Hi all,
Putting together a feasibility to build the Helios tx project.
Can anyone enlighten me on the part specs for the crossovers, in particular the resistors? Wondering if they are 3k, 12k,5k,3.9k ?
Thanks, David
Putting together a feasibility to build the Helios tx project.
Can anyone enlighten me on the part specs for the crossovers, in particular the resistors? Wondering if they are 3k, 12k,5k,3.9k ?
Thanks, David
Last edited:
R1= 5 Ohm
R2 = 3 Ohm
R3 = 3,9 Ohm
R4 = 12 Ohm
Resistors are missing the Wattage ratings from the schematic, in general anything under 5 Watts resistors are not suited for the purpose of speaker XO's 10-20 W is probably more suitable for this application. Higher wattage means the resistors can dissipate more effect before they burn up, and generally they will heat up less and be bigger in size.
L1 = 3,01 milli Henries
L2 = 400 mikro Henries
L3 = 1,5 mH
Inductors are denoted with gauge and type, but the resistance will only be in the ballpark without values
C1 = 2,2 mikro Farad
C2 = 8,2 mikro Farad
C3 = 17 mikro Farad
The schematic is done with X-sim which is free crossover simulator software, to download fx :
https://xsim.software.informer.com/
Try and download it and make the circuit if you cna find the .FRD and .ZMA files for the drivers in question.
There are 100's of pages of threads on the software on here.
Most these days will look at using VituixCad instead of Xsim, as it is a more complete software package for a design.
For the resistors they are R1=5ohm, R2=3ohm, R3=3.9ohm, R4=12ohm. You should be looking at 10W rating for the tweeter and posibly 20W rating for the Woofer but you can simulate in Vituix and see what power is ping through each component.
If not just ask Javad Shadzi on the facebook DIY Loudpeaker Pad on Facebook.
If not just ask Javad Shadzi on the facebook DIY Loudpeaker Pad on Facebook.
I Very much appreciate the details from both of you , Arez and Ugg10. Also wondering if anyone here has built this project.
Thanks once again.
Thanks once again.
Unfortunately I don’t think I can download the programs to an iPad Or so I’ve been told.
L1 has a description of 3.01mh 16 gauge iron laminate. Does that mean iron core. Looking at the picture it doesn’t appear to be iron core
Yeah they will not run on the Apple OS's without running it in a Windows virtual machine.
It won't really make much difference. There's only 0.2 ohms DCR difference between the aircore and iron core. The iron core being the lower DCR (DC resistance). There are some that claim they can hear the difference between air and iron core. If given the option, aircore inductors are preferred unless very large inductance is required or lower impedance is needed to reduce losses. so Madisound using an aircore 14awg is perfectly fine.
PS: I wouldn't bother downloading XSim and trying to replicate the crossover, using some random FRD/ZMA data. There's no point. you wont' match reality for a number of reasons and you can't really improve on this design. If Javad had the successful Beryllium version as a benchmark, then it's likely optimised.
Thank you Dave for your explanation, it is very much appreciated. Question if I may. Have you built this project or have you listened to it?
Cheers David.
Cheers David.
No I haven't built it nor listened to it. However, I don't recall anyone saying anything bad about the Beryllium version and Jeff Bagby said it was the best 2 way he'd ever designed. He didn't seem to be the kind to brag either, just honest. The Textreme version is quite new.
See this post, and the discussion that follows...
https://www.diyaudio.com/community/threads/sb-acoustics-textreme.343831/post-7708334
https://www.diyaudio.com/community/threads/sb-acoustics-textreme.343831/post-7708334
Thanks Hifijim, interesting read. I have previously emailed Javad but no response.
To my eyes the waveguide looks very similar to the bnwg model.
There appears to be no timeframe on the release of the TXNWG
To my eyes the waveguide looks very similar to the bnwg model.
There appears to be no timeframe on the release of the TXNWG
There maybe no time framme on that wg sold separately. It does come with the kit from madisound.
Madisound writes: We just received word that the first production run of the TW29TXNWG-4 tweeter used in this design is scheduled, and we should have them in stock by the end of July.
Not sure if this is an official launch or if the first run is earmarked for Madisound and the Helios kit, but at least it is a start 🙂
For the Helios kit, of course it is important to use the TW29TXNWG-4 driver as specified.
For the rest of us, @augerpro has an excellent waveguide for the TW29TXN tweeter, so it is very nice to have multiple options.
For the rest of us, @augerpro has an excellent waveguide for the TW29TXN tweeter, so it is very nice to have multiple options.
