[jeffac]

I'm using the slightly thinner (5.0 mil) version of the 3M VHB tape (9469PC rather than 9473PC) and no probs so far. Technically might even be more desirable.

Tripath 2020 amp driving capabilities.. I'm using a Charlize T-amp with that chip and with my 4 x exciter panels, fed a std 2Vpp via a 10K ladder attenuator from my DIY-DAC, playing loud in a very large room is at about 3/4 setting. I'd like more headroom though, and as I have a second Charlize, might bring this into action.

zygadr, good to hear you've eventually found good quality CC, and in close to the large sizes I've found here. Still to pick up the dual-flute Xitex CC feebies, I need a ute 

cheers..jeffac

PS. zygadr 

[DanTheMan]

Ziggy, are you going to coat them?

[pol_bct]

welcome back (I read your erased post)

> I placed two exciters on one sheet only......

I hope you did a try in stereo?

POL

[Tinnitus]

WELCOME BACK ZYGADR!!!
I was just composing a post to persuade you not to give up, so I'm very glad you've beaten the disapointment of those boards bending.
Also very glad that they sound so promising!

[jeffac]

zygdar,

Glad you cooled down and gave those trimmed down CC panels an try after all the frustration of getting them.

I must start using big font seems to get folks attention
Remember to trim the corners.
And get out the shellac.

cheers.. jeffac

[gilbodavid]

Zygdar i just got a huge 6mm sheet of cardboard home with 2 large creases from the wind! Annoying except its still usable and only cost £8. i'm waiting for time to put exciters on and then i'll be in with you all too!

Cheers, david

[cometarossa]

What the hell is "CC" sheet? 

[zobsky]

corrugated cardboard

[DanTheMan]

That's cool Zig!  Try coating one and leave the other alone--well for a while I guess.  Hopefully the coated one will be even better.  Good luck and report back.

Dan

[j gale]

Zygadr, I had much the same experience going from Gator to good old cardboard. The double walled stuff is a step up. Is that what you have? Yes mother of tone is real and alive here. I definitly want to test POL's single panel set up for stereo idea with close spaced centre exciters (bass) and near edge for the rest. I think the RIGHT treatment for cardboard to stiffen particularly the flutes will be a step forward. I worry that any of the plastic or synthetic finishes will be a negative just like plastic finishes on guitars. So what is the right stuff? Is Pol's 1/3, 2/3 line across the small dimension the answer for most bass? Should the panel have golden ratio dimensions? I am sure that the cardboard is the best we will find at any sane price.  Makes it possible to test sizes, coatings, exciter configurations etc. because a new piece is easy and cheap. It also makes you realize that the cheap exciters are superb for almost no money.  Living with it over time just confirms 1st impressions.

[fergs1]

Greetings fellas, I may have a lead for all you guys regarding cardboard for FREE! I was in  Aldi's the other day and they had these magnificently large double layered cardboard boxes for shipping smaller boxes of biscuits etc they must be 1.5 x 1.2 x1  m so plenty of material to play with. I was getting them for my children to play with as cubby houses when I realized what good quality the CC was. A lot of Aldi's foodstuffs come from Europe( a lot from germany)  and so I imagine the the boxes are made there which would account for the high quality CC. In case you don't know Aldi is a chain of supermarkets that keep their cost down by stacking in the boxes they came in, bring your own bag etc few staff except at the pay-counters , no frills. I like em. Anyway I hope thats is of some help and thanks to everyone who is making this one of the most intriguing and one of the most popular threads on OBAC to date.
                                                      peace and goodwill (that means you too jeff)    fergs

[gilbodavid]

with the 3m 9473 tape, i see it comes in half, one and two inch widths. will half inch do, and how do u fix exciters to cardboard with it, and once on, can the exciters be easily removed and refitted elsewhere with it, without damaging the cardboard? sorry if this has been explained before

thanks, david

[jeffac]

Hi David,

I have 1" tape that is ~2 mm shy of the width of the cheap PE exciter panel mounting plate. So mine overhang ~1 mm either side of the tape on 2 sides, to no apparent detrement. 1/2' tape should work fine with 2 pieces stuck side-by-side on the panel first, the backing then carefully peeled back before mounting the exciter. I then use a stiff ruler to place across of the exciter mounting pad edges, which stick out 1 mm or so, and work my way around the ring a couple of times with downward pressure to ensure good bonding. No problems so far with exciters mounted in this way.

Hope thats explained reasonably clearly. 

cheers.. jeffac

[usp1]

I used the half inch tape as suggested above and it works fine. I was not able to get it off cleanly from cardboard when I tried before.

[BowerR64]

Has anyone tried the screws yet to mount the transducers but me?

What about a screw with a pointed spike on the end? it would be similar to those metal cone speakers used in hifi

[DanTheMan]

Dan, as I saw my doctor yesterday, I asked for two of his largest syringes that he had (I reminded him that I was not in to Narcotics ) and he supplied me with two that will do the job nicely. They only hold 15ml, but that's safe to squirt the Shellac down each flute to judge penetration and effect.

Maybe there aren't enough crazies around on the flip side of the planet.  You need a few 60ml syringes around for more stubborn patients here.   They make nice water cannons for the kids as well and will keep the neighbors' cats from $#ing on the lawn.  

Can't wait to see where you go with this.  A side by side comparison will make for a nice read.

Dan

[mightym]

Here in Redneck country we get "Big'Ol' syringes at the grocery store.

We use them for injecting spice mixtures into turkeys before we fry 'em in 4 gallons of peanut oil.

[bobloblob]

For decades I've used plastic squeeze bottles with long skinny funnel-shaped tips to carry and dispense various solvents, shellac, and other finishes.  Some tips even fit tightly into small-gauge clear plastic tubing for getting into hard-to-reach areas.  I've used syringes for dispensing glue and polyester resin, so I carry those with me when I work also.  Never felt the need to use syringes for dispensing shellac, and I think a decent plastic bottle with a narrow, fine-tipped point will work better for your purposes, and will hold a LOT more shellac.  Check out the local art or arts-and-crafts store for these.

[bobloblob]

Ketchup bottles may be problematic for shellac.  Some, but not all, tend to leak when squeezed too hard, so check first.  The hole in the tip is usually too large, making it difficult to control how much shellac is dispensed.  You may find a thin tubing that will fit tightly inside the tip of a ketchup bottle, if you do choose to use a ketchup bottle, so you can control the flow a bit better, and direct it more deeply into the corrugations if using a long piece of tube.  Lighter fluid bottles tend to work well also, and the naphtha (that's what lighter fluid is) is handy for cleaning, so you can buy the bottle and empty the fluid into another container.  The bottles I use are clear with a long thin funnel-shaped tip.  The link below is to one different from the ones I use.  Seems over-priced, but it should work well, and it's from an Australian site:

http://www.craft.com.au/index.php?main_page=product_info&cPath=240_241&products_id=4279

[DanTheMan]

Luck wished.

Dan