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The J+4™ is a stereo interface designed to accept unbalanced low output devices such as instruments, computers or mobile devices and boost their signal to a balanced +4dB level for connection to professional audio recording and playback equipment.
The J+4 allows you to boost nearly any stereo signal up to a +4dB balanced line level output, which can be sent over long distances without signal loss and connected directly to pro audio equipment such as mixers or recording interfaces. Multiple input connectors are available for integration with a variety of devices, including a stacked set of ¼" jacks for DJ mixers or keyboards, RCAs for CD players and a mini 3.5mm jack for smartphones and tablets. The J+4 delivers exceptional sonic performance, and is able to provide clean gain and eliminate noise by combining the advantages of active signal buffering with transformer isolation.
Increasing the output from a CD player to a +4dB balanced signal is easy. Just plug into the RCA inputs, adjust the volume level and the J+4 does all the work. Transformer isolation eliminates ground loops for quiet performance every time.
Today, computers and laptops are being used in all types of audio-visual systems. The J+4 makes it easy to interface with a built-in 3.5mm (1/8") TRS jack. Plug in and the J+4 will boost and balance the signal and deliver a professional line level signal.
Many keyboards and synthesizers do not have enough output to effectively drive the line level input on a mixer. This is particularly troublesome on older keyboards such as a Rhodes piano. The J+4 makes it easy with built-in ¼" inputs and balanced XLR outs.
Justin Timberlake, Rolling Stones, Jay-Z, Led Zeppelin, Foreigner, AC/DC
"The Radial J+4 sounds great, is well built and practical. It seems like somebody actually thought about making a good product and then actually did... Great stuff!"
City & Colour, Arkells, Lights
"I’ve been using Radial products for over ten years because they sound fantastic and the build quality is top notch. There are very few times during a recording/mix session or a live show when I don’t have a piece of Radial gear in the chain."
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Orders placed though the Amber Technology website are despatched from our Sydney warehouse. Orders placed before 1.00pm Sydney time (for items in stock) will generally be shipped on the same day.
We ship using Startrack Express. We deliver Australia-wide to residential, business and PO box addresses.
Shipping is free for all orders over $275 including GST (effective 1 March 2018). There is a $22 (including GST) shipping and handling charge for all orders under $275 including GST.
You can track your shipment through the web sites of our couriers:
Star Track Express
Tracking numbers for your order can be found in the order history section of your dashboard. If you have any questions regarding shipping, please contact us.
Our goods come with guarantees that cannot be excluded under the Australian Consumer Law. You are entitled to a replacement or refund for a major failure and compensation for any other reasonably foreseeable loss or damage. You are also entitled to have the goods repaired or replaced if the goods fail to be of acceptable quality and the failure does not amount to a major failure.
All items purchased from Amber Technology will be covered under warranty. The duration and terms of this warranty are specified by the manufacturer unless otherwise stated. Warranty information is available on the individual product listings on this site.
Refurbished items will include a 12 month warranty unless otherwise stated.Please contact us if you have received an item which has been damaged in transit or is otherwise not working correctly when you receive it. Subject to availability, we will arrange for a replacement item to be despatched and for the faulty item to be returned to us.
Amber Technology maintains a nation-wide network of carefully selected Authorised Service Agents to ensure that you are never far from convenient, expert technical and service support. If your item develops a problem and requires servicing under warranty, please contact your local Authorised Service Agent.
The availability of stock is communicated via the indicator of each product listing page. "Available" means that reasonable stock is in our warehouse, ready for immediate shipment. "Limited Stock" means that we have only a small number of items in stock. "Out of Stock" means this item is currently unavailable for immediate shipment - orders placed for ‘Out of Stock’ items will be fulfilled as soon as replacement stock arrives.
"Special Order” items are products that are not generally kept in stock in Australia. Lead times for Special Order items vary depending on country of origin, manufacturer’s stock levels, factory production schedules and/or incoming shipment transit times. Please contact us for an estimate as to the likely lead time. Please note that finalized sales for special order items cannot be cancelled.
If refurbished stock is available, this will be shown on the summary page for the product. If a product listing only allows you to choose refurbished stock, we are not holding new stock and we can no longer obtain new stock.
Refurbished items are always in perfect working order and will include all accessories. Refurbished items are may
Refurbished items include a 12-Month warranty unless otherwise stated.
Please visit the Get Support page to find a service agent, log a service ticket, or ask a technical question about your product.
Please contact us if you have received an item which has been damaged in transit or is otherwise not working correctly when you receive it. Subject to availability, we will arrange for a replacement item to be despatched and for the faulty item to be returned to us.