Jamo R 909 Sound Catalogue - 2011 - English - Page 62

2½-way This unique configuration combines the best of two- and three-way systems; the coherent and easy-flowing sound reproduction of a twoway system, with the extended bass response and power handling of a three-way system. This is done by configuring the two-way system to reproduce the full frequency range and then using an additional woofer to augment low bass performance, a region where only greater cone area can move extra air and handle the extra power. Convex tapered vent When playing loud, the speed of the air in the bass reflex port can create sonic colouration via turbulence which is why the design of the ports is highly critical. The carefully symmetrical, flared design (convex shape) of the Jamo bass reflex port ensures an optimised airflow that minimizes port noise. Actually, this design allows the speaker to generate 5dB of extra SPL before any port noise occurs! Active Impedance Correction Active Impedance Compensation (AIC) is an innovative extension of former known ways of reducing distortion in electrodynamic loudspeaker drivers. The effect of AIC is a clearer midrange with a markedly reduced roughness, especially noticeable on voice reproduction. In figures, this amounts to a reduction of third order harmonic distortion in the order of 6dB (= 50% reduction). Auto on/off This feature automatically switches the subwoofer on when it receives a sound input signal and sets it in stand-by again after approximately 20 minutes without an input signal. So, basically this allows you to forget all about the subwoofer once it is connected. Boundary Gain Compensation The Boundary Gain Compensation filter compensates for the room influence at low frequencies, as any room amplifies the lowest frequencies. The magnitude of the room's amplification depends on the room size and where you are positioned in the room. Normally, it increases the closer you get to a wall. This can result in too high a bass level from approx. 60Hz and increasing downwards - in the range between 20-30Hz it peaks up to 5-10dB in an average room! At first this could sound really impressive, but the sound quickly begins to sound 'boomy', especially when listening to music, and rather annoying. So the Boundary Gain Compensation ensures a very linear in-room bass response and gives you more flexibility when it comes to placement and choosing your favourite listening position. Cut-off frequency Continuously variable level, phase and cut-off frequency controls make it easy to tune the subwoofer to integrate with virtually any speaker on the market, as well as allowing different placements and personal preferences. Dipolar Dipolar means the sound is distributed from both the front and rear of the speaker - in opposite phase. The reason for using dipolar surround speakers is that you should not be able to pinpoint their physical location; on the contrary, they should add a '3D' ambience to the surround effects, making you feel part of the action. A dipolar front speaker's sound radiation will emerge from the back and bounce from the rear and side wall before reaching your ears, creating a slight delay in the sound from the front and back. The 2nd order reflections adds ambience and gives you the impression of a much larger room. A dipolar front speaker is to be angled in slightly from the rear wall. Due to the angling the rear sound will be bouncing off two boundaries before reaching your ears. The reflections add ambience and gives you the impression of a much larger room. DivX DivX is to movies what MP3 is to music - Thanks to very efficient compression algorithms, a full movie can be stored on just one CD-ROM. Centre-Plug The Centre-Plug replaces the traditional dust cap, making the cone lighter and faster. This also prevents sonic break-up as well as pressure swings behind the dust cap as the cone moves, resulting in more dynamic and precise sound reproduction. The Centre-Plug cools the voice coil, providing increased power handling capability and stable sound reproduction, no matter how loud you play. Co-axial drive unit The co-axial drive unit (a tweeter integrated into the mid/woofer) ensures the same acoustic centre for the two drivers and thus the treble and bass frequencies reach your ears in correct acoustic phase (simultaneously) regardless of whether or not your listening position is off-axis - horizontally or vertically. Dolby Virtual Surround Dolby Virtual Surround Dolby® Virtual Surround technology simulates a highly realistic 5.1-speaker surround sound listening environment from as few as two speakers, making it an ideal technology for digital TVs, stereo minisystems, PCs, and a variety of consumer audio/visual products. Dolby Virtual Speaker technology also creates a wider two-channel environment during playback of stereo CDs and MP3s, and when combined with Dolby Pro Logic® II processing, (for example, in an audio/video receiver or PC), delivers a virtual surround listening experience from any high-quality stereo source. DTT (Decoupled Tweeter Technology) One of the biggest challenges when designing speakers is dealing with unwanted cabinet vibration. Our solution is Decoupled Tweeter Technology (DTT). By decoupling the tweeter from the rest of the loudspeaker, vibrations transmitted from the front baffle to the tweeter are reduced by more than 20dB. The result is an uncommonly detailed and realistic reproduction of high frequencies. 62