Hello all. I seem to have replaced all the speakers in my various listening situations to FR driver based systems. One difficulty has been finding powerful drivers for situations that need it. Looking into coaxial brings up threads listing the negative issues with existing units, as well as some threads on DIY stuff. MEH has been pointed out as one path, but it does take up some horn space
Would like to propose a community developed DIY driver that can be assembled at home from a combination of off the shelf parts and homemade bespoke parts. I have a number of ideas and thoughts on this and, judging by past threads, so do many others. We have already encountered the issues suffered by these drivers in those threads, so time to move on to exploring practical DIY solutions
I also propose that such a project should be economically biased towards the DIYer as well be solid and sound in performance and reliability. Ability to be hung of 100wrms and a native flat response would be good targets to aspire to, and the dynamic range to run some favourite Eq curves. These requirements would likely result in a driver not suited to very small amps so let's acknowledge that here
Point source fans would also be aware of the design of most of the drivers raised in the previous coax threads, so let's first round up some more units that try to make an attempt at cleaning up the HF
Here is a new one for me. What looks like a whizzer is not part of the woofer section. It doesn't move and forms a guide for the tweeter. I am aware of those older type large woofers with rectangular horn over the coax tweeters. This driver seems to differ a bit by trying to balance woofer cone depth and guide height by taking a flatter approach. Could this be the approach to explore for the community development? I want to investigate this approach in detail by combining an extended range subwoofer/woofer and a FR or tweeter that can go low. The donor woofer would have a large enough dust cap that can be removed to mount a custom throat that can retain the higher frequency driver and the woofer vent large enough to run a line to a volume mounted behind the woofer magnet. If we can find the right donor woofer and HF driver, then we can place a custom foam overlay on the woofer cone to change its dish to a flatter one while matching a waveguide to the HF unit that will ensure zero interference with the woofer cone surface. I have a feeling this can work with enough development effort. The overlay can be made easily with DIY jigs, and I am able to demonstrate that. At some point I will attach some FreeCAD files that we can pull and tweak for the guide and HF throat, line and volume and this can be printed at home
For anyone thinking of IP type issues here, let's be fair, if anyone can take any ideas from the thread and commercialise it, well make it good enough to be worth my while and I will buy them from you!
Would like to propose a community developed DIY driver that can be assembled at home from a combination of off the shelf parts and homemade bespoke parts. I have a number of ideas and thoughts on this and, judging by past threads, so do many others. We have already encountered the issues suffered by these drivers in those threads, so time to move on to exploring practical DIY solutions
I also propose that such a project should be economically biased towards the DIYer as well be solid and sound in performance and reliability. Ability to be hung of 100wrms and a native flat response would be good targets to aspire to, and the dynamic range to run some favourite Eq curves. These requirements would likely result in a driver not suited to very small amps so let's acknowledge that here
Point source fans would also be aware of the design of most of the drivers raised in the previous coax threads, so let's first round up some more units that try to make an attempt at cleaning up the HF
Here is a new one for me. What looks like a whizzer is not part of the woofer section. It doesn't move and forms a guide for the tweeter. I am aware of those older type large woofers with rectangular horn over the coax tweeters. This driver seems to differ a bit by trying to balance woofer cone depth and guide height by taking a flatter approach. Could this be the approach to explore for the community development? I want to investigate this approach in detail by combining an extended range subwoofer/woofer and a FR or tweeter that can go low. The donor woofer would have a large enough dust cap that can be removed to mount a custom throat that can retain the higher frequency driver and the woofer vent large enough to run a line to a volume mounted behind the woofer magnet. If we can find the right donor woofer and HF driver, then we can place a custom foam overlay on the woofer cone to change its dish to a flatter one while matching a waveguide to the HF unit that will ensure zero interference with the woofer cone surface. I have a feeling this can work with enough development effort. The overlay can be made easily with DIY jigs, and I am able to demonstrate that. At some point I will attach some FreeCAD files that we can pull and tweak for the guide and HF throat, line and volume and this can be printed at home
For anyone thinking of IP type issues here, let's be fair, if anyone can take any ideas from the thread and commercialise it, well make it good enough to be worth my while and I will buy them from you!
Notice the the unintruding surround on this driver:
https://www.diyaudio.com/community/threads/do-you-like-my-coaxial.411288/
That project could maybe benefit from the waveguided tweeter you show. Do you have a link for the product?
Cheers!
https://www.diyaudio.com/community/threads/do-you-like-my-coaxial.411288/
That project could maybe benefit from the waveguided tweeter you show. Do you have a link for the product?
Cheers!
It's another lil 30w driver but seems to be as well-built as my JLAudio mid-woofers. I want a 12" version of this 
https://www.aliexpress.com/item/1005006436983920.html?spm=a2g0o.cart.0.0.2a9738daiDAG2B&mp=1
https://www.aliexpress.com/item/1005006436983920.html?spm=a2g0o.cart.0.0.2a9738daiDAG2B&mp=1
Should be fairly easy to model up a basket like this using off the shelf magnets, spiders and surrounds. Would love to see some community interest in developing a DIY 12" coax like this. Would a 4" dia VC work in a circle of mangets like that? It will make it possible to design a very good chamber and WG for the HF system
I am not familiar with this tech but will look into it and add this and DML to this thread to DIY. Any recommended reading material on ESL?
But isn't even directivity a problem for ESLs? I mean they are very point source, but are they so evenly in the full frequency band?
Cheers!
How about this for an approach? A printed basket holding 4x DML type exciters, a machined foam "cone" dropped into the basket and the apex fixed to the exciter pistons. Base of cone mounted to the basket frame lip with an off the shelf rubber roll surround. This way the cone can be done with enough "vent" dia to create a chamber for a FR driver
Issues, problems, thoughts?
Issues, problems, thoughts?
The later ones with the diaphram segmented into circular bits with the signal time delayed for the ourer rings so as to emulate a sphere. Quite clever,
The 57s are short higher frequency line source with 2 flanking “woofers”. 1 set isn’t really enuff.
dave
WAW/FAST, aren't these just two-ways like all of my current systems? I am currently running a 2.75" FR as HF and 7" sub as LF sections in a two cab stack as active two-way with 350hz xover
That's the 3 odd inch FR system that I need to upgrade in the OP to a higher power HF system. I have been trying to find a clean, higher power point source system for two years now. The highest power FR driver that I can find is already in the system and only 40wrms rating on the driver
So yes, WAW is very point source (I can still hear my voice shift to the 7" frequently, so not complete point source) and needs upgrading to higher power system
Is there an array of 3" FR drivers that can retain the FR point source sound? What happens to a circular array of drivers on a convex baffle with one in the centre?
That's the 3 odd inch FR system that I need to upgrade in the OP to a higher power HF system. I have been trying to find a clean, higher power point source system for two years now. The highest power FR driver that I can find is already in the system and only 40wrms rating on the driver
So yes, WAW is very point source (I can still hear my voice shift to the 7" frequently, so not complete point source) and needs upgrading to higher power system
Is there an array of 3" FR drivers that can retain the FR point source sound? What happens to a circular array of drivers on a convex baffle with one in the centre?