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Radial J+4 2-channel Signal Level Driver Certified Open Box

Signal Driver with Level Matching from -10dB to +4dB
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Item ID: JPlus4Stereod1
Radial J+4 2-channel Signal Level Driver

Certified Open Box Savings!

Save $29 What is Certified Open Box?

The price below reflects your savings.

Price:$260 and 99 cents
Savings: $29.00

New for $289.99

Condition Notes:

This item is in great condition and perfect working order. Product includes all original accessories. This item ships in its original factory packaging.

This item was thoroughly inspected by our factory-authorized service team and is backed by Sweetwater's exclusive 2-year warranty. The images shown do not necessarily represent the condition of this particular item.

$44.00 suggested monthly payments with 6 month financing‡ 36 month financing available* with $399.00 minimum purchase on one invoice.

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Radial J+4 2-channel Signal Level Driver
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Your Swiss Army Knife for Level Matching

If you interface pro audio with low-level devices - instruments, MP3 players, computers, etc. - you need the Radial J+4. The J+4 takes incoming signals as low as 10dB and boosts them up to +4 for use in professional audio environments such as recording and broadcast studios or live touring. The J+4's 100% discrete circuitry ensures optimal signal integrity, while its active signal buffering and transformer isolation virtually eliminate noise. The simple control set includes a stereo gain control, a highpass filter, and a ground lift. For flexibility, J+4 is fitted with dual 1/4" and RCA jacks, and an 1/8" stereo TRS input.

Built Radial tough

Like every Radial product, the J+4 is designed tour-tough. At Sweetwater, we expect nothing less from Radial. Its roadworthy 14-gauge steel I-beam inner frame protects the vulnerable PC board, while the unique book-end outside shell puts the controls, switches, and connectors in a protective zone. The bottom is covered in a non-slip pad for superior electrical and mechanical isolation. With its high headroom, ultra-low-noise performance, rock-solid dependability, and amazing versatility, you'll find the Radial J+4 to be indispensable.

Radial J+4 Balanced -10dB to +4dB Signal Driver Features:
  • Increases gain of low-output instruments, computers, and music players
  • Onboard stereo preamp boosts low-level signals to +4dB line level
  • Transformer isolation eliminates noise due to ground loops
  • Generous connectivity:
    • 2 x 1/4" jacks
    • 2 RCA jacks
    • 1/8" stereo TRS
  • S/N ratio: greater than 95dB
Solve your level-matching problems with the Radial J+4!
What is Certified Open Box Gear?

At Sweetwater, we're so picky that what we call "Certified Open Box" is actually better than what most music retailers sell as "new" gear! Our gear hasn't endured hundreds of people a week plunking away at all the keyboards, fumbling through Stairway to Heaven on every guitar or playing with every fader and knob on a mixer or control surface.

Certified Open Box (also known as a demo) means we’ve had it out of the box for our YouTube channel, displayed at events, tested in our studio, or maybe it was in a customer’s hands for a few days and isn’t ‘factory fresh’ as a result. Every Certified Open Box item we sell has Sweetwater’s 2-year Total Confidence Coverage™ warranty and has been tested and verified up to ‘new’ specs by our factory-authorized technicians to make sure it’s in perfect working order before we ship it to you.

When you buy a Certified Open Box item at Sweetwater, you get:
  • 2-year Total Confidence Coverage Warranty™!
  • Products inspected and tested by our factory-authorized techs, guaranteed to function like new (or better)!
  • FREE shipping on most items
  • Equipment that will MEET or EXCEED your expectations!

Click HERE to browse our current inventory of Certified Open Box equipment. Purchasing Certified Open Box gear from Sweetwater is a smart and safe way to save!

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Warranty Info

Sweetwater's FREE 2-Year Total Confidence Coverage Warranty

Extra peace of mind at no extra cost.

  • Save money with FREE parts and labor
  • Get back to making music with the industry's fastest turnaround time
  • Fix it the first time with our award-winning, factory-certified Service Department
Learn More about Total Confidence Coverage
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Tech Specs

  • Type: Stereo Preamplifier
  • Channels: 2
  • Ground Lift: Yes
  • Outputs: 2 x XLR
  • Analog Inputs: 2 x 1/4", 2 x RCA, 1 x 1/8"
  • Power Supply: 15V DC power supply (included)
  • Height: 2"
  • Width: 3.3"
  • Depth: 5"
  • Weight: 1.55 lbs.
  • Manufacturer Part Number: R800 8015

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Reviews

Radial J+4 2-channel Signal Level Driver
It gives a good signal boost to the speakers. It can be used with phono connectors, 1/4 inch, and XLR connectors. It can be used with balanced or unbalanced lines. I use this on my speakers. I recommend this product.
Radial J+4 2-channel Signal Level Driver
This signal driver gave me a clean sound. There wasn't any hum noise. It boosted my audio signal and did not have to drive the audio signal on the mixer above a normal operating level. I had plenty of signal gain without ring and feedback. This unit doesn't take up much space. This I like. I appreciate this recommendation.
Radial J+4 2-channel signal level driver
I needed to boost a -10dB signal up to +4dB to match a TASCAM product to my Alesis 9600 input. Also, the output from the TASCAM was Hi Z unbalanced and the Alesis had Lo Z balanced inputs. The Radial J+4 worked perfectly. And, like all Radial products, it is built like a tank, rugged, well designed and practical. I can recommend this and all the other Radial products without reservation.
It worked
It did what I wanted. I was able to boost weak signals coming from built DI/line outs on two amps and bring them in to a mixing board as balanced signals. Adds a lot of wires to our set up but makes sound check go a lot faster.
Yes!
I am running a yamaha P515 piano into a set of studio monitors and the output on the piano is unbalanced. So the J4 changes the unbalanced signal to a balanced signal plus gives me plenty of gain to crank up the volume! A regular passive DI box would not work for me...