MCAP-CR_Suggested

Some reference design and drawings are listed here.
All the drawings below are based on author's calculation and design experience but not tested by author unless noted diferently.

Some of these are designed per request by certain readers. Most of designed cabinets are for more general use than for specific drivers. Suggested drivers are listed as well.
You may use this design or change design by yourself, if you agree to the condition that all the risk is taken care by youreslf. So you must not complain about design or drawing errors or sound if you do not like the sound of your works using these designs. This applies to all the coontents of my pages. User's satisfaction is not guaranteed.

Availability of standard wood material depends on business area.

It is assumed that standard thickness of plywood is 12mm, 15mm, 18mm, 21mm.
It is assumed that standard thickness of bonded pine wood is 12mm, 14mm, 18mm, 24mm.

Your information of available wood materials in your area is very much appreciated.

I wish you good luck with this information.

6 degree of freedom cavity resonator with 4.5" - 5" drivers.
b1 is for 15mm thickness woods and b2 is for 18mm thickness wood.
Chamber sizes are a little smaller than TR130b cabinet, but larger than TR130a cabinet. Suggested drivers are F120A, FF125K, and FE126E by Fostex, W5-1611SA by Tangband, L5 by Omnes Audio, HX132 by Ciare, and other 4.5" to 5" drivers.
Some 4" drivers with Neodymium magnets by Tangband may be used, but may not fit..
You may try 6" - 6.5" drivers as well, if you understand the risk and are self-sufficient.

Outline

6 degree of freedom cavity resonator with 8" - 9" drivers.
TR225a2 is all front duct version. It is designed to set along rear wall.
This cabinet may be huge for ones who lives in small apartment like myself. Cabinet will be heavy and may not be assembled or handled by single person. I cannot manufacture this cabinet, but may be useful for some special drivers like limited models by Fostex, Feastrex or other high performance drivers. Cost of one pair of cabinets will be 2,000 USD, if all the labour is supplied by youreself. Letting professional carpenters all the manufacturing will cost 5,000 - 10,000 USD depending on pricing.
I would rather recommend 5" systems like TR130b or c than 9" system, if you do not require specially high performance.

Outline

This is modified version of TR130c1. TR130c1 has complex structure and even myself made mistake in one channel (it was modified as version c2). Version c3 was designed not to make assembly mistakes. Basic design is same as TR130c1.

Suggested Drivers

Any Feastrex 5" drivers especially D5e
FE138ES-R by Fostex
W5-1611SA by Tangband
Other powerful 5" drivers
6.5" fullrange drivers may be suitable

Assembly Drawings

Isometric Assembly
Third Angle Projection Drawing
Cutting Plan

Outline

This design is for non-classical music. Lowest characteristic frequency was designed to 42Hz. Other characteristic frequencies are 58Hz, 82Hz, and 104Hz.
Lowest frequency of 42Hz will suffice for most music sources except particular classical musics. This is easy to assemble and economical.

Suggested Drivers

Mild 5" drivers are suggested.
L5 by Omnes Audio or HX132 by Ciare may be good to use with DU130a. TR130c3 is recommended for powerful drivers. Mild 4" drivers like FE103E by Fostex may fit.

Assembly Drawings

Isometric Assembly Drawing
Third Angle Projection Drawing
Cutting Plan

My design assumes that structure is rigid enough. It means that vibration of cabinet is not taken account. From this respect, wood may be selected in any way, unless material is not rigid enough.
I do not recommend very soft and/or light materials for structural materials. I prefer relatively heavy (density is bigger than 0.5 kg/L) materials.
Another important thing is availability and price. There are reasonably priced plywoods and bonded woods. MDF is also available, but it does not look good. Practically best material is linden-apiton plywood. It is relatively heavy and proce is reasonable. Another choice will be birch plywood. Birch plywood is more expensive than linden-apiton, but heavier.
Bonded pine wood looks better than plywoods. Disadvantage of bonded pine is its softness and its dimensional change. Even though pine wood was cut accurately, it changes dimension to 0.x %. This change makes difficult to assemble.
One advantage of DIY is to save money. We may choose best cost / performance materials with best drivers to realize best cost / performance.

Absorption materials should be chosen by users. Function of absorption materials is mainly abosorb mid-range and higher range sound pressure inside the chamber. Low-range sound pressure will not be much affected unless ducts are plugged. Plugging any duct is not recommended, because MCAP-CR is designed to maximize characteric vibrations of masses in ducts.
I suggest not to use too much absorption materials, because it makes the sound dead. Using absorption materials must be based on user's preference.

Suggested Usage of Absorption Materials:

Use generally available and less expensive materials like sponge, cotton, soft cloth, soft paper, etc.
Begin with nothing then add one by one as you require.
Hang soft sponge behind the driver in the main chamber.
Some absorption material layer (10mm - 20mm) may be laminated to walls in the main chamber, if you feel that reflected sound from back cavity is annoying.
Some absorption materials may be set in subchambers; however, please note that you may not be able to remove absorption materials from subchambers after assembling the cabinet.

Important Notes:

Some absorption materials like glass wool may be harmful and not recommended.

Setting terminals should be taken care by users.
Some terminals may release sound pressure from its gap or gap between terminal and cabinet. Recommended terminals are:

+/- independent terminals (expensive solution)
Small flange type terminals (less expensive solution)
Not to use terminals but drill holes to cabinet for wires from driver and connect to speaker cable outside the cabinet or even directly to power amplifier. This is the least expensive solution.

Large and thin plastic terminals are not recommended.

Expensive wires are not recommended. Cables really affect sound quality, but effect is very small compared with other reasons like driver selection or cabinet design & manufacturing. 0.75 - 1.25 square milimeter copper wire for power handling use may suffice.
You may try very expensive audio wires. It is up to you.