lets bring back sub testing - Page 4 - AVS Forum
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post #91 of 479 Old 11-29-2010, 12:12 PM
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No worries, thanks in advance for reviving the sub testing, it's a lot of work.
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post #92 of 479 Old 02-04-2011, 10:33 PM
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The site appears to be live now, so maybe Ricci will start a thread over the weekend.

I have a question about what procedure was used to set the 1W voltage with the 61-702 DMM.

Gotta get the ball rolling, right?
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post #93 of 479 Old 02-04-2011, 11:30 PM
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There is a lot of good stuff there. I really like the Drivers section idea, and adding the HR simulation data.

It is also nice to read through a Bass Myths section, and not have to stop part way through from laughing. I cringe whenever I see Mass/Compliance controlled talk comes up, but it was handled well here. With the mobile crowd it comes up a lot, and it normally get blow out of perspective, or is just handle wrong.
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post #94 of 479 Old 02-04-2011, 11:49 PM
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very similar to the old audiopulse "myths" page. good stuff.

the audiopulse myths page lives on in the web archive even though audiopulse is now gone.

http://web.archive.org/web/200804160...ut-subwoofers/

Listen. It's All Good.
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post #95 of 479 Old 02-05-2011, 06:11 AM
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Quote:
Originally Posted by soho54 View Post

The site appears to be live now, so maybe Ricci will start a thread over the weekend.

I have a question about what procedure was used to set the 1W voltage with the 61-702 DMM.

Gotta get the ball rolling, right?

web address?
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post #96 of 479 Old 02-05-2011, 08:25 AM
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Quote:
Originally Posted by soho54 View Post

The site appears to be live now, so maybe Ricci will start a thread over the weekend.

I have a question about what procedure was used to set the 1W voltage with the 61-702 DMM.

Gotta get the ball rolling, right?

Yep. What do you want to know? I used the measured impedance minimum in the 10-120hz range to calculate the voltage needed for 1w into it. Then using a 60hz sine wave into the cab I would measure the voltage with the dmm and use the dcx to adjust the amplifier output sine it has the very fine 0.1 db adjustment. To get the voltage as close as I could. It is not perfect by any means so there is some amount of tolerance in there. If anything the voltage used was a little bit low because one thing I forgot to do was factor in the cable resistance. (50ft 12ga)



http://www.data-bass.com/blog
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post #97 of 479 Old 02-05-2011, 09:43 AM - Thread Starter
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Quote:
Originally Posted by Ricci View Post


Yep. What do you want to know? I used the measured impedance minimum in the 10-120hz range to calculate the voltage needed for 1w into it. Then using a 60hz sine wave into the cab I would measure the voltage with the dmm and use the dcx to adjust the amplifier output sine it has the very fine 0.1 db adjustment. To get the voltage as close as I could. It is not perfect by any means so there is some amount of tolerance in there. If anything the voltage used was a little bit low because one thing I forgot to do was factor in the cable resistance. (50ft 12ga)

http://www.data-bass.com/blog

Very good info on there josh. Looks like your ported xxx has a very good and linear frequency response overall. Surprised to see how well the dts-10 did stock vs the dual 21's. Really speaks volumes about the advantages of the tapped horn alignment.
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post #98 of 479 Old 02-05-2011, 10:19 AM
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Ricci, very good work. I like that your measurements are quite extensive. Using 10hz-100hz should more than cover the sub's operating range.

I did notice that your ported 21SW152 has quite a bit more SPL levels than your dual 21SW152. It seems to me that those measurements should be flipped around, no?

Hopefully people will send you drivers to test and it's good that someone like yourself can test subs since it has not been done since Ikka left.

A couple of questions. When testing dual subs, was just one Crest 8002 used? I did not see enclosure size used for the testing as I read your thread, do you have that info? If people send you drivers for test, besides sealed, can you also test them in ported/PR configurations. Finally, people would just have to pay shipping both ways and you do the measurements and put them in your chart? Thanks.
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post #99 of 479 Old 02-05-2011, 11:20 AM
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I love the site Ricci!!!!! Easy to navigate and seems well thought out. Looking forward to seeing future measurements and designs. Can't wait.
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post #100 of 479 Old 02-05-2011, 12:06 PM
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Thanks guys...I can't take credit for the site that would be Kyle for the most part.

Spanish68. Most of your questions about the dual 21 are answered on the site if you read the notes, etc. It was severely amp limited. The electrical line would not support 2 8002's and full out sine wave testing. I have new amps and will be getting a 240v line so we wont have power problems again. We are also going to avoid testing dual driver passive subs if possible. Obviously some will still happen but we should have more than enough power. There will be some changes in the next round of tests already. Its a learn as you go type thing. More details later.

As far as sending stuff in to be tested...Yeah this is completely non-profit so its just shipping costs. It should be noted that we won't be reponsible if something gets damaged either in shipping or during testing though. I have a pretty good track record for not damaging subs but there is always a possibility. Anyway it will be probably May before we get a new set of tests.
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post #101 of 479 Old 02-05-2011, 12:25 PM
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Nice job on the data and site Ricci !!!
Anyone close to you have a Mal-x you could measure, seems a popular choice... It'd be nice to see the 18 & 21 both tested.

I got an 18, just need to repair the small tear in the surround.
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post #102 of 479 Old 02-05-2011, 01:33 PM
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Well I guess thanks are in order for Kyle as well as Ricci then...... I look forward to checking the site out often.
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post #103 of 479 Old 02-05-2011, 01:53 PM
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Quote:
Originally Posted by Warpdrv View Post

Anyone close to you have a Mal-x you could measure, seems a popular choice... It'd be nice to see the 18 & 21 both tested.

I got an 18, just need to repair the small tear in the surround.

They are on wishlist...It is a big list! Maybe I will hit you up when the time is right.
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post #104 of 479 Old 02-05-2011, 01:54 PM
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Quote:
Originally Posted by Ricci View Post

Yep. What do you want to know?

That was good, but what I was looking for was the fact that while the meter is not a TrueRMS DMM, it's Average responding measurement has been altered to equal RMS, by calibration to Sine Wave.

There was some confusion on another site about TrueRMS and Average readings, and why all their 2.83v DMM readings were not really 2.83v RMS, but 3.14v RMS.
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post #105 of 479 Old 02-05-2011, 02:00 PM
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So I passed that part of the exam Soho? It is not easy to keep track of all of the details...
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post #106 of 479 Old 02-05-2011, 02:09 PM
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Yeah, the 61-702 is "Average responding, RMS calibrated to a Sine Wave."
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post #107 of 479 Old 02-05-2011, 02:21 PM
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Dude! Josh... you .... you're the man. *virtual handshake*

I can't enough of what's already been said. Great work, my friend. You put a lot of work into this. Thank you.

My Dual 18" LLT subs 120dB down to 10hz

 

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post #108 of 479 Old 02-05-2011, 03:20 PM
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Looks like LLT for the win. Nice work.
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post #109 of 479 Old 02-05-2011, 05:25 PM
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Ricci, I'm guessing that you're going to test both commercial and DIY subs. Whaterver you can get your hands on, right?
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post #110 of 479 Old 02-05-2011, 07:46 PM
 
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Quote:
Originally Posted by Warpdrv View Post

Nice job on the data and site Ricci !!!
Anyone close to you have a Mal-x you could measure, seems a popular choice... It'd be nice to see the 18 & 21 both tested.

I got an 18, just need to repair the small tear in the surround.

I have a Mael.-x in 6CF sealed, but I can't afford to replace it right now if anything happened to it.
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post #111 of 479 Old 02-05-2011, 08:27 PM
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Originally Posted by mjg100 View Post

I have a Mael.-x in 6CF sealed, but I can't afford to replace it right now if anything happened to it.

Yeah, I'm thinking it would be much cheaper if just the driver was sent - he has those test boxes and could swap out an 18" pretty much trouble free at this point... Not sure if those test boxes are adjustable in internal area - but that would be a cool feature....

My Boxes were the same - 24" cubes, but I'm not about to try and ship a box that size, that would be a silly cost, when I still have the ship box for the Mal-X....

Plus I saw what Ricci did to the last box I gave him - not sure I could endure that torture again.....
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post #112 of 479 Old 02-05-2011, 09:22 PM
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Nice work dude.

Maybe I missed it, but do you mention the window settings used for all of the frequency response and waterfall plots?

-Mike Bentz
~It's all about compromise~
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post #113 of 479 Old 02-05-2011, 09:34 PM
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Great work Ricci! I think testing independently is invaluable, especially when it is done with such rigour. Really appreciated!!!

explore the music
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post #114 of 479 Old 02-05-2011, 09:49 PM
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excellent work, has anyone stepped forward with a front loaded horn at all?
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post #115 of 479 Old 02-05-2011, 10:24 PM
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Ricci, I still have two unused Sound Splinter RLp18d4's that are in their original shipping boxes if you would be interested in testing them. I know I sure as hell do! You would definitely need an appropriate cab for each though. Maybe your ported XXX cab for a single vented test but for sealed, probably nothing smaller than 5-6cuft per driver. I'd be happy to make a donation (both driver and $$$) for the cause though.

My Dual 18" LLT subs 120dB down to 10hz

 

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post #116 of 479 Old 02-05-2011, 11:36 PM
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Thanks for the support! Josh has worked really hard to provide accurate measurements and while we only have 9 systems tested, we hope to add many more. The site is designed with an backend database so we can easily add more systems and the charts will change on their own. We may add more tools for comparisons once we get a longer list. I can't take credit for the idea or the testing, that's all Josh, I'm just here to make sure the data gets presented well.

The myths section was revised and shorted to just touch on the common things that come up often. We hope to add more sections and information, bring in more articles and reviews that make sense for the site. We also hope to bring some car audio woofers to the table and perhaps even some spl testing for such woofers.

The front page was not set up, its fixed now www.data-bass.com refers you to the system chart. Enjoy!

data-bass.com
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post #117 of 479 Old 02-06-2011, 04:40 AM
 
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Quote:
Originally Posted by Warpdrv View Post

Yeah, I'm thinking it would be much cheaper if just the driver was sent - he has those test boxes and could swap out an 18" pretty much trouble free at this point... Not sure if those test boxes are adjustable in internal area - but that would be a cool feature....

My Boxes were the same - 24" cubes, but I'm not about to try and ship a box that size, that would be a silly cost, when I still have the ship box for the Mal-X....

Plus I saw what Ricci did to the last box I gave him - not sure I could endure that torture again.....

Oh, I would not send. I get up to Louisville all the time. I would just bring the sub or driver with me.
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post #118 of 479 Old 02-06-2011, 07:04 AM
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Ahhh gotcha... Thats they way buddy....


Kyle, great work on the website.... turned out very nicely and is quite intuitive...
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post #119 of 479 Old 02-06-2011, 09:11 AM
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Great work guys and nice website. Thanks for putting all that effort together to do this for the DIY community.

Just curious, since this is just the beta website, will you also have a section with graphs? I'm very interested to see some frequency response plots, distortion measurements, group delay chart, etc.
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post #120 of 479 Old 02-06-2011, 09:25 AM
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Quote:
Originally Posted by NateTTU View Post

Great work guys and nice website. Thanks for putting all that effort together to do this for the DIY community.

Just curious, since this is just the beta website, will you also have a section with graphs? I'm very interested to see some frequency response plots, distortion measurements, group delay chart, etc.

Click on each system (subwoofer) and you will find all the graphs. It took me a little while to realize they were there, too.
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