Mark Fenlon's New CHP-70 (note the "P") - diyAudio
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Old 8th October 2009, 10:16 AM   #1
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Default Mark Fenlon's New CHP-70 (note the "P")

Hi Guys,
Here's my all new CHP-70 driver. Note the all custom colour and tone matching. It's only available in Japan at this time. Maybe going to Germany soon.

Paper cone unit, centre bonded cap. Paper is made in Japan, forming done in Taiwan. As per my custom, it's 100% custom built.

Revc = 3.6 Ohm
Fo = 66Hz
Sd = 50 Cm/2
Vas = 5.0 Litres
Cms = 1.394N/M
Mmd = 4.0g
Mms = 4.2g
Bl = 2.99 T/M
Qms = 3.114
Qes = 0.701
Qts = 0.572
Levc = 0.043 mH
No = 0.195%
Pwr = 18 W
Pwr Max = 36 W
Cone Dia = 71-mm
Attached Images
File Type: jpg CHP70_small2.jpg (41.8 KB, 2268 views)
File Type: jpg CHP70_Frequency.jpg (101.1 KB, 2140 views)
File Type: jpg CHP70_impedance.jpg (289.2 KB, 2052 views)
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Old 8th October 2009, 10:30 AM   #2
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Ha! Look at that extension. I'm seeing a driver that's flat to 15KHz, gentle roll-off of the extreme top to keep things nice & smooth sounding & a -12dB point at about 25KHz. I love the FR that's engineered into these units -subtle lift to counter step loss, slight dip in the sibilence zone lifting up a touch more to inject some presence, & ~ flat until that final slow descent. I bet the Japanese go ape over these things; it's exactly the sort of thing they like.
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Last edited by Scottmoose; 8th October 2009 at 10:36 AM.
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Old 8th October 2009, 10:38 AM   #3
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I have a craving for white chocolate right now

Very stylin' ... I think a visit to Bob is in order for a listen.

Cheers!
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Old 8th October 2009, 10:44 AM   #4
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Hi Scott,
Arrrrrr....... So you've seen my cunning plan (et al. Black Adder).
Correct, and from what Norio San tells me, I may be busy boy in the factory.

Hi Gregg, sure, give Bob a call.
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Old 12th November 2009, 02:16 PM   #5
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CHP-70 in a beautiful boxes - source is Linfof site in Japan

http://masahi.cool.ne.jp/linfofbbs/j...ickup&num=6196

Mark.
Attached Images
File Type: jpg CHP70_6496.jpg (295.7 KB, 1904 views)
File Type: jpg CHP70_6473.jpg (194.9 KB, 1833 views)
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Old 12th November 2009, 06:50 PM   #6
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I like white

dave
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Old 12th November 2009, 07:32 PM   #7
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Nothin' like a dovetail to make things really look sharp!

Pete
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Old 12th November 2009, 09:45 PM   #8
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Hi Peter,
Long time, hope you're well and enjoying OB.
Yep, a round of applause to the Japan guys, they do some fab work. I wish I had their wood-work skills.

Mark.
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Old 13th November 2009, 12:20 PM   #9
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Hi Mark; Yeah I'm still here after a nasty bout with the Flu! Still enjoying my Alpair 10/ Alpha 15 "H" baffle combo--hard to beat IMHO! Might be fun to try the "12's" with the Goldwood "18" ----maybe I can even work some dovetails into an OB!
Glad your products are doing well.

Pete
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Old 6th January 2010, 01:32 PM   #10
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The beautiful CHP-70 drivers match oakwood cabinets.

Click the image to open in full size.

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