Kramer SPK-C411 User manual

KRAMER ELECTRONICS LTD.

USER MANUAL

MODELS:

SPK-C411

Closed-back Ceiling Speakers

SPK-C412

Closed-back Ceiling Speakers

P/N: 2900-300188 Rev 1

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SPK-C411 / SPK-C412 – Contents i

Contents

1Introduction 1

2Getting Started 2

2.1 Achieving the Best Performance 2

3Overview 3

4Your Closed-back Ceiling Speakers 4

5Installing the Closed-back Ceiling Speakers 6

5.1 Choosing the Best Location 6

5.2 Cutting the Ceiling Tile 6

5.3 Mounting the SPK-C411 / SPK-C412 Speakers 7

5.4 Painting the Speaker 10

6Technical Specifications 11

Figures

Figure 1: SPK-C411 / SPK-C412 Closed-back Ceiling Speakers in a Boardroom Setup 3

Figure 2: SPK-C411/ SPK-C412 Closed-back Ceiling Speaker 4

Figure 3: Closed-back Ceiling Speaker Schematic Diagram 5

Figure 4: Mounting the SPK-C411 / SPK-C412 Closed-back Ceiling Speakers 7

Figure 5: Plugging and Securing the Cable 8

Figure 6: Tighten the Mounting Tabs 9

Figure 7: Adjust Tap Selector (for SPK-C411 and SPK-C412, Respectively) 9

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SPK-C411 / SPK-C412 - Introduction 1

1 Introduction

Welcome to Kramer Electronics! Since 1981, Kramer Electronics has been

providing a world of unique, creative, and affordable solutions to the vast range of

problems that confront video, audio, presentation, and broadcasting professionals

on a daily basis. In recent years, we have redesigned and upgraded most of our

line, making the best even better!

Our 1,000-plus different models now appear in 11 groups that are clearly defined

by function: GROUP 1: Distribution Amplifiers; GROUP 2: Switchers and Routers;

GROUP 3: Control Systems; GROUP 4: Format/Standards Converters; GROUP 5:

Range Extenders and Repeaters; GROUP 6: Specialty AV Products; GROUP 7:

Scan Converters and Scalers; GROUP 8: Cables and Connectors; GROUP 9:

Room Connectivity; GROUP 10: Accessories and Rack Adapters and GROUP 11:

Sierra Products.

Congratulations on purchasing your Kramer SPK-C411 and SPK-C412

Closed-back Ceiling Speakers, which are ideal for the following typical

applications:

•Boardrooms •Presentation venues

•Conference rooms •Training rooms

•Educational classrooms •Hotel lobbies

The package includes the following items:

•A pair of SPK-C411 and/or SPK-C412 speakers

•Mounting kit

•This user manual

SPK-C411 and SPK-C412 are designed for indoor dry locations

and are suitable for use in air handling spaces (plenum spaces).

2 SPK-C411 / SPK-C412 - Getting Started

2 Getting Started

We recommend that you:

•Unpack the equipment carefully and save the original box and packaging

materials for possible future shipment

•Review the contents of this user manual

•Use Kramer high-performance high-resolution cables

Go to http://www.kramerelectronics.com to check for up-to-date

user manuals, application programs, and to check if firmware

upgrades are available (where appropriate).

2.1 Achieving the Best Performance

To achieve the best performance:

•Use only good quality connection cables (such as the Kramer BC-2S) to

avoid interference, deterioration in signal quality due to poor matching, and

elevated noise levels (often associated with low quality cables)

•Do not secure the cables in tight bundles or roll the slack into tight coils

•Avoid interference from neighboring electrical appliances that may adversely

influence signal quality

•Position your Kramer SPK-C411 / SPK-C412 away from moisture,

excessive sunlight and dust

To ensure that you obtain the best sound results, do not open the

housing of the passive speaker or the active speaker.

UL2043 – Fire Test for Heat and Visible Smoke Release for

Discrete Products and their Accessories Installed in Air-Handling

Spaces.

SPK-C411 / SPK-C412 - Overview 3

3 Overview

The SPK-C411 / SPK-C412 Closed-back Ceiling speakers consist of a pair of high

performance closed back speakers. The pair can be mounted on the ceiling, as

well as via a ceiling mounting kit used to safely secure the speakers to the ceiling.

The speakers are defined in the following table:

Name Diameter [ " ] Impedance [

Ω

] Closed-back Depth [ " ]

SPK-C411 4 4 4

SPK-C412 4 8 4

Figure 1shows an example of how the SPK-C411 / SPK-C412 Closed-back

Ceiling speakers can be installed in a boardroom setup:

Figure 1: SPK-C411 / SPK-C412 Closed-back Ceiling Speakers in a Boardroom Setup

4 SPK-C411 / SPK-C412 - Your Closed-back Ceiling Speakers

4 Your Closed-back Ceiling Speakers

Figure 2defines the SPK-C411 / SPK-C412.

Figure 2: SPK-C411/ SPK-C412 Closed-back Ceiling Speaker

The following table defines the Closed-back Ceiling speaker hardware items (per

speaker pair) for each model in the series:

Description

A pair of

ceiling

speakers

(one shown)

Two grilles

(one shown)

Cutout

template

This table defines the ceiling mounting kit items:

Four

support

ring

screws

Two ceiling

support rings

(C-ring) – one

shown

Two pairs of

tile rails –

one of a pair

shown

SPK-C411 / SPK-C412 - Your Closed-back Ceiling Speakers 5

Each Closed-back Ceiling speaker is supported by a C-ring and two tile rails. The tile

rails prevent the speakers from falling if the tile itself comes out or falls apart, as

their ends catch onto the T-grid. When mounting onto the ceiling tiles, use both

supports. When mounting onto a sheetrock ceiling, the C-ring alone is used to

reinforce the ceiling material.

Be sure that the tiles can support the speaker. Smaller sized tiles or

fiberglass-type tiles cannot support the weight of the speakers.

When this is the case, the speakers will need additional support.

Figure 3shows a schematic diagram of the Closed-back Ceiling speaker:

Figure 3: Closed-back Ceiling Speaker Schematic Diagram

6 SPK-C411 / SPK-C412 - Installing the Closed-back Ceiling Speakers

5 Installing the Closed-back Ceiling Speakers

This section explains how to install the SPK-C411 / SPK-C412 closed-back ceiling

speakers, that is:

•Choosing the best place to locate your speakers (see Section 5.1)

•Cutting the ceiling tile (see Section 5.2)

•Mounting the Speakers (see Section 5.3)

•Painting the speakers (see Section 5.4)

5.1 Choosing the Best Location

Ideally, locate the speakers above the main listening area. Before doing so, be

sure that:

•The desired location is free of obstructions, such as electrical piping, AC

ducts or water lines, and so on

•There is enough space behind the mounting surface for the speakers

•The rear side of the speaker is not blocked by wall studs or other objects

5.2 Cutting the Ceiling Tile

To cut the ceiling tile, do the following:

1. Remove the circle in the supplied template.

Keep this template for later use as a mask, as you may want to paint the speakers (see

Section 5.4)

2. Mark the opening in the correct location by tracing the hole in the template.

3. Cut out the hole according to the template or with a circular cutter set to the

appropriate cutout size.

Initially, you can cut a smaller area inside the marked hole just to be sure that the

space above the speakers is clear

4. Route the wiring from the amplifier to the speakers’ cutout holes, taking care

not to place them next to electrical wires or at least at a distance of about

two feet from an AC line.

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