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NHT 

iC4 ARC In-Ceiling Loudspeaker Installation Guide

Speaker Assembly

Metal Grille

Cardboard Cutout 

Template

IC4 Cutout

Template

261,5

Introduction

We’re glad you chose NHT in-ceiling loudspeakers. We know you won’t be disappointed.  Please take a few minutes to read this entire 

Installation Guide prior to installing your new speakers. The information provided will help you to obtain maximum performance from 

your audio system. If you have questions or need assistance at any time before, after or during the installation or operation of your new 

speakers we are here to help. 

Our telephone number is: 707-747-022

Our web address

 www.nhthifi.com

What’s In The Box?

() Speaker assembly 

() Metal grill

() Cardboard Cutout Template

Before we start, please, consider hiring a pro installer to do this while you go fishing with some old friends.

Cutting holes in ceilings and walls and installing heavy objects above you and your Loved Ones heads is serious business. There are also 

numerous decisions concerning wiring, control systems, methods, and best practices only a professional installer will have knowledge 

of.  Please consult a professional to install this speaker. 

Find an Installer near you by visiting www.nhthifi.com - navigate to the Where to Buy section or visit www.cedia.org to find a CEDIA 

installation professional.

One last word of advice - It is up to you to insure that the installer you choose (NHT referred or not) possesses sufficient skills, proper 

tools, and knowledge of local fire and building codes, and has a familiarity with the structure of the building (especially wall and/or ceil-

ing materials, layouts, electrical and plumbing lines, etc.).

With the above said, we know there are capable do-it-yourselfers.  If you are one of them and want to install the speaker on your own 

or with the help of an expert friend, read on.  If you have questions or need assistance at any time before, during or after the installation 

or about the operation of you new speakers, we’re here to help.  Finally, like our fathers told us, measure twice and cut once.

First Paint Warning: 

NHT recommends that you use a capable, professional painter only to paint this speaker grill (if necessary to per-

fectly match the wall or ceiling).  Latex paint will definitely clog the micro-perforated grill holes and constrict the speaker’s performance 

capability.  Contact us if when you need a new grill cover because yours is plugged up with paint.  Unfortunately they are not free.

Summary of Contents for iC4-ARC

Page 1: ...acement 3 Wiring 4 Getting Wired 5 Drill with Caution 6 Installation New Construction ceilings not installed you see ceiling joists when you look up 7 Installation Existing Construction retrofitting finished ceilings 8 Painting 9 In Use 10 Optimizing Sonic Performance 11 Maintenance 12 Service Support Troubleshooting 13 Professional Specifications ...

Page 2: ...lt a professional to install this speaker Find an Installer near you by visiting www nhthifi com navigate to the Where to Buy section or visit www cedia org to find a CEDIA installation professional One last word of advice It is up to you to insure that the installer you choose NHT referred or not possesses sufficient skills proper tools and knowledge of local fire and building codes and has a fam...

Page 3: ... or print to scale one of the grill images from our website full size and tape it to the ceiling maybe Kinko s will do this for you For more information about home theater speaker placement try Dolby Labs website at www dolby com us en consumer setup connection guide home theater speaker guide index html Wiring Retrofit Installations or New Construction How you wire is an important subject If you ...

Page 4: ...induce hum Drill with Caution Remember these are only suggestions There are building codes and best practices to be followed be sure you are familiar with them When drilling holes through wall studs or ceiling joists watch your fingers use a drill bit that is sharp wider than the speaker cable that will be routed pulled through them Always drill through the center of the stud or joist If the hole ...

Page 5: ...hesive and caulking to air seal it your box and insure it will not vibrate rattle fall apart or come loose Make sure it is supported by the ceiling joists not the sheetrock 1 Once you ve selected the desired location s for the speakers begin installing the iCB6 pre construction bracket s between adjacent ceiling joists First attach the mounting wings to the bracket by inserting them into the locki...

Page 6: ...rywall so it butts up to the protruding lip of the mounting bracket as you would cut out for a ceiling light can Once installed the lip of the speaker frame will extend about inch beyond the perimeter of the bracket lip to hide minor imperfections in the cutout fig 3 5 After the ceiling trim work is installed and the painting is complete but just before the carpet or flooring is installed install ...

Page 7: ... the back of the speaker 7 Begin to tighten the screws that at first will rotate the dog legs out 45 and then they will start to move downwards to clamp the ceiling and bracket Tighten the screws carefully but snugly making sure to not over tighten as this may compromise the fit of the speaker assembly The use of power screwdrivers is not recommended but if you must set the toque ratchet setting a...

Page 8: ...sistance while drilling you should stop immediately Do not install the speaker into a drop ceiling T Bar or soft ceiling without a proper backing board to spread the load as this type of construction will not support its weight You will not need the iCB6 pre construction bracket nor will you be able to install it if you wanted to The speaker is designed to mount securely without it assuming you do...

Page 9: ...n the back of the speaker assembly that will swivel out 45 and lower to sandwich the speaker assembly in place between its protruding outer frame and the rear surface of the drywall Begin this phase by being sure the dog legs are rotated sideways like the speaker came packed so that the body of the speaker assembly can slide through the mounting bracket Exercise caution not to damage the drivers t...

Page 10: ...location Use adhesive caulk and extra screws when attaching the drywall to the joists around the speaker Additionally once the speaker cutout has been made in the drywall add a strip of a high quality non hardening construction adhesive type caulk where the drywall meets the joists and cross braces Also for more controlled bass response add code approved fire resistant insulation to the ceiling ca...

Page 11: ...you the products or Contact NHT by telephone go online at www nhthifi com and navigate to the Service Center area for more information Professional Specifications Average Impedance 8Ω Recommended Power 20 150W Max RMS Power Handling 150W Coverage to 60 off axis Cutout dim 10 50 diameter 8 1 2 Depth behind the wall 4 81 4 13 16 Finished dim 11 ...

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