Jump to content

DIY audio: what are you building?


Recommended Posts

3 hours ago, Nada said:

 

Your wasting too much time using printing paper. You want to go for the pre-cut stuff on a convenient dispenser for quick unrolling like:

 

200px-Toilet_paper_orientation_over.jpg

 

and then just spay it with glug.

Good idea.

What is a good release agent for the wood glue ?

Link to post
Share on other sites
  • Replies 7.1k
  • Created
  • Last Reply

Top Posters In This Topic

Top Posters In This Topic

Popular Posts

Stereo Subs & Two Way Monitor Build   It’s been slow going on my two way monitor with stereo sub build but I’ve finally finished finished one of the two subs!!!   The subs are 10inch CSS drive

Just some little PC speakers.   Focal, Minidsp, Rotel...and CNC. Working From Home setup.    

Finally finished my 6sn7 preamp. ? not a bad outcome considering 50% material was recycled. Thanks a lot mwhouston for schematics.

16 hours ago, Nada said:

 

Your wasting too much time using printing paper. You want to go for the pre-cut stuff on a convenient dispenser for quick unrolling like:

 

200px-Toilet_paper_orientation_over.jpg

 

and then just spay it with glug.

 

@Upfront a great suggestion this one from Nada and a wonderful insurance policy if in the unlikely event that your speakers ever hit that elusive brown note once up and going. 

  • Like 1
Link to post
Share on other sites
1 hour ago, shaky said:

 

@Upfront a great suggestion this one from Nada and a wonderful insurance policy if in the unlikely event that your speakers ever hit that elusive brown note once up and going. 

Gday Shaky

I think Linc is safe from the brown note from the paper horn as I don't believe that particular note (tone) can be reproduced by it as it's outside the operational bandwidth

(had experience with this one)

haha:P

Cheers

Link to post
Share on other sites

Bringing my AR93 Speakers back to life after 7 years sitting in the shed. The drivers are all up and working nicely now. Only had to replace the mids (used some Yamaha mids 8") and one tweeter (found an original AR unit locally), with the four woofer units all in good order. Fired in up yesterday with my 1020B/ 2140 Nad amp and Matra Manticore TT and sounded very nice. Have just bought some speaker grill cloth (lots) and now working on the grill socks for these beasts, I've even got the speaker stands that can with them- very wife unfriendly looking units lol

Net Pics of the beasts - will post my pics once socks finished.

 

 

Acoustic Research AR-93.jpg

Edited by Eddierukiddingvarese
Link to post
Share on other sites


16 hours ago, Upfront said:

......Wanted at least the inner layer to look nice. So will see how it dries then think about different layers.

 

The paper mache horns built the way your doing it look beautiful. They remind me of delicate flowers:

Inslow paper horns.jpg

Id say its definitely worth the effort your going to in order to achieve that petal look and it might also be vital for symmetrical shrinkage and resonance control.

 

One idea Id like to suggest for outer layers is to tear the strips into V-shapes to match the horn fare?

 

Im very impressed by your project and look forward to loads more pictures please :)

 

 

Edited by Nada
  • Like 1
Link to post
Share on other sites
 
The paper mache horns built the way your doing it look beautiful. They remind me of delicate flowers:
Inslow paper horns.jpg
Id say its definitely worth the effort your going to in order to achieve that petal look and it might also be vital for symmetrical shrinkage and resonance control.
 
One idea Id like to suggest for outer layers is to tear the strips into V-shapes to match the horn fare?
 
Im very impressed by your project and look forward to loads more pictures please [emoji4]
 
 

Thanks Nada. Your right with the V shape. Will see how it turns out after the next run. Still waiting for the first run to dry. Bloody Tassie weather!
Link to post
Share on other sites
Bringing my AR93 Speakers back to life after 7 years sitting in the shed. The drivers are all up and working nicely now. Only had to replace the mids (used some Yamaha mids 8") and one tweeter (found an original AR unit locally), with the four woofer units all in good order. Fired in up yesterday with my 1020B/ 2140 Nad amp and Matra Manticore TT and sounded very nice. Have just bought some speaker grill cloth (lots) and now working on the grill socks for these beasts, I've even got the speaker stands that can with them- very wife unfriendly looking units lol
Net Pics of the beasts - will post my pics once socks finished.
 
 
Acoustic Research AR-93.jpg

Looking forward to seeing it made. I like photos!
Link to post
Share on other sites

I had doubts how this horn would go with no glue on the inner layer (sugested on many forums) so rather than adding extra layers I removed it from the mold for a look, and in the interest of "warts and all" DIY sharing....
ecee1c580a7c9c63d7d7d8203a5a77ad.jpg
I don't see it as unrepairable. But will put this one aside for now and start fresh.


So the mold has been cleaned, repolished and soap added again as the release agent.... take 2!
  • Like 1
Link to post
Share on other sites


Looks ok to me, all you really to do is mix a weak mix of PVA and water which will soak and soften those loose strips and smooth them down. I'm sure they will settle down nicely.

Good work.

Sent from my Moto G (4) using Tapatalk

  • Like 2
Link to post
Share on other sites
51 minutes ago, Upfront said:

813638500861d31c10b93a2da7e95e31.jpg4dd6f32d7258979f77143ba98b6f83c5.jpg
Much better second time around. Neater. Just hope it comes off the plug!

 

What kind of soap did you apply as a release agent and how thick?

I read the Insound page and petroleum grease was recommended but would stain the paper.

I wonder how a generous layer of car wax would work?

Otherwise glad wrap smoothed down longitudinally and twisted at the top into a handle would allow the horn to be pulled off neatly maybe ?

Link to post
Share on other sites
 
What kind of soap did you apply as a release agent and how thick?
I read the Insound page and petroleum grease was recommended but would stain the paper.
I wonder how a generous layer of car wax would work?
Otherwise glad wrap smoothed down longitudinally and twisted at the top into a handle would allow the horn to be pulled off neatly maybe ?

I used a generous amount of washing up liquid. Enough so the entire surface was covered but not enough to leave streaks on the surface. Hopefully enough. The mold was highly polished before the soap was applied. I used a heavy cut and polish till the surface was immaculate then a pure polishing compound. I read about the vaseline but didnt want the paper stained. Would have been much easier to remove if i had done though.
Link to post
Share on other sites


9 minutes ago, Upfront said:


I used a generous amount of washing up liquid. Enough so the entire surface was covered but not enough to leave streaks on the surface. Hopefully enough. The mold was highly polished before the soap was applied. I used a heavy cut and polish till the surface was immaculate then a pure polishing compound. I read about the vaseline but didnt want the paper stained. Would have been much easier to remove if i had done though.

 

Good work. Should release fine despite the paper shrinking onto the mold as it dries.

Otherwise what do you think of the glad wrap idea on top of polish for the next run so theres a way of pulling the horn off from the top from the inside?

Link to post
Share on other sites
 
Good work. Should release fine despite the paper shrinking onto the mold as it dries.
Otherwise what do you think of the glad wrap idea on top of polish for the next run so theres a way of pulling the horn off from the top from the inside?

Hoping so. I used more dish soap than last time hoping for less damage to the outer.
Not sure about the glad wrap. I tried to use it for the original plug with no success. Its much less pliable than i remember. I'm sure it could be done though. Long, thin triangles starting at the top. Would be a slow process. If it worked it would be well worth it.
Link to post
Share on other sites
35 minutes ago, Upfront said:

......Not sure about the glad wrap. I tried to use it for the original plug with no success....

 

Scrap that glad wrap idea then. I didn't realise you had tried it unsuccessfully.

 

For my next idea how about next time your making a new  mold eg for a huge bass horn how about casting so the upper 1/3 of the mold pulls out of the lower mold with the horn attached?

Link to post
Share on other sites
 

For my next idea how about next time your making a new  mold eg for a huge bass horn how about casting so the upper 1/3 of the mold pulls out of the lower mold with the horn attached?


You've lost me there mate. Can you reword it please?
Link to post
Share on other sites


3 minutes ago, Upfront said:

.. Can you reword it please?

 

 

imagine chopping the top third of the mold off just above the flare

then reattach with a dowel so the mold is perfectly aligned but splits in two when the upper part is pulled up vertically

when making the mold that could all be cast in

now imagine youve finished layering up the horn which is becomes really well stuck onto the mold having shrunk with drying

the horn will mainly adhere to the more vertical aspects of mold as it contracts ie the upper third

so when you pull up the upper mold the horn follows releasing from the lower mold

the final release should be easy by inverting the horn so the mouth is towards the ceiling, then  gripping the horn around the narrow part and tapping the upper mold out against a bench

more confused now?

Link to post
Share on other sites
 
imagine chopping the top third of the mold off just above the flare
then reattach with a dowel so the mold is perfectly aligned but splits in two when the upper part is pulled up vertically
when making the mold that could all be cast in
now imagine youve finished layering up the horn which is becomes really well stuck onto the mold having shrunk with drying
the horn will mainly adhere to the more vertical aspects of mold as it contracts ie the upper third
so when you pull up the upper mold the horn follows releasing from the lower mold
the final release should be easy by inverting the horn so the mouth is towards the ceiling, then  gripping the horn around the narrow part and tapping the upper mold out against a bench
more confused now?

Much less confused! Thanks for that! Quite sensible. Why couldn't you have suggested this before i started!!!
Silicone next time I think in all seriousness. But then the mold would have cost me 150 bucks instead of 13 bucks.
Link to post
Share on other sites

8f5d4b573d9c58da51a4ecc20953bbf7.jpg
The throat will be cut back to fit the 3" driver so dont mind the mess but as you can see, there is a lot of surface area to mount the plate and horn mount.

  • Like 4
Link to post
Share on other sites
Pic of the AR93's with top caps off, grill socks next.
 
 
IMG_0713.JPG

What cloth did you decide on for the "socks" mate? And where did you source ot from?
Link to post
Share on other sites
1 hour ago, Upfront said:

8f5d4b573d9c58da51a4ecc20953bbf7.jpg
The throat will be cut back to fit the 3" driver so dont mind the mess but as you can see, there is a lot of surface area to mount the plate and horn mount.

Exciting, almost ready to have a look inside of the horn. :) Seems to be plenty of thickness where it matters on the throat. Shouldn't ring or resonate at all. Nice work Mate.

What about a wedge shape baffle for the mid ? Use 4 x 6" woofers. :)

 

Link to post
Share on other sites
1 hour ago, Upfront said:


What cloth did you decide on for the "socks" mate? And where did you source ot from?

Needed 1300x 800mm for each speaker, so that dictated choice somewhat- selected Duratech from Jaycar in black, which comes in 1500x1000mm packs. It looks nice and have seen it on other speakers.

Edited by Eddierukiddingvarese
  • Like 1
Link to post
Share on other sites
Shouldn't ring or resonate at all. Nice work Mate.
What about a wedge shape baffle for the mid ? Use 4 x 6" woofers. [emoji4]
 

Your right about it resonating mate. Should be interesting. Its 7 "laps" of paper. I use the term laps because of the amount of overlapping with each layer. So 1 lap can be 2 or 3 layers depending on how tight you lay the strips together. So basically my 7 laps equals roughly 18 layers.
As for drivers, I'm thinking simple Matt. One singe driver. As I said earlier, either Peerless 830869 or Dynaudio MW162. Thinking the Peerless is the go though.
Anyone have other suggestions?
Link to post
Share on other sites
39 minutes ago, Eddierukiddingvarese said:

Needed 1300x 800mm for each speaker, so that dictated choice somewhat- selected Duratech from Jaycar in black, which comes in 1500x1000mm packs. It looks nice and have seen it on other speakers.

The AR93 VWUFSS- Very Wife UnFriendly Speaker Stands repainted.

AR93 Stands.JPG

  • Like 1
Link to post
Share on other sites
The AR93 VWUFSS- Very Wife UnFriendly Speaker Stands repainted.
AR93 Stands.JPG

Nice job mate. Hopefully the splash of black paint will help with approval from the department of domestic affairs.
Link to post
Share on other sites
1 minute ago, Upfront said:


Nice job mate. Hopefully the splash of black paint will help with approval from the department of domestic affairs.

The domestic dept thinks the paint job looks alright but not sure about them in the house under the speakers................

Link to post
Share on other sites
The domestic dept thinks the paint job looks alright but not sure about them in the house under the speakers................

Haha! Tell her there is less chance of dust gathering under them if they are in!
Link to post
Share on other sites
The domestic dept thinks the paint job looks alright but not sure about them in the house under the speakers................

A pair of shoes always sways the decision

Sent from my LG-H961N using Tapatalk

  • Like 2
Link to post
Share on other sites
18 minutes ago, Upfront said:


Haha! Tell her there is less chance of dust gathering under them if they are in!

Keep them coming, all help gratefully accepted- dust good idea (Upfront) and shoes (Deano you guess the domestic dept's weak spot)

  • Like 2
Link to post
Share on other sites
19 hours ago, Upfront said:


I used a generous amount of washing up liquid. Enough so the entire surface was covered but not enough to leave streaks on the surface. Hopefully enough. The mold was highly polished before the soap was applied. I used a heavy cut and polish till the surface was immaculate then a pure polishing compound. I read about the vaseline but didnt want the paper stained. Would have been much easier to remove if i had done though.

A water or oil based lubricant wont do anything ?

Edited by Swarm
Link to post
Share on other sites
A water or oil based lubricant wont do anything ?

Possibly. And I'm open too sugestions. Not exactly sure how well the dish soap will release. What were you thinking? Silicone spray? If so what do you take it off with to paint?
Link to post
Share on other sites
On 29/12/2016 at 7:51 PM, Upfront said:

Music is the important part mate!

Still havent decided on a mid bass driver.

Peerless 830869 maybe?

Or Dynaudio MW162

 

I imagine the mid-bass needs to keep up with the horn and have similar directivity? 

How about making a nice big mold for a nice big paper horn?

Otherwise OB might work ?

 

Link to post
Share on other sites
1 hour ago, Upfront said:


Possibly. And I'm open too sugestions. Not exactly sure how well the dish soap will release. What were you thinking? Silicone spray? If so what do you take it off with to paint?

Like personal lube. but i guess it would dry like detergent

  • Like 1
Link to post
Share on other sites
2 hours ago, Upfront said:


Possibly. And I'm open too sugestions. Not exactly sure how well the dish soap will release. What were you thinking? Silicone spray? If so what do you take it off with to paint?

Don't use silicone spray if you intend to paint it. It's almost impossible to remove from a smooth surface, and would be even worse on a surface that had any sort of texture. The spray painters where I worked hated the stuff with a passion.

  • Like 1
Link to post
Share on other sites
 
I imagine the mid-bass needs to keep up with the horn and have similar directivity? 
How about making a nice big mold for a nice big paper horn?
Otherwise OB might work ?
 

I'm trying to keep it small so it can sit on the bench in the shed. So horns for the bottom end are out but small OB could work good idea. Up untill now I've been thinking of a sealed box. But a box done my way! [emoji38]
Link to post
Share on other sites
  • Recently Browsing   0 members

    No registered users viewing this page.




×
×
  • Create New...