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Old 7th March 2010, 05:26 PM   #1
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Default Open Baffle Fullrange speakers

Dear all,

I am looking for ideas for an open baffle pair of speaker, that utilizes a single pair of full range drivers, and is simple i.e. no XO.

The application is surround speakers mostly for home cinema and occassionally for music (therefore quality must be descent).

Has anybody tried this? Any links to high-quality projects?

Cheers
Evan
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Old 7th March 2010, 06:01 PM   #2
jerryo is offline jerryo  Isle of Man
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Hi chatziva,
there is a lot of information about what you are looking for so the first thing to do is try the "search" facility and then enjoy reading what comes up. Follow all the link trails that you come across and search again, and again, with different words and terms. This way you will gradually refine what you are looking for.
Do this first and then ask questions.
Have fun.
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Old 7th March 2010, 09:53 PM   #3
dcathro is offline dcathro  Australia
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Chatziva,

What's the budget?
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Old 7th March 2010, 10:58 PM   #4
MJK is offline MJK  United States
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Quote:
Originally Posted by chatziva View Post
I am looking for ideas for an open baffle pair of speaker, that utilizes a single pair of full range drivers, and is simple i.e. no XO.

The application is surround speakers mostly for home cinema and occassionally for music (therefore quality must be descent).

Has anybody tried this? Any links to high-quality projects?
Unfortunately you are not going to get much bass response from a single full range driver on an OB. Depending on the size of the baffle, you probably should not expect much output below 100 Hz. The roll off will start even higher if the full range driver has a Qts < 0.5 and the baffle is of a reasonable size (< 24" wide).
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Old 8th March 2010, 12:38 AM   #5
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a fostex fe167e may work well, based on an ifinite sized open baffle it will roll at 165hz (Fs/qts), also you need a large enough baffle to get anything below 200hz.

Norman
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Old 8th March 2010, 01:30 AM   #6
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Here's a chart showing cutoff frequency as a function of baffle width: Single Driver Website
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Old 10th March 2010, 07:06 PM   #7
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Quote:
Originally Posted by MJK View Post
Unfortunately you are not going to get much bass response from a single full range driver on an OB. Depending on the size of the baffle, you probably should not expect much output below 100 Hz. The roll off will start even higher if the full range driver has a Qts < 0.5 and the baffle is of a reasonable size (< 24" wide).
That is a problem as I also want to keep the baffle at minimum width due to WAF. A sub will take care of those low frequencies, but there might still be a small gap between 100-200hz.

Quote:
a fostex fe167e may work well, based on an ifinite sized open baffle it will roll at 165hz (Fs/qts), also you need a large enough baffle to get anything below 200hz.
Okay if we assume an infinite baffle then here are the options:

Driver Fs/Qts Power

FX120 70/0.45=155hz 30w
126E 70/0.25=280hz 45w
127E 70/0.43=163hz 45w
166E 50/0.21=238hz 65w
167E 51.5/0.3=172hz 65w
206E 39/0.18=216hz 90w
207E 39/0.26=150hz 90w
208ES 42/0.18=233hz 120w

So it looks like the winners are 127E, 167E and 207E.
Funnily enough the 167E is a good compromise between roll-off freq, power and cost. I would prefer the 207E due to the lower theoretical roll-off freq but it's too powerful for a surround speaker...Maybe will settle for the FE127E then

Quote:
What's the budget?
The budget I think should be around max 100 per unit, basically enough for a driver and some wood for the baffle. I aim for a very simple L-shape "enclosure" i.e. baffle, base, screws and spikes.

Last edited by chatziva; 10th March 2010 at 07:15 PM.
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Old 10th March 2010, 07:32 PM   #8
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Quote:
Originally Posted by jerryo View Post
Hi chatziva,
there is a lot of information about what you are looking for so the first thing to do is try the "search" facility and then enjoy reading what comes up. Follow all the link trails that you come across and search again, and again, with different words and terms. This way you will gradually refine what you are looking for.
Do this first and then ask questions.
Have fun.
I am familiar with the search functionality. I don't see the point of making non-comments if you think I've not done my research. Creating hostility doesn't help.
To me the point of a forum is to discuss and reposit information for everybody. Not just for me.
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Old 10th March 2010, 08:15 PM   #9
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Quote:
Originally Posted by chatziva View Post

So it looks like the winners are 127E, 167E and 207E.
If you want any of those, you should jump soon, as they are all discontinued.

dave
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Old 10th March 2010, 08:41 PM   #10
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Something like that, simple stuff
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