Thanks everyone for you input and clarification.
@just a guy "All courtesy of a quick google search." it was searching that got me confused in the first place. Some of the images were marked wrong and that is what led to the confusion.
Working on what most images agreed on brought me to the statements above. Which turned out to be right, but thanks for the pictures, it confirms I did have it right.
Yes it would appear the sound output from various designs is subjective, but what I pasted above seemed to be the consensus on that forum. As pointed out various design features or tweaks could easily impact the end result.
@turbodawg, that hog scoop looks interesting. Based on the above examples I would have called that a cross between a tapped horn and a back loaded horn. Where does the “scoop” come into it, it is called that because of the rapid opening at the mouth?
@AndrewT, this statement has me somewhat puzzled “The front of the speaker usually provides some acoustic output, but this is not a necessary condition for a BLH.” Some acoustic output suggests a far greater amount of sound is coming from the horn???
Which could suggest why many of the horns designs might sound similar, if the direct sound off the driver is not as loud as the sound from the horn (which by virtue of the horn would make perfect sense)
@All, The discussion about the how many octaves it would cover is not so important (other than others learning something) as I only want to use this specific sub for ~ >15Hz – 60Hz
@just a guy "All courtesy of a quick google search." it was searching that got me confused in the first place. Some of the images were marked wrong and that is what led to the confusion.
Working on what most images agreed on brought me to the statements above. Which turned out to be right, but thanks for the pictures, it confirms I did have it right.
Yes it would appear the sound output from various designs is subjective, but what I pasted above seemed to be the consensus on that forum. As pointed out various design features or tweaks could easily impact the end result.
@turbodawg, that hog scoop looks interesting. Based on the above examples I would have called that a cross between a tapped horn and a back loaded horn. Where does the “scoop” come into it, it is called that because of the rapid opening at the mouth?
@AndrewT, this statement has me somewhat puzzled “The front of the speaker usually provides some acoustic output, but this is not a necessary condition for a BLH.” Some acoustic output suggests a far greater amount of sound is coming from the horn???
Which could suggest why many of the horns designs might sound similar, if the direct sound off the driver is not as loud as the sound from the horn (which by virtue of the horn would make perfect sense)
@All, The discussion about the how many octaves it would cover is not so important (other than others learning something) as I only want to use this specific sub for ~ >15Hz – 60Hz
SS,
look at the Tannoy Westminster.
It is an FLH combined with a BLH.
The front acoustic output has been increased by using the FLH to bring it up to a useful level to match the output from the BLH.
If the front horn was not fitted, then the front output would be much lower. The result would be the tweeter loaded horn and the bass BLH dominating with very low levels of midband.
look at the Tannoy Westminster.
It is an FLH combined with a BLH.
The front acoustic output has been increased by using the FLH to bring it up to a useful level to match the output from the BLH.
If the front horn was not fitted, then the front output would be much lower. The result would be the tweeter loaded horn and the bass BLH dominating with very low levels of midband.
Sometimes back loaded horns are called scoops, I'm not sure why but possibly because they look like ice cream scoops?
An externally hosted image should be here but it was not working when we last tested it.
In a rear loaded horn, the designer usually tried to match the sensitivity of the horn to the sensitivity of the driver so that very wide bandwidth is achieved. If it's just a sub it doesn't matter though.
These things often go off on tangents that the OP didn't expect, that's normal.
The JBL 4520 and 4530 back loaded horns were nicknamed "sugar scoops" for the resemblance, the "sugar" portion of the nickname has gone out of favor over the years.
As designers realized that nice looking curves are not needed for LF reproduction, and waste valuable cabinet volume, "scoops" have become less common.
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