Line Array Construction Diary (56k warned)

[gastro54]

This is the line array I am builing with design help from johnf. The deisgn is for 16 NSBs per speaker with one Pyle titanium tweeter in the center



The other one is gluing right now, as I dont have enough clamps to glue botch at once

[sqlkev]

gluck with the holes, I hated it when I did mine

BTW, how's ur xover will be like?

[gastro54]

Yea, some of the holes on the other baffle got conjoined I'm not sure what I am doing for the xover yet. I am going to see what is like without xover and tweak from there.

[AnthonyPT]

Hi Your project looks interesting. Are you going to line
taper the drivers? I have been tapering 16 TB 3in drivers
and if you sit in the right place it sound really nice even
without a tweeter or tweeter array. Maybe a set of 12 tweeters
a side when funds arrive. The amazing things is the detail you hear and using around 2 -5 watts of power ! Hard to go back to
more mundane designs.

regards

[warren o]

Line arrays are THE thing for FOH touring sound now. They are impressive with DSP.

The home sized lines I have read about seem to have great imaging. Please post completed pics & a sound review upon completion. Interesting.

[gastro54]

I am not planning to taper the drivers atm, and instead, just wire them 4x4. Also a question: The variable L-Pads I got to adjust the tweeter are rated to 15w, am I going to be in danger of destroying the L-pad? (The tweeters are rated up to 75w).

I am building the speakers both for personal satisfaction and for highschool (elective called advanced topics and problems in physics). I chose to build the line arrays because 1) according to the opinions oof many on this board, they sound phenomenal 2) cheap (%0.50 per driver?!) and 3) they are big

[gastro54]

the right speaker:

[johninCR]

It's a great idea for a physics project that you can really use afterward. Focusing the sound within the plane of the array is an amazing phenomenon to demonstrate. With arrays that tall, you may have to bring a ladder so everyone has a chance to get their ears above the array in its nearfield. A friend on another forum is a physics teacher who built a similar array for classroom demo and the students loved it.

Since you are in the advances physics maybe you can explain to me why it works.

[mazeroth]

I would highly suggest power tapering in your situation, with only a single tweeter. Something like a 5-3 T 3-5.

[gastro54]

Originally posted by johninCR
Since you are in the advances physics maybe you can explain to me why it works.

Well, right now I am in the building phase of the project, and have not done that much research on the physics of line sources. That's the boring part I'm saving for last

Originally posted by mazeroth
I would highly suggest power tapering in your situation, with only a single tweeter. Something like a 5-3 T 3-5.

I looked into it some, and it seems like that would be a good idea, especially with one tweeter. A wiring like this would give a resistance of about 8.5 ohms right?