Turbosound LMS-D24, LMS-D26, LMS-D6 - page 38

user manual

TA-890

TA-890 user manual

Page 38

Turbobass Directivity

The Aspect series TA-890L bass bin and the TSW-218 subwoofer are “Turbobass” devices,

comprising horn-loaded drivers. Whilst this horn loading does aid in tuning the device and

adding some sensitivity, the relationship between horn length and the bandwidth covered by

the enclosures means that each source is effectively an omni-directional point source.

Therefore any LF pattern control experienced when using an Aspect system derives from

adjacent enclosures within an array or from the relationship of a left to right stack

Bass Enclosure arraying

Aspect bass enclosures are most efficient when ground stacked in a block. Not only do they

benefit from improved coupling when there are no air gaps between them, but they also

couple to the ground. However, some of this energy may be absorbed by nearby obstructions

such as barriers or a tightly-packed standing audience. Sound pressure levels may also be

excessive for members of the audience if they are able to get too close to the enclosures.

When stacking on the stage or on a platform, particularly outdoors, it is preferable to close

the gap between the platform and the floor with sheets of plywood. This results in increased

sound projection into the audience and less leakage backstage.

Aiming - directivity of the stack

The directivity of the bass stack will depend on its dimensions and curvature. A tall thin stack

will disperse a lot in the horizontal plane and become narrow in the vertical plane whereas a

wide stack will narrow in the horizontal plane. There is usually an optimum compromise

between the two so that a smooth transition can be obtained between the effect of the

coupling of the two stacks down the centre line of the room and the effect of the individual

stacks beaming on their axis. Also adding some curvature to the stack will help to increase

the directivity of the stack especially in stopping beaming at higher frequencies.

Contents

Main Page Page Page Page EC DECLARATION OF CONFORMITY Page Page TA-890 TA-890 user manual Page 9 ASPECT TA-890 TURNKEY SYSTEM CONCEPT The Loudspeaker Management System (LMS) Concept LMS-D24, LMS-D26 and LMS-D6 Loudspeaker Management Systems Amplifier Racks Power Amplifiers Digital Controllers Aspect Loudspeaker Components TA-890L Low Frequency Enclosure TSW-218 Subwoofer TA-890H Mid-high Enclosure Page Transportation Page FLYING AND STACKING Overview GIGMATE ACOUSTIC SIMULATION Setting up a Venue - Overview Page Page Designing a system Page Page Page Page Safety Notes on Rigging Page Flying Hardware Wide and Narrow Flybar Settings Page TO P VIEW BOT TOM VI EW BOTTOM VIEW TOP VIEW 4m 0.59m Three-wide hang using MB-890, EB-890, FB-890/2A and FB-890/1A Page Page Page Page TA-890 user manual Page 37 Attaching the Tilt Straps Fig 1 attach buckle Figure 2 take up slack Page Page Page Page Fanned bass Bessel Array General observations of long lines of bass Page Summing up Ground stacking Page LMS-D6 Front Panel Functions LMS-D6 Rear Panel Functions Mains Power Voltage Setting Safety Earthing AC Power Fusing Powering Up Audio Connections Input and Output Connector Wiring Time correction for loudspeaker driver placement Page Front Panel Functions Page Rear Panel Functions Page Navigation and Viewing Parameters LMS-D26 In A Freq Width Gain EQ1 100Hz 1.4Q 0.0dB cba abc Navigation Out1 Freq Width Gain EQ1 100Hz 1.4Q 0.0dB CHANNEL EDIT Preset Recall LMS-D26 Preset Name Recall 32 My System a abc SELECT PRESET TO RECALL Preset Store Preset Name Store 32 My System c b DSP PROCESSING LAYOUT Input DSP block diagram Output DSP block diagram Stereo / Mono Formats DSP PROCESSING Input Channels LMS-D26 In A Gain 0.0dB abc a LMS-D26 In A Freq Shape HPF 20.0Hz LR24 abc a b Parametric Equalisation In A Freq Slope Gain EQ1 100Hz 12dB 0.0dB abc a b c Parametric filters Out1 Gain Pol 0.0dB Rev abc a b Delay Out1 Freq Shape LPF 2.50k LR24 abc a b Parametric Equalisation Out1 Freq Slope Gain EQ>- 100Hz 12dB 0.0dB abc a b c LMS-D26 Out1 Thresh LIM 4.0dB abc a Routing Util Screen ParaEQ 100% BW=Q ab c Rear Panel Functions AMP-890 ASPECT SYSTEM AMPLIFICATION RACK Racking, Cables and Connections Options Input Connections Figure 1. Amplifier Rack Signal Wiring RSTU } } CHANNEL B DCBA EFGH MN P Q J V Figure 2. Mid-High Outputs NL8 P IN NO . CHANNEL 2 BASS B CHANNEL 1 BASS B CHANNEL 2 BASS A SOCAPEX PIN NUMBERS 17,18,19 NOT USED FANOUTS CAN BE SUPPLIED TO EITHER CONNECT 6 OR 8 CABINETS TO TWO AMPLIFIER S Break-out cables NL8 mid-high SO C APEX PIN N SO Mains Connections T-25 AND T-45 HIGH EFFICIENCY AUDIO POWER AMPLIFIERS General Features & Facilities Front Panel Functions T-25 Front Panel Functions T-45 Mechanical Installation Mains Power Powering Up Safety Earthing Voltage Setting Voltage Range Audio Connections & Controls Polarity Input Impedance Gain and Sensitivity Settings Attenuation & Gain Setting Output Connections Damping Factor Long Speaker Lines The Cooling System MAINTENANCE Page To rotate the horn moulding from B mode to A mode Removal of the high frequency driver TA-890 TA-890 user manual Page 89 Removal of the high-mid frequency driver TA-890 TA-890 user manual Page 90 Removal of the low-mid frequency drive units General Maintenance Flying hardware Paintwork Page TECHNICAL SPECIFICATIONS WARRANTY