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New Sony Speaker design


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Saw this at JB and thought the idea was pretty silly.

 

Wouldn’t putting a floating tweeter right in front of the bigger speaker do something bad with the sound?

 

 

BED27AA2-7066-44A2-ADA3-BC0A8399BEBF.jpeg

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If the sound isn't good in the first place, it's pretty hard to make it sound bad.

 

Mass consumer goods for the unknowing who's only concern is to party loud and maximise distortion so as to annoy the neighbours even more. 

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1 hour ago, Mike13 said:

Wouldn’t putting a floating tweeter right in front of the bigger speaker do something bad with the sound?

Not as much as you might think.

 

An obstacle needs to be ~1/4 wavelength before it has a significant effect on the sound passing around it.

 

So, let's say the crossover point was 1khz.    1/4wl is 8.5cm.... looks like the front tweeter is about that size, so ok.

 

 

Putting the tweeter somewhere further away from the bigger woofer, also comes with problems..... it is advantageous to make the tweeter and the woofer as close as possible together.

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As well as the fact that some designers passively modify the response of the driver by having something in front of the driver where they believe the passive approach is a better bitter pill to swallow response tailoring in the crossover.

 

Lewis Muratori as an example had in one of his designed a large piece of felt placed in front of his main driver cone to tailor its response.  Duntech with the first version of the PCL15 used felt on the main dynaudio cone to change its characteristics etc.

 

Depending on the shape of the sony tweeter housing in front of the main driver it may be partially horn loading the main driver.

 

Or it may just be they decided to put a tweeter in front of the main driver because its a affordable mass market boom box and sound wasn't too much of a consideration?

 

LPG

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Not as much as you might think.

 

An obstacle needs to be ~1/4 wavelength before it has a significant effect on the sound passing around it.

 

So, let's say the crossover point was 1khz.    1/4wl is 8.5cm.... looks like the front tweeter is about that size, so ok.

 

 

Putting the tweeter somewhere further away from the bigger woofer, also comes with problems..... it is advantageous to make the tweeter and the woofer as close as possible together.

@nzlowie ^^^^

 

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9 hours ago, Lansche plasma guy said:

Duntech with the first version of the PCL15 used felt on the main dynaudio cone to change its characteristics etc.

Something 'stuck to the cone' like on the PCL15, is different to an object in front of the cone that the waves have to flow around.

 

9 hours ago, Lansche plasma guy said:

Or it may just be they decided to put a tweeter in front of the main driver because its a affordable mass market boom box and sound wasn't too much of a consideration?

One of the primary considerations would have been size/shape of the speaker - ie. how to make it more compact.

 

... another concern would be that having the cone tweeter to the side of, or above/below the woofer would carry the risk of the listener sitting in a null and getting terrible sound.. .. Coaxial drivers are a common solution for this.    It's not as much of an issue when the speaker is setup in a 'stereo triangle' with the tweeter at ear height .... but people don't often listen to this type ('boom-box') of speaker like that.

 

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10 hours ago, Black Orange said:

These guys do it. 

http://www.cabasse.com/en/cabasse_product/la-sphere/

 

 

The drivers are placed in front of 21 inch woofer. 

 

I heard the speakers a few years ago and loved the sound. Expensive at around 300K for the active version. 

la_sphere_tca_cabasse_cabasse.png

That’s one expensive webcam!

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  • 2 weeks later...
On ‎15‎/‎07‎/‎2018 at 9:40 PM, davewantsmoore said:

An obstacle needs to be ~1/4 wavelength before it has a significant effect on the sound passing around it.

 

So, let's say the crossover point was 1khz.    1/4wl is 8.5cm.... looks like the front tweeter is about that size, so ok.

 

You are not considering IMD (with the tweeter getting battered by the woofer's output)?

 

On ‎15‎/‎07‎/‎2018 at 9:40 PM, davewantsmoore said:

Putting the tweeter somewhere further away from the bigger woofer, also comes with problems..... it is advantageous to make the tweeter and the woofer as close as possible together.

 

As close as possible in the vertical plane (for lobing), as well as the horizontal plane (for time-alignment).

 

Andy

 

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1 hour ago, andyr said:

You are not considering IMD (with the tweeter getting battered by the woofer's output)?

No.  If the waves are much larger than the tweeter, that go past it like it isn't there... it doesn't wrap around so far that it travelling towards the tweeter cone/dome.

1 hour ago, andyr said:

As close as possible in the vertical plane (for lobing), as well as the horizontal plane (for time-alignment).

You may already understand .....  but I think This ^^^ will confuse people.

 

Any physical separation (irrelevant of direction) always causes lack of time alignment (at some point in space).   It is the lack of time alignment, which causes peaks/dips in the response (aka. lobing).

 

The separation direction, determines where the peak/dips are aimed..... this is why 'lobing' is often talked about in the vertical plane, because the separation between the drivers is vertical  (ie. drivers stacked in a vertical line, like many speakers).

 

 

 

A better way to convey it might be:

Quote

As close as possible in the vertical plane and horizontal plane (for time-alignment and lobing).

Noting that time-alignment and lobing are just views of the same thing for the accoustic response.... one is the cause, and one is the result.

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