Radial Engineering J33 Manuel utilisateur

Radial Engineering Ltd.

1845 Kingsway Ave., Port Coquitlam, BC V3C 0H3, Canada

Tel: 604-942-1001 ●Fax: 604-942-1010

email: [email protected]

www.radialeng.com

J33™

Phono Preamp DI

User Guide

J33™User Guide

Radial Engineering Ltd.

True to the Music

www.radialeng.com

Radial J33 User Guide

Table of Contents Page

Introduction.......................................................................2

Feature Set.......................................................................2

Input Panel .......................................................................4

Output Panel.....................................................................5

Making Connections.........................................................6

FAQ ..................................................................................8

Specications ...................................................................9

Warranty ....................................................................Back Cover

Congratulations on your purchase of the Radial J33 combination

turntable preamp and direct box. This handy device has been developed

to interface a conventional turntable with magnetic cartridge to both

professional balanced audio systems and consumer unbalanced hi-

systems.

As with all Radial products, every attempt has been made to make

the J33 ‘plug & play’ easy-to-use. However, please read this manual

thoroughly to ensure the best possible results.

Should you have any questions on your new J33, please consult the

Radial website FAQ section as this is where we publish answers from

users after a product has been released. If you do not nd the answer

you are looking for on-line, please feel free to send us an email at

[email protected] and we will do our very best to get back to you

promptly.

J33™User Guide

Radial Engineering Ltd.

True to the Music

INTRODUCTION

In recent years it has become di󰀩cult to nd a hi- receiver that is

equipped with a phono input. With literally millions of albums oating

around the world, a need has emerged to capture these recordings and

transfer them to today’s digital formats.

The Radial J33 provides a solution with a simple device that is ‘plug &

play’ easy-to-use and built to Radial’s professional standards for sound

quality and durability. Equipped with an RIAA preamp and choice of

-10dB consumer line-level and pro mic-level outputs, the J33 is right at

home in the studio, on the stage and in the DJ booth.

FEATURE SET

The Radial J33 is a combination RIAA phono preamp and active DI that

allows you to connect a conventional turntable with magnetic cartridge

to a recording system, hi- or PA system.

The J33 features a pair of stereo inputs for the turntable. A ground

lug is provided to properly ground the turntable to avoid system noise.

This signal then feeds the preamp that boosts the phono signal while

introducing the RIAA equalization curve.

Next to the turntable inputs are a stereo set of RCA connectors that can

connect to the auxiliary or CD inputs on a typical hi- receiver. These

outputs can be used simultaneously with the balanced XLR outputs

described below.

The J33 is also equipped with a low-frequency rumble lter. This gently

rolls o󰀨 the bass to reduce the low frequency rumble and resonant

feedback that can occur when spinning records in high volume

environments such as on stage or in nightclubs.

To connect to professional balanced systems, the Radial J33 is

equipped with a pair of male XLR connectors. The active balanced

drivers convert the signal to a low impedance (600Ω), microphone

level, stereo signal. The J33’s balanced XLR outputs can drive turntable

signals well over 100 meters (328 feet) without appreciable loss or

noise. This makes the J33 ideal for driving turntable signals through a

snake system on stage and through the patchbays and complex wiring

systems in the professional studio.

The Radial J33 may be powered with 48V phantom or with the included

15VDC power supply. The J33 will automatically select the power

source and the two LED on the front panel will illuminate, indicating

power is present.

J33™User Guide

Radial Engineering Ltd.

True to the Music

This is the RIAA EQ curve that the J33 applies to the turntable signal. The

exact opposite curve was encoded into the signal when the vinyl LP was

pressed.

RIAA PREAMP

An RIAA phono preamp is a device that boosts the signal from

a turntable and applies a pre-dened equalization curve. The

RIAA equalization curve is applied as pre-emphasis EQ during

the cutting of the metal master, and as a de-emphasis EQ on

playback. In other words, a record is cut with the low frequencies

reduced and the high frequencies boosted (pre-emphasis),

and on playback the opposite occurs (de-emphasis). The RIAA

preamp in the J33 provides this required de-emphasis EQ.

The result is a at frequency response, but with noise such as

hiss and clicks arising from the surface of the record itself reduced

(or “attenuated”). The RIAA equalization curve has operated as

a global industry standard for the recording and playback of vinyl

records since 1954.

J33™User Guide

Radial Engineering Ltd.

True to the Music

INPUT PANEL FEATURES

1. LED power indicator

For left and right channels. Illuminates when the 15VDC power

supply is connected or when 48V phantom power is applied from a

mixing console.

2. Rumble lter

Applies a high pass lter (bass roll-o󰀨) when pushed in.

3. Gound lug

Attaches to the turntable ground wire.

4. RCA stereo output jacks

-10dB (consumer level) stereo outputs for direct connection to a

hi- receiver AUX or CD input or any device with an RCA input.

5. RCA phono (turntable) input jacks

RIAA equalized stereo input for turntable signals. Use in

conjunction with the ground lug.

4 5

J33™User Guide

Radial Engineering Ltd.

True to the Music

OUTPUT PANEL FEATURES

6. Bookend design

14 gauge steel outer shell creates protective zone around

connectors and switches and wraps around a welded case with

I-beam construction for maximum durability. Finished in tough

baked enamel.

7. Left and right XLR outputs

Balanced low impedance (600Ω) microphone level outputs.

Connects to mic input on mixing console.

8. 15VDC power supply connection

The 15VDC power supply is connected here for powering the J33.

There is no power switch and leaving the J33 on will not harm it.

This jack is not used if the J33 is powered with phantom power

from a mixing console. When switching from 48V phantom power

to the external DC supply, or back, please wait 15 seconds to

allow the RIAA amplier to charge and stabilize.

9. Full-bottom no-slip pad

This provides electrical and mechanical isolation plus plenty of

"stay-put" friction to keep the J33 in one place.

J33™User Guide

Radial Engineering Ltd.

True to the Music

MAKING CONNECTIONS

Using the Radial J33 is easy. Before connecting, start by making sure

all volume levels are set to zero and the audio system is turned o󰀨.

This will avoid any loud pops in your sound system that could cause

system damage.

Begin by connecting the turntable outputs to the J33 using the RCA

connectors and securing the ground lead from the turntable to the

ground lug on the J33.

The J33 may be powered in two ways. The rst is with 48V phantom

power from a mixing console. The second is with the J33’s external

15VDC supply. To use 48V phantom power the J33 must be connected

using its XLR connectors to a mixing console equipped with phantom

power. If your mixer is not equipped with phantom power or if you

are connecting to unbalanced systems through the J33’s RCA

connectors you will need to use the J33’s external 15VDC power

supply. Performance is identical with either power supply and the J33

will automatically select the power source depending on how you have

it set up. As soon as you connect the J33’s external 15VDC power

supply or turn on the mixers phantom power, the J33’s front panel LED

indicators will illuminate. When switching from 48V phantom power to

the external DC supply, or back, please wait 15 seconds to allow the

RIAA amplier to charge and stabilize.

Left RightGround

Detail of turntable connections showing the left and right

signal outputs and the turntable's spade ground lead.

J33™User Guide

Radial Engineering Ltd.

True to the Music

Make the connections from the J33 to whichever piece of gear you would

like. The unbalanced -10dB outputs are commonly known as consumer

line-level outputs. These will drive inputs found on hi- equipment

and the unbalanced line-level inputs found on mixing consoles. The

balanced XLR outputs on the J33's rear panel are mic-level so that they

will match up with other direct boxes and microphones, thus enabling

the J33 to be used along with microphones in snake systems, mic

splitters and through console mic preamps.

You can use any or all the output connectors at once, enabling you to,

for instance, connect your turntable to the J33, the -10dB RCA line-

level outs to a DJ mixer and the balanced XLR outs to a PA system.

Depending on how the equipment is connected to the AC mains, there

can be a potential for ground loop hum when using both the balanced

and unbalanced outputs at the same time. If a ground loop hum

develops, a possible solution is to lift the ground at the PA mixer and

use the J33’s 15VDC external power supply.

Once your connections are made, turn on the sound system. Begin at

low volume to make sure the sound system is working properly, get

your favorite album and listen. The sound should be clear. If you hear

any hum or buzz, check the ground wire, as this is the usual culprit.

It should be rmly held by the J33’s ground lug. If you are driving

your system at high volume levels and begin to hear low frequency

resonance, try depressing the rumble lter. This will usually tame low

frequency PA system feedback.

You are now ready to spin away! Have fun!

Mixing Console

DJ Mixer

Dashed line represents

turntable ground wire.

J33™User Guide

Radial Engineering Ltd.

True to the Music

FAQ

What is an RIAA pre-amp and why do I need one?

When vinyl albums are produced, a preset EQ curve is introduced. This

EQ curve is the RIAA phono response curve and has been a standard

since the introduction of the long play record or LP. The RIAA response

curve was developed to get better performance out of the medium.

When the record is played back the signal needs to be restored by

applying the exact opposite EQ curve as the one introduced during

production. This is what the RIAA preamp section of the Radial J33

is doing. Without an RIAA preamp, LPs would not sound as they were

intended to.

Can I use an active phono cartridge with the J33?

No. The J33 is designed to use magnetic cartridges which make up

99% of all turntable cartridges ever sold.

What if I depress the rumble lter and still have feedback?

Try using an isolation pad such as the Primacoustic IsoPlane

(www.primacoustic.com). This will reduce the vibration going into the

turntable and help eliminate low frequency resonant feedback.

Can I connect other devices such as keyboards or computer

sound cards to the J33's input?

No. The J33’s input is pre-equalized with the RIAA curve. This curve is

designed for LP records and would make any other source sound bad,

plus these line-level devices would overload the J33’s sensitive input

circuit and cause distortion.

Why is there no ground lift on the J33?

Because the ground lift would disconnect the pin-1 on the XLR, which

in turn would shut o󰀨 the phantom power.

Can I rackmount the J33?

Yes. The Radial J-Rak will allow as many as 8 direct boxes to be rack-

mounted in two RUs. Go to the Radial website for more details on the

J-Rak. (www.radialeng.com)

What should I do if the LEDs do not light up?

Check that the external power supply is connected or, if connecting to

a mixer through the J33's XLR outputs, make sure the 48V phantom

power has been turned on at the mixer.

How will the J33 sound with my hi- system?

Great! The J33 is a low noise preamplier and will out-perform the

typical RIAA preamp built into consumer hi- equipment.

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