Hello Troels,
Here another response from John Eekels from Holland.
First of all I want to thank you for youre great
project on the Super-Mini-Monitor! Ive built this
design recently. All pics and comments (In Dutch) here: Nieuwe pagina 1. I must say, you
did a great job on this! The overall balance and sound
stage are amazingly well balanced. On my SE 300B tube
amp, they sound impressive, even though this is not a HES
speaker
Now I started a new project from
youre site, I have some questions on you. I build a
pair of mini cabinets from scratch wood,
(cherry,wood etc.) on youre W11XT design. Instead
of using a wooden port on the back side of the cabinets,
I want to use a PVC pipe. When i calculate the air mass
of youre design i come to: 1,2 x 17,9 x 11,4 = 245
cm3 of air volume. When I want to use a pipe, is it
correct to use the math formule:¼ x 3,14 x D2 x L to
calculate the equivalent of a similar pipe volume to the
rectangular wooden pipe? Thus:245 = 0,785 x D2 X L. Lets
say I will use a ID pipe dimension of 40mm L will be
245/16 makes appr.15,3 cm???? And one other question: Can
you tell me where I can buy the SEAS W11CY001 units? They
are obsolete I think
. Thank you for youre
great DIY site, and sharing your designs with us. Regards
John Eekels
Hi John,
Thanks for your mail and response to the W15/OWI
construction. I'm pleased you like them - - and I can't
believe how beautiful they are!
I still have some hard wood on the shelf for the final
cabs. Some day....
Unfortunately the W11CY001 drivers are no longer
available. I've tried modelling the W12CY001 + OWI and it
looks promising. Maybe it's time to replace the
the W11 with a new construction. There really isn't any
substitute for the W11CY001, having a lightly coated
paper cone.
Port dimensions (same length):
The W11 port area is 12 x 114 mm = 13.68 cm^2. A tube
will have a radius of (13.68/pi/3.14) = 2.1 cm for the
same area.
The actual port tuning of the W11 is close to 56 Hz,
somewhat lower than the intended 65 Hz. I guess I was
expecting the Fs to lower at bit over time. A 40 mm (ID)
vent should be 16 cm long to keep current port tuning. I
would possibly try 12 cm to get port tuning up to 65 Hz.
Best regards, Troels
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