How to get real 16Hz...

[4313B]

The tuning frequency will drop to around 20 Hz and you can then add a +6 dB bump filter at 20 Hz using a network like the 5234A/5235.

I've done both and prefer the non-EQ'd version in general but you might like it for movies.

Watch the Disney movie Atlantis. Find the track where the Leviathan attacks

[Ralf]

Next week the 4 cabinets are ready and I will beginn to install the drivers.

I have to recone two of the 2245H before...

Pictures will follow....

I am strained, as they get along with my 4530.
Possibly it does not sound. I have however still two 2235H remaining....

Ralf

[Steve Schell]

Being a front horn loaded kind off guy (hick!) I took a different approach to covering the bottom two octaves. I built a 15Hz. flare exponential horn sub which uses a single 15" driver (Altec 515-16G) and a split, W bin style 20 foot internal horn path. The enclosure is roughly 8' by 8' by 2', and stands on end against a wall and exhausts out the side. When the mouth is placed 4' from a corner, the corner becomes the final bend in the flare and the room maintains the flare expansion quite well out to 35' or so total path length.

I've been very happy with the results. Sensitivity is about 107dB, and the -3dB point is 20Hz. To me the results sound cleaner and more dynamic than any direct radiator subs I have heard, or horn subs with a short flare and EQ bump on the low end. The downside of this design is the low Spouse Acceptance Factor, and the 20 millisecond delay due to the path length. I am about to try dialing this delay out through digital means.

[boputnam]

Originally posted by Giskard
Watch the Disney movie Atlantis. Find the track where the Leviathan attacks

Or, since we're on a kiddie theme... Watch "Finding Nemo" and play the track where the submarine is slipping off the reef edge into the abyss.

[Ralf]

here are some pics from the project...

[Ralf]

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[Ralf]

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[Guido]

Good God!

I start to feel that "after soundtrack ringing" in my ears.

[Ralf]

you will not get a ringing with that...you will get vibrations...

Originally posted by Guido
Good God!

I start to feel that "after soundtrack ringing" in my ears.

[andresohc]

Those look great!, I have a 4518 enclosure that looks like an ugly version of yours (beat up pro cabinet). It has the same three vents, designed for the 2245h. The JBL tech sheet says 4518 is tuned for 30 hz, I havent read this thread lately and forgive me if you posted this, but whats the volume of the enclosures and the size of the ports. I actually wanted to try and tune my 4518 enclosures to closer to 20 Hz

Are the clamps for the veneer, are you using finished one side plywood or did you veneer the mdf? Man, the one who dies with the most clamps wins
Nice setup.

[Ralf]

Hi andresohc,

here is an excerpt of this threats:

[ Maybe I have a solution....

To get really 16 Hz it is a Problem with Power compression....so I downgrade to 20Hz...but this is possible with enough sound pressure...my computations resulted in the following:

- Together with my system (2x4530/2226H + 2x2206, 2x2344/2426J, 2x2404) 20Hz can be only reached, if 4 2245H-18"-Speakers are used (cutoff 50-60Hz).

The following conditions are to be considered:

- maximum sound pressure adapted to the 4530

- maximally linear frequency characteristic down to 20Hz

Here is the solution:

4 x vented enclousures
(housing with the following dimensions (25mm MDF):

Width x Depth x Height
573mm x 673mm x 1036mm

3 Ducts:
outside dia. meters of 100mm,
inside 93,7mm,
length 314mm

Pictures will follow...

Greetings
Ralf


QUOTE]Originally posted by andresohc
It has the same three vents, designed for the 2245h. The JBL tech sheet says 4518 is tuned for 30 hz, I havent read this thread lately and forgive me if you posted this, but whats the volume of the enclosures and the size of the ports.
[/QUOTE]

[Ralf]

Originally posted by andresohc

Are the clamps for the veneer, are you using finished one side plywood or did you veneer the mdf? Man, the one who dies with the most clamps wins
Nice setup.

I have veneered the mdf with walnut wood. I use the clamps to glue the plates correctly. It is difficulty, because the plates are cut approximately in the 45 degree angle. So I need a lot of clamps...

[dieterj]

Very nice Enclosure, Ralf!

Dieter

[Robh3606]

How about a 2245 in one of these???


Rob

[Ralf]

Originally posted by Robh3606
How about a 2245 in one of these???


Rob

YEAH !!! That`s it! Thx for this great idea!!!

Ralf