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What is stereo?




There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.




H.H. Scott '59





Showing posts with label full-range. Show all posts
Showing posts with label full-range. Show all posts

Magneplanar MG-IIc speakers

Magneplanars provide unique styling not available in box speakers. With optional trim and fabrics, Magneplanar Screens can blend or contrast with the surrounding decor, thus forming a backdrop in the same manner as curtains or drapes. With Magneplanars you have the ability to add a pair of speakers to your living area without adding the visual "weight" of box speakers. Magneplanars are easily moved for vacuuming or repositioning to other listening areas.

 

Magneplanar MG-IIc (and MG-Ic), these models are of similar design , both representing excellent value. The MG-IIC is one foot taller than the MG-Ic, providing better vertical dispersion and extension of the frequency extremes. Both models appeal to a wide range of listening tastes. For the classical music enthusiast, the critical midrange of the MG-IIc is often the speaker of choice. Having been introduced in their original versions many years ago, these speakers have benefited from years of gradual refinements.

They highlight Magnepan's belief that there should be no change for the sake of change. Improvements over earlier versions include a reduction in diaphragm mass, refinements in magnetic structure, improved crossover design, more rigid panel construction, inclusion of bi-amplification option, and improved diaphragm mass distortion.

Both models are worthy of the finest ancillary equipment and source material, and are remarkable in their respective price ranges.

 


Specifications

System :  Two-way full-range dipole radiator

Midrange/Bass Radiating Area:  500 sq/inch

Tweeter Radiating Area:  68 sq/inch

Frequency Response :  40 Hz - 18,000 Hz ±4 dB

Minimum Power Requirement:  50 watts RMS

Maximum Recommended Power :  can be safely used with amplifier up to 200 watts RMS per channel, when fused per instructions

Sensitivity:  84 dB (1 Watt/ 500 Hz / 1 m)

Impedance:  5 Ω  at any frequency (purely resistive)

Crossover System:  400 Hz to Low-pas); 1600 Hz to High-pass (6 dB/octave)

Finish:  Panels covered with off-white, black or brown fabric, with oak trim

Dimensions (W x H x D) :  22" x 71" x 2"

Weight:  45 lbs (each)

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)

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

Lowther Acousta (1960)

 This extremely well designed enclosure is engineered to complement the Lowther PM6 Drive Unit, providing a performance throughout the audible range that is quite outstanding.
The Acousta employs a folded horn, or exponential labyrinth, which operates from the rear of the drive unit. This structure produces the necessary diaphragm loading at the resonant point of the loudspeaker and provides a reinforcement of the frequencies in the bass range, resulting in a smoother and extended bass response with negligible distortion. The high and mid-range frequencies are obtained by direct radiation from the front of the loudspeaker.
 The Acousta enclosure, moderate in size and price, is ideally suited for contemporary living - without in any way sacrificing performance. Two of these enclosures for stereo reproduction provide a realism in sound that must be heard to be believed. They are offered in both a De Luxe and Standard form.  Standard finishes available are walnut and mahogany. Workmanship throughout is executed by skilled craftsmen, thus ensuring that both performance and appearance are of the highest order. The Acousta is also offered in kit form, allowing the builder to enjoy all the superior performance of this enclosure at a great saving in cost.

Specifications
Acousta Standard
Dimensions (W x H x D):  18-5/8"x 34" x 16-1/2"
Weight:  50 lbs net
Acousta De Luxe
Dimensions (W x H x D):  21" x 34" x 17-1/2"

Weight:  50 lbs net

Philips EL-7040

This 30 W loudspeaker gives uniform, undistorted sound reproduction over a frequency range of 35 to 10,000 c/s. excellent bass reproduction is obtained owing to the very flexible suspension and centring of the cone. As the air gap is longer than the moving coil, the latter always vibrates in a homogeneous field, thereby excluding sound distortion, even at lerge amplitudes of the cone.

The core of the magnetic system is lined with brass; the eddy currents generated in this brass lining damp the natural resonances of the cone and improve the transient reproduction. Moreover, owing to the brass lining, the impedance in the high-frequency range increases less than with other loudspeakers.
The heavy magnet of Ticonal steel will not be misaligned, even if subjected to violent shocks.
The frame is of die-cast aluminium.
All parts are cadmium-plated or impregnated to avoid corrosion.

Specifications
Frequency Range:  35 - 10,000 Hz
Power:  30 watts
Dimensions:  12" cone diameter
The loudspeaker is available in two versions:
Type EL 7040/00 :  with matching transformer for 100, 70 and 50 V, impedance 335, 165 and 85 ohms (respectively)

Type EL 7040/01 :  without transformer, impedance 5 ohms.

Axiom 80 for Goodmans

The Goodmans Axiom 80 is a 10-inch, twin-cone, full range loudspeaker, whose performance, in a prpoer enclosure is as astounding as its unique design.

The most revolutionary advance embodied in the Axiom 80 is its achievement of free cone suspension - the theroretical ideal that permits the cone to move as a true piston at low frequencies, without restriction and without distortion.

Another direct result is that the fundamental resonance of the Axiom 80 is only 20 cycles - lower than that of any other commercially available loudspeaker.

The new ARU Friction Loaded Enclosure represents the perfect solution to the enclosure requirements of this superb reproducer. The axiom 80, mounted in a Model C-1800 ARU Enclosure, will reproduce true bass fundamentals down to 20 cycles - with no "hang-over" and without peaks above that frequency. Mid-range reproduction is clean and articulate and the :highs" smooth to 20,000 cycles. All of this is accomplished without the use of special "tweeters" and elaborate crossover networks.

Power handling capacity of the single Axiom 80/ARU system is entirely siutable for use in most home systems (8 -12 watts, continuous program material: 4 -6 watts , RMS sine wave). Where greater power handling is desired, two Axiom 80 loudspeakers may be used together in the Model B-2800 ARU Enclosure or four may be used in the Model A-4800.

No multi channel system, however elaborate or costly, cansurpass in performance these dual and quadruple Axiom 80/ARU systems.

ARU Enclosures are now available in easy-to-assemble kits, supplied complete with the necessary precut lumber, grille cloth, padding, glue, hardware and the all-important ARU Acoustical Resistance Unit.

Astounding performance from 2o to 20,000 cycles with a single channel speaker system.

Goodmans "free suspension" Axiom 80 Loudspeaker in "friction loaded" Aru enclosure


Dimensions (H x W x D):

Model C-1800 (for 1 Axiom 80): 24" x 18" x 16"

Model B-2800 (for 2 Axiom 80): 26" x 20" x 20"

Model A-4800 (for 4 Axiom 80): 30" x 24" x 20"