AR-3a Improved

[mike tarelli]

Since wiring the mids on my AR-3a improved correctly I have noticed more detail. Unfortunately the sound is coarser. If I use the switch it mellows a little but reduces the tweeter output as it is a DPDT switch. The very similar AR -11 has separate and greater control in this area. If I reverse the polarity on the mids again does it merely make them quieter allowing me to switch the tweeter back up? Is it that simple or am I losing something ? Thanks. Mike.

[KlausDK]

Since wiring the mids on my AR-3a improved correctly I have noticed more detail. Unfortunately the sound is coarser. If I use the switch it mellows a little but reduces the tweeter output as it is a DPDT switch. The very similar AR -11 has separate and greater control in this area. If I reverse the polarity on the mids again does it merely make them quieter allowing me to switch the tweeter back up? Is it that simple or am I losing something ? Thanks. Mike.

Hi Mike

Have you studied the crossover?

http://www.classicspeakerpages.net/IP.Boar...-1204644282.jpg

Reversing the polarity on the mids does not make the quieter but - reverses the polarity. If you want independant adjustment, you could make a seperate switch for the mid or even better leave the switch in high posistion and install an increased resistance in front of the midrange to your liking (the 1 Ohm on the schematic).

BRgds Klaus

[mike tarelli]

Hi Mike

Have you studied the crossover?

http://www.classicspeakerpages.net/IP.Boar...-1204644282.jpg

Reversing the polarity on the mids does not make the quieter but - reverses the polarity. If you want independant adjustment, you could make a seperate switch for the mid or even better leave the switch in high posistion and install an increased resistance in front of the midrange to your liking (the 1 Ohm on the schematic).

BRgds Klaus

Hi Klaus

Yes the schematic was how I realised the mids were incorrectly wired and had been for years! Correcting this seemed to

increase their output but harden the sound. My units are rear wired so I assume I would wire the resistor(would that be

10 ohm? ) in series on the green ( plus ) lead? What worries me is that I don't ever remember 3a improveds ever sounding

harsh and my hearing was much younger! Thanks for answering.Mike.

[KlausDK]

My units are rear wired so I assume I would wire the resistor(would that be

10 ohm? ) in series on the green ( plus ) lead?

Hi Mike

I would try increasing the Rz maybe to 2 or 3 Ohm, I would not place it on the green wire, that would interfere with the cross over frequencies.

BRgds Klaus

[mike tarelli]

Hi Mike

I would try increasing the Rz maybe to 2 or 3 Ohm, I would not place it on the green wire, that would interfere with the cross over frequencies.

BRgds Klaus

Hi Klaus

Ah that resistor R2 ! I was looking at R3! Sorry out of my depth here. I'm afraid I don't know how to do that or even where it is. Mike.

[KlausDK]

Hi Mike

Sorry, you're right R2 not Rz. My set of AR3 Improved sounds absolutely magnificient, in fact those are the speakers I listen to the most.

May be it is time to think about replacing the caps?

The R2 resistor is here (in the red circle):

BRgds Klaus

[mike tarelli]

Hi Mike

Sorry, you're right R2 not Rz. My set of AR3 Improved sounds absolutely magnificient, in fact those are the speakers I listen to the most.

May be it is time to think about replacing the caps?

The R2 resistor is here (in the red circle):

BRgds Klaus

Hi Klaus

Thanks that makes it very clear. I expect you're right about the caps though that does seem daunting. I agree about the improveds . When the shops were full of ARs they were always my favourites. Thanks again for your time and help. Mike.