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-   -   Humble low cost computer monitor system...driver specs are killing me! (http://www.diyaudio.com/forums/multi-way/42534-humble-low-cost-computer-monitor-system-driver-specs-killing-me.html)

JinMTVT 14th October 2004 03:19 AM

Humble low cost computer monitor system...driver specs are killing me!
 
I am in the process of deciding on drivers for a small computer monitor type + sub system that i will be building soon for my brother.

Cost is a problem since i am doing it for him as a favor + experience/fun for me :)
So it needs not to cost much.

Now here i stand with 2 choices after reading and reading on this great forum.

Either small 1 way sealed enclosures array + a < 200hz sub

OR

Dipole array ( OB ) 1 way + sealed sub

Then the same problem comes to me.

HOW TO LOOK FOR DRIVERS!!! :(

I have read and reread the meanings of the T/S parameters for the drivers, but i still CANNOT precisly determine what i need
as far as specs.

Everyone speaks about the Q, and that it should be higher to get better response from the driver at it's FS or the baffle FS ...
what is high ? is their some forumlas for that?

what about other parameters? what to look for?
what is less important?

then considering the 2 different type of loudpseaker i proposed,
i was looking at the http://www.partsexpress.com/pe/showd...number=264-806

TANG BAND W2-880SA 2" SHIELDED DRIVER

http://www.partsexpress.com/images/264-806m.jpg

wide band cone driver from PE ..
the response seems fairly good up to 17-18k wich is more than enough for the use ( computer sound, dvd and video games in a really small room )

i think that 3-4 of them on each side would be good.


would this unit be enough for a full range system ?
should i go with a bigger unit? 3" ? 4" ?


i wanted to have it crossed at maybe 300-400 range ..since it starts going down by itself in that range, wouldn't need much of a steep xo to have it terminated quickly

the rest of the bottom octaves would be taken care of with a
simple sealed bipolar 8" sub ? 8" should be more than enough
he doens't need anything under 50hz neway so ...


If you can suggest any links to learn on how to decipher the T/S parameters , or have any suggestion on the design type and drivers ... :)


also good links to basics of XO electrics would be nice :)
( i need really simple stuff..don't really need any correction here )

acenovelty 14th October 2004 04:45 AM

Might want to try getting this book.
Great Sound Stereo Speaker Manual: With Computer-aided Design Projects
or
Designing, Building, and Testing Your Own Speaker System with Projects: both by David Weems. Not overly technical and will help you build successfull speakers. Not great speakers, just good sounding basic stuff.

Neither book is very expensive about $15 on Amazon.com.

Prosit

JinMTVT 14th October 2004 05:08 AM

thank you very much, i'll look into those ..

HeatMiser 14th October 2004 08:17 AM

edit: Sorry I misread part of your post, please ignore me. I'll be off to bed now... :dead:

joensd 14th October 2004 09:07 AM

I havenīt tried a whole lot of drivers but the W3-871S is a very nice choice for PC-setup. I even didnīt try any filters with it so far and like it very much.
http://home.new.rr.com/zaph/audio/audio-speaker11.html
You might also wanna check the matching sub on Johnīs pages.

A very small alternative: .http://lautsprechershop.de/hifi/ct209.htm

The Elf1.5 might be an option as well if you wonīt mind it a little bigger

Timn8ter 14th October 2004 01:43 PM

There is a small vented enclosure for the W3-871S also. Assuming 3/4" material; 6.5"W x 7.5"H x 7.25" D.
Vent = 1" x 1"
No electronics needed.
This will get you decent response to a level where it's easy to add a sub. Power handling will not be as good as a sealed enclosure. I use a pair of these at work and they sound pretty good.

joensd 16th October 2004 12:59 PM

Quote:

There is a small vented enclosure for the W3-871S also. Assuming 3/4" material; 6.5"W x 7.5"H x 7.25" D.
Vent = 1" x 1" .
Tuned to like 85Hz?
Quote:

No electronics needed.
You mean without notch filter to get down the midrange?

Iīm working on a ML-TL with a 6,5" and one TBW3-871S with a 8,5" wide baffle. Do you think I can use the notch filter from Johnīs audio pages (I know itīs mainly BSC) to get midrange down.
The system sounds nice but with some records the TB sounds a bit like a trumpet.
http://img52.exs.cx/img52/2679/100_1916copy.jpg

Cheers

kneadle 16th October 2004 01:16 PM

Quote:

Originally posted by joensd

Tuned to like 85Hz?

You mean without notch filter to get down the midrange?

Iīm working on a ML-TL with a 6,5" and one TBW3-871S with a 8,5" wide baffle. Do you think I can use the notch filter from Johnīs audio pages (I know itīs mainly BSC) to get midrange down.
The system sounds nice but with some records the TB sounds a bit like a trumpet.
http://img52.exs.cx/img52/2679/100_1916copy.jpg

Cheers

I have the 881, which exhibits similar response. In my prototype enclosure, which is a good design but not ideally constructed, the 881 gets down to 100Hz easily, so some better construction is going to to give me at least another 10 or 15 Hz.

On the other hand, the TB honks like a goose at 1kHz, with another nasty peak at 9-10kHz. I ordered this kit to help me solve the problem: http://madspeaker.com/881Whisper/881WhisperKit.htm

Dave

Timn8ter 16th October 2004 02:46 PM

Quote:

Iīm working on a ML-TL with a 6,5" and one TBW3-871S with a 8,5" wide baffle. Do you think I can use the notch filter from Johnīs audio pages (I know itīs mainly BSC) to get midrange down.
Wouldn't hurt to try. You may need to adjust the values though.
In theory, shouldn't you be able to place the mid\woof higher in the cabinet? Your goal is different here than it would be for a single driver system. If so, you might be able to build a separate enclosure for the 871 inside the TL that matches the specs for John's filter.

thomas997 17th October 2004 05:48 AM

You might want to buy the W3-871's from: www.creativesound.ca instead


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