KF750
The KF750F 3-way tri-amplified full range system contains several EAW technologies that make it a powerful concert touring sound reinforcement tool. Its Acoustic Singularity design aligns the three sub-systems along a single axis so that the KF750 acts as a true point source. This greatly reduces temporal smearing of transient events and improves overall clarity and impact.
Since the large mid frequency horn contains both the high and low frequency sub-systems, the overall package is just 31 in high. Still, the KF750F provides consistent wideband pattern control in both the vertical and horizontal planes.
The LF subsystem includes two vented 12-in woofers mounted in the MF horn`s upper and lower walls. The large MF horn loads a specially designed 10-in midrange cone whose geometry exactly matches the rear of its phase plug assembly. By developing the driver and phase plug as a single unit, pathlength discontinuities within the MF passband have been eliminated without compromising the directional qualities of the source as all previous phase plug designs have. The 2 in exit/4 in voice coil HF Compression Driver in mounted on a 35deg x 35deg constant directivity horn mounted coaxially within the MF horn flare.
The KF750F`s 15deg-per-side trapezoidal enclosure features eight 4-position fly tracks (four each front and rear) that accept industry-standard fly clips.
Applications
The KF750F is designed to create arrays with optimized coverage in both the horizontal and vertical planes to cover audience areas ranging from 200 to 80,000 people. At just 31 in tall and 190 lb per module, KF750F arrays are smaller, lighter, more efficient and therefore more powerful than those built with other systems. These smaller, lighter arrays are easier to fly, require less truck space and permit more open sight lines to cover any given Venue.
The KF750F works with a companion downfill module, the KF755F, to provide full range nearfield coverage below the array. When KF755`s are either not available or not desired, the KF750F`s smooth power response produces remarkably even SPL levels throughout the coverage area, allowing it to be use for nearfield coverage when necessary.
SB750
A dedicated subwoofer system with 2x18-in transducers in a vented trapezoidal enclosure. An SB750F enclosure shares the same footprint as a KF700 Series module and is almost exactly one-and-a-half times its height, meaning that a two-high column of flown SB750?s is exactly the same height as a three-high column of flown KF700 Series modules.At less than 200 lbs. per enclosure, SB750F?s offers users the flexibility of adding them to flown arrays without adding inordinate weight.
The sub bass loudspeaker systems shall incorporate 2x 18-in LF transducers mounted in a vented enclosure tuned for optimum low frequency response.System frequency response shall vary no more than ±3 dB from 30 Hz to 150 Hz measured on axis with appropriate signal processing. The loudspeaker shall produce a Sound Pressure Level (SPL) of 101 dB SPL on axis at 1 meter with a and shall be capable of producing a peak output of 139 SPL on axis at 1 meter. The loudspeaker shall handle 1600 (2x800) Watts of amplifier power (AES Standard) and shall have a nominal impedance of 4 (2x 8) Ohms.
The loudspeaker enclosure shall be trapezoidal in shape. It shall be constructed of 15mm thickness void-free cross-grain-laminated Baltic birch plywood and shall employ extensive internal bracing. It shall be finished in black polyurethane.
Input connectors shall be Neutrik NL4 Speakon. A total of 8x4-position flytracks (1 each front and rear corners) shall be provided. The front of the loudspeaker shall be covered with a powder coated perforated steel grill.
The sub bass loudspeaker shall be the EAW model SB750F
Features
- VA4 subwoofer system
- 2x 18" woofers, vented
- F version optimized to fly with KF700 Series arrays
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Used EAW-Eastern Acoustic Works
Eastern Acoustic Works (EAW) is an American manufacturer of mainly professional audio reinforcement tools, such as loudspeaker systems and processors. From 1978-1988 it was located at 59 Fountain Street in Framingham, Massachusetts, and subsequently One Main Street in Whitinsville, Massachusetts.Eastern Acoustic Works was co-founded in 1978 by partners Kenneth Berger and Kenton Forsythe, who had previously worked together at Forsythe Audio.
EAW's first single enclosure system was the CS-3 designed for Carlo Sound in Nashville, Tennessee. It combined a B-215 dual 15-in low-frequency horn, a MR102 12-in mid-frequency horn and a Community BRH90 high frequency horn into one gigantic box, and was the first commercially available horn-loaded single enclosure box system.
In 1985 EAW became famous by developing the KF850 loudspeaker system. For many years this system was the standard among loudspeakers used for professional touring shows. With this system EAW gained much of its credibility in the professional audio industry. Carlo Sound and Sun Sound were among the first regional sound rental companies to receive the KF850's.
EAW also became well known for creating custom loudspeaker designs for specific projects and applications. Technologies developed for these designs have led to the development of many of EAW's standard products, which are mainly used in professional and commercial sound reinforcement applications, such as concert venues, music and dance clubs, theaters, stadiums, theme parks, and houses of worship.
In 2000 EAW was purchased by Mackie Designs, Inc., now called LOUD Audio, LLC.
In 2018, EAW was purchased by RCF, to be run as a separate entity.
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Active: Powered. An active crossover is electrically powered and divides the line-level signal prior to amplification. An active speaker includes an active crossover and built-in amplifier.
Actuality: Audio from an announcer speaking.
Amplifier: A component that increases the gain or level of an audio signal.
Balanced Input: A connection with three conductors: two identical signal conductors that are 180 degrees out of phase with each other, and one ground. This type of connection is very resistant to line noise.
Bandpass: A two-part filter that cuts both higher and lower frequencies around a center band. A bandpass enclosure cuts high frequencies by acoustic cancellation and low frequencies by natural physical limitations on bass response.
Bandwidth: In audio, the range of frequencies a device operates within. In video, the range of frequencies passed from the input to the output. Bandwidth can also refer to the transmission capacity of an electronic communications device or system the speed of data transfer,is very important when planning a meeting for the attendees to stay connected.
Bass: Low frequencies those below approximately 200 Hz.
Bi-Wiring: A method of connecting an amplifier or receiver to a speaker in which separate wires are run between the amp and the woofer and the amp and the tweeter.
Boost: To increase, make louder or brighter opposite of attenuate.
Bridging: Combining two channels of an amplifier to make one channel that more powerful. One channel amplifies the positive portion of an audio signal and the other channel amplifies the negative portion, which are then combined at the output.
CD: Compact Disc. Ubiquitous digital audio format. Uses 16-bit/44.1-kHz sampling rate PCM digital signal to encode roughly 74 or 80 minutes of two- channel, full-range audio onto a 5-inch disc.
CD-R: Recordable Compact Disc.
CD-RW: Rewritable Compact Disc.
Channel: In components and systems, a channel is a separate signal path. A four-channel amplifier has at least four separate inputs and four separate outputs.
Coloration: Any change in the character of sound (such as an overemphasis on certain tones) that reduces naturalness.
Crossover: A component that divides an audio signal into two or more ranges by frequency, sending, for example, low frequencies to one output and high frequencies to another. An active crossover is powered and divides the line-level audio signal prior to amplification. A passive crossover uses no external power supply and may be used either at line level or, more commonly, at speaker level to divide the signal after amplification and send the low frequencies to the woofer and the high frequencies to the tweeter.
Crossover Frequency: The frequency at which an audio signal is divided. 80 Hz is a typical subwoofer crossover point and is the recommended crossover point in theatrical and home THX systems. Frequencies below 80 Hz are sent to the subwoofer signals above 80 Hz are sent to the main speakers.
Cut: To reduce, lower opposite of boost.
Decibel (dB): A logarithmic measurement unit that describes a sound`s relative loudness, though it can also be used to describe the relative difference between two power levels. A decibel is one tenth of a Bel. In sound, decibels generally measure a scale from 0 (the threshold of hearing) to 120-140 dB (the threshold of pain). A 3dB difference equates to a doubling of power. A 10dB difference is required to double the subjective volume. A 1dB difference over a broad frequency range is noticeable to most people, while a 0.2dB difference can affect the subjective impression of a sound.
Delay: The time difference between a sonic event and its perception at the listening position (sound traveling through space is delayed according to the distance it travels). People perceive spaciousness by the delay between the arrival of direct and reflected sound (larger spaces cause longer delays.
Diaphragm: The part of a dynamic loudspeaker attached to the voice coil that produces sound. It usually has the shape of a cone or dome.
Diffusion: In audio, the scattering of sound waves, reducing the sense of localization. In video, the scattering of light waves, reducing hot spotting, as in a diffusion screen.
Digital Audio Server: Essentially a hard drive, a digital audio server stores compressed audio files (like MP3 or WMA). Most include the processing to make the files, and all have the ability to play them back.
Direct-Stream Digital: A format for encoding high-resolution audio signals. It uses a 1-bit encoder with a sampling rate of 2,822,400 samples per second (verses 44,100 for CD). Used to encode six high-resolution channels on SACD.
Dispersion: The spread of sound over a wide area.
Distortion: Any undesired change in an audio signal between input and the output.
DNR: Dynamic Noise Reduction. A signal-processing circuit that attempts to reduce the level of high-frequency noise. Unlike Dolby NR, DNR doesn't require preprocessing during recording.
Dolby B: A noise-reduction system that increases the level of high frequencies during recording and decreases them during playback.
Dolby C: An improvement on Dolby B that provides about twice as much noise reduction.
Dolby Digital: An encoding system that digitally compresses up to 5.1 discrete channels of audio (left front, center, right front, left surround, right surround, and LFE) into a single bitstream, which can be recorded onto a DVD, HDTV broadcast, or other form of digital media. When RF-modulated, it was included on some laser discs, which requires an RF-demodulator before the signal can be decoded. Five channels are full-range the .1 channel is a band-limited LFE track. A Dolby Digital processor (found in most new receivers, preamps, and some DVD players) can decode this signal back into the 5.1 separate channels. Most films since 1992`s Batman Returns have been recorded in a 5.1 digital format, though a number of films before that had 6-channel analog tracks that have been remastered into 5.1.
Dolby EX: An enhancement to Dolby Digital that adds a surround back channel to 5.1 soundtracks. The sixth channel is matrixed from the left and right surround channels. Often referred to as 6.1. Sometimes referred to as 7.1 if the system uses two surround back speakers, even though both speakers reproduce the same signal. Software is backwards-compatible with 5.1 systems, but requires an EX or 6.1 processor to obtain additional benefit.
Dolby Pro Logic: An enhancement of the Dolby Surround decoding process. Pro Logic decoders derive left, center, right, and a mono surround channel from two-channel Dolby Surround encoded material via matrix techniques.
Dolby Pro Logic II: An enhanced version of Pro Logic. Adds improved decoding for two-channel, non-encoded soundtracks and music.
Driver: A speaker without an enclosure also refers to the active element of a speaker system that creates compressions and rarefactions in the air.
DSP: Digital Signal Processing. Manipulating an audio signal digitally to create various possible effects at the output. Often refers to artificially generated surround effects derived from and applied to two-channel sources.
DTS: Digital Theater Systems. A digital sound recording format, originally developed for theatrical film soundtracks, starting with Jurassic Park. Records 5.1 discrete channels of audio onto a handful of laser discs, CDs, and DVDs. Requires a player with DTS output connected to a DTS processor.
DTS ES: An enhanced version of the 5.1 DTS system. Like Dolby's Surround EX, a sixth channel is added. In some cases (DTS ES Discrete), the sixth channel is discrete. Software is backwards-compatible with 5.1 systems, but requires an ES or 6.1 processor to obtain additional benefit. Neo: 6 is a subset of DTS ES that creates 6.1 from material with fewer original channels.
Dynamic Range: The difference between the lowest and the highest levels in audio, it&'s often expressed in decibels. In video, it's listed as the contrast ratio.
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