-

Jump to content



Photo
- - - - -

thinking of new project using AL1804 driver


This topic has been archived. This means that you cannot reply to this topic.
30 replies to this topic

#1 of 31 Chris Brock

Chris Brock

    Second Unit

  • 328 posts
  • Join Date: Sep 13 2003

Posted April 14 2004 - 07:34 AM

I am getting the itch to experiment again. so i am selling my tempest driver and am really considering going with one of the AL1804 drivers from audioliquidators.com. The alignment that i have been considering is an enclosure with 15 cubic feet of internal space and tuned to 16hz. I have a Nady XA900 amp (900wrms x 1 @ 4ohms) and a BFD. From what i can tell, after I do some eq'ing to get rid of the rise in response caused by the high inductance of the drivers VC, I would end up with a MONSTER sub. based on what i am seeing and on my past experiances i would guestimate that it should be able to produce a flat repsonse down to the mid teens and with the full power of my amp it should be in the neighborhood of producuing 120+ db in room clear down to 15 - 16hz. And the nice thing is because of the drivers large xmax and xmech i would almost never have to worry abotu bottoming the driver out. do you guys feel I am at least in the ballpark with these estimations? any input or comments would be appriciated!

chris brock

#2 of 31 Wayne Ernst

Wayne Ernst

    Screenwriter

  • 2,589 posts
  • Join Date: Feb 24 2002

Posted April 14 2004 - 11:51 AM

Chris,

Well, if you have the "itch" then you need to scratch it. The AL1804s seem like the way to go. Posted Image

You might also want to check with Kyle of Acoustic Visions to see when he'll start stocking the 18" driver based on the "Blueprint" design.

Finally, is there any reason why you are not considering an infinite baffle sub? I mean, if you want to "do it right" you should take a few minutes and think of the "I.B." possibilities. Or, maybe, you want to save that option for the next upgrade. Posted Image

[edit]: Chris, you might want to check this thread out regarding Audio Liquidators:

http://www.hometheat....hreadid=193609
"My reality check ... just bounced"

#3 of 31 Kyle Richardson

Kyle Richardson

    Screenwriter

  • 1,076 posts
  • Join Date: Jan 01 1998

Posted April 14 2004 - 01:15 PM

I'll have at least one 1804 in stock by the end of the week. Better hurry or I might find a use for it myself Posted Image
Kyle Richardson
Acoustic Visions

AOL Instant Messenger Name: kyler70
MSN IM: acousticvisions@hotmail.com

#4 of 31 Chris Brock

Chris Brock

    Second Unit

  • 328 posts
  • Join Date: Sep 13 2003

Posted April 14 2004 - 01:27 PM

thanks for th info kyle! i might just hit you up on that one. i swear man sometimes this hobby gets frusturating. the second i think i have "the final setup" i get the itch to try new things and upgrade, it never fails. i think it is really just the fact that i enjoy the work of building new things. so when i get somthing built it isnt more then a month before i am craving that excitment you feel when you fire somthing up for the first time.

#5 of 31 Brian-K-Owens

Brian-K-Owens

    Stunt Coordinator

  • 194 posts
  • Join Date: Feb 06 2003

Posted April 14 2004 - 04:33 PM

I had te 1803 in 13ft tuned to 17 Hz. EQ'd flat to 15 Hz (actually a 4 dB hump at 17 Hz in the output) and would make 135+ dB with 1000 watts RMS input. VERY loud. It was in a small 11' x 12' room w/ 8' ceilings corner loaded, and would move the room walls about 1/4" with a 17 Hz test tone playing at full volume!!!

Brian

I should add: Some friends came to listen to it one day after work, and from that point on it was nick named "the earthquake machine"!!!
Brian Owens

#6 of 31 Andrew Pratt

Andrew Pratt

    Producer

  • 3,813 posts
  • Join Date: Dec 08 1998

Posted April 15 2004 - 05:26 AM

Quote:
i think it is really just the fact that i enjoy the work of building new things. so when i get somthing built it isnt more then a month before i am craving that excitment you feel when you fire somthing up for the first time.

Boy does that sound familarPosted Image

#7 of 31 Chris Brock

Chris Brock

    Second Unit

  • 328 posts
  • Join Date: Sep 13 2003

Posted April 15 2004 - 12:45 PM

thanks brain for that little bit of info. that is really the type of output that i am looking for. i tend to like things loud when i watch action movies and i like to be able to reproduce liflike levels of sound. if a bomb goes of in the movie i want it to sound, well , like a bomb went off haha

#8 of 31 Seth_L

Seth_L

    Screenwriter

  • 1,553 posts
  • Join Date: Apr 05 2002

Posted April 15 2004 - 12:55 PM

Why stop at one of them Chris? Posted Image

I am thinking of running 4 AL1804 drivers in two sealed sonotube enclosures with a few KW on them. Posted Image

#9 of 31 Chris Brock

Chris Brock

    Second Unit

  • 328 posts
  • Join Date: Sep 13 2003

Posted April 16 2004 - 12:27 AM

please dont temp me like that. Posted Image Posted Image

but i actually think i will need all the ouput that this will give me. my HT room in my new house will be 19 x 21 x 8 and it is in the basement so all the wall and the floor are concrete.

#10 of 31 Chris Brock

Chris Brock

    Second Unit

  • 328 posts
  • Join Date: Sep 13 2003

Posted April 16 2004 - 05:29 AM

ok well it is done! i placed the order for one 1804 earlier this morning. Maby with some like it might get here next week. Now I have to start planning the enclosure.

I am probebly going to do about a 14 - 15 cube box with 3 4" aero ports tuned to about 16 - 17hz. heavly braced of coursePosted Image

#11 of 31 Bryan Michael

Bryan Michael

    Supporting Actor

  • 564 posts
  • Join Date: Mar 02 2002

Posted April 16 2004 - 05:40 AM

do upi think 3 4 in ports would be enough?
there are olny 2 types of people in the world the irish and thoes who want to be irish

#12 of 31 ThomasW

ThomasW

    Screenwriter

  • 2,282 posts
  • Join Date: Nov 06 1999

Posted April 16 2004 - 05:47 AM

You really need MUCH BIGGER ports for a 18" high excursion driver. Otherwise it's going to be chuffing like mad as the SPLs go up. I'd suggest using a 8" or better yet a 10" port.

Might consider 3-18" PRs, that way the box could be smaller

#13 of 31 Brian-K-Owens

Brian-K-Owens

    Stunt Coordinator

  • 194 posts
  • Join Date: Feb 06 2003

Posted April 16 2004 - 05:50 AM

I used (1) 8" port with mine. You can go to home depot or lowes and they have sonotube in 8" diameters. Worked GREAT for me!!!

That is also what I used in my car enclosure:

Posted Image

Brian
Brian Owens

#14 of 31 Chris Brock

Chris Brock

    Second Unit

  • 328 posts
  • Join Date: Sep 13 2003

Posted April 16 2004 - 06:04 AM

ok if i went with a 10" diameter port it would need to be 47" long to maintain my 16hz tune. the box i am planning is going to he 36" deep. do they even make a 90 degree elbow for 10" tubing? actually what about doing a slot port? I have done alot of those for car audio application but how would that work for HT?

#15 of 31 Brian-K-Owens

Brian-K-Owens

    Stunt Coordinator

  • 194 posts
  • Join Date: Feb 06 2003

Posted April 16 2004 - 06:17 AM

Edit:

I would go with the slot port:
Here is my favorite calculator:

http://www.loudspeak...om/VentCal1.htm

You might try the calculation for 8" port. Like I said, I was running 1000 watts rms to mine, and no port noise unless I was playing around with a sine save at 17 Hz. For normal HT at full volume, no noise.

The XXX is capable of 5.1L of displacement, and I run 1600 watts to it. . .no port noise.

Brian
Brian Owens

#16 of 31 Chris Brock

Chris Brock

    Second Unit

  • 328 posts
  • Join Date: Sep 13 2003

Posted April 16 2004 - 06:41 AM

ok how would this be for a design? 8" x 8" and 38" deep. this would give me a tune of 16hz and a total of 64 sq in of port area.

Posted Image

see any issues with that one?

#17 of 31 Brian-K-Owens

Brian-K-Owens

    Stunt Coordinator

  • 194 posts
  • Join Date: Feb 06 2003

Posted April 16 2004 - 06:45 AM

If it was mine. . .I would go all the way across the bottom and whatever height you need to get the port opening sized correctly.

What are all the dimensions of the box, and what thickness material are you going to build from?

Brian
Brian Owens

#18 of 31 Chris Brock

Chris Brock

    Second Unit

  • 328 posts
  • Join Date: Sep 13 2003

Posted April 16 2004 - 07:02 AM

that is how i have my tempest enclosure built, here it is Posted Image

if i went that route i could go with a vent that was 3 x 22.5. it would give me right at the same amount of port area that the 8 x 8 would have. this would also make the port easier to construct.

#19 of 31 Brian-K-Owens

Brian-K-Owens

    Stunt Coordinator

  • 194 posts
  • Join Date: Feb 06 2003

Posted April 16 2004 - 07:31 AM

That is what I would do, and that is what I will do if I decide to port my Tumults. I actually already have the plans drawn. . .just can't decide if I want to.

Brian
Brian Owens

#20 of 31 Bryan Michael

Bryan Michael

    Supporting Actor

  • 564 posts
  • Join Date: Mar 02 2002

Posted April 16 2004 - 10:57 AM

i would like to upgrave my dual av 15 i can mod the box to fit 18 in it and i can add ports i have 4 4i dual flairs if i wint to 6 or 7 would this be or? i dont think i could add slot ports to the box.
there are olny 2 types of people in the world the irish and thoes who want to be irish