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Author Topic: JBL PRX615m and PRX618s-xlf  (Read 8941 times)

Chris dePaola

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JBL PRX615m and PRX618s-xlf
« on: May 20, 2011, 01:40:26 pm »

So I'm about to pull the trigger on two of the JBL PRX615m's and PRX618s-xlf's and just wanted last minute input, pro's and con's.

These are for my outdoor movie company and I'll eventually be adding two more subs and up to four more mains, just don't have that kind of cash for an all at once purchase.

I've been running Mackie SRM450's and while they have worked fine I have had some minor issues with them clipping out on really dynamic potions of movie tracks, Transformers really gives them a challenge.  I'm guessing these are a good step-up from the Mackies?

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Scott Bolt

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Re: JBL PRX615m and PRX618s-xlf
« Reply #1 on: May 20, 2011, 06:21:23 pm »

I would say that with subs, it is a substantial upgrade. 

Just the PRX612m alone, I would say that it is better, with more head-room, but not a big step up.
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Jerome Casinger

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Re: JBL PRX615m and PRX618s-xlf
« Reply #2 on: May 20, 2011, 09:42:16 pm »

So I'm about to pull the trigger on two of the JBL PRX615m's and PRX618s-xlf's and just wanted last minute input, pro's and con's.

These are for my outdoor movie company and I'll eventually be adding two more subs and up to four more mains, just don't have that kind of cash for an all at once purchase.

I've been running Mackie SRM450's and while they have worked fine I have had some minor issues with them clipping out on really dynamic potions of movie tracks, Transformers really gives them a challenge.  I'm guessing these are a good step-up from the Mackies?

Curious why the 615's?  I would think for movies you would want to go with the 635's over the 618xlf.  I hate the sound of 15's only in a top unless it is just hard rock stuff, but for everything else a 3 way box sounds so much better, or at least a 12" has smoother vocal reproduction. (IMO)

I currently have that exact system on order, been eagerly waiting its arrival.

Russel Murton

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Re: JBL PRX615m and PRX618s-xlf
« Reply #3 on: May 21, 2011, 06:52:25 am »

Curious why the 615's?  I would think for movies you would want to go with the 635's over the 618xlf.  I hate the sound of 15's only in a top unless it is just hard rock stuff, but for everything else a 3 way box sounds so much better, or at least a 12" has smoother vocal reproduction. (IMO)

I currently have that exact system on order, been eagerly waiting its arrival.

Man, building a 5.1/7.1 cinema system from some PRX's would be lovely.

635's full range left/right, two XLF's as LF channel in the centre, 612m's for surround and centre, put the centre ontop of the subs, surround's on stands.

Expand with four more XLF's, two under the 635's to make left/right 4 way, 4 XLF's centre for LF channel.
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Chris dePaola

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Re: JBL PRX615m and PRX618s-xlf
« Reply #4 on: May 21, 2011, 10:26:36 am »

So I'm about to pull the trigger on two of the JBL PRX615m's and PRX618s-xlf's and just wanted last minute input, pro's and con's.

These are for my outdoor movie company and I'll eventually be adding two more subs and up to four more mains, just don't have that kind of cash for an all at once purchase.

I've been running Mackie SRM450's and while they have worked fine I have had some minor issues with them clipping out on really dynamic potions of movie tracks, Transformers really gives them a challenge.  I'm guessing these are a good step-up from the Mackies?

Curious why the 615's?  I would think for movies you would want to go with the 635's over the 618xlf.  I hate the sound of 15's only in a top unless it is just hard rock stuff, but for everything else a 3 way box sounds so much better, or at least a 12" has smoother vocal reproduction. (IMO)

I currently have that exact system on order, been eagerly waiting its arrival.

Size, weight, and cost... Plus the competition is typically using Eon's or Mackie SRM450's so I need to keep my stuff in close to the same budget range so I don't price myself out of the business. With these I should still be able to charge the same amount for a gig and in the off season these I'm guessing will be a better sub-rental then the mackies...  I could be wrong on that but we'll see.

Can't wait for their arrival to see how they handle Transformers or some other similar movie.
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Chris dePaola

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Re: JBL PRX615m and PRX618s-xlf
« Reply #5 on: May 21, 2011, 10:28:05 am »

Curious why the 615's?  I would think for movies you would want to go with the 635's over the 618xlf.  I hate the sound of 15's only in a top unless it is just hard rock stuff, but for everything else a 3 way box sounds so much better, or at least a 12" has smoother vocal reproduction. (IMO)

I currently have that exact system on order, been eagerly waiting its arrival.

Man, building a 5.1/7.1 cinema system from some PRX's would be lovely.

635's full range left/right, two XLF's as LF channel in the centre, 612m's for surround and centre, put the centre ontop of the subs, surround's on stands.

Expand with four more XLF's, two under the 635's to make left/right 4 way, 4 XLF's centre for LF channel.

A 5.1 or 7.1 set-up as you described would be nice, then again it would get used very little as thats going to be out the budget range of 99.9% of potential customers.

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Tim Padrick

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Re: JBL PRX615m and PRX618s-xlf
« Reply #6 on: June 18, 2011, 11:49:57 pm »

You'll want something to go under those subs if you really want to reproduce some of the crazy (in a good way) stuff that's on some of today's films.
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Chris dePaola

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Re: JBL PRX615m and PRX618s-xlf
« Reply #7 on: June 20, 2011, 10:37:44 am »

You'll want something to go under those subs if you really want to reproduce some of the crazy (in a good way) stuff that's on some of today's films.

What do you mean? We ran 4 of the 618-xlf's center clustered this weekend and the sound on Transformers was wicked!
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Tim Padrick

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Re: JBL PRX615m and PRX618s-xlf
« Reply #8 on: July 04, 2011, 06:27:21 am »

What do you mean? We ran 4 of the 618-xlf's center clustered this weekend and the sound on Transformers was wicked!

If the XLF is (as reported) the same as a 718 (which is 1/2 of a 728), then relative to 60Hz it is (as independently measured) down 3.5dB at 40 Hz and 9.5dB at 30Hz (and there's a nice 2.5dB bump at 80Hz).
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Rob Truesdell

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Re: JBL PRX615m and PRX618s-xlf
« Reply #9 on: July 04, 2011, 01:03:56 pm »

What do you mean? We ran 4 of the 618-xlf's center clustered this weekend and the sound on Transformers was wicked!

If the XLF is (as reported) the same as a 718 (which is 1/2 of a 728), then relative to 60Hz it is (as independently measured) down 3.5dB at 40 Hz and 9.5dB at 30Hz (and there's a nice 2.5dB bump at 80Hz).


These passive box tunings might not be the same in this box due to the DSP tunings.
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Randall Hyde

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Re: JBL PRX615m and PRX618s-xlf
« Reply #10 on: July 04, 2011, 01:16:07 pm »

So I'm about to pull the trigger on two of the JBL PRX615m's and PRX618s-xlf's and just wanted last minute input, pro's and con's.

These are for my outdoor movie company and I'll eventually be adding two more subs and up to four more mains, just don't have that kind of cash for an all at once purchase.

I've been running Mackie SRM450's and while they have worked fine I have had some minor issues with them clipping out on really dynamic potions of movie tracks, Transformers really gives them a challenge.  I'm guessing these are a good step-up from the Mackies?

I just finished four movie nights using an old pair of JBL MPro 225 and Mpro 418s cabinets (powered by a pair of XTi 2000 amps and a DriveRack PA as the cross over).  The 225 columns are extremely directional, so I put them about 50-60' apart, back from the audience, and aimed at the same point at the back/center point of the FOH field. They worked great.

I realize weight and cost might be an issue, but I'd suggest the PRX625 cabinets. They're only 60 pounds but the extra driver will help a bit (though it will be more directional than the PRX615, which is great if you've got a deep audience, not so great if you've got a shallow audience).  As others have pointed out, the PRX638 will probably produce better sound, but in an outdoor movie night setting, with tons of people talking, kids screaming, traffic/environmental noise, etc., etc., I doubt the difference is going to be heard (folks, this isn't a theater here).

When you do have the bucks, I'd recommend two PRX625 columns on each side and cross-fire them. That will give you a very wide sound field without a whole lot of comb filtering (from each pair on the side, of course you still have issues with comb filtering from your left and right pair but there's little you can do about that if you want a stereo mix). Put the cabinets on (block) stands and get them at least 2-3' off the ground. The subs, of course, should be front and center (don't put them under the tops).
Cheers,
Randy Hyde
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Doug Fowler

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Re: JBL PRX615m and PRX618s-xlf
« Reply #11 on: July 04, 2011, 01:50:13 pm »

What do you mean? We ran 4 of the 618-xlf's center clustered this weekend and the sound on Transformers was wicked!

Well, once you discover the roughly one octave you are missing by using SR subs you might change your mind ;-)

I don't doubt you had "bass", but you missed the true sub-bass.

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Re: JBL PRX615m and PRX618s-xlf
« Reply #11 on: July 04, 2011, 01:50:13 pm »


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