Summer Project - Replication of MBL loudspeaker 101mkII - diyAudio
Go Back   Home > Forums > Loudspeakers > Planars & Exotics

Planars & Exotics ESL's, planars, and alternative technologies

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 21st September 2012, 09:59 PM   #1
diyAudio Member
 
Magnasanti's Avatar
 
Join Date: May 2012
Location: Georgia
Send a message via Skype™ to Magnasanti
Default Summer Project - Replication of MBL loudspeaker 101mkII

I have a good 2 months out of school and i decided to build a replication of the loudspeakers MBL 101 mkII. The monetary resources to build a clone at least parts of it are taken care of . The following are the complete information of construction regarding the MBL 101 mkII. This project is inspired by this thread My MBL 101E replicas

DELAYED
The Tweeter :
Number Of Petals - 24
Lamella Material - Uni-Directional Carbon Fiber
Lamella - 24mm x Unknown
Lamella Bending Radius - 25mm
Lamella Type - Non-Stitched Epoxy Bonded
Lamella Resin - MGS System 285 (H287S MGS HARDENER SLOW)
Lamella - Bake Temperature And Pressure Unknown
Lamella Prepeg ratio - 54% Carbon Fiber 46% Epoxy Resin
Lamella Glue - unknown
Dampening - Polyester Fiber
(Twaron Angel hair)
Top Cap - W x 44.45mm
Top Cap Hole Diameter - Unknown
Mid Support Rod - W x L Unknown
Voice coil - Diameter 37mm ( 3.7cm )

Voice coil/Former - 4n Copper Wiring Used
Voice coil/Former - Aluminum Former Used
Voice coil/Former- Glue used is car break glue ''burned in at 500 Fahrenheit''
Voice coil/Former - Floats In Ferrofluid
Top Plate Diameter - 120.40mm
Bottom Plate Diameter - Unknown
Magnetic Material - Neodymium
Magnet size - 70mm ( 7cm )
Tweeter


Additional Known Driver Info

The outside of the lamellas are coated with a thin anti resonance film. The inside of the circular lamella configuration is filled with sound absorbing fibers witch have been confirmed to be of polyester origin.




IN-PROGRESS
The Mid-Range :
Number of petals - 12
Lamella material - Cross-Woven Carbon-Fiber
Lamella Tow - 1K
Lamella Type - Spread tow ( PrimeTex ZB )
Lamella cut - Bias
Lamella - 12.5mm x 1 sheet x 62mm
Lamella Bending Radius - 55mm
Lamella Resin - MGS System 285 (H287S MGS HARDENER SLOW)
Lamella - Bake Temperature 176F And Pressure 200psi
Lamella Prepeg Ratio - 54% Carbon Fiber 46% Epoxy Resin
Lamella Glue - Silicon Rubber Glue (Wacker)
Dampening - Polyester Fiber (Twaron Angel Hair)
Inner Ring- 40mm x 12.5mm
Inner-Ring Material - AL-MG ( Aluminum/Magnesium)
Inner-Ring Hole Diameter -
13mm
Outer-Ring - 90 x 12.5mm
Outer-Ring Material - AL-MG ( Aluminum/Magnesium)
Outer ring Hole diameter -
9.525mm ( 3/8" )
Inner-Hollow pass through -Rod - (OD)13mm x 5"
Inner-Hollow pass through -Rod (ID) 6.25mm
Inner-Hollow pass through -Rod Material - Graphite
Outer-Steel Support-Rod - 9.525mm ( 3/8" ) x 60mm ( 6cm )
Outer-Support-Rod Material - Super-Refined Steel
Voice coil Diameter - 5cm ( 50mm )
Voice coil/Former - 4n copper wiring used
Voice coil/Former - Kapton former used
Voice coil/Former- Glue used is car break glue ''burned in at 500 Fahrenheit''
Voice coil/Former - Floats In Ferro-Fluid
Top Plate Diameter - Unknown
Bottom Plate Diameter - Unknown
Magnet material - Neodymium
Magnet size - 12cm ( 120mm )
Mid-Range


Additional Known Driver Info


The thrust bearing is a single side coated with a heavy tar plate to reduce resonance. The inside of the lamella group is coated with a special rubber material, and thin anti resonance film is also applied to the lamellas. The four rods are super refined steel. Both ends of the lamellas are glued using the silicon rubber glue, all the lamellas are glue together with a bead. polyester fiber fills the inside, and is sealed off by a rubber material.




Delayed
The Melon :
Number of petals - 12
Lamella material - an alloy of Aluminum,magnesium,and silicon
Alloy ratio - Unknown
Lamella - Raw 50mm widest point x 20mm at end points x D x 360mm
Lamella - Assembled 10in x D x 16.5in with a lamella end of 4inch
Lamella Glue - Silicon Rubber
Lamella Bending Radius - Unknown
Dampening - Polyurethane Foam/Polyester Fiber
Copper Rods - L x W Unknown
Top Cap - W x D x L Unknown
Top Cap Hole Diameter -Unknown
Mid- Hollow -Rod - W x D x L Unknown
Voice coil Diameter -
100mm OD (10cm)
Voice coil/Former - 4n copper wiring used Likely
Voice coil/Former- Glue used is car break glue Likely
Voice coil/Former - Former Used Unknown
Voice coil/Former - floats in Ferrofluid likely
Magnetic Material - Ferrite
Magnet size - 200mm OD (20cm)
Spider ID-OD - 100mm (10cm)
Melon
Additional Driver Info

The aluminum lamellas are a sandwich construction of two aluminum wedges held with epoxy resin Wrong. The petals are given 2 days to cool like airplane parts. layers of polyurethane foam are slapped on the back of each lamella to provide damping and additional mass. Each lamella is fitted with 2 thick reddish copper ''wires''. The wires are fitted into the vertical recesses of the petal. The wires add mass and an aesthetic beauty. The recesses of the driver are rolled and not stamped. The whole assembly rest on a cast aluminum plinth coated in automotive grade atracite metallic paint.

The sub woofer
The woofer is a 12" driver with a 4" voice coil. The voice coil is composed of black anodized aluminum that has a very low thermal resistance, approximately 1 K/W. This gives the system large power handling capability. The voice coil wire is also constructed of high temperature material able to withstand temperatures of up to 360¡C. The wire is glued with the same glue used in the fabrication of motorcycle brakes, and is able to withstand a temperature of 260¡C. As a result, it is almost impossible to destroy the speaker. The air gap is 10 mm high and the moving coil has a winding width of 24 mm. Thus, the speaker possesses an extremely high linear throw, with a maximum of 14-mm peak to peak. The maximum mechanical throw is two times greater -- 28 mm maximum peak to peak.
For this i hope to substitute for this driver
TC Sounds Axis 12Q1 12" Quad VC Subwoofer 293-638


The cabinet :
Material - MDF
Material thickness - 30mm (1.25")
Port Holes - 2 inches in Diameter

Additional cabinet info
the cabinet has rectangular cross configuration to both stabilize the walls and hold the magnet with polyurethane supports.

specifications:
Crossover frequencies: 105Hz, 600Hz, 3.5kHz (Linkwitz-Riley, fourth-order). Acoustic center: 45" (1140mm) from floor. Frequency range: 24Hz–40kHz. Sensitivity: 81dB/2.83V/m. Nominal impedance: 4 ohms. Power handling: 320–500W continuous, 2.2kW peak.

Right now i am hopping to simply replicate the mid-range and used them as my stereo setup and as research and design along with resources progress the replication of the other 2 drivers will begin. I am learning to use Femm so that i can design and build the magnetic circuit for the mid range.The processes for building the mid range will hopefully be done in parts such as

Step 1 : Magnetic circuit fully designed and optimized in femm

Step 2 : ferrofluid properties such as viscosity,heat tolerance,and Gauss rating can then be calculated

Step 3 : Carbon fiber baking methods can be R&D

Please tell me your thoughts on such a project

Last edited by Magnasanti; 13th November 2012 at 06:34 PM.
  Reply With Quote
Old 21st September 2012, 10:03 PM   #2
diyAudio Member
 
Magnasanti's Avatar
 
Join Date: May 2012
Location: Georgia
Send a message via Skype™ to Magnasanti
Default Pictures shedding light on Speaker construction

The Tweeter
Attached Images
File Type: jpg 101.jpg (39.9 KB, 1118 views)
File Type: jpg mblconstruction.jpg (64.4 KB, 1098 views)
  Reply With Quote
Old 21st September 2012, 10:07 PM   #3
diyAudio Member
 
Magnasanti's Avatar
 
Join Date: May 2012
Location: Georgia
Send a message via Skype™ to Magnasanti
Default Mid-Range naked

Construction of the mid range.
Attached Images
File Type: jpg Mbl mid Baked sheet of carbon fiber.jpg (18.7 KB, 1074 views)
File Type: jpg Mbl mid - computer cut lamnella.jpg (13.1 KB, 1057 views)
File Type: jpg MBl assembly of the mid-range.jpg (33.4 KB, 1058 views)
File Type: jpg Mbl mid the petals are glued to the voice coil and thrust plate.jpg (14.8 KB, 296 views)
File Type: jpg Mbl mid partially asmebled with thrust plate held in place.jpg (14.9 KB, 211 views)
File Type: jpg resan8038.jpg (43.1 KB, 316 views)
File Type: jpg Mbl naked mids 3.jpg (27.9 KB, 310 views)
File Type: jpg Mbl Mids Single.jpg (380.9 KB, 320 views)
File Type: jpg mid-range inner workings.jpg (28.1 KB, 334 views)
  Reply With Quote
Old 21st September 2012, 10:10 PM   #4
diyAudio Member
 
Magnasanti's Avatar
 
Join Date: May 2012
Location: Georgia
Send a message via Skype™ to Magnasanti
Default The Melon naked

The Melon construction
Attached Images
File Type: jpg Mbl melon lamnella.jpg (34.9 KB, 295 views)
File Type: jpg Mbl melon lamnella after rolled corrigation.jpg (14.2 KB, 203 views)
File Type: jpg Mbl melon lamnella after dampening has been applied.jpg (14.9 KB, 152 views)
File Type: jpg showing dampening.jpg (36.3 KB, 177 views)
File Type: gif Mbl melon parts.gif (37.6 KB, 195 views)
File Type: jpg mbl naked 4.JPG (158.2 KB, 273 views)
File Type: jpg mbl melon the black elastic bands are being put on and so is external dampening.jpg (20.0 KB, 242 views)
File Type: jpg Mbl Naked 6.JPG (152.3 KB, 230 views)
File Type: jpg mbl melon beinge flued to thrust plate and motor sytem.jpg (25.0 KB, 232 views)
File Type: jpg putting on lamellas.jpg (44.9 KB, 205 views)
  Reply With Quote
Old 21st September 2012, 10:11 PM   #5
diyAudio Member
 
Magnasanti's Avatar
 
Join Date: May 2012
Location: Georgia
Send a message via Skype™ to Magnasanti
Default The Melon naked Con't

The melon construction
Attached Images
File Type: jpg Adjusting voice coil wire.jpg (368.1 KB, 226 views)
File Type: jpg putting on lamellas.jpg (44.9 KB, 136 views)
File Type: jpg melon wires.jpg (161.3 KB, 203 views)
File Type: jpg mbl_rundstralere_11.jpg (127.5 KB, 206 views)
File Type: jpg Mbl naked melons 8.jpg (21.7 KB, 125 views)
File Type: gif MBL naked all.gif (21.2 KB, 132 views)
File Type: jpg mbl melon naked 3.JPG (155.6 KB, 175 views)
File Type: gif Mbl head cut off.gif (31.7 KB, 187 views)
File Type: jpg showing spider.jpg (28.0 KB, 191 views)
File Type: jpg Guy holding completed Melon.JPG (39.7 KB, 235 views)
  Reply With Quote
Old 21st September 2012, 10:14 PM   #6
diyAudio Member
 
Magnasanti's Avatar
 
Join Date: May 2012
Location: Georgia
Send a message via Skype™ to Magnasanti
Default Areczek finished speakers

Pictures of Areczeks finished speakers
Attached Images
File Type: jpg Areczeks completed Mbl clones.jpg (199.6 KB, 277 views)
File Type: jpg Mbl areczek.jpg (195.2 KB, 269 views)
File Type: jpg Omni''grand melone''.JPG (172.2 KB, 235 views)
  Reply With Quote
Old 21st September 2012, 10:15 PM   #7
diyAudio Member
 
Magnasanti's Avatar
 
Join Date: May 2012
Location: Georgia
Send a message via Skype™ to Magnasanti
Default Driver choice

Mid Range is the Dayton Audio Rs52an-8 2" Dome Mid range.

Attached Images
File Type: jpg 285-020_m.jpg (1.2 KB, 1126 views)
File Type: jpg 285-020_mii.jpg (1.4 KB, 1127 views)
File Type: jpg 285-020_mi.jpg (1.3 KB, 1128 views)

Last edited by Magnasanti; 21st September 2012 at 10:26 PM.
  Reply With Quote
Old 21st September 2012, 10:16 PM   #8
diyAudio Member
 
Magnasanti's Avatar
 
Join Date: May 2012
Location: Georgia
Send a message via Skype™ to Magnasanti
Default Dayton Anotomy

Dayton mid range taken apart.
Attached Images
File Type: jpg IMG054.jpg (497.2 KB, 187 views)
File Type: jpg IMG056.jpg (402.9 KB, 124 views)
File Type: jpg IMG057(1).jpg (470.1 KB, 132 views)
File Type: jpg IMG060.jpg (436.0 KB, 148 views)
File Type: jpg IMG058(1).jpg (363.5 KB, 259 views)

Last edited by Magnasanti; 21st September 2012 at 10:28 PM.
  Reply With Quote
Old 21st September 2012, 10:17 PM   #9
diyAudio Member
 
Magnasanti's Avatar
 
Join Date: May 2012
Location: Georgia
Send a message via Skype™ to Magnasanti
Default Models of drivers

A MS paint illustration showing mid range driver components.
Attached Images
File Type: png Mid-Range model.png (67.0 KB, 364 views)
File Type: png Tweeter 1.png (127.8 KB, 295 views)

Last edited by Magnasanti; 21st September 2012 at 10:30 PM.
  Reply With Quote
Old 24th September 2012, 02:34 AM   #10
expert in tautology
diyAudio Member
 
bear's Avatar
 
Join Date: Apr 2002
Location: New York State USA
Does it make sound?
Does it not fall apart?

_-_-bear
__________________
_-_-bear
http://www.bearlabs.com -- Btw, I don't actually know anything, FYI -- [...2SJ74 Toshiba bogus asian parts - beware! ]
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Summer Project - Replication of MBL loudspeaker 101mkII Magnasanti Planars & Exotics 77 21st November 2012 08:31 AM
Possible Summer Project bose301s Multi-Way 8 17th June 2009 11:25 PM
Possible Summer Project bose301s Multi-Way 8 29th May 2009 07:49 PM
Opinions on a Summer Project athos56 Multi-Way 19 13th May 2007 10:40 PM
Summer Project edjosh23 Multi-Way 19 9th June 2005 01:37 AM


New To Site? Need Help?

All times are GMT. The time now is 08:09 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2