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In Reply to: RE: yes, that is a very small baffle for "full range" reproduction posted by mhardy6647 on July 09, 2023 at 04:20:02
Hey, thanks.
I didn't read through your post very carefully upon initial read. Sorry.
So according to the chart, is 8t saying a baffle needs to be 130" in length in order to produce the lowest notes on a piano? And by "length" is it referring to the height of the baffle?
I've got a few single driver speakers but none are boxless.
"Man, that mouse is Awesome." - Kaemon (referring to Jerry, of Tom and Jerry fame)
Follow Ups:
Yea, and that is why you don't try to target 35 hz with open baffle speakers. Instead target something like 60 hz, which only requires ~50 inches. And then if you add wings which are directed backwards, then the front baffle is maybe only a few feet wide, but then with the added badkward wings which would only need to be a couple feet deep, you can get to 60 hz. Then below your 60 hz open baffle speakers, you have your subwoofers, which are designed to avoid room nodes by strategic placement in the room.
There are tricks that you can play to "cheat the system." If the midrange/midbass drivers have high Q (i.e, 1), you can get a "bump" in the bass, and if you get lucky, will give you deeper bass from the midrange/midbass drivers, and end up with a fairly flat frequency response - if you are lucky...
One word of caution, wings which are directed backwards and parallel to each other can create box resonances which can muck up the midrange/midbass, so then you have to play with absorption and/or splaying the rear baffle wings outward at an angle to reduce those resonances.
If you are tempted to try open baffle subwoofers, my suggestion is to not, but if you want to go down crazyland, more power to you.
If you want to use open baffle speakers to avoid room interaction, yes it will help some, but waveguides/horns are much more effective for doing so, and lower distortion due to the efficiency gain, at least that is where I ended up - waveguides/horns have their own challenges though.
Retsel
The front and rear waves from the driver cancel each other below the frequency where the front and rear of the cone are separated by less than one-half wavelength. One-half wavelength at 40Hz is 14 feet.
Bill is the one voice of reason. As far as most of the others--> For the life of me, I do not understand this constant denial of physics when it comes to plane board speakers instead of proper enclosures. **Not that all users are in denial, but most are**
Also, there exists this mis-understanding of Qts. If you think a "Q" of one gives you a *bump* in the response, I urge you to study the an-echoic response of the Eminence Alpha 15. Please tell me where you see the bump (?)
I've been at this for many many years, and YES I understand the evils of the boxy sound. There are ways to minimize the box without resorting to the plane board. Too much loss/cancellation in the bass region for my taste.
Now, open baffle for mid range can sometimes work out pretty good, but, again -- this is a matter of taste. All that negative energy splashing about the wall behind the speakers can add the illusion of spaciousness, but it's not accurate. Again, this is a matter of taste, and if the final sound quality is pretty good to the end user, than indeed it is pretty good. You don't need 100% accurate to enjoy the music.
Peace.
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