Radial Engineering Gold Digger Manuel utilisateur

TruetotheMusic

www.radialeng.com

TruetotheMusic

User Guide

www.radialeng.com

Radial Engineering Ltd.

1588 Kebet Way, Port Coquitlam

British Columbia, Canada, V3C 5M5

tel: 604-942-1001 • fax: 604-942-1010

email: [email protected]

Gold Digger

4x1 Microphone Selector

™

Radial®GoldDigger™

MicrophoneSelector

Table of Contents......................................................Page

Overview........................................................................ 1

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

Making Connections....................................................... 3

Setting Trim Levels......................................................... 4

When To Use.................................................................. 4

Speciﬁcations................................................................. 5

Warranty............................................................Back cover

www.radialeng.com

INTRODUCTION

Thank you for purchasing the Radial Gold Digger. We are very excited about how this product

can improve workﬂow and efﬁciencies in the studio. We are also very conﬁdent that once

you get it in use, you too will ﬁnd it to save you time and bring another level of creativity to

your production.

Although the Gold Digger is extremely easy to use, it is well advised that you take a few

minutes to quickly read through this short manual. Inside, you will surely ﬁnd some hints on

how to best approach using the Gold Digger in your studio. If you do not ﬁnd everything you

need, please go to the Gold Digger web pages on our site and visit the FAQ section. This is

where we publish the latest updates and answer questions from users. Then, if you are still

in need of more information feel free to send an email to [email protected] and we will do

our best to reply in short order.

Now get out there and start switching!

Radial Engineering Ltd. Gold Digger™ Microphone Selector

TruetotheMusic ®

OVERVIEW

The Gold Digger is a 4-in, 1-out switcher designed speciﬁcally for microphones.Although this

may seem simple from the outside, there are a number of concerns that were addressed to

makeitworkeasily,quicklyandwithoutnoise. Thisincludesswitching‘poweredmicrophones’

such as condensers without creating huge pops that can blow tweeters. Another concern is

keeping old vintage ribbon mics safe. We wanted to make it easy to set up a fair comparison.

This meant that the Gold Digger could not impart any form of coloration or distortion to

the signal path, but we also had to have some type of level control to ensure the tests are

conducted fair and square so that one mic would not be louder than the next.

Ultimately, you will ﬁnd the Gold Digger to be super easy to use and will save you time as you

ﬁnd the best mic to suit a certain application. Have fun. Experiment. This is what the Gold

Digger is designed to do.

DAW INTERFACE

MICROPHONE PREAMP

MIC 1 MIC 2 MIC 3 MIC 4

1234

Typical Setup Diagram

Radial Engineering Ltd. Gold Digger™ Microphone Selector

TruetotheMusic

6 87 9

FEATURE SET

1. CHANNEL ON 1 to 4: Radio style

push button switches automatically

turn the selected mic on and the other

microphones off to eliminate bleed.

Illuminated LED indicates which channel

is active.

2. TRIM ADJUST 1 to 4: Individual ‘set &

forget’ trim controls let you quickly match

the signal level between different mics to

ensure a fair and honest comparison.

3. +48V PHANTOM: Turns on the phantom

power that condenser microphones and

active direct boxes require. Switch is

recessed to protect against accidental ‘turn

on’ that could damage vintage ribbon mics.

LED indicator illuminates when phantom is

active.

4. RECESSED PANEL: Extended lip creates

protective zone around the switches and

controls when using the Gold Digger on

stage or in less than ideal locations.

5. 14-GAUGE STEEL: Heavy duty

construction eliminates stress on the PCB

and provides excellent shielding against

magnetic ﬁelds and RF which otherwise

could introduce noise.

6. CABLE CLAMP – Locking cable clamp

lets you secure the power cable to

the Gold Digger to prevent accidental

disconnection.

7. 15VDC: Like professional mixers, the

power supply is taken out of the box

to reduce noise and ensure the most

transparent signal ﬂow.

8. XLR OUTPUT: Use to connect the Gold

Digger output to a microphone preamp.

9. XLR INPUTS: Use to connect

microphones to the Gold Digger. Heavy

duty glass-ﬁlled XLRs with nickel-silver

contacts are stronger than steel and

provide 100% isolation between channels

to reduce noise and crosstalk.

10. PAD: Full bottom no-slip neoprene foam

pad provides electrical insulation and

mechanical isolation for plenty of stay-

put-ness.

1 2 3 4 5

Radial Engineering Ltd. Gold Digger™ Microphone Selector

TruetotheMusic ®

MAKING CONNECTIONS

Before making audio connections, always ensure volumes levels are turned down or off.This

prevents turn-on transients which could harm more sensitive components such as tweeters.

There is no power switch on the Gold Digger.As soon as you connect the power supply, it will

turn on. If you are using the Gold Digger in a mobile studio or in a high trafﬁc area, you may

want to use the power supply cable clamp for an extra secure power connection.

With the power connected, follow these steps to set up the Gold Digger controls. First, make

sure each of the four Gold Digger mic inputs has the +48V phantom power switch in the off

position (outward, LEDs off). Also turn off the phantom power feature on your mic preamp.

For best results, the Gold Digger should be the only source of phantom power. Next, set the

four TRIM controls to maximum (fully clockwise). Use a guitar pick or small screw driver to

make adjusting the TRIM controls easy.

Take a moment to notice how the mic input ON buttons work. When pressed, the switch will

simultaneously turn-on the mic input while also turning-off whatever mic is currently active.

This switching method allows only one mic signal to pass through the Gold Digger at a time.

Connect your microphones to the Gold Digger mic inputs using standard XLR cables.

Determine if +48V phantom power is needed depending on the type of microphone. Most

condenser microphones can be powered by the Gold Digger’s onboard phantom power.

Dynamic or ribbon mics do not need it and phantom can be left off for those mic inputs.

Simply use a small screw driver to access the recessed +48V switch if phantom is needed.

An illuminated LED indicated the phantom power is active for that mic input.

Connect the Gold Digger’s male XLR output to your preamp or mixer and use a low gain

setting for testing. Select input-1 (LED will illuminate) and monitor the mic signal as you

slowly turn up the volume on your audio system. It is always best to test all four mics at low

volumes as this reduces opportunity for feedback or noise due to bad cables or improper

connections. Move on and repeat the signal check process for the rest of the mics connected

to the Gold Digger inputs. Once all four mics are tested and working you can set the front

panel TRIM controls to balance the outputs of the microphones.

1234

MIC PREAMP

Radial Engineering Ltd. Gold Digger™ Microphone Selector

TruetotheMusic

SETTING THE TRIM LEVELS

Setting the TRIM levels on the front panel is a very important step if you are interested in

achieving a fair evaluation between mics. The Gold Digger’s four TRIM controls allows the

output level of each mic to be adjusted individually. Properly setup, there should be very little

change in level when switching between the four mics. This will help ensure a fair and honest

evaluation of your microphones.

Begin by ensuring all four TRIM controls are set to maximum (fully clockwise). Next,

determine which of the four mics has the lowest output level by switching between mics while

monitoring the output. Once the lowest output mic has been determined the TRIM controls

are used to attenuate the louder mics to match. For instance, if mic-1 is the lowest output

mic, leave it’s TRIM set at maximum and reduce the gain of the other mics to match. Using

a guitar pick or small screwdriver, turn the louder mic’s TRIM controls counter-clockwise until

the relative output level stays the same when switching between mics.

+48V

TRIM

+48V

TRIM

+48V

TRIM

+48V

TRIM

MIC INPUT MIC INPUT MIC INPUT MIC INPUT

4 CHANNEL MIC SELECTOR

MIC INPUT MIC INPUT

+48V

MIC INPUT MIC INPUT

4321

ON +48V

TRIM TRIM TRIM TRIM

+48V

Dynamic

+48V: Off

TRIM: Max +48V: Off

TRIM: -3dB +48V: Off

TRIM: -3dB +48V: On

TRIM: -8dB

Dynamic 3

Ribbon 4

Condenser

Once all of the mic levels have been matched, you can ﬁnalize your preamps gain setting and

additional signal processing like compression and equalization. Keep in mind that dynamic

microphones do not have built-in buffers like condensers. This means that when you adjust

the TRIM level, the tone may change slightly because of small changes to the impedance.

Good news here is that if you are comparing a dynamic to a condenser, the condenser, by

virtue of it’s active buffers, will usually be louder and less prone to impedance changes, thus

trimming down the level on condenser mics will have no sonic effect on the sound allowing

you to make a fair comparison between dynamic and condenser mics.

WHEN DOES ‘COMPARING MICS’ MAKE SENSE?

The most obvious time to use the Gold Digger will be with vocalists. There is no question

that singers perform better when the sound they hear in their headphones is the one they

envision in their head. Using the Gold Digger to compare mics on guitar cabinets can lead

to very interesting results as well. The same can be said on a snare drum or even on a kick

drum. Putting up more than one mic takes no time at all, and with the Gold Digger in the

signal path, you are not adding any noise or distortion so you are not compromising your

tone in any way. Just have fun!

Radial Engineering Ltd. Gold Digger™ Microphone Selector

TruetotheMusic ®

RADIAL GOLD DIGGER SPECIFICATIONS

Circuit Type.............................. Passive signal path with active relay switching

Frequency Response .............. 20Hz to 20kHz

THD + N .................................. 0.0003%

Dynamic range ........................ -140dBu

Equivalent Input Noise............. -115dBu

CMRR...................................... -92db @ 55Hz

Input Impedance...................... 600 Ohms nominal

Output Impedance................... Same as source impedance

XLR Conﬁguration:.................. Follows AES spec: pin-1 ground, pin-2 hot (+), pin-3 cold (-)

Power requirement.................. 15VDC / 150mA (adapter supplied)

Size (W x H x D):..................... 5.8” x 1.88” x 4.5” (148mm x 48mm x 115mm)

Weight ..................................... 2.1 lbs. (0.96 kg)

Warranty.................................. 3 years, transferable limited warranty

USING THE GOLD DIGGER TO COMPARE DI BOXES

You can also compare direct boxes following the same procedure. You would be surprised

at how different each DI can sound. In fact you may be surprised to ﬁnd that just like

microphones, DIs all have different personalities that can truly ﬂatter certain instruments or

render them listless

For even more fun, get a Radial Cherry Picker! This lets you compare various preamps to

ﬁnd the best one for a given vocal.

1234

MIC PREAMP 3

MIC PREAMP 4

MIC PREAMP 2

MIC PREAMP 1

www.radialeng.com

TruetotheMusic

THREE YEAR TRANSFERABLE LIMITED WARRANTY

RADIALENGINEERINGLTD.(“Radial”)warrants this product to befreefromdefectsin material and

workmanshipandwillremedyanysuchdefectsfreeofchargeaccordingtothetermsofthiswarranty.

Radialwillrepairorreplace(atitsoption)anydefectivecomponent(s)ofthisproduct(excludingﬁnish

and wear and tear on components under normal use) for a period of three (3) years from the original

date of purchase. In the event that a particular product is no longer available, Radial reserves the

right to replace the product with a similar product of equal or greater value. In the unlikely event that

a defect is uncovered, please call 604-942-1001 or email [email protected] to obtain an RA

number(ReturnAuthorizationnumber)beforethe3yearwarrantyperiodexpires.Theproductmustbe

returnedprepaidintheoriginal shippingcontainer(orequivalent)toRadialortoanauthorizedRadial

repaircenterandyoumustassumetheriskofloss or damage.Acopyoftheoriginalinvoiceshowing

dateof purchaseand the dealer name mustaccompany anyrequest for work to beperformed under

thislimitedandtransferable warranty.Thiswarrantyshall not apply iftheproducthasbeendamaged

due to abuse, misuse, misapplication, accident or as a result of service or modiﬁcation by any other

than an authorized Radial repair center.

THERE ARE NO EXPRESSED WARRANTIES OTHER THAN THOSE ON THE FACE HEREOF

ANDDESCRIBEDABOVE.NOWARRANTIESWHETHEREXPRESSEDORIMPLIED,INCLUDING

BUT NOTLIMITED TO,ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR

A PARTICULAR PURPOSE SHALL EXTEND BEYOND THE RESPECTIVE WARRANTY PERIOD

DESCRIBED ABOVE OF THREE YEARS. RADIAL SHALL NOT BE RESPONSIBLE OR LIABLE

FOR ANY SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSS ARISING FROM

THE USE OF THIS PRODUCT. THIS WARRANTY GIVES YOU SPECIFIC LEGALRIGHTS, AND

YOUMAYALSO HAVE OTHERRIGHTS, WHICH MAY VARYDEPENDINGON WHEREYOU LIVE

AND WHERE THE PRODUCTWAS PURCHASED.

Speciﬁcations and appearances subject to change without notice.

Radial®Gold Digger™User Guide • rev1.0 • Part #: R870 1232 00

Radial Engineering Ltd.

1588 Kebet Way, Port Coquitlam, British Columbia, V3C 5M5

tel: 604-942-1001 • fax: 604-942-1010 • email: [email protected]

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