Sound Blaster MP3 Player Speaker, Black 51MF8170AA005 Manuale Utente

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

10/7/2014 P

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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).