LINE ARRAY SERIES

 THE SERIES

Line Array Series consists of LA–208 compact full range system, LA–315 full size full range system, LA–215B dual 15–inch subwoofer, LA–218B dual 18–inch subwoofer and LA–121B single 21–inch subwoofer, any full range systems can be configured with any subwoofers to form a four-way system.

A line array is theoretically a continuum of small line segments distributed along a line. As compared to conventional loudspeaker array, the advantages of a line array are:

1.

In near and mid field, the attenuation of sound pressure level due to increase of distance is smaller. (See Figure 4 and Figure 5) as the wavefront produced is planar rather than spherical. Within a certain distance, the sound pressure is more evenly distributed. It is not too loud close to the source and is not too weak at mid field.

Figure 4

Figure 5

2.

The rated horizontal dispersion angle of the element (loudspeaker) is very wide and the vertical dispersion angle is very narrow. This superb control of directivity make it easier to concentrate the sound energy within the audience area and reduce the interference of reverbration field.

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WAVE SERIES

THE SERIES

Wave series consists of W-3F, W-6F and W-8F full range speakers plus W-118, W-218B subwoofer altogether five models. All these models can be arranged in any number to make up an array of three or four way system suitable for venues and functions of all scales.

It is obvious that small number of speakers are insufficient to cope with large scale activities. It needs sufficient number of speakers to make up an array for large venue where high SPL is required, Speakers that intend to make up the array, the following minimum criteria must be met

• The dispersion angle must not be too wide
• There must be minimum interference between adjacent speakers
• Safe and speedy rigging and derigging

To increase the maximum SPL of individual speaker so that the array has sufficient sound pressure suitable for the requirement of arraying. To achieve this goal, all speaker units in Wave Series no matter it is LF, MF or HF are all horn loaded for its high efficiency though it will increase the production cost.

The mid and high frequency band of all Wave Series models are horn loaded and the low frequency band is front horn loaded plus bass reflex design.

As compared to direct radiator type speaker, the advantage of horn loading is:

The sound wave radiated from the diaphragm (cone) to free space, the wave front changes (expanding) rapidly. The radiating resistance is low, and so does the efficiency.

As the cross section of a horn changes (expanding) gradually, so does the wave front of the sound wave radiated from the diaphragm (cone) that couple to the horn. The radiating resistance is high, the amplitude of the vibrating diaphragm is reduced, so does the efficiency of transformation. (See Figure 29)

Figure 29

For the rear radiation of the LF band, the enclosure is a vented design, The enclosure is a phase inverted (or vented) design. The advantage of this design is that sound wave radiated from the rear of the speaker is in phase with the sound wave radiated from the speaker front by proper phase adjustment after passing through the vent. The vent itself functions as an additional radiator is this case, and its radiation can add constructively to that of the speaker over certain frequencies. It requires less speaker excursion and therefore reduced amplitude distortion for a given acoustic output in the lowest portion of its usable bandwidth. This effect is most noticeable for frequencies in the neighborhood of the system lower cutoff frequency.

For the same lower cutoff frequency, the enclosure can be made smaller and due to this reason, the air within the enclosure acting as an air cushion at very strong transient signals. (See Figure 30)

Figure 30

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ARRAY SERIES

 THE SERIES

Array Series is specifically designed for sound reinforcement system in fixed installations. As the venues of fixed installation varied a great deal, there are various size, large and small, various seating arrangement, rectangular and sectoral, various floors, flat and stepped, etc. etc. that needed a series of speakers versatile enough to cater for all these situation, while rigging and installation with ease, Array Series consists of AR-112/45, AR-112/64, AR-115/45 and 115/64 2-way, 2-element full range speaker, AR-153 3-way, 3-element full range speaker, AR-215B and AR-218B subwoofers. Any of these subwoofers may be used in conjunction with any of these full range speaker to make up a three or four way systems. The full range speakers may be used individually for some special applications. All AR Series speakers are fitted with large reinforced aluminum rigging tracks, all weights from adjacent speakers are applied to these tracks when arraying. The enclosure does not carry any external weight expect itself. It is very safe.

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MONITOR SERIES

The Series

M Series comprised of M-112 and M-115 full range speakers. Like regular speakers, it has wide and smooth frequency response and sufficient sound power. As monitor speakers are normally laid flat on the stage for the performers to monitor their own voice, it has to be good in voice reproduction.

Radiation must be kept away from the stage floor as the reflection of it will interfere with the direct radiation to the performers and cause distortion. (See Figure 166)

Monitor speakers are placed on the stage floor for the performer to listen not to obstruct the view of the audiences, keep the profile as low as possible.

The directivity of the monitor speaker must be well controlled to reduce the possibility of positive feedback.

If the speakers to be used other than stage monitor, the directivity must be able to change when placed up right.

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PHASE SERIES

 THE SERIES

Phase Series consists of PH-108, PH-110, PH-112 and PH-115 full range speakers plus PH-118B subwoofer, altogether 5 models. The goals of applications of this series are:

• A sound reinforcement system needs only two full range speakers plus two subwoofers for smaller activities or even only two full range speakers would be suffice for some occasionsThe entire sound reinforcement system requires minimum number of power amplifiersOther than used as the main speakers of a small sound reinforcement system it may also be used as the auxiliary or supplement speaker for large systems such as stage front fill, delay fill and near field fill, etc. Since only small amount of speakers to make up a system, each individual speaker must have sufficient bandwidth, smooth phase and frequency response. All speaker units were designed and developed toward this goal
• Good performance to price ratio

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QUALITY SERIES

 THE SERIES

Quality Series comprised of Q-112 and Q-115 full range speakers plus Q-181B and Q-218B subwoofers.

Quality Series speakers are most cost effective among all iBO series of speakers. Targeted on simple sound reinforcement systems where two full range speakers are sufficient or perhaps adding two more subwoofers to form a larger system.

The mellow and undamped tonal quality of the Q Series is most favored in KTV’s VIP rooms, iBO intentionally reduce the damping on all LF units of Q Series full range speakers in order to produce the kind of undamped bass.

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