Still thinking about ways to improve Manifold.
@Brian Steele already shown that ODTL is an evolution compared to a Standard Vented Box, so how about replace the vented part from Manifold with a ODTL or a MLTL as the sketches below?
Unfortunately, currently we can't simulate then using Hornresp, maybe someone that knows akabak could give a try ad check if there is any potential. If the benefit is confirmed, maybe David could implement more CH options. This one requires Offiset drive also in the back path.
@Brian Steele already shown that ODTL is an evolution compared to a Standard Vented Box, so how about replace the vented part from Manifold with a ODTL or a MLTL as the sketches below?
Unfortunately, currently we can't simulate then using Hornresp, maybe someone that knows akabak could give a try ad check if there is any potential. If the benefit is confirmed, maybe David could implement more CH options. This one requires Offiset drive also in the back path.
Attachments
Hey @weltersys
Do you know how to use akabak and what is your opinion about the changes mentions in the post #21 could them bring any improvement or the overall results might be more or less the same?
Regards,
Do you know how to use akabak and what is your opinion about the changes mentions in the post #21 could them bring any improvement or the overall results might be more or less the same?
Regards,
Your manifolds are similar to the Devastators that Redfive designs on avsforum.com. He uses the OD function in HR for his BP6P's. You can slide the driver up and down the horn path with the OD function while maintaining the mounting position of the driver. The CH function is good for when the driver stays in the center of the enclosure. TH's are BP6S. BP's RULE!!!!!!
True, thanks for reminds me, the attachment #1 we could model using BP6P, the others two don't, but it's already an advantage.
I'm big fun o BP6P too and many devastators were already incorporated in the website list. The BP6P6 is the Manifold-MTB with constant cross section area 🙂
BP6P1
BP6P2
BP6P3
BP6P4
BP6P5
BP6P6
BP6P7
BP6P8
BP6P9
I don't know how to use akabak, and struggle with Hornresp...
I agree the OD/rear chamber and Helmholtz resonator system model like Redfive uses seems most like the horn and port designs considered in this thread.
https://www.avsforum.com/threads/devastator-hornresp-tutorial.3118466/#post-59146952
What does the "TC" in your Manifold-MTB model represent?
Art
This system models is defined from Hornresp. Sometimes I modify them to propose a new model to David.
Tc = Throat chamber
Ta = Throat adapter
CH1 and OD works more or less the same, the hard part part is how to model the transmission line, the back part of the driver. The front part remains the same. Currently we can't model those proposals using hornresp.
I was playing with SpicyTL2.0 and tried to model the double 18" manifolded. The cabinet is quite brainy and this is only a first approximation, but the simulation results look very interesting.
Tack on an acoustic band-stop filter and let those interested in such manifold designs figure out how best to implement?
chasing that driver entry position with these generic models that assume a common exit (faking it to explore)
Nice, can SpicyTL2.0 calculate the Manifold version with a Transmission line in the back? I mean currently the back side of the driver feed into a rear chamber with vent and I would like to replace the rear chamber with a transmission like as suggested in the post #21
Certainly it can, version 2.0 has achieved an exceptional level of modularity. The whole project (double 18" manifolded) was modelled with TL segments.
Ciao Andrea
Currently all model I'm sharing are integrated with hornresp, is there a way to integrate them to Spicy2.0?
Basically I'm using CAD with some programming code in Pyton as Macro in order to export *.txt file with data in witch Hornresp can import.
Saluti
LTspice generates a netlist which contains all parameters and from which it would be possible to reconstruct the entire circuit, so technically it would be possible. However, I think it would be a tremendously more complicated matter than what you are doing now. Moreover, the modular construction in SpicyTL2.0 is so simple and intuitive that any integration may be unnecessary.
I think what Lord means is to create the 3D renderings in FreeCad from the data exported from SpicyTL2.0
For those that want to give a try, 4 Manifolds options were added in the website:
- Manifold-1-Dual
- Manifold-2
- Manifold-2-Dual
- Manifold-3-Dual
Attachments
I take a look at your website, you really made an excellent work 👍
Hello,
Once David sometime ago the new model CH3, it was possible to evaluate different back "chambers" for Manifold as indicated in this thread. Attached you can find the PDF with all the simulations, two pictures with the best model found and zip file with all input data.
The X5b shown very interesting results and for its simplicity to build it looks promising.
Have a good day.
Once David sometime ago the new model CH3, it was possible to evaluate different back "chambers" for Manifold as indicated in this thread. Attached you can find the PDF with all the simulations, two pictures with the best model found and zip file with all input data.
The X5b shown very interesting results and for its simplicity to build it looks promising.
Have a good day.
Attachments
Any one using different offset stubs in the two different (front and rear) chambers to create ‘Helmholtz’ chambers to cancel out 1/4 wave resonances?