Radial Engineering J33 Manual de usuario

Radial Engineering

1638 Kebet Way, Port Coquitlam BC V3C 5W9

Tel: 604-942-1001 Fax: 604-942-1010

email: [email protected]

www.radialeng.com

Radial Engineering is a division of C•TEC (JP CableTek Electronics Ltd.)

J33

Phono Preamp DI

User Guide

Radial is a division of JP Cabletek Electronics Ltd.

Speciﬁcations and appearence subject to change without notice.

Radial J33 manual V1.0 - Part #: R870-1090-00

www.radialeng.com

Radial J33 Phono Preamp DI Users Guide

Table of Contents Page

Introduction 2

Feature Set 3

Input panel 4

Output panel 5

Making Connections 6

FAQ 7

Speciﬁcations 9

Warranty Back cover

J33 User Guide

True to the Music

Radial Engineering

WELCOME

Congratulations on your purchase of the Radial J33 combination

phono preamp and turntable direct box. This handy device has

been developed to interface a conventional turntable with mag-

netic cartridge to a recording, hi-ﬁ or PA system using the XLR

microphone input on a mixer or preamp.

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

make using 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 con-

sult the Radial website FAQ section as this is where we publish

answers from users after a product has been released. If you do

not ﬁnd 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.

Now dust off that old Perry Como Christmas record, pour your-

self some eggnog and enjoy!

True to the Music

J33 User Guide

Radial Engineering

INTRODUCTION

Since the advent of the compact disc, the use of long-playing

records has become so sparse that it has become difﬁcult to

ﬁnd a hi-ﬁ receiver that is equipped with a phono input. With

literally millions of albums ﬂoating 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 stan-

dards for sound quality and durability. Equipped with an RIAA

preamp and choice of -10dB consumer line-level and pro 600-

Ohm mic-level outputs, the J33 is right at home in the studio, on

the stage and in the DJ booth.

For the enterprising studio, this opens the door to a new busi-

ness opportunity: a phono to CD transfer service that will allow

families to enjoy their favorite CD’s in their cars and on their

new surround sound systems. The Radial J33 also boasts other

advantages: for the broadcast station and museum, old record

collections can now be easily archived by transferring old phono

recordings to digital media. With the plethora of digital ‘noise-

eliminating’ software, less than ideal recordings can now be

updated to approach today’s signal-to-noise expectations.

For the recording studio, the emergence of ‘scratching’ in hip-

hop, rap and pop music opens the door to better recordings and

more creativity by allowing a turntable to connect through high-

end processing, opening up opportunities for re-recording and

greater artistic freedom.

RIAA PREAMP

The Radial J33 is a combination RIAA phono preamp and active

direct box that allows you to connect a conventional turntable

with magnetic cartridge to a recording system, hi-ﬁ or PA sys-

tem.

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

a turntable and applies a pre-deﬁned 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 frequen-

cies 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 ﬂat frequency response, but with noise such

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

reduced (or “attenuated”). The other main beneﬁt of the RIAA

system is longer playback times. The RIAA equalization curve

has operated as a global industry standard for the recording and

playback of vinyl records since 1954.

True to the Music

Radial Engineering J33 User Guide

FEATURE SET

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 RIAA preamp that

boosts the phono signal while introducing the RIAA equalization

curve.

Next to the turntable inputs are a series of unbalanced -10dB

consumer line-level outputs. These include a stereo set of RCA

connectors that can connect to the auxiliary or CD inputs on a

typical hi-ﬁ receiver; a 1/8” (3.5mm) stereo mini-jack that can

connect to an MP3 player or computer sound card and a ¼” TRS

connector for a stereo feed that can be split using an insert cable

to a pair of line inputs on a PA or DJ mixer.

The J33 is also equipped with a low-frequency rumble ﬁlter. This

gently rolls off the bass at 200Hz and is -3dB at 100Hz to reduce

the low frequency rumble and feedback that can often 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 bal-

anced drivers, shown in the block diagram, convert the signal

to a low impedance (600ohm), 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 patch bays and complex

wiring systems that abound 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 illumi-

nate, indicating power is present.

RIAA RESPONSE CURVE

True to the Music

Radial Engineering J33 User Guide

INPUT PANEL FEATURES

1. LED power indicator

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

supply is connected or when phantom power is applied from

a mixing console.

2. Rumble ﬁlter

Applies a high pass ﬁlter when pushed in.

3. Gound lug

Attatch the turntable ground lug here.

4. 3.5mm stereo output (thru-put)

Paralleled stereo output for direct connection to computer

sound cards, laptops or any device with a 3.5mm input.

5. 1/4" phono stereo output (thru-put)

Paralleled stereo output for direct connection to a local

mixer, recorder or any device with a 1/4" TRS input.

6. RCA stereo output (thru-put)

Paralleled stereo outputs for direct connection to a local

mixer, recorder or any device with a RCA input.

7. RCA stereo input

Stereo input connectors for turntable signals. Use in con-

junction with the gound lug.

6 7

51 432

True to the Music

Radial Engineering J33 User Guide

OUTPUT PANEL FEATURES

8. Bookend design

14 gauge steel outer shell creates protected zone around

connectors and switches and wraps around a welded case

with I-beam construction for maximum durability. Finished in

tough baked enamel.

9. Left and right XLR outputs

Balanced and low impedance (600Ω) microphone level

output. Connect to sound system inputs or main mixing

console.

10. 15V DC power supply connection

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

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

harm it. Not used if J33 is powered through phantom power

from a mixing console.

11. Full-bottom no-slip pad

This provides electrical isolation and plenty of "stay-put" fric-

tion to keep the J33 in one place.

True to the Music

Radial Engineering J33 User Guide

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 off. 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.

If you are planning to connect the J33 without a mixing console

connected to the XLR outputs, you will need to use the external

15v DC power supply. If you plan to connect the J33 using the

XLR outputs to a mixing console, it will likely be equipped with

48v DC phantom power to supply the J33. Performance is identi-

cal with either form of power supply and the J33 will automati-

cally select the power source depending on how you have it set

up. As soon as you connect the J33’s 15v DC power supply or

turn on the phantom power, the J33’s front panel LED indicators

will light up to indicate power is present.

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-ﬁ 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, all at the same time. Depending on how the equip-

ment 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, the

solution is to lift the ground at the PA mixer and use the J33’s

included 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 ﬁrmly 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 ﬁlter. This will usually tame low frequency PA system

feedback.

You are now ready to spin away! Have fun!

True to the Music

FAQ

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

turntable?

Because when the album was produced, a preset EQ curve

was introduced so that on playback you would get better sound.

Keep in mind that when stereo long-play records ﬁ rst appeared

some 60 years ago, the transfer was vibration caused by min-

ute bumps inside the groove. The needle captures these and

converts them to an electrical impulse. This system evolved

to where the quality was surprisingly high. Part of the magic

to the system’s performance was the RIAA curve that enables

the system to produce a musically balanced reproduction of the

original recording.

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.

Radial Engineering J33 User Guide

MP3 Player

Mixing Console

CD-R Recorder

Mixing Console

Dashed line represents

turntable ground wire.

CD-R Recorder

True to the Music

Radial Engineering J33 User Guide

What should I do if I depress the rumble ﬁlter 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 use the Radial J33 for other devices such as key-

boards or computer sound cards?

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

curve 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 off 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 con-

necting to a mixer through the J33's XLR outputs, make sure the

phantom power has been turned on at the mixer.

Can I record an album directly to my computer sound card

using the J33?

Yes. Most sound cards are equipped with a 3.5mm input con-

nector. Connect the line-level output of the J33 to the computer

and you should be set to go. Sound card input levels vary, so

watch for distortion as the output of the J33 is quite hot. Your

computer sound card software should allow you to pad down the

input should this be a mic-level input.

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

Great! The J33 is a low noise preampliﬁer and will out-perform

the typical RIAA preamp built into consumer hi-ﬁ equipment.

J33 Speciﬁcations (subject to change without notice)

Freq. Response (RIAA curve) +19.15dB @ 20Hz to -

19.65dB @ 20kHz

(Ref: 0dB @ 1 KHz)

Total harmonic distortion 0.005 % @ 1 KHz

RIAA deviation +/- .5dB maximum

Max. phono input level 50mV @ 1 KHz

High pass ﬁlter 200Hz cut off, -3dB at 100Hz

Unbalanced outputs 10kOhm, -10dB line-level

Balanced outputs 600 ohms, -60dB mic-level, pin 2 hot

Power (auto-switching) 15v DC or 48v phantom

Size (W x D x H) 3.25”x 5”x1.75” (83x126x45mm)

Weight 1.5 lbs. (.7 kg)

Warranty: 3 Years

J33 BLOCK DIAGRAM

Otros manuales para J33

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