Stein Music

Bobby M Loudspeakers

€9,998

 

  • Module system: Combination of the Bobby S horn speakers with a bass extension
  • Horn can be customized in color
  • Housing colors black / white
  • Sound pressure 89 dB
  • Impedance 4 ohms
  • Crossover frequencies: 80 Hz, electrical 18 dB; 2400 Hz, electrical 6/12 dB
  • Together with the mechanical filters, this results in a very even phase and frequency range.
  • Frequency range 34 Hz - 24800 Hz
  • Dimensions: height 1015mm, width front 230mm, width rear 280mm, depth 290mm
  • Weight: 30Kg

The SteinMusic Bobby M and Bobby L, that means the Bobby S. with
Bass extensions.

The Bobby Bass Extension was specially developed to perfectly expand the possibilities of the Bobby S and Bobby S Signature monitor speakers to the size and performance of a floorstanding speaker.

The Bobby Bass Extension is a passive box with an integrated crossover that is optimally matched to the Bobby S loudspeakers.

It is just the right height to serve as a stand for the Bobby S.

There are two ways to use the Bobby Bass extensions:

Add a Bobby Bass Extension under the Bobby S and you get a Bobby M.

Place another Bobby Bass extension on top of the Bobby S and you have a Bobby L.

The SteinMusic Bobby S speakers

The basic idea was to build a coherent and relaxed sounding loudspeaker with an excellent impulse response.

We have chosen horns for the high frequencies because they allow the membrane movement to be perfectly adapted to the air.

Compared to a normal loudspeaker which has to move all the air in the room directly, we achieve a significant increase in the level of fine information here.

It is not our aim to increase the efficiency by using compression drivers.

For our taste, this often leads to a somewhat thin and hard sound.

Many years of development have been invested in the perfect coordination between horns and chassis in order to achieve maximum sound finesse.

For us, an excellent frequency response, a linear phase and perfect transient response are essential principles for a good-sounding loudspeaker.

Technical data with one SteinMusic HighLine Bobby Bass Extension per side, which results in a Bobby M.

Sound pressure 89 dB

Impedance 4 ohms

Crossover frequencies: 80 Hz, electrical 18 dB; 2400 Hz, electrical 6/12 dB

Together with the mechanical filters, this results in a very even phase and frequency range.

Frequency range 34 Hz - 24800 Hz

Dimensions: height 1015mm, width front 230mm, width rear 280mm, depth 290mm
Weight: 30Kg

Technical data with two SteinMusic HighLine Bobby Bass Extensions per side. This gives you a Bobby L.

All technical data remain unchanged when another Bobby S Bass Extension is stacked on top of the Bobby M, with the exception of the impedance which changes to 8 ohms.

However, the radiation resistance improves significantly, which leads to an even more realistic representation of the music.

Dimensions: height 1635mm, width front 230mm, width rear 280mm, depth 290mm
Weight: 47 kg

Driver

The bass speakers are all 6 "speakers with a carbon-coated natural fiber membrane and extremely low mechanical losses.

We use a horn-loaded silk dome tweeter as the tweeter, which is also coated with carbon.

The membranes of the bass and the tweeter are also treated with SteinMusic Maestro varnish.

This treatment gives both of them a very natural sound signature that is the same over the entire range of frequencies that the Bobby loudspeakers can reproduce.

We source these chassis from one of the best manufacturers and modify and optimize them in many ways in order to reduce mechanical losses and to obtain an open sound with many details and without discoloration.

The bass speakers in detail:

  • Vented cast aluminum chassis for optimum strength and low compression
  • Proprietary cone material with natural fibers
  • Soft low damping rubber surround for transient response
  • Non-conducting fiber glass voice coil former for minimum damping
  • Extended copper sleeve on pole piece for low inductance and low distortion
  • CCAW voice coil for reduced moving mass
  • Long life silver lead wires
  • Vented pole piece for reduced compression

The tweeter in detail:

  • Copper cap for reduced voice coil inductance and minimum phase shift
  • Non-reflective rear chamber with optimized damping for improved dynamics
  • Flow optimized vented pole piece for optimum coupling to rear chamber
  • Fine weave soft fabric dome for smooth frequency response
  • Saturation controlled motor system for low distortion
  • CCAW voice coil for low moving mass
  • Long life silver lead wires
  • Low resonance frequency

Wiring

The internal wiring is made of the finest solid core copper conductors

The diameter for the bass is 1mm, for the tweeter we use exactly the same style of conductors but decreased the diameter to 0,5mm.

The result is a better resolution of the higher frequencies, maintaining a coherent overall reproduction.

Crossover

Before designing a crossover we have carefully matched and adjusted the drivers so that we may get best results with a simple configuration here, which ensures no detail of the music will get lost in this part of the speaker.


Components

Each component of the crossover is of the best quality and was chosen after extensive listening tests.

The most critical capacitor for the tweeter is an oil-impregnated film capacitor.

We have opted for our favourite Mundorf capacitor in terms of sound.

We receive these as raw windings and process them in our company according to our ideas and experience to a capacitor with a unique, fine, expressive sound without discolouration.

The coil in the bass range consists of individually insulated strands, and we use only our preferred Beyschlag film resistors as resistors.

In addition to the classic components used in a crossover, we also use our proprietary InLine Matrix components to avoid magnetic distortions.

Cabinet Bobby S

The housing is a vented box with short tubes in the front behind the high range horn.

It is wider in the back than in the front in an exactly defined ratio that we empirically found out to be the best solution here.

One important aspect of this construction is that we will not have standing waves between the side walls.

Another is that in combination with the 40mm thick back wall it gives the housings an enormous stability against unwanted housing resonances.

This allows us to work completely without any internal dampening material, which does not only absorb unwanted resonances but also always sucks out energy from the music.

The Bobby S are equipped with solid walnut feet for a transparent but organic sound.

Cabinet Bobby Bass Extension

The housing is a vented box. The bass reflex tunnels are located close to the bottom, and we have chosen a contour that changes its diameter slowly over the length. Be this we get a much better contour of the bass.

The housing is wider in the back than in the front in an exactly defined ratio that we empirically found out to be the best solution here.

One important aspect of this construction is that we will not have standing waves between the sidewalls, which in addition are stiffened with a bar.

This gives the housings an enormous stability against unwanted housing resonances.

This allows us to work completely without any internal dampening material, which does not only absorb unwanted resonances but also always sucks out energy from the music.

Terminals

Two pairs of speaker terminals at the Bobby S speakers allow the use in bi-wiring or bi-amping.

The choice of speaker terminals was a result of long listening tests of different models.

We finally decided for a sturdy version that allows the use of banana plugs or spades.

There are two toggle switches on the connection panel of the Bobby S, with which the character and volume of the high frequencies can be adjusted according to the positioning and characteristics of the listening room and personal preferences.
With the Bobby Bass extensions, no additional switches are required.
Depending on the positioning and characteristics of the listening room and personal preferences, you can use the supplied acoustic foam parts in one or both bass reflex channels for adjustment.

Specials

All drivers, crossover components, terminals and cables are processed with a special in house developed technology reduce material stress, and so increase the conductivity for complex signals.

We also use our unique quantum physical approach, which you can also find in our E-Pads.

Also we use the SteinMusic InLine Silver devices in the crossover to avoid magnetic distortions.

Review Bobby M

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