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Reentrant horn loudspeaker

The Bogen SPT15A is compact, high intelligibility, reentrant type loudspeaker, designed for one-way or two-way sound and communication systems. Their sturdy, weatherproof, all-metal construction is ideal for indoor and outdoor use in industrial plants, warehouses, schools, construction sites, transportation terminals, and recreational areas. The Model SPT15A has a built-in, rotary impedance selector switch for matching the speaker power requirements to a 25V or 70V constant-voltage line. Your source for Panasonic phone systems for over 30 years!


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Bogen IH8A Paging Outdoor Speaker Horn 15 Watts (8 Ohm)


LEVY 2,, Levy, Brooklyn, N. A feature of my invention is the provision of a cylindrical plug having therein a tone arm and to which a driving unit, reflector, bell and mounting bracket may all be secured. Another feature of my invention is the prosision of such a cylindrical plug permitting a bell section, and also a mounting bracket if desired, to be assembled in a loud speaker by compression between a shoulder of the driving unit and the bottom of a sleeve which is unitary with such plug.

Another feature of my invention is the provision of such a plug to which a reflector may be attached by simple means. Another feature of my invention is the provision of amounting unit to which a tone arm, reflector, driving unit and bell may all be secured.

Another feature of my invention is the provision of a mounting basket which will serve to secure a bell section to a mounting unit and which provides for the simple and economical attachment of a mounting bracket. In the drawings- Figure l is a view partly in section of a reflex air column loud speaker of conventional type which is used for the purpose of explanation;. Figure 2 is a view partly in section of a reflex air column loud speaker of small size in accordance with the present invention;.

Figure 4 is a view partly in section of a. Figure 6 is a side View of a basket which may be substituted for the basket 31 of Figure 4; and. In a reflex air column loud speaker the parts, as is well known, must be made and assembled with high precision, ii a good acoustic result is to be obtained.

In Figure 1 the conventional unit there shown comprises a driving unit I, a tone arm 2, a reflector 3, a bell section 4, and a mounting flange 5 having mounted therein studs 6 to. The mounting flange 5 has therein a tapped opening within which is screwed the threaded projection 6 of the driving unit I.

It is necessary to provide on the mounting flange 5 a shoulder at the interior end of the tapped opening against which the end of the driving unit presses tightly to make an air tight fit between the tone arm 2 and the driving unit I at the throat I of the tone arm. The tone arm is commonly ,force fitted into the mounting flange and its end spun over into the shoulder 8. In Figure 2 the loud speaker of my invention has a cylindrical plug III which is integral with a sleeve I I, defining a tone arm between the plug and sleeve.

The plug and sleeve are preferably made as a single unitary piece, for example by an attachment II! Also part of the casting are three cars I3, I4 and I5 see also Fig.

The sleeve II is tapped as shown to permit screwing into position the threaded throat II of a driving unit I 8.

A mounting bracket I9 may be used which has an opening 20 and a shoulder H. In assembling the unit a washer 22 may be placed on the sleeve II, the bell section 23 placed in position as shown, the mounting bracket I 9- placed against the bell section 23 in the position as indicated in the drawing, and the driving unit It screwed into position within the sleeve 'II.

A shoulder 24 on the driving unit will then engage the shoulder 2 on the mounting bracket pressing it firmly into position against the bell 23 and holding the mounting bracket, tone arm, and bell all securely together. The plug III has in its upper end a tapped open ing within which may be screwed a bolt 25 to hold a reflector 26 in position.

This completes the assembly. It is to be noted that the assembly of the complete unit, including a mounting bracket therefor, involves only placing the parts in proper position and screwing the driving unit I8 and bolt 25 into place. It is to be further noted that the plug III permits the sleeve II to be considerably larger at its lower end than is the lower end or shoulder I of the tone arm 2 in Figure 1 without, however, increasing the area of the air column at this point.

It is therefore possible with my invention to eliminate a press fit between the throat of the driving unit and a mounting mem: ber, as in Figure l, and, instead, to provide pres-' sure between a shoulder 24 on the driving unit and the sleeve II to assure an airtight junction with the throat of the air column. It will also be noted that my construction proquency dictates. Such construction permits the bending of this type of air column in a shorter plane than would be permissible without the plug I 0, giving the advantage of minimizing phase cancellation at the higher frequencies.

As the plug I is a heavy rigid structure the reflector 28 is positively retained in fixed position with great accuracy, thus improving the acoustical performance. Because of the loss of quality which is occasioned by any minute variation in the position of the parts of a loud speaker assembly it has heretofore been necessary to assemble a reflex air column type of speaker completely at the factory before shipping it to assure accurate positioning of the parts.

This is not only an expensive procedure but also requires very elaborate and expensive packaging to avoid shocks in transit. With the loud speakers of my invention as disclosed herein, the assembly is so simple and the positioning of the parts is so accurate and sure that the parts may be assembled by anyone without the necessity for any final adjustment.

It is therefore possible to ship my loud speakers knocked down and assemble them with unskilled personnel after delivery, thus effecting large savings. In Figures 4 and I have shown a construction which ma be used for a larger size of loud speaker thanthat of Figures 2 and 3 in which many of the advantages are retained. Speakers of the size referred to are those which are too large for a plug such as plug it of Figure 2 to be practicable because of its size and weight.

In Figure 4 there is a driving unit 21, a mounting member 28, a tone arm 29, a reflector 30, and a bell The mounting member 28 has a tapped opening. The mounting member 28 has three projections 33 for holding and positioning the reflector Within the upper end of the tone arm 29 is a spider 34 see also Fig. The spider 34 has a bolt 35 aflixed thereto as by welding. A cap 35, which may be a casting with a tapped opening therein, may be screwed into position on the bolt 35 fixedly positioning the tone arm, reflector and cap with respect to one another, rigidly holding the reflector in position.

The cap 33 will have its interior surface accurately made and finished to provide the exact dimensions necessary for reflecting the sound wave from the tone arm into the reflector. Ihis is one of the most critical dimensions in a reflex air column loud speaker and the provision of the cap 36 which accurately and rigidly positions the members and holds them in fixed position makes it possible in this construction, as in the construction of Figure 4, again to ship the unit knocked down and assemble it upon delivery.

A basket 31 has therein three holes through which bolts 38 may be projected for threaded engagement with the mounting unit 28 to hold the bell 3 in position by pressure between the basket 3'! An ear having therein a hole 39, and a tapped opening 40 may be provided for mounting the unit as may be desired. In Figures 6 and 7 I have illustrated a form of basket which may be substituted for the basket 3] of Figure 4. This basket has three holes 4 , 42 and 43 through which the bolts 38 may be passed for threaded engagement with the mounting unit 28 to hold the bell 3 in position.

These 5 bolts 41 and 48 then provide mounting members on which a bracket may be mounted for supporting the unit in any desired position. The use of a basket such as that shown in Figure 4 or in Figures 6 and 7 eliminates the drilling of three holes in the bell as in Figure 1.

The holes 4 , 42, 43, Figure 7, may be cast therein. The basket of Figures 6 and 7 also avoids the necessity of drilling two holes for mounting as is required in the case of the basket of Figure 4. It also permits the use of a U-shaped bracket for mounting without any drilling in the basket as the holes 46 may be cast therein. It will be obvious to those skilled in the art that my invention is capable of various modifications and I do not desire therefore to be restricted to the particular details shown and described but only within the scope of the appended claims.

A doubly folded loudspeaker comprising a tone arm consisting of a generally cylindrical sleeve, a plug within said sleeve and integral therewith, a sound reflecting member encompassing said sleeve, said reflecting member being secured to said plug at one end thereof, said sleeve being threaded at its opposite end and receiving a driver unit, a bell member for reflecting sound from said reflector, said bell member having an open mouth at the end opposite said driver unit and an aperture in the end adjacent said driver unit, and a shoulder on said driver unit, said shoulder serving to secure said bell member rigidly between said sleeve and said driver unit.

A doubly folded loudspeaker comprising a tone arm consisting of a generally cylindrical sleeve, a plug within said sleeve and integral therewith, a sound reflector having a closed end secured to said plug at one end thereof, said reflector substantially encompassing said sleeve, a driver unit, said unit being threadedly mounted 45 in the end of said sleeve opposite the point of securing said reflector to said plug, a shoulder on said driver unit, a bell member for reflecting sound from said reflector, said bell member encompassing said reflector and.

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User manual Bogen Communications SPT15A Reentrant Horn Loudspeaker SPT15A

The Bogen KFLDS30T is a wide dispersion, high-intelligibility, reentrant-type horn loudspeaker designed for applications where wide angle projection and directivity is a necessity. The flare-shaped horn can be rotated to project wider dispersion in either the horizontal or vertical plane. Its sturdy, weatherproof, polycarbonate and aluminum construction is ideal for both indoor and outdoor use. Screw terminals make installation fast and easy. Click to zoom in. Rating Required Select Rating 1 star worst 2 stars 3 stars average 4 stars 5 stars best. Email Required.

Single Drivers & Accessories - Re-Entrant Horn Speakers. Visatonshop. Built-in horn speaker. ,12 € ,70 € * Weight 1 kg. More information.

Re-Entrant Horn Speaker with 25V/70.7V-30W Transformer


This sturdy, weatherproof speaker has an all-metal construction and uses screw terminals for a simple installation. The SPT15A is easy to install and easy to maintain as well, with its self-aligning, field replaceable diaphragm. If you own a Bogen Communications install speakers and have a user manual in electronic form, you can upload it to this website using the link on the right side of the screen. Not specified by the manufacturer. The manual also provides troubleshooting for common problems. Even greater detail is provided by the service manual, which is not typically shipped with the product, but which can often be downloaded from Bogen Communications service. If you want to help expand our database, you can upload a link to this website to download a user manual or service manual, ideally in. Your e-mail will not be displayed or otherwise used in any way. Can't find what you're looking for?

Bogen 30 Watt ReEntrant Horn Loudspeaker

reentrant horn loudspeaker

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The Inter-M HS-S20 is a professional grade 20W Horn Speaker for use in environments where clear, precise voice messages, announcements or emergency tones or signals are required. Log in to your Account.

Weatherproof Metal Horn Loudspeakers


To edit this page simply login to the control panel, click the Website Content tab and choose the View Web Pages option. A sample returns policy is shown below which you can edit as needed. You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error you received an incorrect or defective item, etc. You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly.

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JavaScript seems to be disabled in your browser. You must have JavaScript enabled in your browser to utilize the functionality of this website. Email to a Friend. Be the first to review this product. This Horn Speaker counts with a detachable mounting bracket, which includes a wing-nut locking device, provides precise positioning of the horn in the vertical and horizontal planes. The unit is finished in textured mocha enamel. Excellent intelligibility, handsome compact styling, and all metal, weatherproof construction make the model IH8A perfect for use indoors or outdoors with Bogen sound equipment. All returns require prior authorization, please.

FMH15T Flange-Mounted Reentrant Horn Loudspeaker (15 Watt).

FourJay 140/70-TD 40 Watt Re-Entrant Horn Speaker

The GAT speaker is a utility horn perfectly suited for voice paging and music transmission. Double re-entrant horn construction optimizes speaker output to penetrate ambient sound levels. Unit is also equipped with wiring for an 8-ohm connection to facilitate installation when a transformer is not required.

Bogen Communications KFLDS30T Wide Dispersion Reentrant Horn Loudspeaker 30W

RELATED VIDEO: Diy horn speakers at home. How to made horn speakers

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A horn loudspeaker is a loudspeaker or loudspeaker element which uses an acoustic horn to increase the overall efficiency of the driving element s. 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.

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