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Old 16th April 2007, 09:01 AM   #1
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Default 12 inch full range

Any opion about these?

I found them here,

http://www.commonsenseaudio.com/

I was thinking maybe they would sound nice in a large lounge like mine. And If I'm going to spend money and pay hideous amounts of postage, may as well go for the big mothers.......

Your comment would be appreciated.
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Old 16th April 2007, 01:37 PM   #2
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They look decent enough, although with such a high Vas, they're going to need a hefty sized cabinet. Worth looking into, as they certainly appear to be both well build and engineered. I'd be adding tweeters to them though -no way is a cone of that size going to do 20KHz. Even assuming it can get up there, it's not going to do it with much grace. View them as big WR drivers and you're about there.
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Old 16th April 2007, 03:56 PM   #3
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maybe i'll buy these speakers one day and put them in an open baffle, very close to the floor, wide and tall baffle would be way too ugly.
also i would have to get 10 band (at least ) parametric equalizer or use pc software equalizer. response curve is too rugged.
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Old 16th April 2007, 04:25 PM   #4
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Scott, you might want to take another look at the rather low quality pictures on the Commonsense website. The stamped basket/frame, particularly the mounting flange looks a little lightweight to me for a "full range 12" - without some damping treatment, I'd be wary of ringing.


Of course, at $200 per pair, there isn't an overabundance of FR 12" from which to choose.


Perhaps it would be worth pursuing the option of cast frames as available on their Super 8" ( for only $30 pr more)



As for the "ragged" response graph, for those still pursuing the holy grail of "smooth as silk" graphs, I'd tend to wait until the drivers were fully broken in ( 200-300 hrs of tender abuse) before making any rash decisions about polluting the signal path with any more elaborate than wide band correction.

Even better, some of the current work by Mamboni, Bud P, or others engaged in cone treatment techniques could mitigate issues beyond just a bumpy ride on the test rig, mechanically rather than electronically.
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Old 16th April 2007, 09:24 PM   #5
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This will be a one shot deal for me. I don't live in Europe or the US where your dollar has so much buying power. I can't afford to buy something, get it down here & then find out it is cheap rubbish. And then turn around and just go buy another pair.

I was thinking about putting a super tweater with them, what ever FR I end up with. These ones seem quite nice:

http://www.lcy.com.hk/diyhp/25114/enus/home.html

I don't want to blow money on a smaller FR say around 4-6, or maybe even 8in. And then realise they just don't give out a nice sound.
question; Will a smaller speaker have a narrower (hmmmmmmm,how do I put this) listening range. I mean will a smaller speaker have a very small sweet spot. As apposed to a larger driver, so I want have to worry about standing on my head 3.23mtrs from them naked or something to be happy with the sound.
I have been reading a bit on here about FR's, but it's very hard to make a decision. especially when it could turn out to be a very expensive mistake.

Those hemp ones seem quite nice as well.......Maybe i should just stick to the 8in. Theres seems to be more options available to me.



PS $200US would be about $500 by the time I landed them here, with the huge postage costs.
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Old 16th April 2007, 09:32 PM   #6
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Here I am talking about speakers and I haven't even finished my TT yet...........................Man if the Misses new I was thinking about another project she would castrate me....
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Old 17th April 2007, 08:29 AM   #7
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Quote:
Originally posted by chrisb
Scott, you might want to take another look at the rather low quality pictures on the Commonsense website. The stamped basket/frame, particularly the mounting flange looks a little lightweight to me for a "full range 12" - without some damping treatment, I'd be wary of ringing.

As for the "ragged" response graph, for those still pursuing the holy grail of "smooth as silk" graphs, I'd tend to wait until the drivers were fully broken in ( 200-300 hrs of tender abuse) before making any rash decisions about polluting the signal path with any more elaborate than wide band correction.

Even better, some of the current work by Mamboni, Bud P, or others engaged in cone treatment techniques could mitigate issues beyond just a bumpy ride on the test rig, mechanically rather than electronically.
Chris, good point about the construction. I took another look at those pictures, & I reckon you're right -they're going to need some basket / magnet damping. FE208ESigma construction quality they are not. Lot of driver for the money though. The cast basket etc would be interesting, if they ever did one.

Re the response, looking at the graphs, they drop off like a stone at 15KHz, so they're going to need a supertweeter up there, capped off probably about 10KHz as we'd do with the big Fostex Sigma unit, which is why I mentioned it.
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Old 17th April 2007, 02:15 PM   #8
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Hi enzedone,

it's the other way round - large speakers "beam" more than smaller ones. Now I don't know how large your large lounge is, and how sharp your lady's castrating knife...but if Fostex drivers 8" and smaller are available in NZ, Scott and his fearless gang of loonies will have plans to fulfil your needs, fear thee not.

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Old 17th April 2007, 05:44 PM   #9
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what do you mean "beam" . is it raise in frequency response or distortion or something else? my fostex 127 sound may be described as beamed, but only at high volumes, I am pretty sure it is a distortion.
shouldn't larger diameter speaker distort less if played at same volume as smaller speaker?
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Old 17th April 2007, 08:27 PM   #10
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It's not distortion -it's high frequency directionality. As frequency increases, so the sweet-spot narrows to a very tight angle / area. Tends to increase with driver-size.
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