please Help me build a new sub around the dayton quatro 15 - diyAudio
Go Back   Home > Forums > Loudspeakers > Subwoofers

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 23rd January 2005, 08:12 AM   #1
diyAudio Member
 
Join Date: Jan 2005
Location: Thousand Oaks, ca
Send a message via AIM to VisionxOrb
Default please Help me build a new sub around the dayton quatro 15

Ive searched and read through quite a few threads but I need a more specific awnser for my use. I want to build new subs using 2 dayton quatro 15s, I have a BGW professional 750D amp ( about 300 rms x2 at 4 ohm, stable to 2ohm ) amp that Im going to use. My room is about a little odd shaped, its about 25ft long and 20 ft wide at the front but after about 15 from the front it goes down to say 15 ft wide ( i guess looking down on the room it looks like a boot ). and 8ft celings, its got couch, some chairs 2 window but its not open to any other room.

I mainly use it for movies, like to be blown away but I also what them to be musical. Now ive always that the flatest responce was that you wanted as low as u could go but reading here im thinking maybe with room gain might be to much? also I was thinking of building a ported box tuned to 20hz ( 2 spereate boxes unless theres any advantage for 2 woofers in 1 box )

But what about tuning lower? higher? sealed? Im not sure how to build it for what I want to achevie so I thought Id ask the people here.
  Reply With Quote
Old 23rd January 2005, 02:02 PM   #2
diyAudio Member
 
Join Date: Jan 2005
Location: Kaiserslautern, Germany
Send a message via AIM to weikertball Send a message via MSN to weikertball
20hz should be fine for music and theatre. I'm getting to run 2 Quatro 15's in my vehicle, 11-11.25 cubes tuned to around 21 or 22 hz I read someone had a huge box tuned to 11 hz? It should sound nice, Quatros are great subs.
  Reply With Quote
Old 23rd January 2005, 04:37 PM   #3
diyAudio Member
 
Join Date: Oct 2004
Location: t-dot, canada
Send a message via MSN to xstephanx
if you DO tune to 20hz, i think you will have a large housecurve, and im mean large. you want to tune a box so that it "matches" room gain. In other words, tune it so that the slope of the box matches how much gain the room gives you, thus providing the flattest response. Tuning lower also lowers Groud delay, which increases the entire systems transient response(from what I've heard). Now some people also like a large house curve, and thats fine, but you need to find out what you want before everything is finalised.

Im not sure what teh formula for room gain is, i think room gain starts at the wavelength that matches the rooms longest dimension, but i could be wrong.

Also the man who tuned his box to 11hz is aaron gilbert, or "aaroncgi"(not sure on that one) on diy audio. He has some in room measurements for his one quatro in 9 cu ft tuned to 11hz, they were impressive to say the least.
__________________
CREEEAAAAAMMMMM CHEEEEEESSSSSSEEEEEEE!!!!!
EEEEESSSSEEEEEEHC MMMMMAAAAAEEEERRCCC!!!!
  Reply With Quote
Old 24th January 2005, 05:20 PM   #4
diyAudio Member
 
Join Date: Jan 2005
Location: Thousand Oaks, ca
Send a message via AIM to VisionxOrb
ok, ill see if i can find the formula for room gain and see about building a box to match and tune low.

Ive got another question since I noticed the thread about the elemental designs 16kv.2, since right now its 10% off for 2 PLUS free shippinhg its comes to 63 dollers more for both than the quatro, now I know theres more to subs than xmax but its a 16.1 vs 10 for the quatro and it got compared to the tempest which I know is a good sub for the house, so would this be a better way to go?

for those that didnt read the thread heres the specs on the subs

SPECS:
Qts .32
Qms 3.60
Qes .35
Re 3.7
Vas (Liter) 329.00
Sd (cm^2) 840
Fs (Hz) 19.9
Bl 16.00
MMd 179.00
MMs 193.00
Xmax 16.1mm
  Reply With Quote
Old 24th January 2005, 06:47 PM   #5
diyAudio Member
 
Join Date: Oct 2004
Location: t-dot, canada
Send a message via MSN to xstephanx
ive seen the specs, and IN WIN ISD** they model very close to a tempest, but in a smaller box. Unfortunately winisd and real life are two very different places. But if i were you, i would go for the elemental designs woofers. Im a fan of infrasound which requires displacement, and given eDs reputation, they must have relatively good SQ as well as some serious SPL capabilities. Im just sad i didn't read about them before i ordered my (broken) tempest.

try modeling an EBS alignment for the eD.
__________________
CREEEAAAAAMMMMM CHEEEEEESSSSSSEEEEEEE!!!!!
EEEEESSSSEEEEEEHC MMMMMAAAAAEEEERRCCC!!!!
  Reply With Quote
Old 26th January 2005, 09:25 PM   #6
diyAudio Member
 
Join Date: Nov 2002
Location: Bonney Lake, WA
Default Plenty of options.

I'm the one with the 9 cubic foot box tuned to 11 Hz. Two Quatros with 300W each will definitely get into the 'blow you away' range, though granted, that depends how you define it. I feel pretty blown away myself with just one, but some real bass heads won't settle for less than several Adire Tumults or a Parthenon, etc..

As for most musical, sealed or infinite baffle are great ways to go. Sealed still gets you pretty good low extension, and a considerably smaller box, but power handling and maximum output is not as high. However, it is possible to make a vented box yet maintain very close to all of the sound quality of a sealed box. I have tried my box sealed, and other than the better low end extension of the vented box, I can't tell the difference between them. Note that tuning to 11 Hz does make the power handling very very similar to a sealed box, but the woofer is much less likely to 'unload' because there's so little information below 11 Hz. Power handling is still higher than it would be sealed, though.

Anyhow, not to get too in depth, it's all just a matter of compromises, so pick your poison. I like vented because by altering the tuning frequency, you can match the rolloff slope (above the tuning point, that is) to better complement the inherent gain in your room. With sealed, you are more or less stuck with the F3 and rolloff point the driver gives you.

As was mentioned, tuning to 20 Hz may give you some extra boost that you might not want, due to the room gain. My sub is down 6 dB at 20 Hz (simulated anyhow), and even this sounds like a bit too much low end output at times.


Aaron Gilbert
  Reply With Quote
Old 26th January 2005, 11:39 PM   #7
diyAudio Member
 
Join Date: Oct 2004
Location: t-dot, canada
Send a message via MSN to xstephanx
aaron i wouldnt be surprised if you had a serious house curve going on, the rol off onthat box is a little shallow for the average sized room(though it would suit my tastes fine).
__________________
CREEEAAAAAMMMMM CHEEEEEESSSSSSEEEEEEE!!!!!
EEEEESSSSEEEEEEHC MMMMMAAAAAEEEERRCCC!!!!
  Reply With Quote
Old 27th January 2005, 01:59 AM   #8
diyAudio Member
 
Join Date: Nov 2002
Location: Bonney Lake, WA
Default Well, technically speaking...

Everyone has a house curve. I presume you are meaning that coupled with my house curve, the rolloff off my subwoofer will lead to a response that has an elevated lower end, say 10-40 Hz. You may be right. At times, it does seem like there is too much bass at certain frequencies. I do run all speakers except the center as large however, and the other speakers don't have the extension of the subwoofer, so the problem, if there, is mitigated somewhat. That said, a LOT of people tend to design for an F3 point of 20 Hz or even below, so they must have a far more boosted low end than I do (given similar rooms)!


Aaron Gilbert
  Reply With Quote
Old 27th January 2005, 02:51 AM   #9
simon5 is offline simon5  Canada
diyAudio Member
 
Join Date: Nov 2004
Location: Québec, Québec
You have a single Quatro 15 in a 9 cu.ft. box tuned to 11 Hz?

I think it's very well designed and the room curve is perfect to bring it flat if you have a normal sized room.

Even Adire Audio uses a shallower curve to predict room gain.
__________________
DIYaudio for President !
  Reply With Quote
Old 27th January 2005, 06:45 AM   #10
diyAudio Member
 
Join Date: Jan 2005
Location: Thousand Oaks, ca
Send a message via AIM to VisionxOrb
I was playing around with winISD a lil, although im not great with it as it took me forever to get the elemental designs specs in since i needed it to auto calc half of them so it would let me save.

any i modeled a QB3 box as it sounded like the simplest vented encloures because i dont know what a EB stuff is. any way I modled a box that was 14cf tuned to 14 that looks like it would work well factoring in room gain but i dunno.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
My build of ZaphAudio 2 cu.ft Dayton RSS 12" HF Sealed Sub Choots Subwoofers 36 24th January 2011 12:22 PM
(2x) Dayton QT385-4 15" Quatro's in my trunk rocko1290 Car Audio 7 28th August 2006 02:13 AM
Dayton III group build? Tim K Multi-Way 0 18th April 2005 03:33 AM
dayton quatro sonosub xstephanx Subwoofers 14 25th November 2004 03:13 AM
PE Quatro 15" Sub jjdche Multi-Way 2 16th June 2004 05:06 PM


New To Site? Need Help?

All times are GMT. The time now is 07:15 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2