additionally, we do occasionally run promotions at events we attend, such as trade shows or car audio competitions. Please feel free to contact us for more information on any current or upcoming promotions.

What is your privacy policy for handling customer data and information? Our privacy policy can be found here:

How do I track my order once it has been shipped? Once your order has been shipped, you will receive a confirmation email from us with a UPS tracking number and link to track your order. UPS provides real-time updates on the delivery status of your package, so you can check the latest information on the progress of your order. If you have any issues with tracking your package, feel free to contact us and we will be happy to assist you.

Can you provide any guides or tutorials on how to install car audio products? We offer a range of resources to help our customers install our car audio products with confidence. This includes written instructions and video tutorials, which are available by sending us a message. Additionally, we offer personalized support and technical assistance via email, phone, or WhatsApp, to ensure that you have a successful and enjoyable installation experience. Our knowledgeable team is always available to answer any questions you may have and provide guidance on optimizing the performance of your system.

What is your process for resolving any issues with orders or products? We strive to provide the best possible experience for our customers, and if any issues arise with your order or product, we encourage you to contact us as soon as possible. Our team will work with you to understand the issue and find a resolution that meets your needs. You can find more information on our policy for resolving issues in our Refund Policy, which can be found here:

Technical Support

At Tender Sounds, we take immense pride in offering outstanding technical support to ensure our customers experience a seamless journey with our products.

Our dedicated team is readily available to address any queries you may have through our email address ( or via the convenient live chat option located in the bottom corner of our homepage.

Whether you require assistance with technical specifications, product usage, optimal setup for top performance, or programming DSPs, we've got you covered.

Our average response time is a swift 1 hour, providing quick solutions to your enquiries. In rare cases of high demand, rest assured that we will respond by the following working day.

We want you to feel confident in your purchase, knowing that our comprehensive support will be there to assist you every step of the way. Your satisfaction is our priority, and we are committed to ensuring your full contentment with our products.

View full details