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Sound Reinforcement - Forums for Live Sound Professionals - Your Displayed Name Must Be Your Real Full Name To Post In The Live Sound Forums => Pro AV Forum => Topic started by: Ben Polius on November 29, 2017, 06:38:09 AM

Title: What ratio of sub to top are people using with JBL SRX
Post by: Ben Polius on November 29, 2017, 06:38:09 AM
I know this is totally subjective, but when I ordered this system the guy at Harman looked at me strangely and said ďthatís a lot of sub for those tops, are you sure?Ē

Now I was under the impression 1x srx835 would ourrun 2x srx818, maybe even 3, but coverage would be limited.

What are your experiences?
Title: Re: What ratio of sub to top are people using with JBL SRX
Post by: TJ (Tom) Cornish on November 29, 2017, 08:45:36 AM
I know this is totally subjective, but when I ordered this system the guy at Harman looked at me strangely and said ďthatís a lot of sub for those tops, are you sure?Ē

Now I was under the impression 1x srx835 would ourrun 2x srx818, maybe even 3, but coverage would be limited.

What are your experiences?
What is your target volume?  If you want to run SRX835ps to their full capacity, you will need at least 2 SRX828sp per side, maybe more, depending on musical genre.  That's not a weakness of the SRX subs, but rather a reflection on low frequencies being a harder physics problem.  This ratio holds with every other speaker system, too.  That's the wrong way to approach this, however.  If your target volume is 90dB at 50' from the speakers, you will need considerably less than that. 

Keep in mind that with the SRX835ps, they are 60į speakers, so for coverage you may need 2 per side even if you don't need that many for volume. 
Title: Re: What ratio of sub to top are people using with JBL SRX
Post by: Ben Polius on November 29, 2017, 11:39:15 AM
What is your target volume?  If you want to run SRX835ps to their full capacity, you will need at least 2 SRX828sp per side, maybe more, depending on musical genre.  That's not a weakness of the SRX subs, but rather a reflection on low frequencies being a harder physics problem.  This ratio holds with every other speaker system, too.  That's the wrong way to approach this, however.  If your target volume is 90dB at 50' from the speakers, you will need considerably less than that. 

Keep in mind that with the SRX835ps, they are 60į speakers, so for coverage you may need 2 per side even if you don't need that many for volume.
That was my feeling exactly. I thought 4x 18ís per side and 1 top per side, 2 tops where more coverage is needed. For my first gig with it Iím going to use 2x18ís and 1xtop per side, Iím going to angle the tops in to the audience area as itís a fairly small space.

The guys at JBL weíre hinting toward 1x18 per 835. This didnít seem right to me so I ignored them when I ordered


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Title: Re: What ratio of sub to top are people using with JBL SRX
Post by: Scott Holtzman on November 29, 2017, 12:26:21 PM
That was my feeling exactly. I thought 4x 18ís per side and 1 top per side, 2 tops where more coverage is needed. For my first gig with it Iím going to use 2x18ís and 1xtop per side, Iím going to angle the tops in to the audience area as itís a fairly small space.

The guys at JBL weíre hinting toward 1x18 per 835. This didnít seem right to me so I ignored them when I ordered


Sent from my iPhone using Tapatalk

First you said "the guys at Harman" then you said "the guys at JBL" since they don't sell direct just who exactly are you talking to?   Who are you buying from?  If you are ordering small quantity and not buying from Mike Pyle more than likely you are paying too much.
Title: Re: What ratio of sub to top are people using with JBL SRX
Post by: Ray Aberle on November 29, 2017, 12:37:53 PM
I believe Ben is based in the UK, so the "usual channels" us colonists use might not be available to him over there. The JBL/Harman distribution structure may be different. [Understood he's still not buying DIRECT from Harman, but he might also have talked to application engineers at Harman before actually buying...]

-Ray
Title: Re: What ratio of sub to top are people using with JBL SRX
Post by: Mark Wilkinson on November 29, 2017, 12:38:12 PM

Might want to check out this thread....http://forums.prosoundweb.com/index.php/topic,164536.msg1515967.html#msg1515967
It a guy's experiences... saying what Scott's saying...
Title: Re: What ratio of sub to top are people using with JBL SRX
Post by: Scott Holtzman on November 29, 2017, 01:08:57 PM
I believe Ben is based in the UK, so the "usual channels" us colonists use might not be available to him over there. The JBL/Harman distribution structure may be different. [Understood he's still not buying DIRECT from Harman, but he might also have talked to application engineers at Harman before actually buying...]

-Ray

Ahhhh.....That damn US bias kicking in.

Speaking of SRX, I had never seen the 828's stacked horizontal with two 825's on top like you have on your home page.  It stacked nice, good height with the stage.  Something new to try when the lawn season kicks off again.
Title: Re: What ratio of sub to top are people using with JBL SRX
Post by: Ray Aberle on November 29, 2017, 02:02:41 PM
Ahhhh.....That damn US bias kicking in.

Speaking of SRX, I had never seen the 828's stacked horizontal with two 825's on top like you have on your home page.  It stacked nice, good height with the stage.  Something new to try when the lawn season kicks off again.
*technically* those are 725s and 728s. :-p

[And to be fair.... I might have 'borrowed' that photo when I was doing the re-design of my site. My 725s don't look that nice... My newer 728s do, though.]

It IS a good setup, and gets the height needed. As you know, though, everything matters based on the actual logistics of the show. My typical SRX rig is 2-over-2 per side, though. Been using that for a few shows lately where we're not flying anything, but need good power. Being all passive, it's nice being able to send just one NL4 per speaker stack.

-Ray
Title: Re: What ratio of sub to top are people using with JBL SRX
Post by: Matthew Palmer on October 26, 2021, 09:50:21 PM
What is your target volume?  If you want to run SRX835ps to their full capacity, you will need at least 2 SRX828sp per side, maybe more, depending on musical genre.  That's not a weakness of the SRX subs, but rather a reflection on low frequencies being a harder physics problem.  This ratio holds with every other speaker system, too.  That's the wrong way to approach this, however.  If your target volume is 90dB at 50' from the speakers, you will need considerably less than that. 

Keep in mind that with the SRX835ps, they are 60į speakers, so for coverage you may need 2 per side even if you don't need that many for volume.

i was thinking of srx 828p under the srx 835p for a future investment... one stack like that per side of stage. how many people outside do you think a rig like that would cover? Possibly getting outfills too...
Title: Re: What ratio of sub to top are people using with JBL SRX
Post by: Tim McCulloch on October 27, 2021, 01:11:51 PM
i was thinking of srx 828p under the srx 835p for a future investment... one stack like that per side of stage. how many people outside do you think a rig like that would cover? Possibly getting outfills too...

One covers *area*, not people.  Genre of music or presentation may be a limiting factor as TJ points out.
Title: Re: What ratio of sub to top are people using with JBL SRX
Post by: Kirk Olson on October 27, 2021, 03:21:00 PM
I ran 4 -835's over 4 828's (two each per side) for about 4 years.  This proved a pretty good ratio for most of my gigs (bar bands, street fairs, beer garden concerts....).  When I got the chance, I would spread the subs across the front of stage and put the tops on scaffolding, but this wasn't the norm.  In this configuration, bass response was predictably better and more uniform, with more "punch". 
A couple years ago, I acquired two additional 828's, so now normally stack 2 835's over 3 828's per side.  I did this mainly to get the tops higher in the outdoor gigs, which proved a very good thing for "throw" and top end clarity for the bigger crowds. 
One 835 over a 818...you can get just as good of results running the 835 full range.  I did have a smaller setup of SRX812's over 818's, so have experience with the single 18's also.  For smaller gigs, one 835 over one 828 per side is plenty adequate, but the tops will outrun the bottoms if you let them (depending on your content). 
I would say at least a one to one ratio for the 835 and 828 combo as a minimum.  The single 18's (SRX818SP) have their place (drum monitor-DJ) but are definitely the weak link in the SRX800 series, in my humble opinion.