Horn Sub?

[rockbobmel]

Anyone heard of www.billfitzmaurice.com ? Check out the TUBA line.......

[sunburnwilly]

How about a horn loaded sub built into the foundation ?

[rockbobmel]

I saw that before. I think on TalkBass.com Prolly costs 1/2 gazillion buks.

[Jay481985]

been done

http://www.eaw.com/products/BH822e.html

http://www.avantgarde-usa.com/basshorns.html

[J.4knee]

Ya know, even though they cost a gazillion bucks the Avante Garde Trio's w/ the sub array are the sexiest looking system there is IMO

[rockbobmel]

dija check out the link?

[formica]

Not all the pages on the site are responding tonight but as

a general answer to the "horn sub" post... I'd like to post a link to

the recent thread How big a Khorn to reach 20Hz?

Horn subs would be huge.... but perhaps "Horn bass

bins" would be a more appropriate term...

Rob

[Colin]

Sunburn man, that is not the listening position on those basement folded horn enclosures. The sound exits through vents at not shown at the bottom of the picture and travels up to the floor above the listening position is more near the vents at the bottom of the picture than near the top. BTW, I think all of this construction still does only 10Hz! [H]

[sunburnwilly]

Colin , once the floor is laid down that is the listening position . The vents are on the opposite side of the room . Geez , I wish I could get a handle on this link posting thing ! http://www.royaldevice.com/custom.htm Does this work ? Anyway your right Colin , it only goes down to 10hz ...

[sunburnwilly]

OMG !!! It works ! I figured something out ! I'm gonna be a link posting fool now ! Now , if I could just figure out how to compose my replies instead of using runon paragraphs , I could be dangerous ... [li][li][li]

[Colin]

OK, that is the listening position on the floor above. The square end of the flare, at the bottom of the picture, goes towards the front of the room (top of the picture in the other photos).

[TheEAR]

Only goes down to 10Hz! They should demand a refund []

Even a mere 16Hz at -1dB from a reference of 60Hz at max SPL would be absolutley sick.As anyone with experience knows very few(and large may I add) subs can honestly claim to be flat(-+0.5dB)at FULL POWER down to below 20Hz.In fact not even SVS can measure up.All start to drop(roll off),all sealed have SEVERE rolloff below the resonance point when reaching SPL limits.

Velodyne's HGS18 as great sub as it is will roll off like a whimp when below 30Hz when pushed very hard.I have it I know it.Sunfire rolls off less in fact,no wonder as it uses PR's.SVS and most large naturally tuned ported subs will have the flattest curves at full power.

Klipsch RSW also fall under this effect,as the small cabinets force heavy EQ use,and EQ use has its limits,works wonders at low to medium SPL and soon the woofer and amp reach their limits.

[Jay481985]

yes theear sealed subwoofers have severe rolloff after resonance

frequency but it is not as sharp as say the roll off from the port

resonance frequency... And most ports are ported to around 20-25 hertz.

So infact a sealed system is much better in response under 10 hertz

then a ported subwoofer. Besides to have a port that is tuned to 10

hertz usually incurs a minimum of 10 feet.

[TheEAR]

Jay,

Problem is in the reality we live in...

Sealed subs are often in smallish enclosures relative to the optimal cabinet volume the woofer would require.Rolloff starts early and goes gently down...down.And this at max output is self evident,just looks are response curves around the next made at 90dB and then at 110dB(reference points around 60Hz).Near MAX OUTPUT all sealed subs fair poorly down low(including the HGS18).

Ported subs are often tuned lower then the sealed dropoff begins,less severe EQ needs to be applied.More output where it counts.

Look at the SVS,Klipsch THX and HSU.Great output where it counts down to 20Hz.

Take the HGS series,and any sealed sub.Down low ...say 25Hz they drop at high SPL.Losing linearity.

A great ported sub bests a great sealed sub ANY day in output(same amp power and same cone travel).

Now at low tro medium SPL a great sealed sub like the HGS15 or 18 will have lower distortion and sound more musical as the only surface producing the sound is the direct driven piston.

I have all types of subs and the best sounding so far are the larger sealed servo controlled ones,for HT where sea deep bass is a must the ported beasts take the edge with ease.

...

10Hz nobody cares about 10Hz.As your ear cannot HEAR this low.And a solid output to 16Hz is all anyone needs.10Hz and below is POINTLESS and not a practical goal.Unless you have a dozen Tumults used in IB design used with a amp limited to preven any over excursion of the cone.

[DrWho]

I'm not too sure what is to be gained by going with such a large

"horn-loaded" system...The basic function of a horn is an "impedance

matcher", but at those frequencies the room is already in pressure

mode. In other words, I don't think such a large horn in such a small

room is actually going to significantly increase the output of the

drivers because there's not any "impedance matching" to be performed

(hmmmmm, I think I'm using the right term...). I am curious to know the

true specs of that system and how much it cost.

[Jay481985]

When you saw svs, klipsch thx, hsu, etc etc you say companies which

have many factors that include cost, size, shipping, waf, building, etc

etc.

When it comes to diy sealed are just as good a deal. Also ports on subs

hit right where most movies are the 25-32 hertz range. Most ported subs

would be better for movies then say music.

actually I have a graph also

the first one if you remember is the subwoofer that I posted pictures

to the sealed dual tumult 15d2 in a 4.5 cubic foot exclosure. The

second is an experimental what if subwoofer. That one is 15 cubic

feet and has 6 Stryker Audio -PR18-2500. 18

inch passive radiators at 2500 grams. That experimental one is a size

of a fridge but look how flat the actual graph is. And this is all

anechoic so it should hit 130 db in room! But if you notice that at 12

hertz both sealed and passive radiator meet? and then the sealed

system that is ~3 times smaller is actually beating it? Basically the

passive radiators ran out of excursion and falls drastically just like

a underported subwoofer.

[rockbobmel]

The Tuba IS sealed behind the driver. The folded horn is in front. It uses an Eminence HL10 driver.