BillFitzmaurice.info

Dave Non-Zero wrote:yeah but the point is - you thought about that before doing it.

OMG Don't say they've actually finally found a man who follows instructions Wonders will never cease.

next he will be asking for directions when he is lost!

The throats closed with foam plugs:



The trimmed quartet:



The quartets cleaned from the cutting residues and ready for gluing:



Arrays glued and left to dry:

Wait, the grills get their own jig but the poor arrays just get to get glued on a piece of square stock? No jig for the glue up?

That is beautiful work!

So someone was saying that they liked the colored piezo arrays and that was making me wonder. Can you paint these arrays or did they find hot pink piezos on ebay? I really like the colored arrays too.

Thanks for the answers on the DIY glue too. I am totally going to try it.

mpm32 wrote:Wait, the grills get their own jig but the poor arrays just get to get glued on a piece of square stock? No jig for the glue up?

LOL, I was going to ask why no pictures of the 45 degree angle cutting jig after seeing the pics of the jig for cutting the sides.

mpm32 wrote:Wait, the grills get their own jig but the poor arrays just get to get glued on a piece of square stock? No jig for the glue up?

The Piezos already got their share of fancy jigs...
K.I.S… I.P

(If Possible…)

The melded arrays are melded…



I must say I am really impressed with this DIY glue. Very easy to apply, and the result looks as if it was joined by Ultrasonic welding:



The arrays wired:



Diffusers installed:


I've arranged this test setup to see what the melded arrays actually produce:



This is the response curve:



Not so clear in the picture, but the Piezos 'wake up' just over 1 kHz. With the X-over high passing at around 1.5 - 2kHz that looks good.
The two significant peeks at 4kHz and between 6 and 8kHz will be easily trimmed with the send EQ.

Next: final assembly

Forgot to show a little tip/trick regarding attaching the melded array diffuser…

Before attaching the diffuser tube to the array, I folded around it a long piece of fine grit sandpaper,
and while pressing it lightly in its intended position, I slid it along the tube axis up and down a few times.
This achieved two things: it marked exactly where the contact points are so I knew were to put the adhesive,
and also it roughened those points a little so the adhesive would grip better.

Here after marking with the sandpaper:



I used black silicone compound for attaching the diffuser tube – a bead to each mark/point.
The diffuser tube is made of 16mm (5/8") house plumbing pipe.
Its outer and inner layers are Polyethylene and an Aluminum layer in between (locally known as SP)

Here a close-up of the contact points (and pipe section…):

I can't get black pipe here the right dia, so I have to settle with grey and spray paint it black!

So does it do anything to the sound to paint the whole thing when it's done. If it's ok to do what prep/paint should be used.

I found some 5/8" clear acrylic tubing and spray painted the inside. Came out nice and shiny!

matthewmdn wrote:So does it do anything to the sound to paint the whole thing when it's done.

Only if you listen with your eyes

matthewmdn wrote:If it's ok to do what prep/paint should be used.

A little scuffing...and some Krylon in a rattle can. And your done!

Tom Smit wrote:

matthewmdn wrote:So does it do anything to the sound to paint the whole thing when it's done.

Only if you listen with your eyes

matthewmdn wrote:If it's ok to do what prep/paint should be used.

A little scuffing...and some Krylon in a rattle can. And your done!

I have never bothered to paint tweest, but shouldn't the opening be plugged up since the new piezos are glued?

SeisTres wrote:

Tom Smit wrote:

matthewmdn wrote:So does it do anything to the sound to paint the whole thing when it's done.

Only if you listen with your eyes

matthewmdn wrote:If it's ok to do what prep/paint should be used.

A little scuffing...and some Krylon in a rattle can. And your done!

I have never bothered to paint tweest, but shouldn't the opening be plugged up since the new piezos are glued?

Yup, that too.