Improvement the speaker with flat sandwich cone

[Svjatoslav]

Available, for a simple measurement of the speakers, look here:
How to Measure Speaker Impedance (with Pictures) - wikiHow

 

[legopart]

Thanks, but I searching method to measure the response graph with USB microphone like Umik1

can you tell me how to do it ?,
what the distance keep from the driver?

 

[kach22i]

Cool beans.

Reminds me of a Balanced-Mode Radiator (BMR).

Example:
Tectonic TEBM65C20F-8 3-1/2" BMR Full-Range Speaker 8 Ohm

Product Details

Tectonic TEBM65C20F-8 3-1/2" BMR Full-Range Speaker 8 Ohm
Tectonic TEBM65C20F-8 Balanced-Mode Radiator (BMR) features extended frequency response and wide dispersion compared to that of a conventional drive unit. It combines the benefits of Tectonic Elements bending-wave technology and pistonic modes of operation. It is ideally suited for compact audio applications that require a full-range, high performance acoustic solution such as a soundbar. An advanced ferrite-based motor is combined with special cone dampers to ensure a small size that outperforms conventional drivers, especially in off-axis performance.

What is BMR? | Cambridge Audio

Another benefit of BMR technology includes near-180 degree sound dispersion.

And these, Distributed Mode Loudspeaker Transducer.

Dayton Audio DML25-4 2" Distributed Mode Loudspeaker Transducer 20W 4 Ohm

..........Designed to behave like a conventional pistonic driver at lower frequencies and a DML (distributed mode loudspeaker) and higher frequencies............

...................Great off-axis directivity enables flexible placement options

 

[rdf]

For what I thought was just cynical marketing the Sony AMP-717 had a nice tweeter.

 

[Svjatoslav]

Thank you! Now the full picture.
I have repaired these several times.
And a photo of the structure.

 

[kach22i]

This loudspeaker by Technics might be in the same technological family.

What do you think?

Speaker System SB-C700 | Premium Class C700 Series | Technics US

The flat coaxial two-way speaker drive unit is an original Technics development, designed for the faithful reproduction of mid-range and high-frequency sound. The flat woofer diaphragm has a sandwich-structure using lightweight, high-rigidity carbon fibre skins and a honeycomb core, and is designed for a highly accurate pistonic motion over a frequency range extending beyond the crossover frequency with the tweeter, thus ensuring smooth integration.
The flat design eliminates the frequency anomalies due to the cavity effect caused by conventional cone diaphragms, while the magnetic circuit employs a large magnet, copper cap and shorting ring, and a short voice coil with concentrated edgewise winding for high power with low distortion. The drive unit chassis is in highly rigid die-cast aluminium, with the chassis ‘legs’ having a resonance dispersing structure to eliminate even the smallest unwanted vibration, to help the drive unit deliver accurate and powerful bass.......

 

[Svjatoslav]

I'm trying an intermediate option. The continued of the voice coil to the cap. It turns out an intermediate version of the rigid structure between the usual conical and honeycomb speakers.

 

[Boden]

Hello Svjatoslav,

Do make the spiders yourself? If so, would you care to explain the making of those?

 

[Svjatoslav]

Hello Boden,

I don't make spiders myself, I take them ready.​

The photo shows the upgrade process.​

 

[Boden]

And those cones and surrounds?

 

[Svjatoslav]

Taken from different columns. Relevant parts.
Photo of the next work.
The photo of the assembled moving parts shows traces of gluing the cap to the frame of the sound coil.
At the end of the assembly, the cone became solid in the radial direction.
It turns out that the extension of the voice coil is advantageous for ordinary speakers. Not just for flat "honeycombs".

 

[Boden]

Very nice. This is the kind of loudspeaker fiddling I also like.

May I ask: do yu have a specific trick to disassemble the magnet and polepieces? Looks like solid cast glosniki frames..

 

[Svjatoslav]

We are under occupation. The city is blocked, no one from the family has a job. Products are running out, no supplies. The money will also run out soon.
There is no gas, as well as heating, and on the street at night minus 6, in the daytime zero.
It's good that the Internet is still working.
So the task is simply not to die of hunger and cold.
It's just genocide.

 

[C37]

OMG, Take care, stay safe! Praying for you...

 

[adason]

Terrible! I can't believe this is happening. How can we help? Besides praying.

 

[slofut]

This is so sad, I've been checking this thread since thursday hoping he would post back. Makes me sick to my stomach. My heart is with you Svjatoslav.

 

[alexberg]

Unicuique secundum opera sua

 

[Svjatoslav]

It was possible to take the family out of the occupation at the beginning of April. And now there is good news. The army chases the enemy, liberates the territories. So I can be here again. Friends, thank you for your support!
Even bought a couple of donor cellular loudspeakers for future work.
https://photos.app.goo.gl/WBCggRi3ZTfv5r1XA
https://photos.app.goo.gl/qvfLVrfXjkwf2G367

 

[Svjatoslav]

Дуже мило. Мені також подобається такий тип гри в динаміках.

Чи можу я запитати: чи є у вас спеціальний трюк, щоб розібрати магніт і полюсні наконечники? Виглядає як цільні литі рамки для глосників..

Domestic ferrite magnetic systems of loudspeakers are disassembled easily, purely mechanically. The glue is weak there. All others must be heated to 80-100 degrees Celsius.
Then a strong blade at an angle to the place of gluing. And a hammer blow. in most cases, the magnet is disassembled without damage.

 

[Boden]

I am flattered my Ukrainian is finally fluent in the quote above.

Glad to have you back Svjatoslav!