Small 2-way speakers with linear on-axis and power response characteristics (Scan Speak and SB Acoustics drivers). H&V off-axis measurements included

[Abbe]

Hello!

I just wanted to say a big thank you to @XMechanik for this design. It finally gave me the confidence to take the step into diy audio.

I kept the build simple using 18mm MDF and finished it with vinyl wrap.Unfortunately, I don't have a microphone for acoustic measurements yet, but I have managed to measure the impedance (thanks to @wineds for the guide).

Would anyone be willing to take a look at my graphs and see if everything looks correct?

 

[wineds]

Your impedance plot looks fine. Nice build. Your speakers look great.

 

[XMechanik]

Hello!

I just wanted to say a big thank you to @XMechanik for this design. It finally gave me the confidence to take the step into diy audio.

I kept the build simple using 18mm MDF and finished it with vinyl wrap.Unfortunately, I don't have a microphone for acoustic measurements yet, but I have managed to measure the impedance (thanks to @wineds for the guide).

Would anyone be willing to take a look at my graphs and see if everything looks correct?

View attachment 511645View attachment 511646View attachment 511647

I'm a bit embarrassed to see all these implementations which look so professional and neat comparing to my humble prototype. I should consider adding an index of implementations to allow one click easy access (rather than paging through this lengthy thread).

 

[XMechanik]

Index created, see the leading post link. I've tried to list all finished builds from this thread. Please let me know if I've missed anything or if something should be added (or changed) in the remarks.

 

[BossBunos]

Hello!

I just wanted to say a big thank you to @XMechanik for this design. It finally gave me the confidence to take the step into diy audio.

I kept the build simple using 18mm MDF and finished it with vinyl wrap.Unfortunately, I don't have a microphone for acoustic measurements yet, but I have managed to measure the impedance (thanks to @wineds for the guide).

Would anyone be willing to take a look at my graphs and see if everything looks correct?

View attachment 511645View attachment 511646View attachment 511647

The wrap looks very well done. I think you wrapped the front, sides and rear in 1 piece and then the top and bottom separate? I can't see the seam on the top panel

 

[Abbe]

The wrap looks very well done. I think you wrapped the front sides and rear in 1 piece and then the top end bottom separate? I can't see the seam on the top panel

Thank you! Yes, that's exactly how I did it. I also sanded it carefully with 2000 grit paper, just enough to 'melt' the seams together.

 

[klapper]

I'm hammering out some process issues but my mold for this baffle, with integrated wave guide, is producing some results.

I Just saw your version thanks to the new list from XMechanik (Thank you for your work). Do you have any CAD file or measurements for the front esp. the waveguide ? I am planning on making a second pair similar to yours but using again a 3D printed front.

 

[NopeNope2]

Low distortion filter upgrade.

After a few days of listening I’m really happy with this upgrade. Any reduction of distortion in the midrange is a must have for me.

I’ve put all the relevant files here in case someone else wants to try it :

Mechano23-xover/Low_THD_Filter at main · wineds/Mechano23-xover

Mechano23 xover. Contribute to wineds/Mechano23-xover development by creating an account on GitHub.

github.com

Manufacturing file Low_THD_Filter_Gerbers.rar needs to be uploaded to the PCB vendors site as per the crossover PCB.
The filter needs to be placed in series with the woofer (either positive or negative terminal).

PCB lugs are the same as crossover PCB. There is a minimal BOM low_THD_BOM.xls that provides a number of options for the inductor. The Solen and Jantzen inductors were not ex stock in my region so I bought the 0.13mH Dayton ones and did this ugly hack :

If you use the Dayton 0.13mH inductor remove the cable tie furthest from the termination point and carefully start removing outer windings until only 4 remain. This will result in a 0.11mH inductor. Complete by adding a few new cable ties to aid mechanical stability. I also applied some "liquid nails" to help keep the windings in place. viz:

View attachment 495460

View attachment 495461

The 47ohm 5W resistor I used is overkill. A 0.25 or 0.5W metal film resistor can be used instead or omitted if you wish.

I tried uploading the rar to the site. Both the thd filter and the revA don't fill out these options. Whats the correct ones for these?

 

[wineds]

Not sure I understand what's missing? The dimensions? Is that pcbway? I have only tested with jlcpcb.

Dimensions are : 78.7mm * 63.5mm

 

[Abbe]

I tried uploading the rar to the site. Both the thd filter and the revA don't fill out these options. Whats the correct ones for these?

Are you logged in ?

 

[StephenMarkLay]

Is the woofer available in the states?

 

[a4eaudio]

Is the woofer available in the states?

Yes.

High-End Loudspeaker Parts | DIY Speaker Components | Madisound

SB Acoustics SB13PFCR25-04 5" Composite Paper Cone Woofer- ROUND- 150mm- 4 ohm

www.madisoundspeakerstore.com

 

[StephenMarkLay]

Yes.

High-End Loudspeaker Parts | DIY Speaker Components | Madisound

SB Acoustics SB13PFCR25-04 5" Composite Paper Cone Woofer- ROUND- 150mm- 4 ohm

www.madisoundspeakerstore.com

Thank you so much. I checked a week or two ago and they weren’t listed that I could find. Maybe they were just out of stock

 

[a4eaudio]

Thank you so much. I checked a week or two ago and they weren’t listed that I could find. Maybe they were just out of stock

For some reason the COAX comes up by default. The 5", 4-ohm woofer didn't come up in my Google search when I went to get you the link, but I happen to know they carry it so had to look harder.

 

[StephenMarkLay]

For some reason the COAX comes up by default. The 5", 4-ohm woofer didn't come up in my Google search when I went to get you the link, but I happen to know they carry it so had to look harder.

Thank for finding them. I am ordering them tonight.

 

[NopeNope2]

Not sure I understand what's missing? The dimensions? Is that pcbway? I have only tested with jlcpcb.

Dimensions are : 78.7mm * 63.5mm

It's on jlcpcb. I haven't ordered pcbs before. Do the layers and base material matter?
What's the dimensions for the thd filter too? Or are they the same size?

 

[StephenMarkLay]

Meanwhile in Poland. In the town of Brwinów.

I love this and might try it.

 

[NopeNope2]

Are you logged in ?

Oh, that solved it. Thanks!

 

[NopeNope2]

Not sure I understand what's missing? The dimensions? Is that pcbway? I have only tested with jlcpcb.

Dimensions are : 78.7mm * 63.5mm

Alright. I literally have no clue what I'm doing here. From what I read. I don't need pcb assembly from them. I just need the board and the stencil? Or do I only need the board?

 

[wineds]

Alright. I literally have no clue what I'm doing here. From what I read. I don't need pcb assembly from them. I just need the board and the stencil? Or do I only need the board?

You only need the board