Multimedia Satellites, Open Baffle?, Full Range? Driver Selection Help Required - diyAudio
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Old 23rd April 2004, 07:01 AM   #1
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Default Multimedia Satellites, Open Baffle?, Full Range? Driver Selection Help Required

Hi all,

I am planning to build a pair of speakers for my PC. I am looking for some feedback on my preferred design concept and advice on driver selection.

Here are the facts;

1) Source will be PC sound card line level input full frequency range.

2) Low frequencies will be handled by a JBL 10" sub. The sub has adjustable crossover from 50 - 150 Hz.

3) The satellites will need to have shielded drivers as they will be sitting next to a monitor.

4) They will not need to produce very high SPL's as they will be about a metre from the listener. I will probably drive them with about 20W/Ch, I haven't built or bought a suitable amp yet but that is another project...

5) Budget for the drivers is about A$200 or US$140.

6) I would prefer drivers that retail in Australia.

7) My preferred design is an open baffle tilted back at about 15 degrees to point the drivers at the listener.


My questions are;

1) Is an open baffle design suitable in this situation and what are the design considerations?

2) Should I use a single full range driver or a two way design?

3) Would a ribbon tweeter be appropriate? affordable within my budget?

4) How small a midrange can I go and still get response to 150Hz in an open baffle? 100mm?

5) Can anyone point me to similar projects or to drivers that they have successfully used in similar circumstances?

Thanks
Howard
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Old 23rd April 2004, 09:06 AM   #2
joensd is offline joensd  Germany
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Hi,
do a search here in the forums for the Tangband W3-781S fullrange driver. As you plan in a sub anyway they might be the perfect companion.
I´ve got some for my PC setup and they´re perfect for nearfield listening but don´t have enough low end.
You might wanna use two per side to get more output from them.
Or cross them over at >200Hz.
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Old 23rd April 2004, 11:49 AM   #3
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Quote:
Originally posted by joensd
Hi,
do a search here in the forums for the Tangband W3-781S fullrange driver.
Thanks joensd,

I will look the Tangbands up, but I am not sure if they have a distributor in Australia. Can anyone help on availability of Tangbands?

Howard
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Old 23rd April 2004, 03:39 PM   #4
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Do you have local distribution for Fostex? The 3 or 4 inch full-rangers would be very nice also.
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Old 23rd April 2004, 04:24 PM   #5
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I don't know of a shielded ribbon, though some with low "leakage" may work.
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Old 23rd April 2004, 04:38 PM   #6
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I would do a box, either sealed or ported which ever is required to get suitable bass extension to meet the sub. Id choose sealed if possible but ported would be fine also.

Open baffles simply will not work unless you are prepared to have pretty damn large panels next to your PC or lots of EQ to boost the bass, which small 3" low xmax drivers wont handle IMO.

How far an open baffle will go down is to do with the baffle size not the driver, obviously the driver will set how low the system can go, like in a normal box, but its before that that matters when diffraction takes place.

If you wanted to go two way then an audax 3" midbass paired with either the TM025F1 tweeter or the even cheaper TW010F1 mylar dome would do nicely.

As you are in australia Wes components, ill have a look now what they sell A peerless 811435 tweeter and a vifa TC08SD49-08
mid/bass I think woud suit also.

The other suggestions are good too mindyou and will work out cheaper I'd imagine,although if you cannot get the tangband or fostex in aus then it might be cheaper to buy direct from wes.

Either way there my idea.
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Old 23rd April 2004, 06:50 PM   #7
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I've been contemplating PC speakers that consist of a tall vented box (~16" or close to ear level) with two TB W3-871S like the CSS Elf 1.5 but in bipole configuration. It would give a little better bass response and a more open sound than the standard forward firing design. You could roll off the rear driver if you wanted.
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Old 23rd April 2004, 07:20 PM   #8
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Tim,

With a dipole dont you need to space it far away from a wall, or other surface? I might be missing something here, but all my computers have been up against a wall or in a cabinet. If I am mistaking the requirements for dipoles then I would be really happy because I wanted to build your dipole pipe but I dont have the room to space it away from a wall significantly.

Milo
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Old 23rd April 2004, 07:39 PM   #9
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If you have about 2 feet behind them you should be fine. I understand PCs get pushed back but do your speakers also? I guess I'm envisioning a desktop PC using a CRT display. The speakers would be next to the front of the display which should put them out far enough to work ok. If it's in one of those little workstations pushed into a cubbyhole it wouldn't work well.
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Old 23rd April 2004, 08:00 PM   #10
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Quote:
Originally posted by Timn8ter
I've been contemplating PC speakers that consist of a tall vented box (~16" or close to ear level) with two TB W3-871S like the CSS Elf 1.5 but in bipole configuration. It would give a little better bass response and a more open sound than the standard forward firing design. You could roll off the rear driver if you wanted.
(more do, less think )

Approximately how wide and deep would such a speaker be?
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