Castle Microtower build - diyAudio
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Old 21st April 2011, 03:08 AM   #1
zman01 is offline zman01  Bangladesh
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Default Castle Microtower build

Micro Towers - I can't exactly remember which one I came across first - the plans on Planet 10 website http://homepage.mac.com/tlinespeaker...aps-150909.pdf, or this thread by Dave: microTower bipolar ML-TL for CHR-70 or EL70. Either way, I loved the intro... a bit of nostalgia, a bit of reviving a joy of the past... and the build looked simple, the finished speakers cute. Compact dimesions = (usually) Higher WAF , especially given that my first FR build was the BIB (pretty massive); then the plan was to build a Pensil 12 which became a Super Pensil 12 (pretty massive too).

I was also looking for speakers which could produce good bass and became very excited about FAST. After discussing FAST with Dave I had initially planned to order a pair of Alp 7 or CHR70.2En from Dave as FAST FR units. Dave's CHR70.2Ens were on sale at that time, so just decided to pick up 2 pairs... a pair for FAST and a pair for other experiments.

And then it hit me - why don't I do a Micro Tower build? According to Dave and ChrisB the MTs give plenty of bass... also the MT dimensions looked a perfect fit to me for using my left over pieces of ply board.

And so it was decided - let's go and build this! The picture below is not my buidl, but a concept build by Dave and Chrisb taken from the plans. If you take look at the illustration (taken from P10 plans), you will see how compact the speakers are (and the variations that can be made).

-Zia
Attached Images
File Type: jpg P10 MT concept build.jpg (60.6 KB, 678 views)
File Type: jpg P10 MT illustration.jpg (71.1 KB, 505 views)
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Old 21st April 2011, 03:16 AM   #2
zman01 is offline zman01  Bangladesh
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Default Drivers

The drivers for this project are Planet 10 modified CHR70 MK2.

Very happy with shipping and service from Planet 10, thanks Dave.

I have 40 hours of break in done for all the drivers. Will get some more before sounding off big time with the Micro Towers...
Attached Images
File Type: jpg P10 CHR70.2En.jpg (72.6 KB, 507 views)
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Old 21st April 2011, 03:27 AM   #3
zman01 is offline zman01  Bangladesh
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Default Many flavors, which one to choose?

If you go through the MT plans, you'll see that there are a good number of variants.

For me the "castle" or sloped design caught my eye... I liked the aesthetic. Initially I was thinking of doing the 45 degree incline build, finally went for the 15 degrees. The attached image is an illustration from the Planet 10 MT plans file showing the standard MT and the 45 degree inclined top model.

Regarding WAF, my wife liked the design the first time I showed it to her and voted for the "castle" look. Good, more power to the towers!
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File Type: jpg MT castle and standard variants.jpg (47.4 KB, 501 views)
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Old 21st April 2011, 03:30 AM   #4
zman01 is offline zman01  Bangladesh
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Default Cutting the pieces for teh build

I used 18mm ply, the plans on the site are for 15 mm ply board.

I kept the internal dimensions same as the original and cut the pieces accordingly.

Again there are some holey braces and more to that on the next post.
Attached Images
File Type: jpg Castle MT pieces 03.jpg (64.0 KB, 508 views)
File Type: jpg Castle MT pieces 02.jpg (72.4 KB, 185 views)
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Old 21st April 2011, 03:35 AM   #5
zman01 is offline zman01  Bangladesh
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Default Braces for the Castel Microtower

Adapted Dave's holey brace design for this build.

Since I do not have clamps, the books came in handy while gueing the two pieces together.
Attached Images
File Type: jpg Catsle MT holey braces 01.jpg (101.5 KB, 109 views)
File Type: jpg Catsle MT holey braces 02.jpg (88.7 KB, 94 views)
File Type: jpg Holey braces and the power of the press.jpg (113.1 KB, 89 views)
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Old 21st April 2011, 03:43 AM   #6
zman01 is offline zman01  Bangladesh
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Default Damping

At first I had assumed that damping would be like BIB or Pensil 12, where there removable panels at the front or back to adust damping level to room need and personal preference. Then I realized that the MTs do not have a removable panel option in the original design.

Going through the plans again, I discovered that acosutic fibre glass wool is recommended. After asking at the forum I learnt that poly batting will also work.

It took me aday to track down some 1" thick poly batting. Fixed this with glue to the insides of the back and both sides.
Attached Images
File Type: jpg Polyester batting.jpg (49.4 KB, 93 views)
File Type: jpg Castle MT poly batting inside on sides.jpg (79.8 KB, 94 views)
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Old 21st April 2011, 03:57 AM   #7
zman01 is offline zman01  Bangladesh
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Default Putting the parts together

Finished cutting the pieces, making the braces, cutting the driver holes, and finaly fixing the damping material - so time to put the cabs together.

Have one side and the top open as of now.
Attached Images
File Type: jpg Castle MT glued up without side.jpg (51.8 KB, 119 views)
File Type: jpg Castel MT front and side view.jpg (59.8 KB, 232 views)
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Old 21st April 2011, 03:58 AM   #8
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You'll need more damping than that, it will be similar to the pensils

dave
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Old 21st April 2011, 04:13 AM   #9
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Wow you built these up quick! This'll be cool to hear how you feel about these vs. the SuperPensil's you're building.

Scott
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Old 21st April 2011, 04:38 AM   #10
zman01 is offline zman01  Bangladesh
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Quote:
Originally Posted by planet10 View Post
You'll need more damping than that, it will be similar to the pensils

dave
Dave, thanks for pointing this out.

This is the 1" thick poly batting lining. I have more with me. So basically I should have the fuff placed from under the drivers all the way to the base?

-Zia
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