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post #121 of 167 Old 09-06-2010, 03:18 PM
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Mines an ugly front loaded horn. Goes to show you what can be done with some cheap material and a lot of thinnin! But it is proving to be very tough to measure ultimate SPL with. I'm sticcking with the sims as they have held true up to now. 200 watts and almost 120db at 18 hz. Other than size this is a keeper if you have the room.

http://www.avsforum.com/avs-vb/showthread.php?t=1258205

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http://s407.photobucket.com/albums/p...n%20Subwoofer/

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post #122 of 167 Old 09-18-2010, 12:35 AM - Thread Starter
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i'm a little surprised that your driver hold up this high of c.r.

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post #123 of 167 Old 09-18-2010, 05:42 AM
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Here is a comparison between my design and a very good design by Bill Fitzmaurice.

Tell me what you think about appropriate compression ratios. I'll tell you that an appropriate compression ratio begins at 1:4 and yes it is very driver dependant. As it is location dependant. A 4:1 compression ratio is hard on a driver in Pro sound applications. At home the driver will hardly be worked out when you average peaks to steady state volume.

Have you looked at a TRIO12 inorder to comment on the integrity of the cone?

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post #124 of 167 Old 09-18-2010, 12:54 PM - Thread Starter
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is there a rule of thumb that relates the limit of compression ratios, excursion, power, etc.? i.e. do you happen to know what aspect of high compression ratios it is that destroys drivers?

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post #125 of 167 Old 09-18-2010, 12:56 PM - Thread Starter
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"Have you looked at a TRIO12 inorder to comment on the integrity of the cone?"

i have not.

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post #126 of 167 Old 09-18-2010, 02:32 PM
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Back from working on my barn. Little barn but still needs to be built!

Quote:


is there a rule of thumb that relates the limit of compression ratios, excursion, power, etc.? i.e. do you happen to know what aspect of high compression ratios it is that destroys drivers?

It's a black art!

Well short story I try to keep things less then 5:1. If you go with a much greater compression ratio you end up putting enormous stress on the driver.

That said you have to pick a driver with a cone that can take the pressure of a horn in the first place. Musical instrument drivers are usuallu light cones that will not like horn loading. So you are looking for a driver with a decent moving mass and a demonstrably heavy enough cone to take the beats!

The TRIO12 is a great driver in this regard. There are quite a few other drivers that will work. The problem is that the combination of high X-max decent sensitivity and suitability to horn loading are not traits found in a great deal of 12" drivers.

Quote:


"Have you looked at a TRIO12 inorder to comment on the integrity of the cone?"

i have not.

I take it you have a killer system as is?

If you don't the TRIO12 is a good driver in it's class of 12" drivers. It competes head to head with most and beats a great many of them. I've been modeling it for almost a year. And messing with it for about 8 months. Hard driver to find the equal of it I'd say.

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post #127 of 167 Old 09-22-2010, 01:13 AM
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Any chance I can get my build added to the list?

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post #128 of 167 Old 09-23-2010, 05:38 PM - Thread Starter
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nice build. added!

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post #129 of 167 Old 09-27-2010, 01:12 AM
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Thank you!

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post #130 of 167 Old 09-28-2010, 10:29 PM - Thread Starter
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just needs a little more bracing... ;-)

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post #131 of 167 Old 11-06-2010, 03:28 AM
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My subs are two 90 liter aperiodically vented cabinets with NHT 1259s. I know that the drivers are old, I bought them between ten and fifteen years ago while the cabinets are even older, more than twenty five years old. They are powered by 300 watts to each. They really pump out the air with a boost at 20Hz. The air pressure changes dramatically and things sometimes start rattling. I don't plan on replacing them but do need to repaint the cabinets.
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post #132 of 167 Old 11-06-2010, 08:35 PM
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Quote:
Originally Posted by Theresa View Post

My subs are two 90 liter aperiodically vented cabinets with NHT 1259s. I know that the drivers are old, I bought them between ten and fifteen years ago while the cabinets are even older, more than twenty five years old. They are powered by 300 watts to each. They really pump out the air with a boost at 20Hz. The air pressure changes dramatically and things sometimes start rattling. I don't plan on replacing them but do need to repaint the cabinets.

I had a set of 1259's in sealed enclosure, funny enough I use to run bridged Ashly Fet-200, about 300watts each.

Great subs...
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post #133 of 167 Old 11-22-2010, 05:16 PM - Thread Starter
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"My subs are two 90 liter aperiodically vented cabinets with NHT 1259s."

got a build thread? i can add it to the list...

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post #134 of 167 Old 12-04-2010, 04:08 PM
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Quote:
Originally Posted by LTD02 View Post

just needs a little more bracing... ;-)

I will be adding some bracing very soon, and it will be documented in my build log. I have already added sound deadening throughout the entire interior of the enclosure, and since doubled the power going to the subs. They just keep getting better and better.

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post #135 of 167 Old 12-04-2010, 04:39 PM - Thread Starter
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;-)

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post #136 of 167 Old 01-25-2011, 05:11 PM
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Should this "master index" be sorted by enclosure type?

sealed
vented
flh
tapped
bandpass
ib
etc

?

"The boom is dead, long live the bass"
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post #137 of 167 Old 01-25-2011, 09:00 PM - Thread Starter
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i went back and forth on that...and no solution jumped out as the right one...so i tried to include words that will pop up if someone does a search. i'm sure the future web will have a way, but for now we are in the stone age. :-)

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post #138 of 167 Old 01-25-2011, 09:13 PM
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Quote:
Originally Posted by LTD02 View Post

i went back and forth on that...and no solution jumped out as the right one...so i tried to include words that will pop up if someone does a search. i'm sure the future web will have a way, but for now we are in the stone age. :-)

I don't understand?
If you have text that indicate what each build is (sealed vs. ported, etc), then why not just list them in that order?

Do people send their build thread links to you or do you just scavenge them up?

It's your thread, you decided to make a fuss over doing it and making it a sticky. At least do it proper.

If you aren't sure what some or most of them are, then just list those as "unsorted" or something.

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post #139 of 167 Old 01-25-2011, 09:19 PM - Thread Starter
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some folks wanted to sort on spl capability.

some folks wanted to sort on size.

some folks wanted to sort on drivers.

some folks wanted to sort on cost.

some folks wanted to sort on design.

there isn't a simple way to slice it, or i would have. :-) the future web will take care of all of this, but we aren't there yet.

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post #140 of 167 Old 01-26-2011, 07:57 AM
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Quote:
Originally Posted by LTD02 View Post

some folks wanted to sort on spl capability.

some folks wanted to sort on size.

some folks wanted to sort on drivers.

some folks wanted to sort on cost.

some folks wanted to sort on design.

there isn't a simple way to slice it, or i would have. :-) the future web will take care of all of this, but we aren't there yet.

That sounds like it's you who's talking and not "some folks".

I searched the thread and nobody has requested anything be sorted in any manner other than alignment?

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post #141 of 167 Old 01-26-2011, 10:22 AM
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If I were to go thru all the trouble, I'd just keep it real simple. Sealed, Vented/PR, and other.

Obviously...It's up to you, LTD. Your thread, your time.

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post #142 of 167 Old 01-28-2011, 06:14 PM
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That's a no win, but it would be nice to have some criteria for indexing/sorting.

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post #143 of 167 Old 02-11-2011, 01:17 PM
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post #144 of 167 Old 05-26-2011, 11:24 AM
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you saved me alot of time of searching!
how much time it took to collect this list?
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post #145 of 167 Old 05-26-2011, 03:06 PM - Thread Starter
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"you saved me alot of time of searching!
how much time it took to collect this list?"

i have no idea. many people have performed a lot of work here and elsewhere that helped me out. it seemed like it would be useful resource for somebody who was new to kind of get a perspective on what others have done and why.

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post #146 of 167 Old 07-13-2011, 07:14 PM
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Quote:
Originally Posted by LTD02 View Post

"you saved me alot of time of searching!
how much time it took to collect this list?"

i have no idea. many people have performed a lot of work here and elsewhere that helped me out. it seemed like it would be useful resource for somebody who was new to kind of get a perspective on what others have done and why.

Reserved
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post #147 of 167 Old 08-19-2011, 06:04 PM
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None of the MFW projects made the list?

Wembley's dual opposed design was pretty nice.....

http://www.avsforum.com/avs-vb/showt...319489&page=11

Don't waste time reading signatures.....
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post #148 of 167 Old 08-20-2011, 07:43 PM - Thread Starter
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i just haven't updated it in a while.

if you see something that should be on the list, just shoot me a pm and i'll try to get to them all.

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post #149 of 167 Old 02-08-2012, 02:42 PM
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hello,
I saw this project many times and it is missing on you list
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post #150 of 167 Old 02-13-2012, 10:31 AM
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You can add mine to the list as well: CSS TRIO12 with 2 x 12" Passive Radiators : http://www.hometheatershack.com/foru...-trio12-h.html

HT: Yamaha RX-V565 | 3 X Energy Take FPS, 2 X VS Surround, 2 X Take LCR | DIY Subs: SDX12 APR15 & TRIO12 Dual APR 12's | 47" LCD

Music: Yamaha RX-V863 | 2 X Energy RC-70 | MA RXw12 Sub

Bathroom: 2 X Energy Take LCR

Car: Sony Xplod HU, Xplod 6X9s, Kenwood 4"s, Alpine 12" Type-S, Rockford Amp,...

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