Wayne's 4pi might be of interest, note that he also uses the DE250:
https://www.pispeakers.com/catalog/product_info.php/products_id/105
I don't really like the WG that he uses but the standard JBL or XT could be used:
https://www.lencoheaven.net/forum/index.php?topic=30087.0
https://www.lencoheaven.net/forum/i...ick896ucnfm46&topic=30087.msg391702#msg391702
JBL 2226H are about $500 each, ouch!
See the PI H290C WG here and at MTG:
https://www.audiokarma.org/forums/i...e-h290s-pi-h290c-and-others-compared.1019663/
https://www.pispeakers.com/catalog/product_info.php/products_id/105
I don't really like the WG that he uses but the standard JBL or XT could be used:
https://www.lencoheaven.net/forum/index.php?topic=30087.0
https://www.lencoheaven.net/forum/i...ick896ucnfm46&topic=30087.msg391702#msg391702
JBL 2226H are about $500 each, ouch!
See the PI H290C WG here and at MTG:
https://www.audiokarma.org/forums/i...e-h290s-pi-h290c-and-others-compared.1019663/
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With "here" did you mean here?
I must admit I'm still learning how to read these graphs. What should I be looking for?
I asked Wayne about adapting the 4pi for a different enclosure and he strongly dissuaded me. Perhaps there's something in the 4pi forum/writings that will educate me on the application of the DE250. I'll add it to my rapidly growing list of homework ;0)
Unrelated, I got good price on a pair of Faital 15PR400. I'm going to try and model some enclosure and tuning options around that. Two approaches, the raw cabinet with its existing minimal bracing – sort of a "control" – at 6.21cf, and then the two chamber approach.
Here's the link, scroll down to the 1.4" tests:
https://www.mtg-designs.com/tips-tricks-tests/waveguide-shootout
I'm not sure why you seem to just like certain parts but that horn is not a CD WG and therefore it doesn't
follow the normal CD response shape and will not work with Econowave crossovers.
We look for reasonably smooth response because it indicates that things are not resonating and that
the horn is a good design. Now that the math is understood really well for CD guides they should be
able to plug in the numbers and get a high performance WG. This is probably why some very different
horns, but all with OS tapers measure VERY similar and smooth - the math was right.
Look at 5-10 1.4" guides with different drivers at MTG and they all have MANY resonances in the response.
Oh the other hand, WGs can be sensitive to the driver used and I discovered through other people's
measurements that the JBL 6X12" WG that performs so well has an even smoother response with the
(cheap) JBL driver it was designed to work with. I don't think that anyone has tried this combo and measured it:
Besides Mike at AMPSlab.
The first curve is the JBL WG on the driver designed to work with it, the second set of curves red trace is the
same WG with the Selenium driver that is so often used in Econowaves:
https://audiokarma.org/forums/index...6x12-econowave-guide-ph612-h6512-jbl.1005410/
EarlK designed a nice crossover for the combo in simulation by tracing curves:
Look at the first plot, black and red curves are raw driver, green is through the crossover:
https://www.audiokarma.org/forums/i...l-2414hc-on-jbl-6x12-clone-waveguide.1019895/
Nice, very smooth.
https://www.mtg-designs.com/tips-tricks-tests/waveguide-shootout
I'm not sure why you seem to just like certain parts but that horn is not a CD WG and therefore it doesn't
follow the normal CD response shape and will not work with Econowave crossovers.
We look for reasonably smooth response because it indicates that things are not resonating and that
the horn is a good design. Now that the math is understood really well for CD guides they should be
able to plug in the numbers and get a high performance WG. This is probably why some very different
horns, but all with OS tapers measure VERY similar and smooth - the math was right.
Look at 5-10 1.4" guides with different drivers at MTG and they all have MANY resonances in the response.
Oh the other hand, WGs can be sensitive to the driver used and I discovered through other people's
measurements that the JBL 6X12" WG that performs so well has an even smoother response with the
(cheap) JBL driver it was designed to work with. I don't think that anyone has tried this combo and measured it:
Besides Mike at AMPSlab.
The first curve is the JBL WG on the driver designed to work with it, the second set of curves red trace is the
same WG with the Selenium driver that is so often used in Econowaves:
https://audiokarma.org/forums/index...6x12-econowave-guide-ph612-h6512-jbl.1005410/
EarlK designed a nice crossover for the combo in simulation by tracing curves:
Look at the first plot, black and red curves are raw driver, green is through the crossover:
https://www.audiokarma.org/forums/i...l-2414hc-on-jbl-6x12-clone-waveguide.1019895/
Nice, very smooth.
Stumbled across this test of the Faital Pro CD and horn, tests much better here, and the distortion is good until the top end
where it gets quite bad at over 5%:
https://audioxpress.com/article/tes...ession-driver-coupled-with-lth142-60-o50-horn
where it gets quite bad at over 5%:
https://audioxpress.com/article/tes...ession-driver-coupled-with-lth142-60-o50-horn
For those of you with both DSP and crossover design experience: is it feasible to do a hybrid setup where a 1.4" CD with strong low end performance (i.e. the HF146r in my case) is crossed to a 1" (i.e. DE250) with a passive xo, all sitting behind the DSP?
I should say, I'm asking this as "food for thought" for down the road. Remember, the spirit of this build is using these readymade cabinets as a flexible platform for experimentation..
I should say, I'm asking this as "food for thought" for down the road. Remember, the spirit of this build is using these readymade cabinets as a flexible platform for experimentation..
A general project update (for my own edification, if anything):
I've taken some new measurements and calculated the predicted bracing I'll be adding – net volume will be 5.78cf / 164L.
Got some misc. shop tools I needed to cut the baffle.
Plan on using 2 circular ports 2.75" ports for now – seems like the most flexible system for tuning adjustments.
Presumably I need to add some protection to the CD. I haven't been able to find a clear answer on whether or not the minidsp provides sufficient protection on its own.
Also, these speakers are big – currently scratching my head on how to get good measurements. Using the typical farfield formula has these things 16.5ft off the ground, which seems totally untenable.
Attaching some graphs here of the 15PR400.
be gentle with me – i'm still learning to read these!
(n.b. i'm using Speakerbox Lite – will probably switch to VituixCAD once I have a Windows virtual machine sorted.. Apple Silicon is a pita..)
I've taken some new measurements and calculated the predicted bracing I'll be adding – net volume will be 5.78cf / 164L.
Got some misc. shop tools I needed to cut the baffle.
Plan on using 2 circular ports 2.75" ports for now – seems like the most flexible system for tuning adjustments.
Presumably I need to add some protection to the CD. I haven't been able to find a clear answer on whether or not the minidsp provides sufficient protection on its own.
Also, these speakers are big – currently scratching my head on how to get good measurements. Using the typical farfield formula has these things 16.5ft off the ground, which seems totally untenable.
Attaching some graphs here of the 15PR400.
be gentle with me – i'm still learning to read these!
(n.b. i'm using Speakerbox Lite – will probably switch to VituixCAD once I have a Windows virtual machine sorted.. Apple Silicon is a pita..)
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