New Line Array - 16 x TC9FD18

[limacon]

Hi!

Several boxes of new old stock arrived with me today. I have 64 TC9FD18 drivers to work with. What should I do?

 

[Halair]

Do you want a finite line array or infinite line array?
Do you intend to use it as full range or assist with sub and tweeter?

Welcome to the Linesource Club

 

[limacon]

A quick 2x2 — liking the vocal qualities.

Aiming for finite. 16pcs. Backed up by dual opposing 15p80nd, perhaps.

 

[limacon]

I have been considering a clever but short side exit exponential stuffed aperiodic port per driver or a group of drivers. I need to find Leonard Audio again so I can sim the box resonances.

 

[xrk971]

I think Melotheory made an aperiodic rear chamber line array with the TC9FD a while back. I don't know if it is necessary - seems like a well stuffed sealed works very well. If you can make a tapered rear shape to act as an acoustic black hole, that reduces back reflections.

The Supernova! (a full range flooder line source)

 

[wesayso]

Do you plan to use shading? With a finite array I know I would. I'd consider a CBT array as one of the best ways to do a finite array.

 

[wesayso]

Hey, I do remember seeing a reply here, where did it go?

 

[limacon]

Whipped up a quick baffle. Making the back box now. Not sure about the “wave guide” exit. I may be more scientific about that later. I might wrap the baffle in red leather and paint the back box black.

 

[wilbur-x]

We made some pairs:

 

[limacon]

That’s a mighty interesting rear chamber! Does anyone have an offline installer for Leonard Audio?

Looks good too!

DTP Line Source

 

[Sub Sonic]

We made some pairs:

Looks cool. Are they closed transmission lines?

 

[wilbur-x]

Thanks, they were also lightly stuffed with wool. It's rather a progressive damped rear chamber. Works fine. It also add imense stiffnes to the column.

 

[limacon]

Very quick stuffed test 3 parallels of 3 per enclosure. at the moment 0.85L sealed per driver. Rounded back will take that to 1.1L per driver. Cat busy watching cables...

 

[fluid]

Nice job You have access to some really nice tools to make speakers with. I've just bought myself a CNC kit to be able to make things that would be difficult without it.

Did you model the effect of the cavity you have introduced in front of the drivers in ABEC? I'm interested because if I was to make another cabinet for my array I would want to try some things out in ABEC before I committed to building.

 

[limacon]

My aircraft interiors business has a machine shop so lots of CNC toys here.

I’ve smoothed the exit out a bit with an ellipse radius in solidworks.

At this shallow depth I don’t know if the vertical arrangement will work. Here’s a pic of the smoother version.

 

[limacon]

Starting to take shape.

 

[Halair]

Looking real good

I particularely like the satin black finish, you gonna clear coat it?
Also, what kind of primer did you use?

 

[limacon]

Bead blasted the aluminium and then applied a black epoxy textured powder coat.

 

[limacon]

Perhaps a modular system will exhibit problems.
https://www.diyaudio.com/forums/full-range/349356-corner-line-array-28-tc9fd18-2.html#post6078059

 

[fluid]

Those problems will be much worse using a smaller line of drivers if you were to only use one of your 16 driver arrays. 75% floor to ceiling coverage plus is where an array becomes most like the theoretical infinite array.

Awesome finish on the baffle

Some Fibreglass felt and wires and you will be away.