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Author Topic: JTR Speakers "Growler" is Going on a Road Test  (Read 84856 times)

Mark Hobbs

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Re: Evan vs. the Growlers, round 1
« Reply #60 on: December 16, 2007, 12:33:07 AM »

Richard Rajchel wrote on Sat, 15 December 2007 15:19


2 Growlers:

27600 Cubic Inches
~$1800 retail
200 lbs
2000 watts rated
4 Ohms

1 double 18(I picked JBL SRX728s here)

33300 Cubic Inches
~$1400 retail
166 lbs
3200 watts rated
4 Ohms

There should be no doubt that the 2 Growlers should beat the output of the JBLs.



How exactly do you come to that conclusion based on those specs?
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Richard Rajchel

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Re: Evan vs. the Growlers, round 1
« Reply #61 on: December 16, 2007, 05:01:47 AM »

I didn't based on the specs listed. I did by the sensitivity specs on each manufacturers page. JBLs 98 dB 1w/1m according to JBLs data sheet. JTRs are 100 dB 1w/1m according to the specs on their web page.

The key though is that when you use 2 horn loaded cabs together they get a 6dB boost. So instead of 100 dB sensitivity they actually now have 106 dB as a pair.

Using my not-so-trusty brain to figure out that 1000 watts and 106 dB sensitivity comes out to 136 dB. Silly me...there's 2 cabinets, so they actually take 2000 watts...that puts the calculations at 139 dB...sorry about the mistake...it's 4 am.

The JBLs can handle 3200 watts program power, but any only 98 dB sensitivity it comes out to approximately 132 ish dB. I didn't do the exact math, so maybe it's 133, but it's in that neighborhood, and when you take in to account power compression...let's just say that 3200 watts could cook you a pretty thick steak, but 2000 might just cook a hamburger. All that wonderful power from your amps just warms the insides of your speaker cabinets...look here:

http://sound.westhost.com/articles/pwr-vs-eff.htm

edited for my bonehead forgetting that 2 growlers take 2000 watts
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-Richard Rajchel

<a href="http://www.facebook.com/RiaxAudio" target="_blank">Riax Audio</a> - Helping bands sound their best!

Bennett Prescott

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Re: Evan vs. the Growlers, round 1
« Reply #62 on: December 16, 2007, 11:57:56 AM »

Richard Rajchel wrote on Sun, 16 December 2007 05:01

The key though is that when you use 2 horn loaded cabs together they get a 6dB boost. So instead of 100 dB sensitivity they actually now have 106 dB as a pair.

When you use ANY two cabinets together, within 1/4 wavelength of each other, and you also apply the same power to both of them, you get a 6dB increase in SPL. 3dB is from cabinet coupling, 3dB is from doubling the power (if you had an 8 ohm sub connected to an amplifier capable of delivering 1000 watts at 8 ohms, and you connect another identical sub to the same amp channel, the amplifier now provides 2000 watts into what is now a 4 ohm load to be "shared" by both subwoofers, so each still gets 1000 watts).
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-- Bennett Prescott
Director of North American Sales
ADRaudio d.o.o.
Cell: (518) 488-7190

"Give me 6dB and I shall move the world." -Archimedes

Mark Hobbs

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Re: Evan vs. the Growlers, round 1
« Reply #63 on: December 16, 2007, 02:59:40 PM »

Richard Rajchel wrote on Sun, 16 December 2007 04:01

I didn't based on the specs listed.


Let me get this straight....you list THOSE specs and make THAT statement yet the specs you listed have nothing to do with the statement you made.
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Richard Rajchel

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Re: Evan vs. the Growlers, round 1
« Reply #64 on: December 16, 2007, 05:00:50 PM »

Bennett is correct. So 133 dB ish vs 133 dB ish. The 2 growlers are still significantly smaller in size than the JBLs and also take 2000 watts to do what it takes 3200 watts for the JBLs.

Of course without hearing them it's impossible to say which "sounds" better. My point was more to compare similar setups. It's silly to compare something more than twice the size that takes 50% more power to the Growler is all.

If Evan would normally use 2 of his QW218s that seems to me it would be a normal gig for 4 Growlers, and would likely be at least as loud using less power and a smaller size overall. The QWs have very similar stats to the JBLs I used for an example(99 dB sensitivity and 3200 watts program power)

For Mark's peace of mind here are the corresponding specs.

http://www.jblpro.com/srx700/PDF/JBL.SRX728S.pdf

http://www.jtrspeakers.com/growler.html

Next time I will be sure to include full documentation for your reading pleasure.

Edit for spelling...
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-Richard Rajchel

<a href="http://www.facebook.com/RiaxAudio" target="_blank">Riax Audio</a> - Helping bands sound their best!

Jeff Permanian

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Re: Evan vs. the Growlers, round 1
« Reply #65 on: December 20, 2007, 11:17:45 PM »

So, who wound up with the growlers after the shootout?
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Evan Kirkendall

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Re: Evan vs. the Growlers, round 1
« Reply #66 on: December 21, 2007, 12:16:09 AM »

Jeff Permanian wrote on Thu, 20 December 2007 23:17

So, who wound up with the growlers after the shootout?


They are sitting in Jim's shop currently.

Oh, and sorry I never called you back. I deleted your message and lost the paper where I wrote your number down. Sorry! Very Happy




Evan
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Not all change is good change.

Josh Oswald

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Re: Evan vs. the Growlers, round 1
« Reply #67 on: December 21, 2007, 12:17:09 AM »

Not me. Sad
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Evangel Temple Church
Montgomery, Alabama

Jeff Permanian

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Re: Evan vs. the Growlers, round 1
« Reply #68 on: January 04, 2008, 04:14:04 PM »

Jim Bowersox has them, will put them through a few gigs, give them a writeup and then on to the next Road Tester.
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Brad Gibson

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Re: Evan vs. the Growlers, round 1
« Reply #69 on: January 07, 2008, 10:29:10 PM »

If they come thru south Georgia I would love to tell you what I think of them.  I will even do a small shoot out with my 728's.
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