dual woofer horn loaded bass bin

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trespasser_guy

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#1
I was looking at building either a horn loaded sub, or a fully horn loaded system. My only problem is the bass bin's sensitivity. I was wanting to use two 15" pro woofers if possible- each with around 100 dB sensitivity. Both are 8-ohm. What total efficiency will I have if I use them in a folded horn enclosure? Will it need to be series or parallel? Thanks

Also, what other online stores sell decent high-efficiency woofers?
 
#3
trespasser_guy said:
I was looking at building either a horn loaded sub, or a fully horn loaded system. My only problem is the bass bin's sensitivity. I was wanting to use two 15" pro woofers if possible- each with around 100 dB sensitivity. Both are 8-ohm. What total efficiency will I have if I use them in a folded horn enclosure? Will it need to be series or parallel? Thanks

Also, what other online stores sell decent high-efficiency woofers?
Click to expand...

Lambda Acoustics has several high-efficiency woofers, and they are going out of business in a few months and are discounting all of their woofers. They seem to have good reviews. Look at the TD series. I am considering buying a pair of TD-M woofers.

--
Brian
 
#5
Do you have the drivers, or are you looking to spec them before you buy?
What Fc are you looking for?
What loading (wall corner etc)?
How big can they be?
Do you have any knowledge or experience designing horns?

Very few drivers work well in horns as the T/S parameters for most are optomised for ported enclosures. Simply designing a flare and throwing any 15" driver into it is a sure method to get poor results.
 
#6
You could try the Lab project, with a couple of Adire DPL12 drivers, which seem to work well in this project from what I have been reading. Don't worry about them using 12" drivers, they will work just as effectively as 15"s

Caution, if you post on this board, be careful, they don't have much time for HI-FI types.
 
#7
pinkmouse said:
You could try the Lab project, with a couple of Adire DPL12 drivers, which seem to work well in this project from what I have been reading. Don't worry about them using 12" drivers, they will work just as effectively as 15"s
Click to expand...
They'll work better than all (off the shelf) 15s because they were designed for the job.
In the US, using the original drivers might be cheaper. Form PE they're only $150 ea, which is all I paid from Orange County Speaker.
Caution, if you post on this board, be careful, they don't have much time for HI-FI types.
Click to expand...
LOL. True though.
 
#8
horns

there is a program called hornresponse.zip

with some t/s it models response and impedence and stuf

but u cud just find some existing plans...


www.geocities.com/loudspeakerguru



possibly available from the single driver website,and also melhuish... il find the links on my other pc.

bassbins tend to be smallmouthed stackers to get enuf mouth...
so sometimes iwth a few not many of them they only go to 70hz etc.

true bass horns are large...

www.geocities.com/sc00byd0159

🙂
 
#9
EFFICINCY--- is the precentage of electrical power converted to acoustical power

it is rated in a %

Normal direct radiating speakers have an efficiency of less than 2%. Horns on the other hand can have 20-60% efficiency. meaning they convert 20-60% of the electrical power to sound

SENSITIVITY--- is a SPL rating in DBs that is done at some measured distance & at some measured input power. (1W/M)

they are two different things----- and horns outproform in both specs


they're just big--- and time consuming to design
 
#10
Re: horns

mikee12345 said:
there is a program called hornresponse.zip

with some t/s it models response and impedence and stuf
Click to expand...
Nope. You don't plug the T/S values into it. You have to know what throat and mouth sizes will work, as well as choosing a flare type and length. It's not plug and play like it is with a ported or sealed box.
<a href="http://www.users.bigpond.com/dmcbean/">Horn Response</a>
but u cud just find some existing plans...
www.geocities.com/loudspeakerguru
Click to expand...
Jeff has some great designs, but they're optimised for PA, so may not be suitable in a domestic situation.

Take a look at the <a href="http://www.btinternet.com/~speakerplans/sp/page11.html">186 horn, using an Eminence Omega Pro 18.</a> for a proven design that works. Been thinking about one of these myself for my bass guitar, with a front loaded 10" coax above it.
true bass horns are large...
Click to expand...
Yep. You can't cheat physics with horns.
 
#11
I have little experience designing horns... I was looking at dual 12" or 15", preferably 15". If a single woofer can give the desired SPL of 104dB, then one 15" would do as well. I was looking to build a simple folded horn, similar to the LaScala. What would I need to know in order to do this? What kind of woofer would work? What SPL gain will a cabinet of similar size as the LaScala give?
 
#12
A friend of mine designs and builds horns and a single fold 30Hz horn is large enough for me to crawl inside. True because I did. So the horn is around 10' long and has a mouth of around 2' by 4'. Building folds is one thing. Getting the flair and the mouth is the hard part. K-Horns as large as they are probably have less than 50% of the horn in the cabinet since they make use of the walls as a major portion of the horn.
Also having heard a very large K-Horn made custom for a radio station in the early 50s and the large single fold, the single fold is much quicker and less muddied. Both of these use single drivers.
 
#14
Re: Little woofers

BAM said:
On the EAW website, it says it doesn;t matter what size the woofer is, only the length of the horn is important (justifying the use of 12" woofers in their Bent Horn Subwoofers which I understand are very good)

Could I build a folded horn with 4 5.25" woofers and get good bass down to 40 Hz?
Click to expand...
yes you can.

just a note it can be a bad idea to use BIG subs in a horn if they aren't designed for it. The size of the cone will lend itself to weakness when in a horn. Remember the sub must move BIG long colums of air on top of the cone. Any waekness will destroy the cone-----ripping it or total cone damage. This is way it it better to use smaller subs. ----- less distance from the voice coil to the cone edge
 
#16
Re: Little woofers

BAM said:
On the EAW website, it says it doesn;t matter what size the woofer is, only the length of the horn is important (justifying the use of 12" woofers in their Bent Horn Subwoofers which I understand are very good)
Click to expand...
Mouth and throat area, as well as length and radiaation space determine how well a horn will perform. Whilst it's true that a good 12 in an optimised horn can outperform a 18 in some instances, remember that EAW use custom designed and specified drivers. Going and putting any 12 in a horn designed for a specific 15 (or 18 or 12) will not work.

Could I build a folded horn with 4 5.25" woofers and get good bass down to 40 Hz?
Click to expand...
Yes, but why would you want to?
chris229 is correct that the large pressures inherent in horn loading can damage large cones, this will NOT be a problem in a domestic situation, unless you use a POS driver. Why would you bother doing that when you are going to build a complex cabinet to house it?
At about 110dB, my LABhorn drivers will be moving about 1mm.
 
#18
Re: Re: Re: Little woofers

bob4 said:


sic!!!!!!!:bigeyes:

How many did'ya build?? Do you use them only at home?
Click to expand...
Two are under construction, along with the flare extenders Tom Danley suggested. The first boxes had to be scrapped due to an error in the timber cutting phase (done professionally).
They will be used exclusively in my living room, and will be EQd to get a flat response to 20Hz (maybe 6-8dB of EQ). Do you think my 500W/ch Perreaux amp will be big enough to drive them satisfactorily?
 
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