A method for designing a compact back loaded horn loudspeaker system by martin j. Compression drivers horns neodymium compression drivers cone. Ckttf1020 system the ckttf1020 system is a compact 2way speaker design suitable for stand or floor mounting. Acoustical analysis of a hornloaded compression drivers using. Loudspeaker compressiondriver phaseplug design eprints. Reflex hornscompression drivers longthrow and widedispersion projector horns complimented by the pd series of compression drivers for the most demanding paging applications. Jbl chief engineer greg timbers, continue this performanceproven tradition.
Acoustical analysis of horn loaded compression drivers using numerical techniques daniel r. A new methodology for the acoustic design of compression driver phaseplugs with concentric annular channels. While computations of the hornloaded compression driver are in steady state, transient analysis of the finitelength pipe is studied as a precursor to transient analysis within the hornloaded compression driver. Simulation of horn driver response by direct combination of cd frequency response and horn fea d. A compression driver, on its own, is not loud enough to balance a woofer. There has to be a certain amount of acoustical impedance, or resistance, provided by the air in the throat of the horn for the diaphragm. Horns for compression drivers should not be shortened truncated and must be 1 wavelength long at lowest frequency. The acoustical behaviour of the compressiondriver phase plug and compression cavity is discussed and targets are determined for the ideal behaviour. Sometimes it seems there is a disconnect in peoples minds between a cone driver loaded by a horn and a compression driver loaded by a horn. Description the rx 22, referred to as the radial x compression driver, is one of the latest advances in compression driver design and manufacturing for peavey electronics. The ph180 offers a square mouth design that allows for horn rotation within an enclosure. The reason that compression drivers are called compression drivers is because, when the diaphragm moves, it compresses the air in front of it.
Response on jbl 2380a flatfront biradial horn frequency response of the 2446j coupled to a jbl 2380a. You dont want a large hole like that because you have to have them tapped into the horn close to the compression driver, and if you had a large hole like that it would wreak havioc on the fr of the compression driver. Pdf simulation of horn driver response by direct combination of. Over 8 khz the dome diaphragm breaks up causing resonance and harsh, metallic sound.
The m75n compression driver employs a powerful neodymium magnet structure, a titanium diaphragm and 75 mm 3. The compression driver shall be the jbl model 2446hj. The jbl studio 5 series features topoftheline professional speaker technology in a modern design while being very affordable. Altec lansing drivers, loudspeakers, and horns great plains. New book on highquality horn loudspeaker systems now. How and why horn loudspeakers were replaced by conventional direct radiator loudspeakers in most consumer applications. The smith guidelines for the design of annularchannel compression drivers are outlined. The horn is necessary to focus the output of the compression driver and control the radiation pattern.
This allows the designer to pay more attention to the directional characteristics than the. They have evolved into a science, and over the years, have been used with good results by many sq competitors. A common form right consists of a compression driver which produces sound waves with a small metal diaphragm vibrated by an electromagnet, attached to a horn, a flaring duct to conduct the sound waves to the open air. Low frequency horns using cone speakers can be 12 but not less than 14 wavelength at the lowest frequency, with reduced efficiency. In addition compression driver behavior depends by the horn profile. A smithtype approach to the design of radialchannel compression. To briefly explain the history of horn loudspeakers. The dome diaphragm unlike a cone cannot flex with excessive movement and fractures easily. Its low mass polyimide diaphragm and optimized ceramic magnet assembly.
Fostex was founded by foster electric who have been developing high quality speaker components since 1949. Maximum efficiency of compression drivers audio round table. This allows for a single operation for diaphragm removal and acts as an effective outofdriver diaphragm protection. The flagship jbl 4365 studio monitor was first produced in 2010, setting new levels of performance by employing the 1501fe8 15 woofer, a 476mg highfrequency compression driver and horn, and an 045ti 1 ultrahighfrequency compression driver and horn. The ckttf1525e system is a high performance 2way speaker design suitable for stand mounting.
Unfortunately, the design process for horns or compression drivers often includes guesswork and is sometimes not very scientific. Jul 20, 2014 design, advanced computer modeling, measurements and discussion of a high efficiency triamplified speaker consisting of a low frequency vented enclosure bass reflex, a hybrid conicalexponential midrange horn and a compression tweeter. Altec lansing drivers, loudspeakers, and horns great. With compression drivers frequency response database is possible to fast predict spl of each driver. The radial x has been designed to improve driver performance. A reengineered mounting system which tightens internal tolerances along with a new shorting ring design have increased the power handling capacity of the driver. New horn designs and better transducer layout, both results of advanced modeling. Tengelsen department of physics and astronomy master of science two numerical techniques, the boundaryelement method bem and the finitedifference method fdm, are used for simulating the radiation from horn loaded compression drivers and.
This is due to the fact that todays compression drivers are very efficient and have a much higher powerhandling capability than in past decades. One is that cone driven horns are usually designed starting with the thiel small parameters of the driver while the ts parameters are usually not available for a. They have no belts which need adjusting and eventual replacement. The major advancement in xd125 compression driver consists in a new innovative diaphragm assembly made in proprietary treated polyethylene material. Presented at the 123rd convention of the audio engineering society. Table of contents high quality horn loudspeaker systems. Pdf a new method of horn driver simulation has been developed. Architects and engineers specifications the loudspeakers shall be of the compression.
The system offers wide bandwidth, high sensitivity and high output capability and can be used. Longer wavelengths than the horn length cause the diaphragm to move excessively. Hlcds, or hornloaded compression drivers, are a type of highend car audio speaker design stemming from proaudio experimentation in the late 80s. Alteclansing 807a and 8088a hf compression drivers. The massive 1070page hardcover book caused quite an impression among aes members and the visitors who attended the two signing events on wednesday and friday. It is a versatile and highly portable system that offers good performance when used either. For compression drivers, an existing design was compared to several different prototype designs. The patented design of the bms 4592 is a result of extensive dedicated research and development providing dramatic improvement in dynamic response, clarity and transparency. Due to the low power output of the triode, high efficiency loudspeakers were required to produce sound pressure levels sufficient to be heard in a room, which happened in 1927 when two bell laboratory engineers, wente and thuras, invented the compression horn driver, commonly known as a driver.
If you want to play around with hr, there is at least one set of comp data you can find on the internet. Unbranded pro audio speaker horncompression drivers for. The 2370a features an integral throat that will accept any jbl compression driver having a 25 mm 1 in throat diameter. Ds18 prodkh2 compression driver with aluminum horn 3, 1200w max, 800w rms, 8 ohms, 3 voice coil, titanium diaphragm engineered and designed in the us, the ds18 compression drivers with aluminum horns are the top of the line high frequency drivertweeterhorns in the market. To predict the driver horn combination behavior, different. The biradial compound flare configuration of the horn provides constant coverage over defined, solid angles.
Great deals on unbranded pro audio speaker horncompression drivers. The xd125 has been designed for 2 way or 3 way systems. The ph4528 is constructed from high impact abs with additional glass fillers for superior structural support and rigidity. This dramatically improves the directionality of the speaker system while the design of the compression horn improves spl. Its a great time to upgrade your home music studio gear with the largest selection at.
Hd1050 1 compression driver fe the hd1050 one inch exit high frequency compression driver has been designed for use in high quality audio systems. A method for designing a compact back loaded horn loudspeaker. Horn loudspeaker design theory and practice by randy. Details of a highfrequency compression driver are shown in figure 1.
One way to achieve optimum midrange coverage is to use a screwon or bolton compression driver and match it with the appropriate horn flare. The horn mouth width is ideal for use with 8 inch and larger loudspeakers in professional level two way system designs. Alteclansing mr90216hf hf compression driver horn assembly. The cdx11425s minimal size makes it ideal for the spacing constraints of professional line array systems as well as very small 2way and 3way loudspeakers. It will deliver an unmatched combination of extended linear frequency response and very high efficiency. It is attached to an acoustic horn, a widening duct which serves to radiate the sound efficiently into the air. Simulation of horn driver response by direct combination. Recommended horns the following electrovoice horns are recommended for use with the dh1a. The easier and more common way is to just design the horn without the data for the driver. A compression driver depends upon the acoustical coupling of the horn for it to operate properly. The diaphragm movement is designed to be very very. Other drivers will be considered for equivalency provided that submitted data from a recognized independent test laboratory verify that the above performance specifications are met.
High efficiency audio systems require high frequency reproduction that is loud, clear, and accurate, with a minimum of coloration or distortion. The use of high grade neodymium magnets provide improved performance while significantly reducing transducer weight. There has to be a certain amount of acoustical impedance, or resistance, provided by the air. The jbl studio 590 floorstanding loudspeaker combines a 25mm 1 hf compression driver and biradial horn with dual 200mm 8. This allows the designer to pay more attention to the directional characteristics than the loading of the driver in newer horn designs.
A horn loudspeaker is a loudspeaker or loudspeaker element which uses an acoustic horn to increase the overall efficiency of the driving elements. All of the questions actually relate to how the driver is loaded by the horn. Alteclansing mr90216hf hf compression driverhorn assembly. A compression driver is a small specialized diaphragm loudspeaker which generates the sound in a horn loudspeaker. The patented design of the bms 4592 nd is a result of extensive dedicated research and development providing dramatic improvement in dynamic response, clarity and transparency. Celestion cdx11425 neo 1 compression horn driver 25w. Above 1khz, special compression drivers are used with horns. Simulation of horn driver response by direct combination of. Tools for the professional development of horn loudspeakers. This system comprises the tf1020 10250mm bassmidrange driver and cdx11445 compression driver fitted with the h17050 nobell horn.
This system comprises the tf1525e 15380mm bassmidrange driver and cdx11747 compression driver fitted with the h19040 horn. In comparison, a horn loudspeaker with a midrange compression driver efficiency of 25 to 30 percent will require as little as 10 or 12 watts of power input to produce the same 2 or 3 watts of acoustical power output a vast improvement in efficiency. Hf compression driver crossover questions technical. The horn is compatible with many competitive compression driver designs because of its industry standard throat diameter. Its low mass polyimide diaphragm and optimized ceramic magnet assembly allow high sensitivity and low distortion up to 18 khz. Hf drivers are available with aluminum, titanium, phenolic. Acoustical analysis of a hornloaded compression drivers. Celestion cdx11425 neo 1 compression horn driver 25w the celestion cdx11425 is a leading example of the emerging class of ultracompact neodymium high frequency drivers. Ds18 prodkh1 450 watts 2inch compression driver with. Compressor design, application, and general service part 1 by. Fostex continue to develop quality products for professionals and hifi enthusiasts. A method for designing a compact back loaded horn loudspeaker system martin j. Great deals on pro audio speaker horncompression drivers.
With minimal amplification, these hifonics uhs technology drivers can produce 92db from a 6. Compression driver and bell combinations that make horns. There are other unique variations of horn and driver arrangements available, not described in this text. A typical 2 dome compression driver has a limited high frequency response. Nagengast other advantages of the hermetic type compressor are that it is smallermore compact, more free of vibration, and has its motor continuously and positively lubricated. This design avoids the performance disadvantages of horns that feature sharp flare transitions and flat sidewalls. It is demonstrated that, for realistic geometries, the smith guidelines do not lead to optimum performance.
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