Creative Sound Blaster Roar SR20A Guide d'installation

Sound Blaster Roar SR20A White Paper – Evolution, Concept and Tech Overview

10/7/2014 PAGE 1 OF 20

Sound Blaster ROAR

SR20A

White Paper

Evolution, Concept and

Technology Overview

Version 1.12

July 2014

Corporate Headquarters

Creative Technology Ltd.

31 International Business Park

Creative Resource

Singapore 609921

Tel: +(65) 6895 4000

Fax: +(65) 6895 4999

Creative website: www.creative.com

This document is provided for background reference. It may not be reproduced

trademarks of Creative Technology Ltd in the United States and/or other countries. The Bluetooth®word mark and

logos are owned by the Bluetooth SIG, Inc. and any use of such marks by Creative Technology Ltd is under license.

aptX®is a trademark of CSR plc. microSDHC Logo is a trademark of SD-3C, LLC. All other trademarks are the

property of their respective owners and are hereby recognized as such. All specifications are subject to change without

notice. Actual contents may differ slightly from those pictured. Use of this product is subject to a limited warranty.

Sound Blaster Roar SR20A White Paper – Evolution, Concept and Tech Overview

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Sound Blaster Roar: A Study in Purpose-built

Perfection

When it comes to designing the perfect music system -- be it a sound system for the

living room, speakers for a mixing studio, or a near-field desktop system -- the most

important thing is its musicality.

This means that the speaker is faithful to the original source and reproduces audio where

Timbre and Tonality is not altered from the original source in any way. Ultimately

musicality is not dissecting, nor changing the sound, but a total cohesive presentation that

puts every element of the sonic fabric together as it was reproduced originally.

Simply put, a good speaker system – due to its ability to accurately reproduce the original

source – enables listeners to achieve oneness with the music being played. That in a

nutshell is what we have set-out to achieve with the Sound Blaster Roar SR20A.

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Main Design Considerations

Through our many years of research in one-piece speaker systems, and countless in-

house research projects in our sound laboratories and listening rooms, Creative has

identified key usage patterns in the portable speaker category. We have also narrowed

down some major pitfalls in the design of today’s portable speaker.

Here are our findings:

1. Portable speakers are used both ‘near-field’ (meaning at the desk or on a bed) and

‘mid-far field’ (when used as a main stereo system in a studio apartment or at a

party or on a picnic)

2. Portable speakers are used when the listener is (most of the time) NOT at the

acoustical axis, meaning they are either standing up or walking around or using it

mostly for ambient or background music.

3. Portable speakers are often used and listened to (played back) at mid to soft

volume levels. In this case most designs lack “bass” when played at these levels.

4. Portable speakers are often impulse purchases (via heavy discount, brand hype or

for its industrial design), with sound quality being the lowest consideration. Most

portables have such poor fidelity; they hardly suffice to provide decent sound for

a bedroom.

As a result of these observations, we set out to configure and incorporate the following

design elements into a portable speaker that would excel in the portable speaker category:

1. Bi-Amplified Design -- Two Amps, Not One

Most portable speakers have a passive radiator -- meaning, it is not powered.

With this approach the passive system’s single amplifier must reproduce the

whole audio spectrum; low frequencies rapidly “use up” the amp’s headroom.

As higher frequencies ride along on lower frequency waveforms, they can be

distorted even when the high frequencies themselves will not be clipping. Having

two amps as opposed to one, the amp is free to drive each speaker to its safe

maximum limit and efficiency. It also allows greater power management of high

and low frequency. At lower volume playback bass is still evident. System also

plays louder without losing too much bass (common in many other portables).

Sound Blaster Roar SR20A White Paper – Evolution, Concept and Tech Overview

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Passive conventional vs. Active or Bi-Amplified

2. ‘Boxer-Style’ Low Centre of Gravity Design

Unlike top-heavy, front/rear-designed speakers that vibrate and move out of

position at high volumes, the Sound Blaster Roar is designed to be remarkably

stable with its low centre of gravity.

The dual opposing radiators produces equivalent counter-forces, this symmetry of

force prevents the unit from moving during extreme driver excursions.

The top firing “active” driver which incidentally also moves the “most” is backed

by the base of the unit and by the surface on which the unit is resting. The rear

forces of the active driver are then distributed to the dual radiators. This three-

action” pisotonic approach provides a very stable platform for a bass module.

Conventional active/passive approach has the active driver firing is one direction

with passive drivers firing to the rear produces uneven forces. This together with

the “top-heavy” and small footprint design causes the speaker system to move.

On bass heavy or loud playback the product may tend to “move”.

Boxer Bass Module Conventional Design

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3. Space-Filling Dispersion

Dispersion which refers the throw of sound into its acoustic space is a very

important factor in reproducing spacious sound for a loudspeaker system. For a

one-piece speaker system, it is always a challenge to deliver a convincing “stereo”

stage, width, depth and even height of conventional 2-piece speakers. Most one-

piece speakers systems tend to sound “boxed –in “, and point-sourced” thereby

lacking in stereo width and depth.

With SR20A‘s five driver approach, the front left /right drivers disperse

frequencies forward, the active bass unit disperses less sweet spot-dependant

midrange upwards for height while both side firing radiators delivers “space-

filling” bass, this creates a holosonic soundscape enabling improved width, height

and depth while preserving the stereo focus.

Sound Blaster Roar SR20A White Paper – Evolution, Concept and Tech Overview

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Components and Supporting Technologies

The Sound Blaster Roar SR20A comes with the following components and technologies

that allow the loudspeaker to punch well above its weight in the wireless speaker

category:

Far-field Dual Left-Right Channel Satellite Drivers

The Sound Blaster Roar SR20A delivers highly detailed highs. This is due to the

inclusion of dual 1.5” high frequency drivers that are made for ‘Far-field’ high-frequency

dispersion. These drivers feature a Kapton voice coil former with excellent dielectric

properties for improved thermal handling. ‘Far-field’ here refers to the driver’s ability to

“throw” sound further than competing portable speaker systems (not on the context of a

full blown professional monitor).

Bass/Midbass Driver

The Long-throw 2.5” heavy duty midrange/bass driver – that features rubber surrounds

with ideal flex properties -- is used for midbass bass duties for the SR20A.

Bluetooth 3.0

The SR20A features Bluetooth 3.0 wireless technology. This has all to do with the new

way we live, work and play. Bluetooth wireless technology is aimed at allowing users to

make effortless and fast connections between various devices.

Bluetooth wireless technology’s adaptive frequency hopping (AFH) capability was

designed to reduce interference between wireless technologies sharing the 2.4GHz

spectrum. AFH works within the spectrum to take advantage of the available frequency.

This is done by detecting other devices in the spectrum and avoiding the frequencies they

are using.

Range:

Operating range is typically 10 meters or 30 feet.

Data rates:

Up to 3Mbps.

Also Bluetooth’s high adoption rate enables very wide compatibility.

Sound Blaster Roar SR20A White Paper – Evolution, Concept and Tech Overview

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AptX Codec Support

What is aptX? Originally developed for use in the professional audio and broadcasting

sectors, aptX is a real-time digital audio data reduction system that compresses linear

audio samples by a factor of 4:1 with no perceptible audible degradation and with

negligible delay.

Why aptX? To manage the transfer of stereo audio, the Bluetooth Special Interest Group

(SIG) has ratified a profile known as A2DP (Advanced Audio Distribution Profile).

Bluetooth stipulates maximum available bandwidth for A2DP at 768kbps. So for high

quality stereo music, it is necessary to use some form of audio coding to reduce the

required data rates.

Take for example, a 16-bit stereo (regarded as entry level for audio systems) with a

minimum sample rate of 44.1 kHz to match the venerable audio CD:

Dynamic Range:

16 Bit Digital Audio = 20Log10 (216) = 96.32 dB

20 Bit = 120.4 dB etc….

Taking CD quality as the benchmark, 16-bit, 44.1 kHz has a dynamic range of 96dB.

To achieve this level of dynamic range in bandwidth limited applications, it will be

necessary to use at least 16-bit audio as the raw input and then a compression technology

that can reproduce virtually all the dynamic range at the output.

Uncompressed audio utilizes a bandwidth of 1.411Mbps for CD quality and for the vast

majority of wireless applications, full bandwidth is simply impractical. Issues of design,

efficiency, power optimization and error resilience will all put pressure on available data

rates.

AptX uses advanced ADPCM principles which encode the entire frequency range of the

audio. MP3 uses psychoacoustic techniques, which throw away audio they deem

unimportant, SBC reproduces limited audio bandwidth.

So what is the bandwith of aptX? Here’s the breakdown:

CD 16 bit /44.1kHz 20Hz- 22kHz

aptX 20Hz-22kHz

SBC 20Hz-17kHz

Sound Blaster Roar SR20A White Paper – Evolution, Concept and Tech Overview

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AAC Content Support

AAC (Advanced Audio Coding) is the default file format on the iPhone, iPodTM and the

iTunesTM software, and for downloads from the Apple iTunes store. The compression

scheme it uses is better than that of MP3, and AAC can better render the higher

frequencies produced by certain musical instruments and by the human voice. With AAC,

you get richer audio.

Sound Blaster Roar SR20A White Paper – Evolution, Concept and Tech Overview

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Sound Tuning or Voicing -- It’s All about Sound Quality

Most Portable loudspeakers today are “clones”. Cheap plastic knock-offs that share the

same generic design and are re-badged, re-shelled from a common contract manufacturer.

So as long as it looks good, nobody cares.

Tuning: From the Sonic Soul of our In House reference systems

Built as a research project, our in-house reference systems are benchmarked to some of

the most exotic playback systems. With a key goal of attaining accuracy with musicality,

the system is continuously tuned and tweaked for best objective accuracy and subjective

“musical” results.

Our high performance Gigaworks T3 and the latest Signature series T4 Wireless lineup

shares similar intrinsic tonal characteristics with striking accuracy AND musicality.

Though the SR20A is a portable wireless system, the in-house system serves to provide a

guiding “voice”. Smooth tonal balance with detailed vocals, tight rhythmic midbass and

full spectral bass

There were multiple iterations before we could get the right tuning for the SR20A.

Catch every word in any music with full warm midrange and detailed tight bass.

HM-8 FRONT VIEW HM-8 REAR VIEW

In-House reference Powered High resolution Active speaker HM-8

Sound Blaster Roar SR20A White Paper – Evolution, Concept and Tech Overview

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PA-1 FRONT VIEW

PA-1 REAR VIEW

In House reference Pre-Amplifier PA-1

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