DIY Dual 15's for Live sound - AVS Forum
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post #1 of 15 Old 04-01-2014, 04:43 PM - Thread Starter
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So this has probably been asked before, but I want to build my own subwooofers for live sound gigs and I have some 15" drivers that I would like to use. I don't know the specs on one pair, but I have a model for the other pair. I don't really mind size as long as they are LOUD, can both fit in the back of a Toyota Highlander and not more expensive than 6 sheets of ply. I already have some experience building cabs as I have built a pair of Bill Fitzmaurice Tuba 30's. I use them for DJ'ing but they aren't meant for live sound. Most of my gigs are outside but I definitely do inside gigs as well. I don't want a very intricate design, something like a simple reflex cabinet would do. Thanks for any ideas!

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post #2 of 15 Old 04-01-2014, 05:11 PM
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Without the T/S Specs it's a guess.
Most woofers built for pro sound trade off the LF extension for higher SPL, so they would be unsuitable as subwoofers.
On the other hand woofers designed for sub use trade off SPL for LF extension

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post #3 of 15 Old 04-09-2014, 05:16 PM - Thread Starter
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I don't know the specs on the one pair but I could probably look them up for the other pair. Also, what is the Hz range that a kick drum's loudest frequency is in? I should know this but I can't remember. Thanks! I don't plan on using these for very low frequencies, probably nothing below 60 Hz realistically, maybe even higher than that.

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post #4 of 15 Old 04-09-2014, 05:26 PM
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Also, what is the Hz range that a kick drum's loudest frequency is in?
That can be a matter of taste but many tweak from around 50 - 80 Hz.
Different spectrum analysis indicate up to 100 Hz

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post #5 of 15 Old 04-09-2014, 05:35 PM - Thread Starter
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Ok, the reason I ask is because the main reason I'm building the subs is for live sound and the low end of that. I used my Tuba 30's for a gig one time and when I was playing music they sounded great but when I transitioned to live sound I lost most of my bottom end. Would putting one of each of these "unknown" drivers in each cabinet and tuning it for around 65 Hz sound absolutely terrible? I'm not looking for the most high quality sound, just as long as it can cover 400~500 people. Thanks

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post #6 of 15 Old 04-09-2014, 05:41 PM
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How would you tune it to 65hz without the parameters?
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post #7 of 15 Old 04-09-2014, 05:43 PM - Thread Starter
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True, didn't think about that! Thanks for catching that.

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post #8 of 15 Old 04-09-2014, 06:05 PM
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Well...
( See post 2 ) otherwise
Ya could measure them. smile.gif

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post #9 of 15 Old 04-09-2014, 06:34 PM - Thread Starter
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How should I go about measuring the T/S specs?

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post #10 of 15 Old 04-09-2014, 06:46 PM
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http://sound.westhost.com/tsp.htm
http://www.webervst.com/spkrcalc/para.htm
http://www.bcae1.com/spboxad3.htm

http://www.mcmelectronics.com/product/72-850?scode=GS401&CAWELAID=220586442&cagpspn=pla&gclid=CJjC27Pm1L0CFecWMgoddGcA9w
http://www.woofertester.com/wt2product.htm

http://www.claudionegro.com/

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post #11 of 15 Old 04-09-2014, 07:27 PM
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Quote:
Originally Posted by MacTheSoundGuy View Post

I used my Tuba 30's for a gig one time and when I was playing music they sounded great but when I transitioned to live sound I lost most of my bottom end.
You didn't lose anything because of the subs. T30s are used by hundreds of live sound providers with zero issues. If you didn't get the same result with a live feed as you did with recorded media it's because the live signal didn't have the same low end content as the recordings. That would have been the result of how the sound was mixed.

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post #12 of 15 Old 04-09-2014, 08:02 PM
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lol
Uh-Oh Mac; - You're on the Yo-dar screen tongue.gif

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post #13 of 15 Old 04-09-2014, 09:54 PM - Thread Starter
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Originally Posted by Bill Fitzmaurice View Post


You didn't lose anything because of the subs. T30s are used by hundreds of live sound providers with zero issues. If you didn't get the same result with a live feed as you did with recorded media it's because the live signal didn't have the same low end content as the recordings. That would have been the result of how the sound was mixed.

True. It may also be that I had much higher expectations for the low end that I was getting with only 2. I love the design by the way, they sound amazing!

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post #14 of 15 Old 04-09-2014, 09:54 PM - Thread Starter
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Yep, I have a feeling I am a bit of a nag to Bill. I apologize about that. 

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post #15 of 15 Old 04-10-2014, 05:32 AM
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Quote:
Originally Posted by MacTheSoundGuy View Post

Yep, I have a feeling I am a bit of a nag to Bill. I apologize about that. 
No problem. Just keep in mind that the T30s can only reproduce what you put into them, so if they're not cranking out the lows with a live source to the same extent they do with a recorded source then the live source simply doesn't have the right EQ and/or mix. A dozen or so live sound pros who are regulars on my forum will give you advise on how to get the most out of your rig. All of them will also tell you to forget about using 2x15 tops.

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