[Alternative tweeter for Ar3a or Ar3a Improved]

On 8/20/2021 at 5:59 PM, giovanni56 said:

The attached filter scheme is deliberate, to be used on Ar3a and Ar3a Improved but also on Ar11 and Ar10pigreco

ar-3a works with 4ohm tweeter
Scanspeak is 8ohm.

is it enough to change only the crossover?  

[connect 4ohm speaker to 6ohm amp, how can I set the crossover ?]

9 minutes ago, JKent said:

What kind of receiver? I have an onkyo and I did just what Gene suggested--contacted the manufacturer and they said it's fine with 4 ohm speakers. I had planned to add a separate power amp but as long as Onkyo said it was OK I just left things as-is.

sony str-dn1080
pioneer vsx-521-k
pioneer vsx-515-s

do the speakers will be fine with this amps ?

[connect 4ohm speaker to 6ohm amp, how can I set the crossover ?]

I want to connect AR-3A to regular receiver that works with 6ohm,
What mod should I do to this speaker crossover?
(also plan to connect some 1-2ohm speaker to regular receiver, how to mod the crossover of them?)

Thanks

[Alternative tweeter for Ar3a or Ar3a Improved]

Where can I but this adapter ?
Can tweeter 8ohm replace 4ohm tweeter ?

[Need tips how to repair ar-3a tweeter coil]

2 hours ago, Aadams said:

Legopart

Are you in the US?  If so, there are two small, reputable service locations that can repair these tweeters.  If this were a simple mechanical repair more of us would be doing it. The tweeters are restored in matched pairs. 

This forum is dedicated to the restoration and maintenance of AR speakers with emphasis on originality.  If your intent is to rebuild yours with modified crossovers and drivers then this discussion more properly belongs in  the mods forum.

Aadams

Thanks!
I not from US, but I still like to contact with the stores, please send me a P.M with any information that could help to restore.
About my mode, I first plan to repair the original parts, tweeters, capacitors, potentiometers.
And then try to improve this speakers if needed.
I really like to keep the original parts from the speakers as I can. too much resources gonna waste because of this tweeter issue.   

I ordered "Vifa D19" tweeters (0.75" 8ohm much smaller then AR-3A tweeter) with some plastic adapter. but I dont think that I will use it. (I can mod it to 4ohm... but I think that the original is better even for 8ohm )

[Need tips how to repair ar-3a tweeter coil]

On 8/16/2021 at 3:23 PM, giovanni56 said:

If you have Ar3a's, I don't understand the reason to build a new crossover filter, the Ar3a's sound good with the filter that Ar came up with, it doesn't make any sense to change it, especially in the way you outlined.

I need to replace the original caps, recap the speaker.
so I plan to make a changes, measurements or even change the crossover.

 

 

what the secret behind this tweeter structure?
what is the 3 orange dots (some foam)? how they surround the dome with transparent flexible (thin glue) material ?

it not like todays caps with mesh surround that I want to apply on the cap because I cant find another method to restore it.

 

in addition the original foam material inside the tweeter dried.
(think that the same happened with the midrange and the woofer but I can't and don't want to fix it)
so I think how to repair it.
still don't know which dimensions and which foam to use
*the cracked side fixed.

 

 

Also tried to make some dome from some tv speaker paper cap,
it little bit smaller and shorter then AR-3A one, but I still can try 

the question is do it necessary, the titanium/mesh tweeters could be better,
and maybe the 8ohm tweeters is the same as 4ohm one ?

[Need tips how to repair ar-3a tweeter coil]

  

On 8/14/2021 at 3:58 PM, Giorgio AR said:

Correct, there was a dent on the dome that I fixed and as you can see from the photo the soft vinyl glue that I used to isolate the three fixing dots from the environment is still drying, now and for about two years this tweeter has been working well in this AR3a.

Tweeter dent

If I do not disturb, I will send you a message because I would entrust you with the repair of the tweeter (perhaps better to be a couple? To match the 2 tweeters?)

Thank you for your patience,

Giorgio.

If you want to take some risk, you can try to wet it (for minute or more) with distilled water and then suck it with you're mouth

10 hours ago, giovanni56 said:

 

But which speakers are you going to install those tweeters in?

 

AR-3A,

I think to use some voice coil with 4ohm (or 8ohm) for the tweeters.
each element have 4ohm (the resistance is less, something like 3+ohm)

something like that

925 point example,

where put the potentiometer (before the crossover?) ?
why do I have to choose only between 8:3 or 10:3.4 octave (do it the best preference)?
I have only 6ohm amp, how can I mod this speaker to works with it?

[Need tips how to repair ar-3a tweeter coil]

2 hours ago, giovanni56 said:

The coil is used to increase the attenuation slope of frequencies below the Fc of the tweeter's high-pass filter to avoid "breaking" the component

I plan to build some DIY crossover 2nd level.
I have umik-1 microphone to test the speakers/elements.

Can you recommend how to build the crossover for this speakers, with the potentiometers ? 

[Need tips how to repair ar-3a tweeter coil]

17 minutes ago, giovanni56 said:

MidWest MT 4121-4 4ohm. Ar3a, Ar3aMigliorato, Ar11, Ar10pigreco, Ar LST

MidWest MT 4121-8 8ohm Ar5, Ar2ax, Ar LST2. 

On Ar3a and ArLST the filter must be modified by adding an inductance of 0,105 mH in parallel to the tweeter that must be connected with inverse polarity, same thing for the 8 ohm tweeter on Ar2ax, Ar5 and Ar LST2, but with inductance of different value 0,15 mH.

what the usage of the coil ?,
I will use one when I set the crossover for the speaker.

[Need tips how to repair ar-3a tweeter coil]

I'm not from Italy.
Any professionals that can restore the dome or send another one please send me  a private message

 

On 8/14/2021 at 12:34 PM, giovanni56 said:

If you lived in Italy, I could have rebuilt them.

do you know where can I buy another paper domes?, which voice coil can you suggest, and how do you attach the cone to the magnet (the 3 dotes and do some addition glue required)?

 

accidently smash the dome again 😢

I still want to repair this one by myself somehow,
I will order addition pair someday (its too much work to send this one abroad).

about this one:
I decided the remained caps to attach to the regular surround of 0.75" tweeter, from titanium 8ohm from aliexpress (unfortunately the soft it too much but it still good) so I attach it to the paper cone

still waiting for some repair coil and maybe for some ferrofluid 

I checked the option about some regular tweeter, my 1" pair too small. and any 0.75" have this small size (and 8ohm, I need 4ohm one )
yes, the standard tweeter today is 1" one and smaller diameter and magnet 

AR tweeter twice bigger with bigger magnet
for compare:

Found only several options on ebay for original sizes new tweeter for ar-3a with paper cone

this one  (that looks more easy for future repair if needs) https://www.ebay.com/itm/152673689795
or this one that looks more like the original https://www.ebay.com/itm/162689998131

can someone recommend one of them?

 

[Need tips how to repair ar-3a tweeter coil]

after attempt to restore the tweeters 

The attempt to fix looked like that (used silicone and some useless gloe)

ends with too much glue that stock the tweeter and I burned the coil, 

 

Now I have only the  paper capes that I fixed, and the magnet

 

Need any suggestion how to restore the coil, how to fix the cap to the magnet, which material and what the right distance for the coil (the magnet form is unusual with 3 holes and the middle part lower then usual magnet by several mm).
which coil to use and how to apply it?
also, how to fix the wires on tweeter/ midrange to the top on the driver (as the newer versions of this driver)?

 

Thanks for any suggestions.

[Can I make quadro (connect in serial) ar-3a(improved) with ar-11]

I have pair of ar-3a,
I found a good offer for ar-11,
can I pair this both speakers/ connect them in serial / make quadro ?