Sonab OA-12 upgrade

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JoelRiehl
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Sonab OA-12 upgrade

Post by JoelRiehl »

I am about to undertake another OA-12 upgrade project; this time using the Satori mid-woofer, Obi T22 tweeters, and filter by grafpro. Parts are ordered.

I was visiting #2 son in Montana a couple weeks ago. He has the pair I upgraded 6 years ago, with Carlsson B65 drivers. Paired with the old Pioneer SX-750 receiver I gave him (which I had since new in 1976), it remains one of the sweetest sounding combinations I have ever heard - so I am excited to hear what the Satori upgrade will do! It took me a long time to get around to it.
JoelRiehl
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Re: Sonab OA-12 upgrade

Post by JoelRiehl »

Parts have arrived, and ready to go. I have a question right off:
1. The Satori driver has 6 screw holes around a thick cast rim instead of the turned up steel rim of the original drivers, which accepts 4 retainer clips. How do you mount the Satori drivers? Do you clamp the rim with the 4 original retainer clips, or do you drill and screw using the 6 screw holes in the Satori driver?

Appreciate any guidance. I'm sure I will have more questions as I go along.
JoelRiehl
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Re: Sonab OA-12 upgrade

Post by JoelRiehl »

Parts have arrived, and ready to go. I have a question right off:
1. The Satori driver has 6 screw holes around a thick cast rim instead of the turned up steel rim of the original drivers, which accepts 4 retainer clips. How do you mount the Satori drivers? Do you clamp the rim with the 4 original retainer clips, or do you drill and screw using the 6 screw holes in the Satori driver?

Appreciate any guidance. If anybody has photos that'd be great too. I'm sure I will have more questions as I go along.
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STDI!
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Re: Sonab OA-12 upgrade

Post by STDI! »

I have used the original retainer clips but without the rubber pieces. This way there are no extra holes drilled.
20210720_120446_1626782763523_resized.jpg
OD-11(T22+B65OAII), 3xOA12(T22+B65OAII), OA52.N, 3xL8, SC6, SC6.2
JoelRiehl
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Re: Sonab OA-12 upgrade

Post by JoelRiehl »

STDI! Thank you! That's how I was hoping it would work. Wasn't looking forward to drilling a bunch of holes in my immaculate old speakers.
JoelRiehl
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Re: Sonab OA-12 upgrade

Post by JoelRiehl »

Just reporting in that the upgrade is complete, and I am delighted with how they sound!
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STDI!
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Re: Sonab OA-12 upgrade

Post by STDI! »

Great.
OD-11(T22+B65OAII), 3xOA12(T22+B65OAII), OA52.N, 3xL8, SC6, SC6.2
momus
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Re: Sonab OA-12 upgrade

Post by momus »

What do you drive your upgraded OA 12 with?
JoelRiehl
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Re: Sonab OA-12 upgrade

Post by JoelRiehl »

Hi Momus! Sorry for the delayed reply. I haven't been on for a while. I was previously running them with a Dynaco ST-80 and Dynaco PAS-4, both mid-'90s vintage. I currently have them upstairs with a newer Rogue Audio Cronus Magnum ii (KT-120 tubes - 100WPC). On that system (Denon CD player) they KILL Shirley Horn's "Here's to Life", and are really happy with classical music like Yo Yo Ma, or Brandford Marsallis "Romances for Saxaphone", or Ralph Towner / Oregon (the latter, Oregon's "Winter Light" is what I fell in love with Sonab on back in the 70s.)

You had mentioned that you were running yours with a tube amp - was it Dynaco .....?


Cheers,

Joel
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