"Upgrading" OA-14 towards OA-116 !?

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jldelta
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"Upgrading" OA-14 towards OA-116 !?

Post by jldelta » Thu 27 Jul 2017, 09:46

Good morning, Sweden, from a British expat living near Amsterdam.

I already have OD-11 + OA-12 and the possibility of buying a cosmetically rather scruffy pair of OA-14.

My interest in restoring the OA-14 is to upgrade the bass performance by adding a woofer, most likely connected directly, ie. not via the crossover (I have an interesting pair of Acoustic Research Holographic Imaging M4 speakers that have an upward firing bass speaker run without crossover - it works very well in that speaker).

My question is simply : has anyone already done this, as it seems like an obvious thing to do ? There appear to be two alternatives, (a) find a suitable 6,5" driver and mount in the base, firing downwards in a similar way to the OA-116 (although a tighter fit), or (b) use a larger woofer mounted in one side (Boenicke-style http://boenicke-audio.ch/w11_c/). Whilst option b might present greater challenges to fit, as it would affect the cabinet bracing, it would give options in firing the bass units towards each other or apart, which apparently gives posibilities for cancelling bass nodes in the room (if that is the correct terminology).

Apologies for writing in English : I have been reading a lot here using Google Translate, which has improved greatly in recent years !

momus
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Re: "Upgrading" OA-14 towards OA-116 !?

Post by momus » Thu 27 Jul 2017, 11:58

Please check Carlssonkult.se and let google translate.

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Re: "Upgrading" OA-14 towards OA-116 !?

Post by jldelta » Thu 27 Jul 2017, 14:24

momus wrote:Please check Carlssonkult.se and let google translate.
Thanks for the link : I had already seen the reference to using the Satori driver in place of the SC165 for the OA-14.

Or did you mean the suggestion for improving the bass performance of the OA-116, using the SEAS unit ? This does at least show me that if I choose to fit a downward-firing 6,5" woofer, I should fabricate an entirely new bottom board.

... but I have still not dismissed the idea of a larger, perhaps 10", side-firing woofer (perhaps this will be too difficult in practise, but I wlll have to open up an OA-14 first).

And, of course, perhaps a pair of sub-woofers, passive or powered, is a much simpler - & maybe superior - solution ! In fact, if I choose the sub-woofer route, I could simply keep the OA-12 in service & forget about the OA-14... I have a JBL Digital 10, probably not too difficult to find another.

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Re: "Upgrading" OA-14 towards OA-116 !?

Post by momus » Thu 27 Jul 2017, 23:54

Your last suggestion is maybe the best. I use a XTZ subwoofer with my two OA 12´s, and I am very satisfied. Although bass is a bit different with vinyl compared to CD and Bluetooth. I sometimes have to adjust the bass (maybe my Cambridge 540p RIAA is a bit bass light). The amplifier is a NAD D 3020.

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Re: "Upgrading" OA-14 towards OA-116 !?

Post by jldelta » Fri 28 Jul 2017, 09:25

Yes, I think the first step should be to acquire another JBL Digital 10 sub - they come up from time to time at little cost - & I have always wanted to see if the advantages of two subs are really so much greater than one.

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Re: "Upgrading" OA-14 towards OA-116 !?

Post by momus » Sat 29 Jul 2017, 12:34

Two shouldn't´t be better than one. The low frequencies doesn't´t allow us humans to decide where the bass come from. I have my subwoofer (only one) to the left of my speakers. I can´t hear where the bass come from. I think it is a question of placebo.

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Re: "Upgrading" OA-14 towards OA-116 !?

Post by momus » Sat 29 Jul 2017, 12:36

When you listen to vinyl, all bass under 200 Hz is in mono.

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Re: "Upgrading" OA-14 towards OA-116 !?

Post by momus » Sat 29 Jul 2017, 12:41

I reckon you use OA 12´s as your "standard" listening. I always found the OA 14 a worse speaker than the OA !2. I have been living with the OA14`s for at least two decades and with the OA 12`s for 5 years.

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Re: "Upgrading" OA-14 towards OA-116 !?

Post by jldelta » Sun 06 Aug 2017, 19:07

I am indeed interested to see how the OA-14, which I bought a few days ago in Germany en route for the Swiss Alps, compare with the OA-12. My living room is quite large & with subs to "pressurise" the room, the extra volume of the OA-14 may not be necessary or an improvement. By the way, the alleged advantages of having two subs are not connected with stereo directionality, but more about cancelling room nodes (lots of info on the 'net).

There's going to be a delay in reporting further, however, as the turbo on my BMW X3 disintegrated on Friday, so I am not yet sure when - nor how - I will be returning home (Klosters is nevertheless a very beautiful place to get stranded... ) !

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Re: "Upgrading" OA-14 towards OA-116 !?

Post by momus » Mon 07 Aug 2017, 10:42

Sorry ´bout the turbo. Well you will get the "airy" sound with the OA-14`s, but they will not necessererly sound better than a pair of OA 12´s. When I had the OA 14´s, the bas was good - in the kitchen. The room adjacent to the living room (where the stereo resides).
OK. two subs for cancelling room modes. I don´t know anything about that.

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