Sonab oa-12 crossover

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quadmatrix82
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Sonab oa-12 crossover

Post by quadmatrix82 » Wed 21 Sep 2016, 09:13

Hi all sonab experts I'm currently restoring a pair of sonab oa-12 and to my surprise I've noticed a different crossover fitted. I'm certain these are original and never tampered with no evidence of anyone soldering or removing them before me. There is no 10uf capacitor just a 5.6uf has anyone come across this before? There's two coils and two resistors I'm curious if sonab changed the design throughout the sonab oa-12 lifecycle??? I've had about six pairs of oa-12 and this is the first time I've seen this. Welcome anyone experience here!
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Martin Dellstig
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Re: Sonab oa-12 crossover

Post by Martin Dellstig » Thu 22 Sep 2016, 17:31

Hello
At first for a brief period there was a filter that was asymmetric.
That filter was in production for only a brief time.
I world rekommenderar to uppgrade the filter to the newer version.
Best regards
Martin
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quadmatrix82
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Re: Sonab oa-12 crossover

Post by quadmatrix82 » Thu 22 Sep 2016, 22:45

Thankyou! Do you know if the coils are the same? They aren't labelled

Martin Dellstig
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Re: Sonab oa-12 crossover

Post by Martin Dellstig » Sun 25 Sep 2016, 23:43

Hello
Sorry to say I don't remember, I'll look and see if I have the info somewhere.
Best regards
Martin
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quadmatrix82
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Re: Sonab oa-12 crossover

Post by quadmatrix82 » Mon 26 Sep 2016, 01:21

Ok Thankyou!

Martin Dellstig
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Re: Sonab oa-12 crossover

Post by Martin Dellstig » Thu 06 Oct 2016, 16:52

Hi
I have finally found my scribbled notes on the old crossover!
Woofer: Coil 0.64 mH.
Tweeters: Capacitor 5,6uF and Coil 0,54 mH, drivers connected in reverse polarity. Reistors both 2,2 Ohms.

I hope this helps

Best regards

Martin
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sadkia
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Re: Sonab oa-12 crossover

Post by sadkia » Sat 01 Dec 2018, 10:52

Installed rubber c-strip to top grilles and now there is room for new tweeters under grille. Been listening speakers now some time and these sounds just great for livingroom use. Mostly I use these for radio and tv, but also sometimes for movies and music since my theater/music room is still under construction.

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