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Old 22nd July 2013, 02:14 PM   #1
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Default Need Help with The Smallest 3 way Speaker Plan for LM3886 Triamping

Respected friends,
I started this thread here as per the suggestion of two experienced members.

I just finished a 3 way Active LM3886 Amplifier system with the kind help of all the great people in the chip amp thread here.
http://www.diyaudio.com/forums/attac...886-update.jpg

I am getting a very good and impressive dynamic sound with deep bass from a pair of my earlier not so "grammatically" built 3 way Floor Stander speakers even with non standard cheap drivers.

But I have no idea whether the sound is fully optimized or not or if it can be be made better with a better enclosure.

I want to build the enclosure as small as possible yet preserving the quality due to the space constraint in my room with your help.

For that, I need a plan to suit my drivers.

The size of the woofer is 6.5 inches.
The midrange is 4 inches and the tweeter is 2 inches.
Unfortunately no specific data is available about the unbranded drivers.

I am using an Active 3 way Xover to drive 6 set of LM3886 amps.
2 amps for woofers, 2 for midrange drivers and 2 for tweeters.

Room Size is 10 ft X 12 ft approximately.

Math is not my piece of cake.
My only skill is that I can make PCBs with toner transfer method and solder them satisfactorily.

Hence I need your handholding sincerely with a plan for a 3 way active speaker enclosure design for my newly built system.

Kindly help me out.
Thank you all.
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Old 22nd July 2013, 05:20 PM   #2
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No plan can be suggested without knowledge of said drivers specifications. What your tastes are in music, decor, etc.

More detailed information is required to proceed
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Old 22nd July 2013, 05:36 PM   #3
kbzx35 is offline kbzx35  United States
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You can always pick from known designs. Statement monitors designed by Jim Holte look like it meets your requirements. just order the speakers a la carte since you don't need a passive x-over.
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Old 22nd July 2013, 08:12 PM   #4
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Quote:
Originally Posted by Greebster View Post
No plan can be suggested without knowledge of said drivers specifications. What your tastes are in music, decor, etc.

More detailed information is required to proceed
Thank you for your reply.

I tried to obtain the driver specification on net, but I simply failed.
Will it be helpful if I post some photos of my drivers?

I like listen to all kind of music e.g. Jazz, Rock, Pop, Oriental, almost everything depending on the mood.

Regarding décor, I have attached a picture.
Attached Images
File Type: jpg room.jpg (18.8 KB, 373 views)
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Old 22nd July 2013, 08:17 PM   #5
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Quote:
Originally Posted by kbzx35 View Post
You can always pick from known designs.
Statement monitors designed by Jim Holte look like it meets your requirements. just order the speakers a la carte since you don't need a passive x-over.
Thank you for your reply.

I have no online purchase facility yet.

Could you kindly post some links to free plans or known designs?

I posted the picture of the arrangement of my room in the previous post.
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Old 22nd July 2013, 08:53 PM   #6
kbzx35 is offline kbzx35  United States
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I apologize as I didn't read your initial post correctly. i assumed that you were looking for speakers that fit that description as opposed to already having those drivers. Pics of the drivers will help as that is currently the only piece of info you have to identify them. Hopefully they are recognizable from a known company and can be ID'd. Unfortunately the size of the speaker will heavily rely on the characteristics of the woofer.

Quote:
Originally Posted by csom View Post
Thank you for your reply.

I have no online purchase facility yet.

Could you kindly post some links to free plans or known designs?

I posted the picture of the arrangement of my room in the previous post.
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Old 23rd July 2013, 03:11 AM   #7
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My suggestion would be to concentrate on the woofer first, as most of the space will be taken up by the enclosure for the woofer.

Stick with a sealed enclosure for the woofer, as some misalignment with a sealed system is not too important.

A 6.5" woofer probably won't need an enclosure with more than 64 liters internal volume. So you should make a test box with that internal volume. That works out to 25 cm by 40 cm by 64 cm on the inside of the box. Make the box so that you have some way to decrease the internal volume in steps.

Make a damping tester from a 1.5V battery and a SPDT switch. The pole of the switch is connected to the (+) terminal of the woofer. A first throw of the switch connects to (+) of the battery. The second throw of the switch connects to (-) of the battery and woofer.

For the 64 liter box, probably you will hear a click each time you make and break the connection of the battery to the woofer. What you would want to do is decrease the size of the box as much as possible while still getting a click-sound on make and break of the switch. When you hear a thud or a bong on make or break, the size of the box has been made too small.

By listening to music, check that bass response is adequate where the box size is that which was selected by using the damping tester.
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Old 23rd July 2013, 02:14 PM   #8
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Quote:
Originally Posted by kbzx35 View Post
......... Pics of the drivers will help as that is currently the only piece of info you have to identify them. Hopefully they are recognizable from a known company and can be ID'd. ........
Thank you so much for the reply.
Here are some photos of the drivers. Kindly have a look, all.

For the midrange section, I am using an old Philips 4'' full range driver with its enclosure.
Attached Images
File Type: jpg woofer.jpg (178.6 KB, 345 views)
File Type: jpg midrange.jpg (64.6 KB, 337 views)
File Type: jpg tweeters.jpg (44.3 KB, 326 views)
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Last edited by csom; 23rd July 2013 at 02:21 PM.
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Old 23rd July 2013, 02:19 PM   #9
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Quote:
Originally Posted by cT equals piD View Post
My suggestion would be to concentrate on the woofer first, as most of the space will be taken up by the enclosure for the woofer.

Stick with a sealed enclosure for the woofer, as some misalignment with a sealed system is not too important.

A 6.5" woofer probably won't need an enclosure with more than 64 liters internal volume. So you should make a test box with that internal volume. That works out to 25 cm by 40 cm by 64 cm on the inside of the box. Make the box so that you have some way to decrease the internal volume in steps.
Thank you so much.
I am a bit lost with the placement of the woofer whole in the enclosure.
Kindly have a look at the 3d drawing in the attachment.

Quote:
Originally Posted by cT equals piD View Post
Make a damping tester from a 1.5V battery and a SPDT switch. ...............
..................
I tried to make that in 3d, kindly correct me if I am wrong.
Attached Images
File Type: jpg woofer-position-adjustment.jpg (17.0 KB, 326 views)
File Type: jpg damping-tester.jpg (36.0 KB, 63 views)
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Old 23rd July 2013, 02:50 PM   #10
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Measure what you have and this will help with those unknown specs.
Measuring Thiele / Small Loudspeaker Parameters

ARTA (LIMP) and Room Equalization Wizard (REW) can measure FS, frequency response and room acoustics. Get yourself a a calibration microphone, like a UMIK-1 from MiniDSP, something that Parts Express carries several or if your friends already have one to make these measurements. These can be made if you are handy with electronics too. Many are available for little cost, soaring to WOW that's pricy (but deadly accurate) types.
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