Panda MK1 Measurements (My 1st DIY Project)

[Jason K]

I've finally measured my first speaker I've been building for several months this year.

This is the designing image by Sketchup.

I like Amphion's design, So I mixed it with the style of Mesanovic RTM10 (side sub)

Decent woodwork.

High gloss painting.

It was supposed to be a matt white, but conversation wasn't enough to understand each other.

Well, now I like it!

It's the first picture after assembled.

the tweeter and WG were Seas H1825, Visaton WG148R.
now they are changed with Bliesma T25B and custom WG.
the two midrange are SB15CAC30, the sub is popular Seas L26ROY.

This is now!



the picture was while measuring.

And finally here are the measurements!

(the point of rotation was about half of the depth of the speaker, cause my turntable wasn't big enough. So the data may looks it has a bit more narrow dispersion.)

I'm not good at Vituix CAD So I didn't make the polar response image.
If someone can, I can give the directivity measurements.




BTW,
Now I'm very satisfied for my speaker.
Several times tuning and measuring and making 3D printing WG were so hard but very fun and learned a lot of things.
the custom WG couldn't be perfect even I make 6 different versions. If I should make the WG again someday, I must buy the 3D Printer.

Next I'm gonna build 2 way design bookshelf speaker. It may looks like ASR Directiva.

Anyway,

Have a merry Christmas.
Thanks!

 

[thewas]

Excellent craftmanship, design and horizontal radiation, also clever choice making it 3.5 ways. Guess active crossover with 24dB/octave slopes?

 

[abdo123]

Incredible design! I'm guessing the slot in the back is for a hypex plate amplifier?

Great job on getting a 35Hz BW 12db/oct behavior, this ensures a flat in-room response down to DC (0 Hz) thanks to room gain.

Trully incredible. Would love to see what you can do with a coaxial though, screw traditional 2-ways they've been designed to death.

 

[Biblob]

Great design, love the craftmanship behind it.
How did you do the crossovers? Is it active? If yes, I'm curious to what equipment you use.

 

[Jason K]

Excellent craftmanship, design and horizontal radiation, also clever choice making it 3.5 ways. Guess active crossover with 24dB/octave slopes?

Yes. I set the crossover 150,300(0.5way/1st order),2000Hz with 24dB slope.
If I was able to use FIR filter, I will set 48dB slope. But I concerned about phase delay with IIR 8th order filter.

 

[Vict0r]

Absolutely next level DIY. They look fantastic!

 

[Jason K]

Incredible design! I'm guessing the slot in the back is for a hypex plate amplifier?

Great job on getting a 35Hz BW 12db/oct behavior, this ensures a flat in-room response down to DC (0 Hz) thanks to room gain.

Trully incredible. Would love to see what you can do with a coaxial though, screw traditional 2-ways they've been designed to death.

Yeah. The slot in the back is for the Hypex FA253 plate amp. I designed crossover by DSP.

-3dB / 35Hz, -10dB / 20Hz.
Most of rooms, 10dB room gain will occur easily.
So I choose that point.

Oh the drivers of 2-way speaker are already chosen. They are Seas DXT tweeter and 6 inch exel magnasume midwoofer.

It’s like traditional 2 way design, but I’m gonna make them simple and great!

 

[Jason K]

Great design, love the craftmanship behind it.
How did you do the crossovers? Is it active? If yes, I'm curious to what equipment you use.

I used Hypex FA series plate amp.
DSP crossover design.
Thanks!

 

[abdo123]

Yeah. The slot in the back is for the Hypex FA253 plate amp. I designed crossover by DSP.

Where is the 4th channel of amplification coming from?

 

[Jason K]

Absolutely next level DIY. They look fantastic!

After printing the two of WG with SLA printer, It will be finally done and start to listen.
I can’t wait no more..

 

[Jason K]

Where is the 4th channel of amplification coming from?

I added a simple passive crossover on the top mid(1st order LPF). top and bottom mids are connected by same channel.

 

[Jason K]

Edit:

A friend of mine help me calculate Spinorama with VituixCAD2.
I mistook to calculate the responses.
Now I understand why the SP DI(miscalculated) was lower than I expected.
Adding, Polar maps are here.
If I used elliptical waveguide, the vertical response would be more constant.

 

[squitti]

Hi Jason, I just saw these speakers “reviewed” on Jay’s iyagi YT channel, published just 22 hours ago, and started a search for them. Your post here is the only result I’ve found. Can you tell us more about these and how we may go about building them ourselves?

 

[Dougey_Jones]

What line of work are you in that you have access to all of these tools and testing equipment? Unbelievable job by the way, I feel like your DIY is more advanced than a lot of commercial speaker producers.

 

[kemmler3D]

To me this is basically the DIY job I'd like to be able to do. Plan to use Bliesma and FA amps, although probably with different mid and sub. (purifi?) Results look awesome. Any tips for someone who hasn't yet tackled a DIY speaker?

 

[fineMen]

Excellent!