Blue Sky International MK II Manual de usuario

Blue Sky International

70 Sea Lane

Farmingdale, NY 11735

www.abluesky.com

Owner’s Manual

Version 1b | August 5, 2005

Bass-Management ControllerMK II

Contents

Important Safety Instructions _ __ __ __ __ __ __ __ __ __ __Page 3

1 Philosophy and Introduction __ __ __ __ __ __ __Page 4

2 Important Notes About This Owner’s Manual _ __Page 4

3 The Blue Sky | BMC MK II - What is included?__ __Page 4

4 A Tour of the BMC MK II I/O Unit __ __ __ __ __ __ Page 5

5 A Tour of the BMC MK II Remote __ __ __ __ __ __Page 5

6 System Gain, Sub Offset and Level Overview _ __Page 7

7 BMC MK II Power Up Sequence_ __ __ __ __ __ __Page 7

8 Software Features__ __ __ __ __ __ __ __ __ __ __Page 8

9 5.1 Speaker Placement __ __ __ __ __ __ __ __ _Page 10

10 5.1 System Wiring Information & Diagram__ __ _Page 11

11 5.1 System Calibration __ __ __ __ __ __ __ __ _Page 12

12 Additional Surround & Setup Information _ __ _Page 15

13 Dual BMC MK II I/O Unit Setup __ __ __ __ __ __ _ Page 16

14 Technical Information & Speciﬁcations _ __ __ _Page 18

15 Product Dimensions __ __ __ __ __ __ __ __ __ _Page 18

16 Factory Service Instructions _ __ __ __ __ __ __ _Page 19

17 General Contact Details __ __ __ __ __ __ __ __ _ Page 19

Contents

1 READ INSTRUCTIONS - Read all safety and operating instructions

before operating this product.

2. RETAIN INSTRUCTIONS - Retain these safety and operating

instructions for future reference.

3. HEED WARNINGS - Follow all warnings on this product and in the

operating instructions.

4. FOLLOW INSTRUCTIONS - Follow all operating and use

instructions.

5. ATTACHMENTS - Do not use attachments not recommended by the

product manufacturer as they may cause hazards.

6. WATER AND MOISTURE - Do not use this product near water - for

example, near a bathtub, washbowl, kitchen sink, or laundry tub; in

a wet basement; or near a swimming pool; and the like.

7. ACCESSORIES - Do not place this product on an unstable cart,

stand, tripod, bracket, or table. The product may fall, causing serious

injury to a child or adult, and serious damage to the product. Use

only with accessories recommended by the manufacturer, or sold

with the product. Any mounting of the product should follow the

manufacturer’s instructions and should use a mounting accessory

recommended by the manufacturer.

8. POWER SOURCE - This product should be operated only from

the type of power source indicated on the marking label on the

back of the product. If you are unsure of the type of power that is

supplied to your home, consult your product dealer or local power

company.

9. OVERLOADING - Do not overload wall outlets or extension cords

as this can result in a risk of ﬁre or electric shock.

10. LIQUID ENTRY - Never spill any liquid of any kind on the product.

11. SERVICING - Do not attempt to service this product yourself.

Opening or removing covers, including any over bottom or side

speaker drivers, may expose you to dangerous voltage or other

hazards. Refer all service to qualiﬁed service personnel.

12. DAMAGE REQUIRING SERVICE - Unplug this product from the

wall outlet and refer servicing to qualiﬁed personnel under the

following conditions:

a. When the power-supply cord or plug is damaged.

b. If liquid has been spilled, or objects have fallen into this

product.

c. If the product does not operate normally by following the

operating instructions. Adjust only controls that are covered

by the operating instructions as an improper adjustment of

other controls may result in damage and will often require

extensive work by a qualiﬁed technician to restore the

product to its normal operation.

d. If the product has been dropped or damaged in any way.

e. When the product exhibits a distinct change in performance

- this indicates a need for service.

13. REPLACEMENT PARTS - When replacement parts are required be

sure the service technician has used replacement parts speciﬁed

by the manufacturer or have the same characteristics as the original

part. Unauthorized substitutions may result in risk of ﬁre, electric

shock, or other hazard.

14. SAFETY CHECK - Upon completion of any service or repairs to this

product, ask the service technician to perform safety checks to

determine that the product is in proper operating condition.

15. HEAT - This product should be situated away from heat sources

such as radiators, heat registers, stoves, or other products that

produce heat.

Safety Instructions

Page 3

Page 4

1. Philosophy &Philosophy &

Introduction

Blue Sky is a philosophy. We design each product to represent the highest

ratio possible of performance to cost, providing the highest value added to

our customers.

We will continually seek out opportunities to utilize the talent of the Blue Sky

team to realize this philosophy. Our customer’s value requirements will always

be our prime focus, and only those products that achieve our performance

value ratio will earn the right to carry the Blue Sky logo.

The Blue Sky BMC MK II continues this lineage and philosophy of high value and

superior performance products. Designed for use with 5.1 channel monitoring

systems (and beyond!), the Blue Sky BMC MK II allows for complete control of

all monitoring system parameters from a single, easy-to-use, remote control.

The Blue Sky BMC MK II eliminates the many variables of putting together a

reliable, easy to calibrate 5.1 monitoring system, allowing the user to monitor

with conﬁdence!

We thank you for your investment in this Blue Sky product.

www.abluesky.com

2. Important notes about

this Owner’s Manual

The Owner’s Manual:

This manual addresses setup and operation of the Blue Sky BMC MK II. This

product includes several performance and operational changes, when

compared to the original Blue Sky BMC. We ask that you read this owner’s

manual carefully, heed all warnings and contact Blue Sky International if you

have any comments or questions. Contact information can be found on page

19 or you can visit www.abluesky.com.

Using the Blue Sky BMC MK II with the SAT 5 or SAT 5 MK II

In order to get the proper summation between SAT 5 and a Blue Sky

subwoofer, when using the Blue Sky BMC MK II, it is important that you switch

the internal High Pass (HP) Filter on the back of the SAT 5 to the “OUT” of circuit

position. Because the BMC MK II already includes an internal High Pass Filter,

leaving the internal HP ﬁlter on the SAT 5 “IN” circuit, will create a hole at the

crossover point between the SAT and SUB,

3. Blue Sky BMC MK II

what is included?

The Blue Sky BMC MK II includes the items listed below. Please carefully

unpack each item and inspect the components for damage. If any item has

been damaged, please contact the dealer that supplied the product or Blue

Sky directly.

BMC MK II Inventory:

1 BMC MK II I/O Unit

1 BMC MK II Remote

1 25 Foot, 6 conductor, RJ-11 Cable

1 Owner’s Manual

1 Warranty Card

Page 5

1. Power Switch - This switch controls the power to the BMC remote and all

internal electronics.

2. 5.1 Channel Inputs - These XLR inputs should be connected to the

5.1 channel outputs of your console or digital workstation. The inputs are

electronically balanced (Max input +24dBu). Do not connect more than one

source to these inputs. Refer to the wiring table on page 11 for wiring custom

cables and connectors.

3. L, C, R, LS & RS Outputs - These XLR outputs should be connected to

the inputs of the active monitors. These outputs are electronically balanced.

These outputs can be full range or bass-managed with a bandwidth limited to

spectral content above 80Hz. Refer to the wiring table on page 11 for wiring

custom cables and connectors.

4. Parallel Subwoofer Outputs - These outputs can be used to drive one

or more active subwoofers. The output signal is the sum total of both the LFE

and the bass-managed subwoofer signal (when the bass-management feature

is being used). Refer to the wiring table on page 11 for wiring custom cables

and connectors.

5. Remote Control RJ-11 Connector - This standard six conductor RJ-11 jack

is used to connect the main I/O unit to the BMC remote. The remote control

cable length should not exceed 100 Feet.

6. IEC Power Terminal - Input Power Voltage 120 VAC / 60Hz or 240 VAC 50

/ 60Hz (set at the factory), rated for 15- Watts. Use the included IEC Power

Cable.

3 5 64

bass management controller MK II

4. A Tour of the BMC MK II - Main I/O

5. A Tour of the BMC MK II | Remote

SELECT CANCEL

bass management controller Remote

YES

MUTE

REF

MK II

MENU GAIN

SUB

LS RS

REV 2.00

BLUE SKY INT

Main Aux

11 12 13

The Blue Sky BMC MK II has two operating modes. These two modes are

referred to as “USER” and “SETUP”. Some of the buttons on the remote

have two distinct functions depending on what mode the BMC MK II is

operating in. The “Software Features” on page 8 and 9 explains these

functions in greater detail.

1. RJ-11 Main BMC Control Output - Connect this plug to the Main BMC

I/O unit with the supplied 25 ft. 6 conductor phone cable. This cable can be

extended to a maximum of 100 ft. using standard 6 conductor phone (not

data) cable.

2. RJ-11 Aux BMC I/O Control Output - This output allows for the control of

a second BMC I/O unit, for a total of 10.2 channels of audio.

3. R(ight) / + / YES Button -

USER MODE: The “R” button activates the solo function for the “right output”.

When a second I/O unit is connected, the solo function for the “right output

#2” can be activated by holding this button down for 2 seconds. Solo can be

cancelled by doing any of the following; activating the solo function on another

channel, muting the system, or by pressing the “REF” / reference button.

SETUP MODE: The + / YES button is used to adjust parameters within the

submenus. Press to increase individual channel levels, mute channels and set

the reference gain setting. See the “Software Features” section on page 8 and

9 for more information.

4. C(enter) / Arrow Up Navigation Button -

USER MODE: The “C” button activates the solo function for the “center output”.

When a second I/O unit is connected, the solo function for the “center output

#2” can be activated by holding this button down for 2 seconds. Solo can be

cancelled by doing any of the following; activating the solo function on another

channel, muting the system, or by pressing the “REF” / reference button.

SETUP MODE: Used to scroll up through the software submenus. See the

“Software Features” section on page 7 and 8 for more information.

Page 6

5. L(eft) / - / NO Button -

USER MODE: The “L” button activates the solo function for the “left output”.

When a second I/O unit is connected, the solo function for the “left output

#2” can be activated by holding this button down for 2 seconds. Solo can

be cancelled by doing any of the following; activating the solo function on

another channel, muting the system, or by pressing the “REF” / reference

button.

SETUP MODE: Used to adjust parameters within the software. Press to decrease

individual channel levels and un-mute channels. See the “Software Features”

section on page 8 and 9 for more information.

6. SUB(woofer) / Arrow Down - Navigation Button -

USER MODE: The “SUB” button activates the solo function for the “subwoofer

output”. When a second I/O unit is connected, the solo function for the

“subwoofer output #2” can be activated by holding this button down for 2

seconds. Solo can be cancelled by doing any of the following; activating the

solo function on another channel, muting the system, or by pressing the “REF”

/ reference button.

SETUP MODE: Used to scroll down through the software submenus. See the

“Software Features” section on page 8 and 9 for more information.

7. REF(erence) LED - This LED is “ON” when the REF (reference) control

button / setting has been activated. It indicates that the gain is set to the user

predeﬁned reference level setting. See item 10 below.

8. MUTE LED - “On” when all outputs have been muted. “Flashing” when one

or more channels have been muted within the “Mute Channels” submenu of

the software or if the solo function has been activated. See item 9 below.

9. MUTE Control Button -

Toggles the system in and out of mute. Press this button to mute all outputs.

Press again to cancel Mute. Moving the Volume Control Knob will also cancel

mute .

SETUP MODE: In the “PRESET MENU”, this key is used to change the letters, in

the “CHANGE NAME” preset sub menu. See the “Software Features” section

on page 8 and 9 for more information.

10. REF (reference) Control Button -

USER MODE: Toggles the system in and out of reference gain. Press this button

to set the gain to the user deﬁned reference gain. Press again to cancel. Moving

the Volume Control Knob will bring the system out of the reference setting.

SETUP MODE: In the “PRESET MENU”, this key is used to change the letters, in

the “CHANGE NAME” preset sub menu. See the “Software Features” section

on page 8 and the 5.1 System “Calibration Section” on page 12 for more

information.

11. LS (left surround) / SELECT Button -

USER MODE: The “LS” button activates the solo function for the “left surround

output”. When a second I/O unit is connected, the solo function for the

“left surround output #2” can be activated by holding this button down for

2 seconds. Solo can be cancelled by doing any of the following; repeating

the same action, activating the solo function on another channel, muting the

system, or by pressing the “REF” / reference button.

SETUP MODE: Hold down for 5 seconds to activate “SETUP MODE” and then

press again to scroll through the main software menus, “PRESET MENU”, “MUTE

CHANNELS”, “CAL(ibrate) CHANNELS” and “SETUP MENU”. See the “Software

Features” section on page 8 and the 5.1 System Calibration Section on page

12 for more information.

12. RS (right surround) / CANCEL Button -

USER MODE: The “RS” button activates the solo function for the “right surround

output”. When a second I/O unit is connected, the solo function for the

“right surround output #2” can be activated by holding this button down for

2 seconds. Solo can be cancelled by doing any of the following; repeating

the same action, activating the solo function on another channel, muting the

system, or by pressing the “REF” / reference button.

SETUP MODE: Press to cycle backwards through the menu and to get out of

any sub menu operations.

IMPORTANT: The BMC saves all changes upon exit of a menu, so any changes

made will be saved, even when the “CANCEL” button is used to back out of a

menu or sub menu. See the Software See the “Software Features” section on

page 8 and 9 for more information.

13. Volume Control Knob - Turn to control overall nominal system gain from

-50 dB to 0 dB, in .5dB increments. Turning this knob will cancel the system

MUTE and REF gain operations. Turning this knob while in the menus will

temporarily override the menu operation to adjust the system gain. Once knob

is released, the menu will be reactivated.

SELECT CANCEL

bass management controller Remote

YES

MUTE

REF

MK II

MENU GAIN

SUB

LS RS

REV 2.00

BLUE SKY INT

Main Aux

11 12 13

Page 7

6. System Gain, Sub Offset and Level Overview

System Electrical Gain

The input stage of BMC MK II is designed for a maximum input level of +24dBu

(balanced or unbalanced) before clipping. The output stage will also drive

a balanced 10K Ohm load to a maximum of +24dBu. However, because the

BMC can add up to +6dB of gain to a channel to balance the system, there

are situations where the BMC will clip. For example you cannot take a +24dBu

input, set the system gain at 0dB, add +6dB of calibration gain to the signal

and get +30dBu on the output. The output ampliﬁers in the BMC will clip under

these conditions.

In order to reduce the possibility of clipping the bass / LFE summation

output buss, the BMC MK II also offers a 0dB / -10dB “SUB GAIN” pad feature.

Controlled via the remote, and located in the CAL CHANNELS menu (pictured

below - see the “Software Features” section on page 8 and 9 for more

information), this feature allows the user to add a -10dB “pad” on the SUB

summation / output buss.

Although this may seem to be a limitation, in practice it is not. The Blue Sky

monitors, like most ampliﬁed monitors, have relatively high voltage sensitivity.

Therefore, there is quite a bit of ﬂexibility in setting gains.

For the best signal to noise ratio and to minimize noise and hum pickup, the

BMC should be driven with as high a signal level as possible. The output signal

going to the monitors should be kept relatively high and if necessary signals

should be attenuated at the monitors.

Calibration / Level Trims

The individual channel level trims (+/- 6dB) in the BMC MK II, are “OUTPUT”

channel level trims, and are used to adjust the relative level between the SUB

and SAT in .5 dB increments. The reason this fact is important is because in

certain applications, such as in a ﬁlm setup where the surrounds may need to

be at a lower level as compared to the front speakers, the level adjustments

for the surrounds must be done before the signal hits the BMC MK II. This

is because if you adjust the surround level only with the BMC main channel

output level trims (main channels = L, C, R, LS & RS), the SUB and SURROUND

level may not match.

1. Although the system will startup without the BMC remote being connected,

in order to calibrate the system and gain full access to all of the BMC MK II’s

features, the BMC remote must be connected to the I/O unit(s). Once the

system has been calibrated, the remote can be disconnected and the main

I/O unit will retain all the setup information. Once the systems’ power is

cycled, the main I/O unit will power up fully calibrated and at the “reference”

position. See the “Software Features” section on page 8 and the “5.1 System

Calibration” section on page 12 for more information.

2. The startup sequence is activated when ever a remote is connected to the

I/O unit or when the power is cycled with the remote connected. The power

up sequence is as follows -

A: The LEDs may ﬂash momentarily as the remote receives power

from the main I/O unit. The power LED on the front of the I/O

unit(s) should be lit.

B: Within the I/O unit(s) the output relays will click on.

C: The LCD will display the current software version for 5 seconds.

D: After the system has been fully activated the system will go into

the mute mode and the display will show the following message.

BMC MK II Power Up Sequence

REMOTE

CONNECTED?

LOAD

LASTSTATE

REFGAIN

WAITFOR

INSTRUCTIONS

FROMREMOTE

POWER UP

YES

7. BMC MK II Power Up Sequence

Page 8

As mentioned in previous sections in this manual, the BMC MK II has two

distinct operating modes - “USER MODE” and “SETUP MODE”. Below

is a quick oveview of some of the basic guidlines for the operation of

the BMC in these modes. On the opisiste page you will ﬁnd a software

ﬂowchart detailing the operation of all the “SETUP mode” functions.

USER MODE

MUTE FUNCTION: Once the BMC MK II has been powered up, the system

will start in user mode by default, with the MUTE function engaged. You will

notice the display reads SYSTEM MUTE (as shown below) and that the MUTE

LED is ON.

Turning the volume control knob, pressing the mute button, or pressing the

reference button will bring the system out of MUTE.

SOLO FUNCTION: Each of the output channels (not input channels) can

be individually soloed. This can be accomplished by pressing each of the

multifunction buttons on the remote (marked L, C, R, LS, RS & SUB). When

a second I/O unit is connected, the solo function for the second set of 5.1

channels can be activated by holding each of the respective buttons down

for 2 seconds. Solo can be cancelled by doing any of the following; repeating

the same action, activating the solo function on another channel, muting the

system, or by pressing the “REF” / reference button. When a channel is in

SOLO mode, the display will show which channel has been activated (shown

below) and the MUTE LED will ﬂash. PLEASE NOTE: As in the example below,

each channel on I/O unit 1 is labeled “1’ (CENTER 1 in this example). If a

second I/O unit is connected and the CENTER on the second I/O unit is in

SOLO mode, the display will read SOLO CENTER 2.

REF (REFERENCE) LEVEL FUNCTION: The REF button on the remote toggles the

system in and out of the reference gain setting. The reference gain setting is a

predetermined level, which can changed or set in the “SETUP MODE” (SETUP

MENU). Moving the master gain control knob, pressing mute, or pressing the

REF button again will bring the system out of the reference setting. When the

REF function has been activated the REF LED will be ON and the display will

show “REF GAIN” and then state what that GAIN possition is (-10dB in the

example below).

For more information about how to detirmine the optimum “reference”

level setting please follow the cablibration procedures, in the “5.1 System

Calibration” sectioins on page 12.

SETUP MODE (see ﬂowchart on the opiste page for a detailed overview)

ENTERING SETUP MODE: To enter setup mode, please ensure that you are

not in REF or MUTE MODE. Then press and hold down the SELECT button for

5 seocnds. Release the button and you will now be in “SETUP MODE”. The

display will read PRESET MENU, as shown below.

NAVIGATING THROUGH THE MENUS: Pressing the SELECT key will move

you through the 4 main SETUP menus. These menus include “PRESET MENU”

(shown above), “CAL CHANNELS”, “SETUP” and “MUTE CHANNELS”, as shown

below.

NAVIGATION WITHIN A MENU: The up and down arrow keys in the MENU

section on the remote are used to scroll through the various sub menus within

each of the main menus.

ADJUSTING PARAMETERS: To adjust parameters within the CAL CHANNELS,

SETUP and MUTE CHANNELS sub menus, use the “+” and “-” buttons on the

remote. An example of this is shown below, where within the “RIGHT 1”

channel gain submenu, the level can be adjusted up or down using the + and

- keys (.5dB incriments).

Within the PRESET MENU / CHANGE NAME submenu the “+” and “-” buttons

are used to move left or right, to select the speciﬁc character which you want

to change. Letters and numbers can be scrolled by using the up and down

arrow buttons on the GAIN SECTION of the remote (also marked REF and

MUTE).

CANCEL: The cancel button is used to exit out of the “SETUP MODE” and

to return back to “USER MODE”. Please note that the BMC MK II saves all

changes upon exit of a menu, so any changes made will be saved, even

when the “CANCEL” button is used to back out of a menu or sub menu.

8. Software Features

Page 9

PRESET

CHANGE

NAME ?

INCREASE

LETTER

DECREASE

LETTER

MUTE

RSUR

NO/YES

LSUR

NO/YES

RIGHT

NO/YES

CENTER

NO/YES

SUB

NO/YES

LEFT

NO/YES

SELECT

MOVE CURSOR

LEFT

MUTE

REF

INCREASE

LETTER

DECREASE

LETTER

MUTE

REF

MOVE CURSOR

RIGHT

SELECT

CANCEL

SELECT

HOLD SELECT FOR 5 SEC

PRESET 2

LOAD /YES?

PRESET 3

LOAD /YES?

PRESET 1

LOAD / YES?

PRESET 4

LOAD /YES?

CAL

SUB 1

-6/6 dB

LFE 1

0/10 dB

SET

REF

GAIN

BASS

MANAGER

SELECT

SETUP

80 HZ HIGH

PASS

120 HZ

LOWPASS

LFE FILTER

BASS SUM

YES

ADJUST

GAIN

CONTROL

YES

STORE

80 HZ HIGH

PASS

OUT

120 HZ

LOWPASS

LFE FILTER

OUT

BASS SUM

OFF

2ND

BOX

NO YES

RIGHT 2

-6/6 dB

SUB 2

-6/6 dB

LFE 2

0/10 dB

SUB 2

OFFSET

0/ -10 dB

SUB 1

OFFSET

0/ -10 dB

RIGHT 1

-6/6 dB

RSUR 1

-6/6 dB

LSUR 1

-6/6 dB

LEFT 1

-6/6 dB

CENTER 1

-6/6 dB

LEFT 2

-6/6 dB

CENTER 2

-6/6 dB

RSUR 2

-6/6 dB

LSUR 2

-6/6 dB

UP ARROW UP ARROW

UP ARROW

UP ARROW UP ARROW

PRESET MENU: The BMC MK II has a total of 4 presets available. The presets

store all level and calibration settings for the BMC, along with preset name, SUB

level offset, bass-management IN / OUT and LFE GAIN. The main display will

always display what PRESET is in current menu when in USER MODE and when

not in MUTE, REF or SOLO mode, as shown below (in this case PRESET 1).

Whenever you are in the SETUP MODE editing settings such as LEVEL, these

settings are being applied to the current PRESET in memory. Within the PRESET

sub menus, you can change the name of the preset which is currently loaded

in memory (as shown on the bottom of page 8). To load another preset

use the up and down arrow buttons, on MENU section of the remote scroll

through the various presets. Within the PRESET menu and when you get to

the proﬁle that is already loaded in memory, the display will state that it is

“LOADED” (shown below).

When you scroll through the other proﬁles, it will ask you if you want to load

the selected proﬁle (show below). Press the YES button to load this proﬁle.

SETUP MODE OVERVIEW

Page 10

Satellite Speaker Placement - MUSIC

The recommended monitoring angle for proper stereo imaging with music is

60 degrees between the left and right speakers. The center channel speaker

should be located on axis with the reference monitoring position and both the

left and right surround channel speakers should be at an angle of 110 degrees

from the center line. In most applications, surrounds used for music are placed

at the same height as the front speakers for a direct sound ﬁeld. See Figure 1

Satellite Speaker Placement - FILM / POST PRODUCTION

Although the above recommendations should work equally well for both ﬁlm

and music production, there may be situations where a more “ﬁlm” optimized

setup is desirable. To correctly relate audio to picture, the recommended

angle between left and right speakers is 45 degrees. This narrower monitoring

angle should still yield a very satisfactory stereo image. As with the “music”

setup, the center channel speaker, should still be located on axis with the

reference monitoring position. Unlike music surrounds, which tend to be

direct in nature, ﬁlm surrounds are usually positioned for a more diffused

sound ﬁeld, to simulate the effect of an array of surround speakers used in a

theater. For a single pair of surrounds, this can be accomplished by placing

them two feet above seated ear height, to the side of the monitoring position

and slightly behind the mix position. For larger rooms, it may also be desirable

to use multiple surround speakers as an “array”.

Satellite Speaker Monitoring Height Recommendations

It is recommended that all of the satellite speakers be placed at or about seated

ear height, as shown in Figure 2. If it is not possible to place the speakers at or

about seated ear height, please aim the speakers at the monitoring position.

Subwoofer Speaker Placement

Although you have great ﬂexibility in positioning a subwoofer, a good starting

point is centered between the left and right satellite speakers. This could be

under the console, behind the console, etc. Placing the subwoofer closer to a

corner or wall will increase acoustic efﬁciency and may yield better acoustic

response in many situations. However, because of the many variables that relate

to “in-room” subwoofer performance, we highly recommend experimenting

with subwoofer placement. Visit www.abluesky.com/subplacement for more

detailed and speciﬁc recommendations.

Speaker placement recommendations, with regard to these types

of installations, vary greatly on the end users’ goals and surround

philosophy. For more speciﬁc information regarding your particular

installation, please do not hesitate to contact Blue Sky directly.

www.abluesky.com

9. 5.1 Speaker Placement

30°

110°

R S

D = B

Reference Monitoring Position

SPEAKER PLACEMENT AS DOCUMENTED IN

RECOMMENDATION ITU-R BS.775-1

Figure 1

MONITORING HEIGHT

RECOMMENDATIONS

Center of the woofer

Center of the tweeter

Mid-point of the woofer and tweeter

Figure 2

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