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Old 8th October 2021, 07:10 PM   #31
MGCRead is offline MGCRead  United Kingdom
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Thanks ( I think ). I didn't really understand your reply. I take it the design for the CGR ( is that the shape of the box? I will have to swot up on topology ) is commercially protected?


The centre speaker design you posted has an internal volume of about 14 litres which is a bit less than the 16 litres I calculated for the FF165WK.
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Old 8th October 2021, 07:22 PM   #32
planet10 is offline planet10  Canada
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:^)

A Classic Golden Ratio box is one with dimensions really close to 1.618:1:(1/1.618), 1.618 being th efirst digits of the Golden Ratio.

All of the miniOnken designs use an alignment developed by us and typically a driver will have boxes doen for trapezoidal (8 sided in the end), the rectangular full-on miniOnkens with the slot vents down the side as in a traditional Onken, the CGR, often a centre, and if the box is large enuff, a Compact FloorStander (CFS), if small enuff a millSize box.and often other shapes to meet the needs of users.

The CGR (small one in the case of FF165) is typically free for use, the cente if the driver is also used in a Frugel-Horn. Full plansets are typically $25 USD.

The small box is 13 litres, the large one 17 litres. The larger one is the optimim size for the miniOnken alignment, goes a bit deeper with a less contrained bottom end. It wuld be easy enuff to take, for instance Dr. Scott’s Woden box for A10.3/p and adjust the vent (and mounting details).

http://wodendesign.com/downloads/sim...lan-100214.pdf

The trapezoid is hardest to build, the rectangular one next, the CGR/CFS/centre the easiest. The effort to build the harder boxes does bring sonic benefits — a lower diffraction signature, making it easie rfor the box to “disappear”. Th emost popular drivers tend to have the larger plansets (the Alpair 10 family planset is over 50 pages now).

planet10-hifi miniOnken Plan-Set Subscriptions

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Old 9th October 2021, 09:47 AM   #33
MGCRead is offline MGCRead  United Kingdom
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Thanks Dave

can I conclude that either the FF165WK or SEAS320 would be a good choice for your trapezoid box? And both are within my budget. I have no experience of either driver so am happy to accept advice from those who have.

Alpair drivers don't seem to be readily available in the UK ( and since Brexit it is likely there would be heavy import expenses if I bought from the EU ).

Having decided which drivers to go for how do I actually purchase your plans ?

As it is a attractive design I would build them from a nice hardwood, haven't decided which. I have a good stock of pear but perhaps that lacks enough figure. Probably settle for olive as I have a fair amount of that.

I don't want large speakers as our living room is already dominated by the TL12s.

Thanks Malcolm
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Old 9th October 2021, 03:57 PM   #34
jan.didden is offline jan.didden  Europe
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Just talked to the Arpeggio designer, Morgan Jones. His take:

Good news for your Arpeggio enquirer. I looked up the Thiele-Small parameters for the FE166NV and expected to need to reduce cabinet volume because of the reduced VAS. However, the BL factor has also fallen, and it turns out that the two cancel one another out and the required volume is exactly the same as before. He'll have to experiment to get the Zobel network right, but other than that, the FE166NV (non-vintage?) is a drop-in replacement and should work just fine.

Jan
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Old 9th October 2021, 04:39 PM   #35
planet10 is offline planet10  Canada
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Quote:
Originally Posted by MGCRead View Post
can I conclude that either the FF165WK or SEAS320 would be a good choice for your trapezoid box?[/sub]
SEAS FA22? I like it in a sealed bo.

Quote:
Alpair drivers don't seem to be readily available in the UK
Other than Japan, probably the best stocked distribution outside of Japan is in Kent.

Markaudio | KJF Audio

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Old 9th October 2021, 04:45 PM   #36
GM is offline GM  United States
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Quote:
Originally Posted by cobar53 View Post
Has anyone experience with using this driver?
If so may I seek advice on the Zobel values?
I seem to have arrived at RZ = 6.8 ohms and C2 at 1.35uF but that does not seem correct.
Not me, but assuming the published [or someone's measured] impedance is ~typical, then: Zobel Calcs making me crazy!
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Old 9th October 2021, 04:58 PM   #37
MGCRead is offline MGCRead  United Kingdom
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Thank you very much Jan for taking the trouble to research the choice of Fostex drive units. And thank you to Mr Jones ( whose Valve Amplifiers book I have just finished reading - quite a challenge, but extremely helpful ), for doing the calculations. I have emailed Wilmslow Audio ( the only UK supplier of Fostex I can find ) to see if they have them in stock.


And thank you Dave for the pointer to Markaudio who I didn't find in my web search. An interesting site. So plenty of choices if I choose the trapezoidal cabinets. I still can't work out how to purchase the plans. Btw do the vents have to be on the front side panels? I don't think they are aesthetically pleasing - sorry!


Again many thanks for all your help, Malcolm
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Old 9th October 2021, 06:02 PM   #38
planet10 is offline planet10  Canada
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If you want a paid planset, email me.

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