mbl Magnetostatic Super Tweeter

MBL Magnetostatic Super Tweeter

Over the 28 mm dome a new magnetostatic driver is used as a super tweeter. The decision to use this design is the result of some fundamental physical considerations. For the representation of frequencies exceeding 30 kHz in an authentic way only a ribbon tweeter, electrostatic or, as in this case, a magnetostatic transducer can be considered. Ribbons and electrostats have disadvantages compared to a genuine magnetostat. For example an electrostat requires a separate high voltage power supply to the transducer and has a smaller dynamic range as compared to a magnetostat. A ribbon tweeter does not offer the longterm stability and has a very narrow sound dispersion.

Only the magnetostat comprises all the advantages such as:

Extremely low mass, resulting in a perfect transient response.

High dynamics transparency and fidelity in detail

No partial oscillation

Good radiation characteristics

Linear frequency range up to over 50 kHz

Accustically neutral foil - no sonic signature

Constant impedance

Very high long-term stability

I like

Bell HF-2240

High Fidelity sound at moderate cost.

Bell Coaxial Loudspeaker - to hear it is proof conclusive that you can have.

Here is the long sought for ideal. A twelve-inch coaxial speaker in which top-flighy electronic engineering, acoustical designing, and the best of materials are combined, to satisfy the high fidelity enthusiast's ear, at a price he can afford.

In this Bell Loudspeaker an efficient low-frequency driver cone is teamed with a high frequency radiator, coaxially mounted, to reproduce both voice and music with unusual audio faithfulness. Cone and radiator are acoustically arranged for distribution of sound over a wide room area. From felt buffer mounting rim to its heavy Alnico Vmagnet, the Bell Model HF-22440 is engineered for output which  - measured by ear or instrument - is uniformly smooth and flat in the "presence" region.

This speaker has been carefully designed for use with any one of Bell's High Fidelity Amplifiers.

Specifications:

Rated Wattage:  30 watts

Voice Coil Diameter:  2"

Frequency Response:  38 - 13,600 kHz ±6 dB

Voice Coil Impedance:  8 Ω

Crossover Frequency:  2400 kHz

Magnet:  Alnico V

Weight:  1 lb

Overall Size:  12-1/8" diameter

Depth:  6-1/2"

Baffle Opening:  11" diameter

Shipping Weight:  9 lb

Goodmans Axiette 8

 Here is the new model of the world famous Axiette - smallest true high fidelity loudspeaker produced.

The Axiette 8 retains the best features of the original Axiette: teh unique hyperbolic diaphragm, plastic terminated, and aluminum drive coil. In addition, it features a new and brilliantly conceived die-cast chassis whose unitary design retains all parts in precise alignmentt. The slender lines of the Axiette 8 are made possible by the use of a cmpletely new magnet system with a Feroba II permanent magnet.

Feroba II is a high efficiency anisotropic sintered material whose properties enable considerable reduction in magnet assembly depth.

The Axiette 8 requires an enclosure volume of only 3,000 cubic inches. Thus it can be used  i the most compact installations, while its power handling capability of 6 watts is more than adequate for many domestic systems.

 Features:

Smallest true high fidelity loudspeaker madde

New precision built diecast chassis brilliantly designed, with up-to-date slim profile

Completely new magnet system incorporating Feroba II permanent magnet

Designed and produced by goodmans -- with 35 years' experience in this highly specialised industry

Enclosure volume requirement only 3,000 cu. In.

Specifications:

Frequency Range:  40 - 15,000 Hz

For Amplifiers Up To:  6 watts (12 watts USA)

Fundamental Resonance:  65c/s

Flux Density:  13,500 Gauss

Total Flux:  53,000 Maxwells

Voice Coil:  1' diameter aluminium

Impedance:  15/16 Ω

Chassis: Diecast

Baffle Hole Diameter:  178 mm (7")

Overall Diameter:  210 mm (8-9/32")

Overall Depth:  92 mm (3-5/8")

Nett Weight:  1,81 kg (4 lbs)

Celestion CX 2012

 Celestion 12" Co-axial Loudspeaker

Handling 20 watts RMS and covering a frequency range of 30 Hz to 18 kHz, this loudspeaker has a moulded foam surround and a horn-loaded treble unit. This treble unit gives wide dispersion of the high frequencies and has a "brilliance" control so that the level can be adjusted to suit room conditions

Features:

1.Hi-Flex "free" surround - provides high compliance, eliminates standing waves and surround resonance. Guaranteed moisture resistant. 

2.Two Voice Coils - extra long bass voice coil and precision mounted H.F. coil ensure clean extended frequency coverage. 

3.Compression horn loaded treble unit - for linear and wide angle distribution of high frequencies.

4.High flux ceramic magnets - ensuring high input/output ratio

5.Pure electrical cross-over - provides smooth frequency transition and feed to the appropriate voice coil

6.Rigid die-cast chassis - giving permanent precision alignment

7.High Frequency level - or "brilliance" control allows adjustment of high frquency level to suit room conditions. Complete with 30" of cable, escutcheon and control knob

Specifications:

Overall Frequency Response:  30 Hz - 18 kHz

Power Handling Capacity:  20 watts RMS 40 watts peak

Fundamental Resonance Frequency:  35 Hz

Crossover Frequency:  4 kHz

Impedance:  15/16 Ω

Ceramic Magnet: 

Flux Density :  17,000 Gauss

Total Flux :  180,000 Maxwells

Voice Coil:

Bass :  44 mm (1 ¾") diam.

Treble :  25 mm (1") diam. Aluminium Wire

Chassis (Die-cast Alloy):

Overal Diameter :  317 mm (12 ½")

Overal Depth :  139 mm (5 ½")

Baffle Hole:  279 mm (11")

Net Weight:  7,5 kg (16 lb 110 oz)

Weight (including packing):  8,6 kg (19 lb)

Electro Voice 12 TRXB

 Integrated 3-way speaker Features:

Massive die-cast frame

Viscous damped cloth suspension

Ceramic magnet

Integral Sonophase VHF driver

Incorporating  all the design advantages of the famous Electro-Voice Radex Caaxial principle, the Electro-Voice Model 12 TRXB integrated 3-way loudspeaker includes, also, the latest developments in the reproduction of the highest audible frequencies through the use of an integral Super Sonax VHF driver.

The  12 TRXB emplous the Model T35B VHF driver base response is excellent, affording pleasing musical balance without the masking effects previously experienced from extended high frequency reproduction.

 The 12 TRXB loudspeaker is designed to meet optimum listening requirements; latest developments incorporated insure even, smooth coverage of the entire listening area. The engineered features of the Electro-Voice integrated 3-way speaker system include true oncentric mounting of all reproducing elements; augmented balanced bass response in conjunction with smooth, extended high frequency reproduction, carefully tailored mid-range characteristic to provide realism and a considerable degree of "presence" at usual sound levels. The 12 TRXB incorporates in the high frequency section the Sonophase throat design.

The importance of the Sonophase throat design is paramount above 12 kc, where sound must b taken from the center of the diaphragm and the outer periphery simultaneously.

At lower frequencies, where the diaphragm is a piston, and no phase shift is required in the path configuration, the longer central path length does not appreciably change the phase due to the longer wave lengths involved. Further benefits are affored in the high frequency section of the Electro-Voice integrated 3-way speaker systems by the incorporation of Electro-Voice developed diffraction horns as the method of achieving the best dispersion. In stereophonic use especially, a 3 dB concentration of sound in one portionof the subject, with the resultant distortion of the solid or stereo effect. An adjustable "brilliance" control is incorporated to allow matching of response to room acoustic, compensating for high frequency absorptive efects of heavy drapery and soft frnishhings; crossover network with full 12 dB per octave slope minimizes distortion; edgewise-wound aluminum voice coil design affords 18% more efficiency and consequent damping of transient distortion.

Specifications:

Frequency Response:  35 to 18,000 Hz

Electrical Crossover:  Integral 3500 Hz

EIA (RETMA)  Sensitivity Rating:  52 dB

Power Handling Capacity:

Program Material :  20 watts

Peak :  40 watts

Nominal Impedance:  16 Ω

Voice Coil Diameter:

Woofer :  2 ½ inch

Tweeter :  1 inch

Magnet Weight:  1 lb 9,16 oz

Gauss: 

Woofer :  12,000 G

Tweeter :  9,000 G

Dimensions  (diam.  x  deep):  12 ¼ inch x 7 inch

Mounting:  four 9/32 holes on an 11-1/2in circle

Baffle Opening:  10 ½ inch

Net Weight:  11 lbs

Goodmans Triaxiom 212

 Need proff of the clear, clean, true sound reproduction of a loudspeaker by Goodmans. First, check the response curves charted below.

They dramatically reveal the smooth, undistorted frequency response over the audio spectrum. Translated into musical terms, the Goodmans speaker reproduces sound with proper balance, clarity and realism … achieving perfect separation of instruments, peak-free highs and well-defined, clear bass tones. This quality instrument is the perfect example of British precision and craftsmanship.

One of the many outstanding custom features on all goodmans speaker is the "Rigid-Flex" cone … a completely flexible, free-floating cone rim and completely rigid cone center to provide pure piston action.

Triaxiom 212 Features:

Finest value ever offered in an integrated 12" three-way loudspeaker.

Extra-heavy, high-efficient magnets for maximum performance.

Smooth, undistorted response from 20 to 20,000 Hz.

Unusually sturdy construction with rigid, die-cast chassis.

Power handling capacity is 25 watts

Total flux is 178,000 Maxwells.

ElectroVoice Wolverine LS15

 "Now Wolverine by Electro-Voice adds a great new 15 inch Full-Range Loudspeaker.

By popular demand! You have asked your dealers for Wolverine quality in this authortative size. Here it is! And look what you get - only in  Wolverine - where both price and quality still amaze the experts."

Now, a complete selection of 8", 12" and 15" models in the unequaled value of Wolverine.

Five Outstanding Features

1. Rugged , one piece Die Cast Frame gives maximum durability.
2. Long Throw Voice Coil overcomes distortion characteristic of wide diameter, short throw coils.
3. Edgewise Wound Copper Voice Coil is 18% more efficient.
4. Reinforced Fiberglass Coil Form provides rigid circular assembly.
5. Dual Cone Construction produces extended high frequency response.

The Wolverine LS15 loudspeakers are designed to operate effectively both as full-range speakers and as woofers in multiway systems.  Full-range reproduction is enhanced by the exclusive Radax design.

The dimensions, mass and location of the coaxially mounted radax cone have been carefully chosen for maximum improvement of the speaker's high-frequency performance. Carefully selected and specially treated cone material assures extended bass response, affording pleasing reproduction of all low frequencies normally encountered in music.

When used as full-range units, they provide optimum sound reproduction at a minimum cost.

Wolverine Step-Up Kits provide a simple method for increasing performance of your loudspeaker system in stride with the budget,by building from a single loudspeaker to a deluxe 3-way system with properly matched components, and without obsoleting existing components.

Specifications

Frequency Response:  35 to 14,000 cps

Nominal Impedance:  8 Ω

Power Handling Capacity:

Program :  20 watts

Peak :  40 watts

Voice Coil Diameter:  2"

Magnet Weight:  13 oz. Cer. Indox

Nominal Resonance:  50 cps

EIA Sensitivity Rating:  47 dB

Dimensions (dia. x depth):  15-1/8" x 6-11/32"

Net Weight:  9 lbs

Baffle Opening:  14"

Mounting:  Four 9/32" holes equally spaced on circle of 14½"

ElectroVoice Wolverine LS15

 "Now Wolverine by Electro-Voice adds a great new 15 inch Full-Range Loudspeaker.

By popular demand! You have asked your dealers for Wolverine quality in this authortative size. Here it is! And look what you get - only in  Wolverine - where both price and quality still amaze the experts."

Now, a complete selection of 8", 12" and 15" models in the unequaled value of Wolverine.

Five Outstanding Features

1. Rugged , one piece Die Cast Frame gives maximum durability.
2. Long Throw Voice Coil overcomes distortion characteristic of wide diameter, short throw coils.
3. Edgewise Wound Copper Voice Coil is 18% more efficient.
4. Reinforced Fiberglass Coil Form provides rigid circular assembly.
5. Dual Cone Construction produces extended high frequency response.

The Wolverine LS15 loudspeakers are designed to operate effectively both as full-range speakers and as woofers in multiway systems.  Full-range reproduction is enhanced by the exclusive Radax design.

The dimensions, mass and location of the coaxially mounted radax cone have been carefully chosen for maximum improvement of the speaker's high-frequency performance. Carefully selected and specially treated cone material assures extended bass response, affording pleasing reproduction of all low frequencies normally encountered in music.

When used as full-range units, they provide optimum sound reproduction at a minimum cost.

Wolverine Step-Up Kits provide a simple method for increasing performance of your loudspeaker system in stride with the budget,by building from a single loudspeaker to a deluxe 3-way system with properly matched components, and without obsoleting existing components.

Specifications

Frequency Response:  35 to 14,000 cps

Nominal Impedance:  8 Ω

Power Handling Capacity:

Program :  20 watts

Peak :  40 watts

Voice Coil Diameter:  2"

Magnet Weight:  13 oz. Cer. Indox

Nominal Resonance:  50 cps

EIA Sensitivity Rating:  47 dB

Dimensions (dia. x depth):  15-1/8" x 6-11/32"

Net Weight:  9 lbs

Baffle Opening:  14"

Mounting:  Four 9/32" holes equally spaced on circle of 14½"

Lowther PM6

 PM6 Drive Unit for use with Acousta Enclosures

The PM6 is an 8 inch twin cone unit of similar design to the PM3, plastic foam suspension, aluminum voice coil and a modified form of Stabilizer being used in the construction.

 The magnetic structure, lathough not as large as on the PM3, nevertheless produces a gap flux of 17,500 gauss - well above comparable units. All the benefits attendant with such a large magnetic field are derived - minimum transient distortion - greater efficiency - improved high frequency response. The PM6 has been designed for use in enclosures which provide direct high and mid-frequency rediation and produce the necessary rear loading in the bass range. Mounted in such an enclosure the full capabilities of this drive unit will be realized, ensuring smooth extended bass reproduction free of "boom" and " one not bass", while in the upper range, reproduction will be well balanced and crisp-yet not tiring.

The performance of the Acousta  - or any similar enclosure - will be greatly enhanced when used with the PM6 drive unit,

Due to the high order of efficiency of the PM6, fusing is recommended in order to prevent damage resulting from overloading of the unit.

Specifications

Frequency Range:  20 - 18,000 Hz

Gap Flux:  17,500 gauss

Power rating:  25 Watts (Integrated program material)

Impedance:  16 Ω

Dimensions:  8½" (High) x  8" (Wide) x 5" (Deep)

Weight:  6,5 lbs

Mordaunt-Short DSB 208

DSB 208 Low distortion bass-and mid-frequency transducer.

Mordaunt-Short's bass-and mid-frequency transducer, the DSB208, is a versatile high performance unit designed for the accurate reproduction of programme material at realistic sound levels.

 By combining a long-throw voice coil, linear suspension, critically damped cone and compliant roll surround, the DSB208 shows to greatest advantage when the unit is used with advanced amplifiers of high power; nevertheless, the acoustic efficiency of the unit is such as to enable it to enhance the output of quality amplifiers even of low power ratings.

Specification:

Nominal Frequency Range:  20 - 5,000 Hz.

Impedance:  8 Ohms nominal.

Nominal Sensitivity:  6.5 V r.m.s (5.3 watts) to produce 96 dB at 1 metre in anechoic condition using pink noise.

Fundamental Resonance:  30 Hz in free-air.

Continuous Programme Rating:  20 V r.m.s (50 watts) contoured random noise when operating within frequency range 25 - 5,000 Hz.

Chassis:  208 mm nominal diameter, zinc plated heavy gauge steel.

Magnet:  High flux assembly employing 90 mm diameter ceramic ring.

Cone:  140 mm diameter; heavy duty impregnated paper specially treated with viscous damping materials.

Surround:  Ultra-linear, compliant, inverted-roll surround of a synthetic material inherently self damping.

Voice Coil:  26 mm diameter, long throw, high temperature coil, wound on laminated former.

Dimensions:  Diameter: 208 - 244 mm;  Depth: 112 mm.

Weight:  1.5 kg

The Fisher Speaker System

 Illustrated is an articulated, dual coaxial speaker system, shown in cutaway form to reveal its unusual design. It is the standard equipment on every Fisher instrument and combines a 15'' bass speaker with a horn-type high frequency speaker, both equipped with Alnico-5 magnets. This system features smooth response, minimum distortion and exceptional polar distribution and presence. A dividing network is provided to channel the upper treble and overtones to the high frequency unit and middle and low tones to the massive bass speaker. A multicellular horn system is available optionally at additional cost.

Illustrated is the greatest development of the last ten years in fine  sound reproduction for the home. It is a multicellular-horn coaxial speaker utilizing two driving units. The larger is designed to handle with exceptional efficiency the first 5-1/2 octaves of he scale. The second unit, small in size, is built with the microscopic accuracy of a fine watch. This mechanism converts to acoustic energy the rapid and delicate pulses of the higher tones and overtones. A nest of eight\ exponential horns diffuses the ordinarily bullet-like  higher tones over an angle of eighty degrees! This speaker system is optional equipment on the Fisher.