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Old 3rd September 2019, 02:45 AM   #1
jdrouin is offline jdrouin  United States
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Default Lowther PM6A xFonken?

Would the Lowther PM6A, 15 ohm silver (Qts .381), be a candidate for a trapezoidal Onken style enclosure?
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Old 5th September 2019, 07:32 PM   #2
planet10 is offline planet10  Canada
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Lowther PM6A xFonken?
I am surprised, but yes, given those numbers it will get in the high 50s F6/low 50s F10 in 35 litres — i already have a 35 litre trapezoid for the A12pw & FF225wk that could be adapted.

It won’t deal with the rising on axis response, but Martin’s measures suggest that flattens out off axis.

dave

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Old 5th September 2019, 08:02 PM   #3
jdrouin is offline jdrouin  United States
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Thanks. Interesting. I would've thought a driver that large would go lower.

I made a pair of Martin King MLTLs for someone else's Lowther DX4 back in May, and was so impressed with the build quality of those drivers that it made me curious to hear them (haven't gotten the chance yet). And I've loved the Alnico drivers I've heard in vintage systems, so PM6A seems like a natural choice (plus its frequency response is the flattest of the entire product range).
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Old 5th September 2019, 08:08 PM   #4
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Lowther PM6A xFonken?
Quote:
Originally Posted by jdrouin View Post
Thanks. Interesting. I would've thought a driver that large would go lower.
There are so many variables besides size it iis almost immaterial. The FE206eN in the sam e kind of alignment doesn’t make 100 Hz.

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Old 5th September 2019, 08:36 PM   #5
jdrouin is offline jdrouin  United States
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Quote:
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There are so many variables besides size it iis almost immaterial. The FE206eN in the sam e kind of alignment doesn’t make 100 Hz.

dave

Interesting. Would something like a Pensil enclosure or MLTL allow PM6A to go lower than a trapezoidal Onken?
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Old 6th September 2019, 12:11 AM   #6
planet10 is offline planet10  Canada
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Lowther PM6A xFonken?
It might. Scott doesthe TLs.

dave
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Old 9th July 2020, 08:55 PM   #7
jdrouin is offline jdrouin  United States
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I wasn't able to post in the Planet 10 picture gallery, so here are the trapezoidal Onkens for Lowther PM6A. Special thanks to David for the bespoke design. I've only listened for a couple hours but they sound superb.

18mm Baltic Birch plywood with solid red oak vent spacers. Finish is 12 coats of amber shellac and a top coat blend of orange oil, beeswax, and carnauba wax.

Also pictured are mFonkens for Fostex FE103Sol and MarkAudio Alpair 10P.

Some thumbnails appear sideways but are corrected when you click to view the larger version.

Those interested in more pics as well as thoughts on build process and creativity can follow me at Instagram: @boisetverre.
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Old 9th July 2020, 09:07 PM   #8
planet10 is offline planet10  Canada
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Lowther PM6A xFonken?
Jeff,

Thanx for the email with the pictures, these are gorgeous.

With positive initial comments i am eager to hear what you think of the sonics as they break in. Enclosures for Lowthers that are not big horns are rare and hopefully this design challenges that notion.

Since there is only one, it is called a Low-Ken or Low-KenPM6T, if more follow it may well get a longer designation.

dave

PS: there are 2 gallery threads in the P10hifi forum, one stickied where only i can transfer posts that just have pictures and a longer one with comments below.


miniOnken/Fonken Picture Gallery

I have copies your post from the FR gallery to those 2 threads.
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Old 9th July 2020, 09:19 PM   #9
jdrouin is offline jdrouin  United States
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Thanks! I will definitely report on the break-in process as noticeable changes occur, with a thorough review at some point. I'll say right now that these by far present the most "air" or "sparkle" (or other audiobabble synonym) of any speaker I've heard. Also percussion -- the hi-hat and cymbal in bebop: Wow! Otherwise they're just so musical and involving, with microdetail that's almost kinda scary.

Timbre of acoustic instruments and jazz guitar is gorgeous.

Also they handle complex passages remarkably well.

These will become a family heirloom.
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Old 9th July 2020, 09:30 PM   #10
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Lowther PM6A xFonken?
Of particulae interest is the bass capabilities?

dave
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