Well, if I am at the peak of mount stupid, then you can pull me down to the valley of despair by the design or measurements.
And again, my verdict is irrelevant to my level.
I can not say a soft thing to the Directiva "as a product", because it's so unfair to the "competitor" (if I can call them) such as Neumann, Genelec, etc., they are manufacturing well balanced, properly designed products.
Only midwits cite DKE. Because they cannot articulate their position/argument in a convincing fashion.
Due to
@Acoustician signing in from Japan, I was actually asking. The behavior may have a different identity there, or not really be commonly known. There may also be some thing lost in translation here as going from Japanese to English might be creating some odd misunderstandings.
From time to time a Mozart is real, a Da Vinci is real, a Kurosawa is real.
I think it still makes sense to ask if
@Acoustician understands he/she may be overestimating their ability.
In no way was I accusing them of being at the top of mount stupid. That is not what the DKE is dealing with. I does not mean or imply you are at the top of mount stupid, so I don't think you are familiar with it.
It does suggest that even if someone is having some level of success, even some high level success, you are over estimating the nature of your true skill level in a significant way and amount. The main thing is that the person is are unaware of it yet, so in the USA we would say that you "are that guy". Most folks have been "that guy", a few times over. It is to some degree normal, especially as a person works to develop genuine confidence.
Acoustician has shown some skill in modifying another persons 3 way tower speaker design. Most measurements are currently predicted. That speaker has a great chance at measuring well on the Klipple. It might end up with a Harman score over 8.
Therefore the Directive, a 2-way speaker using an off the shelf tweeter is crap. This is despite it measuring extremely well on a real Klippel test. It achieved a fully tested and vetted, Harman score of 6.5/8.0(with sub) which is excellent if one is into the score thing.
Regarding that DXT waveguide, I have no doubt the waveguide works reasonably well. Look at all the measurements I posted earlier from 3 sources and this speakers test results. Can it be improved? Well what are your goals? My understanding of this tweeter is that the guide was optimized so that the tweeter face is still a standard size. I appears given that characteristic they are performing quite well. IMHumbleO as a hobbyist.
In any case if you read about the stated goals for the project, they have been met successfully (except for cost which is why the Purifi becomes the issue as it drives the cost way up. Though it is a great woofer if cost is ignored).
This project had specific goals and many of those goals are limiting to a degree.
via @ricksykora
"Towards the end of last year,
@amirm and I started discussing a potential audio system project that would include an open source streamer and an active speaker design. I had already been working on a DIY modular speaker concept and planned to start a design based on it, but had some other projects that needed to be completed first. This allowed me to make some adjustments to my plans and reconsider some of my original ones. Here were my goals for the speaker:
- The speaker would be active and simple to build (for me, this meant no tools beyond a circular saw but for more optimal results is more like a table saw and router).
- The design tools would be free but flexible enough to allow external data import/export.
- The design would be openly shared but FOR NON-COMMERCIAL USE ONLY.
- The cost target for the drivers and crossover would be approximately $1000 US.
- Keep the cabinet size to around 15 liters or about .5 a cubic foot or smaller (allowing it to be reasonably shipped and Amir to test). The electronics would be external. (EDIT)
- The design would allow for modest flexibility and scalability so others could (eventually) modify and add value. So, here is where Amir intervened with his ideas/goals...
- The speaker should have good directivity. Note, this did force me to reconsider some of my (mainly cabinet) plans as we'll see later.
- The speaker should use the new Purifi 6.5 woofer. As it was not in my original plans, I was hesitant due mainly to cost. However, after working on the SPK5, had them in hand and agreed to use...
This put some pressure on the budget, but the tweeter candidates were not pricey, so on to the next task (getting some help)..."
Acoustician, after you complete your tower speakers, I really do hope they sound amazing and measure well.
Share what you have done here.
If you really do have a high level of design skill, and you certainly may have it or be on your way to having it, then please contribute it here.
If the chosen tweeter and it it incorporated waveguide is a poor choice for a 6.5" 2 way, then suggest another option.
If no off the shelf option currently exists. Help the team make the speaker even better. Help design a great open source, printable waveguide that fits a great tweeter.
I'd love if I could design such a tweeter and waveguide myself.