Camplo

On 10/12/2021 at 9:06 AM, peniku8 said:

Tbh I'd personally buy a large enough 3D printer. I have all kinds of equipment, which includes a CNC router, but even then, making horns is something I'd find cumbersome to do. Doing it on the CNC would require doing it in something like 1" slices. Doing it by hand with something like a large Dremel... inaccurate and really tideous work...

why wouldn't you choose a wood router over 3d printing? wood is an excellent material to create a thick non vibrating horn. If aiming for a large horn, I would think a large cnc router would make the most sense...Take model, slice into layers, route, glue together. Its how the shops make horns out of wood normally...because it works...

Have yet to see a large 3d printed horn. Not saying it can't be done.

reading a qes that is dbl spec....whats the chances of this getting to spec via break in?

Hello, I'm new to the forums but not to loudspeaker design....Its funny how many people don't know what the think of group delay, what it is and what it means to Sound Quality....I'd like to believe that I am one of the first people in recent times, within the DIY community to make connection between the Group Delay Curve and the Time to Peak energy curve...the trend of both lines. 

When it comes to describing a sub as tight...No one is ever specific enough of what they are talking about...imagine that....If I say I want a tight woofer....am I speaking of time to peak energy or time to -25db energy? Both ..... Now that I have made known the to aspects of Time distortion....it must be made known that inside of a "room"...the room dominates all of these specs (Phase, FR, GD and Decay times).....phase can cause strange anomalies.....you can only expect direct energy measurements to be more faithful in a faithful within a nearfield situation but within 1 meter measurements of my current home system incorporating dual 12"s, I have anomalies non the less....as if near field didn't matter lol.

Regarding driver size....everyone that the epitome of Sound Quality is low excursion......See it move....see it distort. So a large driver needs to move less in order to achieve the same spl as  a smaller driver thus distortion is less.....Multiple drivers can be using to increase accumulated surface area for a range of spectrum. These multi drivers boost efficiency and drive down excursion resulting in the same lowering of distortion.

If your driver only has to move a few MM to achieve desired output, you no longer have to worry about thd or dynamic compression/power compression

Quote

 Bass doesn't stop at 100 Hz, and bass up to 200 Hz and beyond can be very tactile if the sound is neutral enough to perceive it.  Too many systems with big subs are woefully inadequate in the crucial upper bass region because the are too small to keep up with the subs.  This is all the more important for a "tight" sound.

Agreed, I've been taught by the guys at Diya and over and over its touted that a 15" is the apex midrange. I also agree with much thats said in the above post, just wanted to add my 2 cents 😃

Oh ya! another thing! vented boxes tuned lower, will have lower group delay in the areas away from the tuning note. The lower you move the tuning note aka Fb.....the better group delay is in the area in perspective to the tuning note....I'm not looking at horn resp right now but I think the same trend will happen with Sealed boxes as you move the Fc lower via Box size....

Im having an issue where my acoustic elegance drivers (15m and 18h+) are showing 75% bl 

any reason why this would happen, using the dats v3??