There's also a very comprehensive Mechano thread over at audiosciencereview. They've created crossover pcbs, etc.
https://www.audiosciencereview.com/...ers-h-v-off-axis-measurements-included.41757/
https://www.audiosciencereview.com/...ers-h-v-off-axis-measurements-included.41757/
Another episode from the "Mechano" series: a small 3-way design (7l) with drivers arranged for use "lying on side". Codename Mechano325.
The drivers:
DSA135-8 link
PC83-4 link
ND28F-6 link
Filter schematics and and charts:
THD -47dB or 0.5% (at 86dB)
Assembled crossover (3 filters):
Box dimensions: 290x174x263mm.
Only the tweeter is flush-mounted.
Midrange driver chamber
Total components cost was about 280EUR/pair (enclosures not included)
The drivers:
DSA135-8 link
PC83-4 link
ND28F-6 link
Filter schematics and and charts:
THD -47dB or 0.5% (at 86dB)
Assembled crossover (3 filters):
Box dimensions: 290x174x263mm.
Only the tweeter is flush-mounted.
Midrange driver chamber
Total components cost was about 280EUR/pair (enclosures not included)
This could make the other budget 3-way thread redundant! Any chance of attaching all the xmachina project files?
@XMechanik What a fantastic little build! Thank you so much for your work in this world. Is this a sealed or vented design? I'm surprised to see an F6 of 40hz out of such a small driver.
It's a vented design with a slotted port on the back.
As for the low f6, this woofer has been optimized for application in small enclosures. Slightly reduced sensitivity also improves the final result in this aspect.
Wonderful, thank you. What was your tuning frequency of the vent in the enclosure to hit 40hz F6? @XMechanik
Here's NF chart of my tuning: c.a. 45Hz as I'm reading it. f6 is also an effect of 100Hz area correction in the crossover and adjusting the level of the rest of the characteristic to the level in this region.
Can anyone help me with purchasing the crossover components in the US?
A bit new to the DIY speaker scene. I literally for the life of me cannot find this air coil anywhere online:
Jantzen Audio core coil 0.68mH / cylindrical / 0.162ohm / dr.1mm Fe 0.021kg / dia.20, length 40mm.
I searched for these exact specs on soundimports.eu as well and was able to find:
Jantzen Audio 000-0113 | 0,68 mH | 0,155 Ω | 3% | 13 AWG | Air Core Coil
Wondering if this is the correct one? But the impedance doesn't match exactly. Any help is greatly appreciated! Am looking to put together a pair of the mechano22's using a 3d printed housing (Have to modify @celstark's design on ASR: https://audiosciencereview.com/foru...axis-measurements-included.41757/post-2247946 for the dayton drivers)
A bit new to the DIY speaker scene. I literally for the life of me cannot find this air coil anywhere online:
Jantzen Audio core coil 0.68mH / cylindrical / 0.162ohm / dr.1mm Fe 0.021kg / dia.20, length 40mm.
I searched for these exact specs on soundimports.eu as well and was able to find:
Jantzen Audio 000-0113 | 0,68 mH | 0,155 Ω | 3% | 13 AWG | Air Core Coil
Wondering if this is the correct one? But the impedance doesn't match exactly. Any help is greatly appreciated! Am looking to put together a pair of the mechano22's using a 3d printed housing (Have to modify @celstark's design on ASR: https://audiosciencereview.com/foru...axis-measurements-included.41757/post-2247946 for the dayton drivers)
Normally you would use any appropriate 0m68H coil. Either one that has been made with crossover use in mind, or anything which has similar properties.
The use of an iron core is optional, but it helps to reduce resistance (which is of interest for matching to the original design). Some cores might not be appropriate for higher frequency use.
As for the resistance, the 0.162 vs 0.155 ohm is close enough. You might get away with a bigger difference, but at some point you'd want to view those differences in the simulator to decide whether their effect would be noticeable.
The use of an iron core is optional, but it helps to reduce resistance (which is of interest for matching to the original design). Some cores might not be appropriate for higher frequency use.
As for the resistance, the 0.162 vs 0.155 ohm is close enough. You might get away with a bigger difference, but at some point you'd want to view those differences in the simulator to decide whether their effect would be noticeable.
Thanks Allen. Looks like I’ll download and learn that program to play with his crossovers with parts I can buy. Much appreciated.
I have put together a list of components for these speakers in the US, comes to about 230$ - This seems restrictively expensive for a budget speaker, so will have to shelf this idea for now.
Speaker Crossover Parts List
Inductors
| Component | Quantity | Unit Price | Total Price |
|---|---|---|---|
| 3.7 mH Steel Laminate Inductor 18 AWG | 2 | $14.20 | $28.40 |
| Solen 0.82 mH Perfect Lay Inductors 14 AWG | 2 | $27.30 | $54.60 |
| Solen 0.68 mH Perfect Lay Inductors 14 AWG | 2 | $24.60 | $49.20 |
| Madisound 0.12 mH 19 AWG Air Core Inductor | 2 | $5.40 | $10.80 |
Capacitors
| Component | Quantity | Unit Price | Total Price |
|---|---|---|---|
| Solen 11uF 400V Polypropylene Capacitor (Part #027-571) | 2 | $10.30 | $20.60 |
| Solen 9.1uF 400V Polypropylene Capacitor (Part #027-566) | 2 | $7.78 | $15.56 |
| Dayton Audio DMPC-8.2 8.2uF 250V Polypropylene Capacitor (Part #027-426) | 2 | $4.08 | $9.16 |
| Dayton Audio DMPC-4.3 4.3uF 250V Polypropylene Capacitor (Part #027-419) | 2 | $2.15 | $4.30 |
| Dayton Audio DMPC-3.3 3.3uF 250V Polypropylene Capacitor (Part #027-420) | 2 | $1.19 | $2.38 |
| Solen 0.47 mfd Fast Cap 630V PPE Series | 2 | $4.40 | $8.80 |
Resistors
| Component | Quantity | Unit Price | Total Price |
|---|---|---|---|
| Jantzen Audio 0.18 Ohm 10 Watt Audio-Grade Superes Resistor (Part #255-937) | 2 | $6.75 | $13.50 |
| Dayton Audio DPR10-4.7 4.7 Ohm 10 Watt Precision 1% Audio Grade Resistor (Part #006-4.7) | 2 | $2.15 | $4.30 |
| Dayton Audio DPR10-2.4 2.4 Ohm 10 Watt Precision 1% Audio Grade Resistor (Part #006-2.4) | 2 | $2.15 | $4.30 |
| Madisound 12 Ohm, 25 Watt Wirewound Resistor | 2 | $1.20 | $2.40 |
| Madisound 10 Ohm, 25 Watt Wirewound Resistor | 2 | $1.20 | $2.40 |
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For the 3,7mH that one is ok. Wrt the other inductors: find those that set you back around $10/pair. Capacitors can be found cheaper elsewhere too I'd say, apart from professional distributors. And just use cheap low inductance wirewound resistors. People claiming that they can hear the difference sure will have a hard time proving such statements.
To help out a bit: 0,68mH-ish is just fine, like 0,82mH-ish.
To help out a bit: 0,68mH-ish is just fine, like 0,82mH-ish.
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I was keen on this design to retrofit an existing cabinet, however the internal volume is only 6L. Such cab likely needs a smaller woofer from what seems to sim, and what's in there already isn't tuned for extension so much. Plus has a huge "shielded" magnet sucking up valuable space. It's OK but the cabs are nice enough for more imo.
Note that the 3.7mH coil in the original crossover has 3.25 ohm resistance and this is intentional. Using a lower ESR coil makes some flaws in the characteristics (plus the coil is larger, heavier and probably more expensive).
You can of course use a low ESR coil if there is no other option, just add a 2.4 or 2.7ohm resistor in series.
Yep, I planned on adding extra resistors to it to up the ohms rating to spec, not sure if that would affect performance. I verified all my components found match your spec in the application (for creating crossovers, blanking on name). Any chance a similar spec can be made with cheaper components? (I see now that is your suggestion). I want to play with your program but haven’t found time yet to dive in. I have been using LLM to guide me through alternative options to lower the cost and using resistors on certain inductors ( as you saw above) was one of those methods. Any suggestions welcome.
Mechano22. As mentioned I couldn’t find a few of his specified air coils so some extra resistors are included in the parts list to bump up the ohms on a few replacement air coils.