VINTAGE ELECTRO-VOICE MODEL B-1150M 2-WAY STAGE BASS SYSTEM 200W
Description
Will accept reasonable offers
Serial Number: 1700132971
Date: June 1986
DESCRIPTION
The Electro-Voice Model B-1150M is a fresh new approach to bass guitar speaker design. Bass speakers have been evolving from the traditional "dull" bass guitar sound to the wider range high fidelity bass sound.
Electro-Voice has taken this process one step further by adding our exclusive vented midrange cone speaker (VMR), enabling the performer to achieve a full, powerful sound with clarity and articulation that simply is not available from standard bass speaker designs.
The enclosure is constructed of Road-Wood.
- A structural material made of layered and selectively oriented hardwood stands.
The covering is abuse-resistant black carpeting.
The VMR features a 6-inch cone coupled to a massive 16-lb magnetic structure.
- the same size we use for our larger woofers
- to cover the range of frequencies, 600 Hz and above.
This EV innovation represents a unique way of providing high acoustic output and efficiency from a compact direct-radiator form of the loudspeaker.
In addition, greater dispersion is obtained at the high end which offers listeners off-axis of the speaker system, the same brilliant sound and clarity as on-axis.
The VMR gives the musician a new freedom in exploring creative percussive bass sounds.
The low-frequency section was specifically designed for the bass guitar utilizing the EVM-15L 15-inch musical instrument loudspeaker.
Using Thiele/Small parameters performance was optimized for maximum efficiency down to 40 Hz and minimum speaker diaphragm excursion at the lowest bass tones.
This allows you to obtain maximum acoustic output without the speaker bottoming under any normal playing conditions.
The B-1150M is a two-way system containing one EVM-15L low-frequency speaker and one VMR in a 4 cubic-foot enclosure.
ENCLOSURE CONSTRUCTION
The B-1150M enclosure utilizes a structural material that combines the strength of high-quality plywood with the density and acoustic damping of particle board without the brittleness.
Road-Wood uses the same principle of crossbanding veneers, as in plywood, in order to achieve its very high rigidity.
A tough liquid-phenolic resin is blended with long, narrow strands of hardwood.
Alternate layers are perpendicularly bonded under intense heat and pressure to form panels of superior uniformity.
Unlike many grades of plywood, Road-Wood is dimensionally stable, water resistant, and free from voids.
A combination of the dado cut joints, tough adhesives, and proper bracing ensures a sonically dead enclosure free from panel resonances.
The densely woven, industrial-grade, abuse-resistant carpeting provides a finish that is both attractive and highly durable.
Large, heavy-duty metal corner protectors, firmly secured rubber feet and recessed handles complete the picture and ensure that the B-1150M speaker system is ideally suited to long and reliable life "on the road."
APPLICATIONS
The B-1150M is a speaker system designed for the bass guitarist.
The B-1150M has a "lighter" sound preferred by many jazz bass players.
It is also ideal for studio use.
FREQUENCY RESPONSE
The combination of the 15-inch woofer and vented midrange provide the wide and smooth overall response shown in Figure 1.
The response was measured at 10 feet using a swept 1/3-octave input of 4 volts; no external equalization was used.
DIRECTIVITY
The advantage of using the VMR is shown dramatically in the polar response curves of Figure 2.
The curves of the B-1150M at 4 kHz are shown with the EVM-15L only and the VMR only.
The more narrow curve is that of the EVM-15L which shows that at a frequency of 4 KHz the EVM-15L is becoming very directional.
This same effect holds true for other high frequencies as well.
Such a response is quite typical for 15-inch speakers in general because the larger the diameter of the speaker, the more directional the response is at higher frequencies.
Although a 10 or 12-inch speaker would show some improvement, the same problem would still exist. This is the reason Electro-Voic adds the VMR.
The broader, more uniform curve of the VMR means that the angle of coverage is greater.
This makes the brighter bass guitar sound possible and distributes this sound evenly throughout the performing area.
POWER HANDLING CAPACITY
To our knowledge, Electro-Voice was the first U.S. manufacturer to develop and publish a power test closely related to real-life conditions.
First, we use a random noise input signal because it contains many frequencies simultaneously, just like a real voice or instrument program.
Second, our signal contains more energy at extremely high and low frequencies than a typical actual program, adding an extra measure of reliability.
Third, the test signal includes not only the overall "long-term average" or "continuous" level
- which our ears interpret as loudness
- but also short-duration peaks which are many times higher than the average, just like the actual program.
The long-term average level stresses the speaker thermally (heat).
The instantaneous peaks test mechanical reliability (cone and diaphragm excursion).
Note that the sine wave test signals sometimes used have a much less demanding peak value relative to their average level.
In actual use, long-term average levels exist from several seconds on up, but we apply the long-term average for several hours, adding another extra measure of reliability.
Specifically, the B-1150M is designed to withstand the power test described in EIA Standard RS-426.
The EIA test spectrum, the output of a white noise generator (white noise is a particular type of random noise with equal energy per bandwidth in Hz) is fed to a shaping filter with 6-dB-per-octave slopes below 40 Hz and above 318 Hz.
When measured with the usual constant-percentage bandwidth analyzer (one-third octave) this shaping filter produces a spectrum whose 3-dB-down points are at 100 Hz and 1,200 Hz with a 3-dB-per-ocatave slope below 1,200 Hz.
This shaped signal is sent to the power amplifier with the continuous power set at 200 watts into the 6 ohms EIA equivalent impedance for the B-: 150M. Amplifier clipping sets instantaneous peaks at 9 dB above the continuous power or 1,600 watts peak for the B-1150M.
This procedure provides a rigorous test of both thermal and mechanical failure modes.
GRILLE REMOVAL
The grille assembly of the B-1150M is fastened to the enclosure using sturdy dual-lock fasteners.
The grille assembly can be removed quickly and easily, allowing access to the drivers, by firmly pulling on the two black polyester ribbon loops provided.
SPECIFICATION
Useable Frequency Response:
40-5,000 Hz
Half-Space Reference Efficiency
6.2%
Long-Term Average Power Handling
Capacity Per EIA Standard RS-426-A
(See Power Handling Capacity section)
200 watts
Maximum Woofer Acoustic Output
12.4 watts
Sound Pressure Level at 1 Meter
1 Watt Input, Anechoic Environment
Band-Limited Pink Noise Signal
103 dB
Distortion, 0.1 Full Power Input
Second Harmonic 100 Hz: 1.5%
Second Harmonic 1,000 Hz: 3.0%
Third Harmonic 100 Hz: 1.5%
Third Harmonic 1,000 Hz: < 1.0%
Distortion, 0.01 Full Power Input
Second Harmonic 100 Hz: < 1.0%
Second Harmonic 1,000 Hz: < 1.0%
Third Harmonic 100 Hz: < 1.0%
Third Harmonic 1,000 Hz: < 1.0%
Transducer Complement
High Frequency:
Vented Midrange
Low Frequency: 1 - EVM-15L
Box Tuning Frequency
44 Hz
Crossover Frequency
600 Hz
Impedance
Nominal: 8 ohms
Minimum: 5.3 ohms
Input Connections:
Parallel 1/4 inch phone jacks
(allows paralleling of multiple speakers)
Enclosure Materials and Colors:
Black carpet covered Road-Wood
Dimensions
Height: 72.9 cm (28.7")
Width: 61.9 cm (24.4")
Depth: 35.1 cm (13.8")
Net Weight
45 kg (99 lbs)
- Ad Type: Offering
- For Sale By: Owner
buy and sell | musical instruments | Guitars
2023-06-30