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

AVID Model 105 (1975)

The Avid Model 105 loudspeaker is the new reference standard for the critically acclaimed Avid "Series 100" line of loudspeakers. The result of extensive research, the Avid Model 105 is unquestionably the finest speaker we have maade.

Design Accomplishments

Uniform distribution of sound at all frequencies

Superior transient response characteristics

Exceptionally low distortion bass, even at high power levels

Broad, linear frequency response

"No compromise" reference monitor performance

Basic Design

All loudspeaker design involve trade offs between low frequency response efficiency and cabinet size Avid's engineers selected a floor standing, air suspension design to achieve the exceptionally low bass response, accurate reproduction and power handling capability expected in a "no compromise" reference standard monitor. The Model 105's large cabinet volume (2,3 cu. ft.) permits a flat response to 30 Hz while maintaining sufficient efficiency for use with 25 watt RMS to 200 watt RMS amplifiers.

The model 105 is a 3-way design employing five perfectly matched drivers carefully integrated by a sophisticated coil-capacitor dividing network. Several exceptional "state-of-the-art" design features are used in the Model 105 which deserve highlighting.

Long-Throw Woofer

The Model 105 employs a specially engineered 12' woofer with exceptional linearity and a long-throw (11/16"excursion) voice coil to achieve low distortion bass

"Basketless" Mid-Range

The Model 105's optimallysized 3" mid-range driver utilizes a new basketless construction which eliminates interior wave reflections that occur from the basket frame. such reflections cause irregularities in frequency response and degrade transient characteristics in conventional designs. Midrange frequencies in conventional design. Midrange frequencies are incredibly smooth and accurately reproduced with this advanced design.

High Frequency Driver Array

In addition to the superb 1" dome tweeter radiating forward, two auxiliary tweeters are employed to provide full 180 degree dispersion of high frequencies. The auxiliary tweeters are fired directly to the side rather than "angled off" to minimize interference effects with the front facing tweeter - a common problem that causes a peaky high end response on many multiple tweeter systems.

Zero Distortion Dividing Network

Drivers are perfectly integrated by an Avid-engineered dividing network utilizing only linear, zero distortion components such as air core coils.

The performance date below attest to the superb accuracy, smooth response and low distortion achieved by this system, but still fail to adequately portray the Model 105's incredibile openness and transparency which must be heard to be appreciated.

Frequency Response: is exceptionally flat, both on and off-axis, over the entire listening range from 30 Hz to beyond 18 kHz.

Low Frequency Distortion: we know of no other loudspeaker system with the Model 105's low distortion bass performance. There is less than 4% distortion at 40 Hz with an incredible 50 watts input.

Tone Bursts: are one of the best indicators of transient response: the ability of a speaker to accurately follow rapidly changing musical waveforms Note how well the Model 105 followes the 8-cycle input signal with minmum "hangover" and "blurring". These are exceptional toneburst responses, especially in the critical mid-range area.


Impedance: 8Ω nominal, 6Ω minimum

Power Handling Capacity: 200 watts RMS (program material with fuse overload protection)

Minimum Recommended Amplifier Power: 25 watts RMS

Frequency Range: 30 Hz to 18 kHz ±2.5 dB

Driver Complement:

Woofer: 12" high compliance w/butyl surround, 11/16" peak-to-peak excursion, 2½ lb. ceramic magnet; 2" 4-layer voice coil

Mid-Range: 3" air suspension cone with 1" high temperature voice coil, half-roll surround

Primary High-Frequency: 1" high velocity plastic dome with 1" low-mass voice coil

Auxiliary High-Frequency Drivers: Two side-firing , 1" wide dispersion cone tweeters

Crossover Network: coil/capacitor; 5 air core coils, 5 capacitors, 9 wire-wound resistors.

Low-Mid Crossover: 500 Hz

Mid_High Crossover: 4000 Hz

Auxiliary H-F Crossover: 9 kHz

Balance Controls: Two front-mounted, switch type constant impedance L-pad attenuators for mid- and high-frequencies, precalibrated flat, +2 dB, -2 dB.

Cabinet Size (W x H x D): 20" x 26¼" x 15"

Cabinet Finish: Hand rubbed walnut veneer over high density (45 lb) particle board

Grille Assembly: Acoustically integrated with system to minimize cavity resonances and diffraction effects: dark brown grille

System Weight: 75 lbs

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