Radial Engineering Trim Two Manuale utente

TRIM-TWO useR guIde

PAssIVe sTeReO dIReCT BOX

AdJusTABLe INPuT TRIM

Radial Engineering Ltd.

1588 Kebet Way, Port Coquitlam BC V3C 5M5

Tel: 604-942-1001 • Fax: 604-942-1010 • Email: [email protected]

Radial Engineering Ltd. Trim-Two™ Stereo Direct Box User Guide

TRIM-TWO™sTeReO dIReCT BOX

useR guIde

Introduction...................................................................................... 1

Features .......................................................................................... 2

Overview.......................................................................................... 3

Making Connections........................................................................ 4

Controls ........................................................................................... 5

Applications ..................................................................................6-7

Optional Mounting Accessories ....................................................... 8

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

Block Diagram ............................................................................... 10

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

Thank you for purchasing the Radial Trim-Two. This is without a doubt one of the most useful direct boxes that we have

ever produced and is sure to give you years of enjoyment.

As with all new products, it is best that you take a few minutes to read through this short manual to review the many fea-

tures that are built in. If you nd yourself wondering about something, please take a moment to view the Trim-Two FAQ

page on our web site. This is where we post the latest updates and questions from users. If afterwards you feel you are still

in need of an answer, feel free to send us a note at [email protected] and we will do our very best to reply in short order.

Now get ready to enjoy the advantages of having a volume control at your ngertips.

Radial Engineering Ltd. Trim-Two™ Stereo Direct Box User Guide

FEATURES

1. ¼” INPUTS: Left and right inputs ideally suited for stereo key-

boards or drum machines, wired in parallel with the RCA and

mini 3.5 TRS connector.

2. RCA INPUTS: Left and right inputs provide an easy connection

from a CD player or other -10dB consumer audio device.

3. 3.5mm TRS INPUT: Standard mini TRS stereo input for connect-

ing a laptop, tablet or iPhone to the Trim-Two.

4. LEVEL: Used to set the input level going into the Trim-2. Elimi-

nates the need for a typical PAD switch.

5. MONO SUM: Side access set & forget switch sums stereo sig-

nals to mono at both XLR outputs.

6. BOOKEND DESIGN: Creates protective zone around the con-

nectors and switches for added durability.

7. XLR OUT: Left and right balanced, low-Z mic-level output. Wired to

AES standard pin-1 ground, pin-2 hot (+) and pin-3 cold (-).

8. GROUND LIFT: Lifts pin-1 at both XLR outputs to help eliminate

hum and buzz caused by ground loops.

9. NO SLIP PAD: Provides electrical & mechanical isolation and

keeps Trim-Two from sliding around.

10. 14:GAUGE STEEL: I-Beam construction prevents circuit board

from being torqued which could lead to part failure. Durable

powder-coat  nish keeps your Trim-Two looking great for years.

6 7 8 9 10

21 3 4 5

Balanced Out

PA System

PC Sound Source

Input

USB

Typical connection using laptop as sound source

Radial Engineering Ltd. Trim-Two™ Stereo Direct Box User Guide

OVERVIEW

The Trim-Two is passive stereo direct box that has been designed from the ground up to be super easy to use. But un-

like other DI boxes, the Trim-Two comes with a level control that lets you adjust the volume by simply reaching over and

twisting a knob. The reason that the Trim-Two can be used this way is that it is intended to be used with buffered or active

sources. Examples include keyboards, sound modules, DJ mixers, laptop computers or tablets. It is not designed for use

with an old Fender bass as the transformers inside that do the balancing are not optimized for passive instruments.

It is important to note that the Trim-Two is a unity gain device. What this means is that when the volume control is set to

maximum, it will produce about the same output level as the source instrument coming in - minus a slight bit due to the

passive nature of transformers. So if you have a loud source such as a line level output from a DJ mixer, you would con-

nect the output from the Trim-Two to the line level input on your mixer.

Since the Trim-Two is passive, it does not require any power to work. You simply connect your source to the Trim-Two and

the outputs to the PA system, and you are set to go.

Powered Monitors

Thru

Balanced Out

PA System

PC Sound Source

Input

Radial Engineering Ltd. Trim-Two™ Stereo Direct Box User Guide

MAKING CONNECTIONS

Before making connections, it is good practice to always ensure your equipment is either turned off or volume levels set to

zero. This will reduce the possibility of turn-on or connection transients from damaging more sensitive components such

as tweeters.

Connect the source instrument or audio device to the Trim-Two using the ¼”, RCA or 3.5mm stereo inputs. All of these are

wired in parallel which enables you to use these as ‘THRU’ outputs for your personal monitoring system. This could neces-

sitate using a pair of RCA to ¼” cables to connect to powered monitors. Try to keep hi-Z unbalanced cables under 8 me-

ters (25’) in length as they are much more susceptible to noise versus low-Z balanced cables. Connect the XLR outputs

to the mixing console. These balanced low-Z outputs can be connected to a mic or line input, depending on the source

(as explained above). Once balanced, you can easily drive cables to 100 meters (300’). You are now set to test the audio.

Radial Engineering Ltd. Trim-Two™ Stereo Direct Box User Guide

ADJUSTING THE VOLUME

LIFTING THE GROUND

USING THE MONO SWITCH

Direct boxes are normally connected to the mic input on a mixing desk.

This enables the DI signals and mics to live side-by-side inside a snake

without cross-talk. Set the volume control to 2 o’clock. Although this will

reduce the output, it is a good place to start as it will likely approximate the

level produced by a typical direct box. This of course is dependent of the

source. If you hear distortion in the PA system or need more gain, simply

adjust the level on the Trim-Two to suit.

As the Trim-Two is completely passive, it is perfect for eliminating hum and

buzz caused by so called ground loops. The transformers inside will block

stray DC voltages that could introduce noise into the audio system. To fur-

ther suppress noise, a ground lift switch can be engaged that disconnects

pin-1 on the two XLR outputs. This lifts the audio ground, providing 100%

isolation. If you hear noise, simply push in to solve the problem.

Sometimes, it is bene cial to mix the stereo source to mono reducing the

channel count going to the PA. The MONO switch is a recessed so that

it can be set & forgotten. This also avoids it being switched by mistake.

Simply depress if needed.

Radial Engineering Ltd. Trim-Two™ Stereo Direct Box User Guide

APPLICATIONS

The following are some common setups that you can enjoy using the Trim-Two:

Stereo RCA Mono

Mono

Ceiling Mounted

Speakers

Outdoor Patio

Speakers

XLR

CD player in restaurant - Connect the CD player’s RCA output to the Trim-Two using standard RCA cables. Activate the

mono sum to use the Trim-Two as a distribution point for two ampli ers. Send the output to ceiling speakers and outdoor

speakers that are powered separately. Note that CD players typically do not have a volume control, so they play at full

output all of the time. If you hear distortion, reduce the Trim-Two level control and adjust the power amp to compensate.

Music playback with a laptop computer or tablet - Simply connect the output from your laptop using a 3.5mm stereo

cable to the Trim-Two. Connect the XLRs to the PA system. Set the volume on the Trim-Two to 2 o’clock and adjust the

output level from your laptop to suit.

RCA Thru

¼” TRS

Thru

¼” TRS

Thru

Powered Monitor

3.5mm Input

USB

¼” TRS Input

RCA Input

XLR

Radial Engineering Ltd. Trim-Two™ Stereo Direct Box User Guide

Stereo keyboard with monitors - Connect to the Trim-Two

using standard ¼” coaxial cables and XLRs for the PA sys-

tem. If you are adding personal monitors, use a set of RCA

to ¼” cables to feed the powered monitors. This essentially

uses the RCA connectors as a typical THRU. Note that the

THRU outputs will not be affected by the Trim-Two Level

control. In other words, your keyboard volume control will

determine the sound going to your monitors. Start by setting

this up so that it is comfortable for you and then set the level

control for the PA.

Controller keyboard with laptop - More and more key-

board players are using a laptop to generate audio  les and

‘play’ the computer using a controller keyboard with a USB

port. Connect the output from the laptop to the Trim-Two us-

ing the 3.5mm connector. Use the XLR outs to feed the PA

and the ¼” outputs to feed the monitors on stage.

Using the Trim-Two for a DJ setup - DJ mixers can be no-

toriously problematic due to the DJ being too loud. This can

cause distortion or even harm the PA system. Connecting

the DJ mixer to the Trim-Two enables you to set a maximum

level and is quick to adjust should need be. Connect a de-

vice to the Trim-Two using the RCA or ¼” inputs.

Radial Engineering Ltd. Trim-Two™ Stereo Direct Box User Guide

J-RAK 8 J-RAK 4

OPTIONAL RACK MOUNTING KITS

J-CLAMP

The J-Rak 8 and J-Rak 4 are an innovative rack mount chassis. The J-Rak 8 has eight vertical slots for Radial Trim-Two Stereo

direct boxes or the other Radial J-Class products. The J-Rak 4 has four horizontal slots. Note you cannot access the mono

switch on the Trim-Two when mounted in a J-Rak product, set before installing.

Each direct box can be front or rear mounted allowing the system designer to have the XLR’s on the front of the rack or rear,

depending on the application.

The J-Clamp is a mounting adapter that allows any of the

Radial J-Class products to be permanently mounted in loca-

tions such as in podiums, under board room tables and inside

ampli er and effect racks. Features a heavy-duty steel shell

with built in mounting  ange and user-writable tabs.

LAPTOP AND MULTIMEDIA The 3.5mm inputs face front

allowing easy connection for electronics devices.

Radial Engineering Ltd. Trim-Two™ Stereo Direct Box User Guide

Audio circuit type: .................................................................................................................... Passive transformer isolated

Frequency response:..................................................................................................................... 20Hz to 20kHz (-1/+3db)

Total Harmonic Distortion: (THD+N)......................................................................................0.009% (1kHz with 100k load)

Dynamic range: .................................................................. >126dB (difference between noise oor and maximum output)

Input impedance:.............................Approx 10k with 100k load (depends on load impedance; about 6k with mono mode)

Maximum input: .....................................................................................................................................................> +20dBu

Gain:................................................................................................................... -1dB (10k load; level control at maximum)

Clip Level - Output:................................................................................................................................................ > +11dBu

Output impedance: ..................................................................2800Ω (level control at maximum; higher at lower settings)

Noise oor: ........................................................................................................................................................... < -115dBu

Intermodulation distortion: ............................................................................................................. extension (-10dBu input)

Phase Deviation: ........................................................................................................ <10° (20Hz to 20kHz with 100k load)

THD+N: ...............................................................................................................................................0.006% (-5dBu input)

Input pad:...............................................................................................................................................Variable trim control

XLR conguration:................................................................................................ Pin-1 ground; pin-2 hot (+); pin-3 cold (-)

Other connectors:............................................................................................................1/4” TRS, RCA and Mini Phone In

Power: ............................................................................................................................................................None, passive

Construction: ............................................................................................................................................... Steel Enclosure

Size: (LxWxD)............................................................................................... 5” x 3.3” x 1.8” (127mm x 84.1mm x 45.5mm)

Weight: .................................................................................................................................................1.55 lbs (703 grams)

Shipping size: ...................................................................................................... 6.5” x 4” x 3” (165mm x 102mm x 76mm)

Shipping weight: ................................................................................................................................1.92 lbs (870.9 grams)

Warranty: .................................................................................................................................... Radial 3-year, transferable

SPECIFICATIONS

Indice

Altri manuali Radial Engineering Impianto stereo