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Full range speaker [message #19660] Fri, 26 December 2003 01:54 Go to next message
Adrian Mack is currently offline  Adrian Mack
Messages: 568
Registered: May 2009
Illuminati (1st Degree)

hah, came accross a 12" full range speaker today :P a bit stupid.

http://www.eighteensound.com/pdf/12TC300.pdf

you need acrobat reader to see it.

I always wonder how could a fullrange speaker sound good when its able to develope parallax across the diaphram even. Notice the rather bumpy response up high on that speaker. It does 70Hz-16KHz

Re: Full range speaker [message #19661 is a reply to message #19660] Fri, 26 December 2003 06:49 Go to previous messageGo to next message
JLM is currently offline  JLM
Messages: 69
Registered: May 2009
Viscount
That driver looks to be mixed bag:

1.) Very good efficiency;

2.) Good power handling capacity;

3.) Ragged high end response (not unusual for extended range drivers);

4.) Severe roll off above 15,000 Hz (to be expected from a large driver);

5.) Severe off axis roll off of higher frequencies (again to be expected given the driver size);

6.) Bass roll off starts around 150 Hz (quite unexpected from a 12 inch driver, and this in a cabinet!);

7.) Specified bass response is severely overstated (this driver needs a sub that could use a smaller driver!);

8.) With Qt = 0.43 this could be a good candidate for bass reflex, transmission line, TWQP, open/infinite baffle.


Don't know the price (or recognize the brand) but a number of 4 - 8 inch diamter Fostex drivers that provide more extended frequency response with less beaming, but somewhat less efficient.

Re: Full range speaker [message #19662 is a reply to message #19660] Fri, 26 December 2003 11:03 Go to previous message
hurdy_gurdyman is currently offline  hurdy_gurdyman
Messages: 416
Registered: May 2009
Illuminati (1st Degree)
Now that is an interesting driver. The graph shows the response in a 50cu. litre box tuned to 60Hz, but doesn't show what kind of box. With a box that boosts low end, this could be a driver that covers all the important frequencies and just needs a sub for the lowest couple of octives and a super tweeter for the highest sounds. With that kind of sensitivity, any amplifier could drive it, and it comes in both 8 ohm and 16 ohm, to get even better amp matching (on a typical tube amp with the 16 ohm setting, these speakers could really put out some efficient sound). Sitting a bit off axis should tame the high frequency peak.
Of course, you can't tell what it will sound like untill you try it. ;^)

Dave

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