Infrasonic BLOW5D User manual

BI-AMPLIFIED

STUDIO MONITOR

INFRASONIC BLOW SERIES

Premium Digital Module BLOW5D

User’s Manual

Ver.1.00 April 2007

BLOW5/BLOW5D User’s Manual

ARNING :

TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS

APPARATUS TO RAIN OR MOISTURE.

CAUTION :

TO REDUCE THE RISK OF

ELECTRIC SHOCK, DO NOT

REMOVE COVER (OR BACK).

NO USER-SERVICEABLE

PARTS INSIDE. REFER

SERVICING TO QUALIFIED

SERVICE PERSONNEL.

The lightning flash with the arrowhead symbol within an

equilateral triangle is intended to alert the user to the

presence of uninsulated “dangerous voltage” within the

product’s enclosure that may be sufficient magnitude to

constitute a risk of electric shock to persons.

The exclamation point within an equilateral triangle is intended to alert the user to the presence

of important operating and maintenance (servicing) instructions in the literature accompanying

the product.

IMPORTANT SAFETY INSTRUCTIONS

1. Read these instructions.

2. Keep these instructions.

3. Heed all warnings.

4. Follow all instructions.

5. Do not use this device near water.

6. Unplug the device before cleaning. Clean only with a dry cloth.

7. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus

(including amplifiers) that produce heat.

8. The device should be installed so that its location or position does not interfere with its proper

ventilation. For example, it should not be situated on a bed, sofa, rug or similar surface that may

block the ventilation openings; or placed in a built-in installation, such as a bookcase or cabinet,

that may impede the flow of air through its ventilation openings and around the unit.

9. The device should be connected to a power supply outlet compatible with the voltage and frequency

marked on its rear panel.

10. Protect the power cord from being walked on or pinched. Particularly the plugs, extension cords, and

the point at which they exit the unit.

11. The power cord of the device should be unplugged from wall outlet during lightning storms or when

it is to be unused for a long period of time.

12. Do not attempt to service this device yourself. Refer all servicing to a qualified

service technician. User attempting to service unit or use unauthorized parts may

result in fire, electric shock or other hazards. This will also void the warranty.

13. Never use with a cart, stand, tripod, bracket, or table except as specified by the

manufacturer, or sold with the apparatus. When a cart is used, use caution when

moving the cart/apparatus combination to avoid injury from tip-over.

BLOW5/BLOW5D User’s Manual

INTRODUCTION

Thank you for purchasing BLOW5!

Before using this gear, please carefully read the ‘CAUTION’, and ‘SAFETY’ sections and the boxed out

‘IMPORTANT NOTE’ sections. These sections provide important information for the proper operation of the unit.

And, in order for you to get a better monitoring experience, the user’s manual should be read entirely. This

manual is intended to familiarize you with all the control elements of the BLOW5 speakers. This unit handled

correctly, will give you high quality sound, and a great listening experience for years to come.

BLOW5 powered near field studio monitoring speaker features a two-way, bi-amplifier designed to achieve high

quality sound. The frequency response is broadened downward by using the bass reflex system, and

broadened upward by a natural silk dome tweeter. Together they provide very delicate signal reproduction. The

speakers wide frequency response is also due in part to the design of it’s enclosure.

The analog input connector provides for an XLR balanced input and a TRS 1/4” phone jack balanced or

unbalanced input.

BLOW5 also has its optional DA-912 digital input connector. This connection provides the AES/EBU XLR input,

S/PDIF RCA input and RCA thru output. It supports a 192 kHz sample rate at a 24-bit resolution as well as a

high-end D/A converter with 123 dB dynamic range.

You can also adapt BLOW5 to your control room acoustics by the select controls on the back panel. As you set

the units for your ears, they will prove to be more accurate than any other monitoring speaker.

From professional users in commercial studios to home studio owners, BLOW5 is the true advanced solution

for near field studio monitoring in its class.

INDEX

1. Main Features ...................................................................................................................... 3

1.1. BLOW5 .............................................................................................................................. 4

1.2. DA-912 (included in BLOW5D)....................................................................................... 4

2. PANEL DESCRIPTIONS ...................................................................................................... 5

2.1 Front View.......................................................................................................................... 5

2.2 Rear View........................................................................................................................... 6

2.3. DA-912 (included in BLOW5D)....................................................................................... 7

3. INSTALLATION .................................................................................................................... 8

3.1. Positioning Speakers ....................................................................................................... 8

3.2. Adapting the BLOW5 to the room acoustics ................................................................. 9

4. CONNECTION...................................................................................................................... 11

4.1. Powering Up ................................................................................................................... 11

4.2. Analog Audio Input........................................................................................................ 11

4.3. Digital Audio Input (included in BLOW5D).................................................................. 12

5. SPECIFICATIONS .............................................................................................................. 13

5.1. BLOW5 ............................................................................................................................ 13

5.2. DA-912............................................................................................................................ 14

6. END USERS WARRANTY .................................................................................................. 15

BLOW5/BLOW5D User’s Manual

1. Main Features

1.1. BLOW5

2-way bass-reflex bi-amplified 5 inch near field studio monitor

Flat frequency response (±1.5 dB, 58 Hz to 20 kHz) and wide pass-band frequency (50Hz ~

22kHz)

90 watt (40 watt HF and 50 watt LF) Full discrete power amplifiers with servo-loop and perfect

protections.

0.75" natural silk dome High frequency transducer

5.25" Polymer coated paper fiber cone low frequency transducer

Full magnetic shielded enclosure and independent amplifier room

XLR and 1/4"TRS phone jack balanced/unbalanced inputs

EASC (Enhanced Acoustic System Compensation) Technology

Input sensitivity control

High frequency 3-step tilt controls switch

Acoustic space control switch

Bass cut-off frequency control switch

5th order active crossover network

Front Illuminant Logo lamp and protection indicator

High-strength cabinet constructed MDF composite with radius edges

1.2. DA-912 (INCLUDED IN BLOW5D)

XLR for AES/EBU (IEC60958) and RCA for S/PDIF coaxial digital inputs

RCA thru out port for stereo connection

IEC60958 EIAJ CP1201 compatible 24-bit digital input with up to 192kHz sample-rate

High-end 24-bit/192kHz D/A converter with 123dB dynamic range

XLR/RCA source and Left/Right channel selection switch

BLOW5/BLOW5D User’s Manual

2. PANEL DESCRIPTIONS

2.1 FRONT VIEW

(1) 0.75” natural silk dome High Frequency Transducer

(2) 5.25" Polymer coated paper fiber cone low frequency Transducer

(3) Front Illuminant Logo Lamp and Protection Indicator

The white Lamp means that the unit is on normal operation mode.

The red Indicator stands for the protection mode.

(4) Slotted Bass-reflex Port

BLOW5/BLOW5D User’s Manual

2.2 REAR VIEW

Digital Module

Pre-Amplifier Module

Power Amplifier Module

(5) High Frequency Tilt Control

You can adjust the treble tilt of the unit

by selecting from 3 steps (-2dB, Flat,

2dB @3.0 kHz)

(6) Room Compensation Control

This switch reduces low frequency level

in steps of -2dB for room acoustics. You

can select switches depending on

distance from speakers to the wall.

(7) Cut-off Low Frequency Control

You can select the cut-off to reduce the

level of low frequency for a subwoofer

system. There are 3 selections; Flat,

80Hz and 100Hz.

(1) Power On/Off Switch and AC Inlet

Use to power on or off the unit.

(2) Analog Inputs

XLR input and 1/4” TRS Balanced input Connector.

(Impedance 20kΩ) BLOW5 accepts balanced and

unbalanced connections.

(3) Input Source Select Switch

You can select digital or analog input source.

(4) Input Sensitivity Control

Use the Sensitivity Control to set the proper input

level from the sound source. The control range is

+22dBu at control min and -9dBu at control max.

Marking positions are -7.8dBu and +4dBu. You

should refer to the manual for sound source

connecting to the input of BLOW5.

BLOW5/BLOW5D User’s Manual

2.3. DA-912 (INCLUDED IN BLOW5D)

(1) AES/EBU Digital Input Connector

(2) S/PDIF Coaxial Input Connector

XLR for AES/EBU and RCA for S/PDIF coaxial digital input connector.

(24-bit/192kHz)

<Note> DO NOT try to use Coaxial input for analog audio signals.

(3) Source Select Control Switch

You can select the type of input between AES/EBU (XLR) and S/PDIF (Coaxial).

(4) Digital Thru out Connector

Connect from the one speaker unit to the other through a RCA cable.

(5) Channel Select Control Switch

You can select the playback channel according to the position of each unit in stereo

(6) Status indicator LED

132465

BLOW5/BLOW5D User’s Manual

3. INSTALLATION

3.1. POSITIONING SPEAKERS

IMPORTANT NOTES

Be careful not to grab or touch the speakers when in use. Damage may occur.

Do not put anything on the unit.

When the speaker is in operation. The heat sink in the rear side will be hot.

Take care not to touch it.

The heat sink which is behind of unit is sharp. You can be harmed with it. Be careful to handle it

Positioning monitor speakers correctly in the control room is very important to their performance. In order

to monitor with your speaker units at their maximum capability, appropriate listening environment and

correct placement are required. Please see our suggestions.

Two speaker units and the listener

should align to form a regular triangle.

Refer to the following diagram.

The height of the units - The top of the

woofer should come up inline with your

ears, in your listening environment.

(Refer to the following diagram.)

< Height of unit >

< Positioning >

BLOW5/BLOW5D User’s Manual

3.2. ADAPTING THE BLOW5 TO THE ROOM ACOUSTICS

Generally there are many factors affecting the monitoring of sound. For example, room size, distance from

the wall, size of studio space, the reflection of the room, and the distance between speakers and user. In a

multi-channel monitoring system like 5.1 surround or THX, a subwoofer is included in the system to produce

low frequency effect. So it may be necessary to reduce the low frequency level of the monitoring speakers.

Because of these various situations, the BLOW5 is able to be optimized to make the best of your monitoring

environment.

IMPORTANT NOTES

DO NOT place any obstacles that may block the flow of air. Air is the medium of sound. Refrain from using

reflective surfaces near the speakers. IE - glass, mirror or metal. PLACE THOSE MATERIALS AWAY FROM

THE SONIC PATH OF THE SPEAKERS.

Input Sensitivity Control

There are many types of devices to connect to the BLOW5. The unit can be set to correspond with the

varying impedances of third party devices. You can set the sensitivity to match with various kinds of input

sources. A visible scale/dB mark on the sensitivity control assists users in the correct setting.

Follow diagram shows input level scales. (Sound pressure level of output is 100dB.)

High Frequency Tilt Control

This switch adapts the BLOW5’s frequency

response to the dampening characteristics of the

control room. It tailors the overall high-frequency

response by beginning at 1.0 kHz, ±2 dB at about

10 kHz. You can use this switch to adjust

brightness of your speakers. It depends on room

conditions and the distance of speakers from the

user. The following graph shows how the treble tilt

affects the response of speakers.

Consumer or Mobile

Devices

Professional (+4dBu)

Devices

Semi-pro (-10dBv)

Devices

BLOW5/BLOW5D User’s Manual

Room Compensation Control

If you’ve placed speakers close to the wall or in a

corner, you’ll be hearing too much loud low frequency

level. In the case of some studios, there is bass-trap

for reducing the low frequency level. The Room

Compensation Control allows you to lower the bass

range depending on the room acoustics. You can

select the switch to reduce low frequency level in 3

steps of -2dB below 500 Hz. The following graph

shows how Room Compensation Control affects the

response of the speakers.

Cut-off Low Frequency Control

You can use this switch to adjust the bass roll-off in a

multi-channel surround system, or to balance your

room resonance. A subwoofer makes a deep, low

frequency sound.

You can mix how a sub and BLOW5 harmonize using

the Cut-off Low Frequency Control. Flat, -80Hz

and -100Hz are the selections.

The graph shows how the Cut-off Low Frequency

Control affects the bass response of the speakers.

FREE FIELD

0dB WALL

-2dB CORNER

-4dB

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