Three Way System Hook Up

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DJMAGNO

DJ
Sep 21, 2010
373
9
DFW Metroplex
What's UP!!!

It's been a long time for me, I know I know... We are about to debut our Big Rig for the season with one of our biggest homecomings. I will list what we have.

2 JBL SRX 722
4 JBL SRX 718

Crown XTI1000 for 722 highs/tweeters (275w per channel @ 8ohms)
Crown I-Tech 4000 for 722 mids (2000w per channel @ 4ohms)
Crown I-Tech 8000 for subs. (4000w per channel @ 4ohms)

I know that the sound "goodness" is subjective, just looking for general crossover points on each. My thoughts were to cross the subs at 90/100hz and below, mids at 90/100hz to 1.2khz and highs at 1.2khz and above.

Setting up all amps via HiQnet System Architect.
 
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DJMAGNO said:
What's UP!!!

It's been a long time for me, I know I know... We are about to debut our Big Rig for the season with one of our biggest homecomings. I will list what we have.

2 JBL SRX 722
4 JBL SRX 718

Crown XTI1000 for 722 highs/tweeters (275w per channel @ 8ohms)
Crown I-Tech 4000 for 722 mids (2000w per channel @ 4ohms)
Crown I-Tech 8000 for subs. (4000w per channel @ 4ohms)

I know that the sound "goodness" is subjective, just looking for general crossover points on each. My thoughts were to cross the subs at 90/100hz and below, mids at 90/100hz to 1.2khz and highs at 1.2khz and above.

Setting up all amps via HiQnet System Architect.
Click to expand...
I really don't see how that equates to a three way configuration. Those speakers are going to produce what they are designed to do. If you want a TRUE three way system you should have a main signal going in to a 3 way crossover separating the signals to Bass, Mids & highs, each going to a separate amp to power dedicated bass, mids and highs (3 cabinets per side)
Another way is to take the full range signal and send it to three amps then have each amp crossed over for a particular frequency going to its own transducer.
In my opinion there should be no electronics inside the Box. The exception would be a Passive three way speaker system in one cabinet.
We have had this discussion here before and there are variations of what some call a three way system.
 
ahoustondj said:
I really don't see how that equates to a three way configuration. Those speakers are going to produce what they are designed to do. If you want a TRUE three way system you should have a main signal going in to a 3 way crossover separating the signals to Bass, Mids & highs, each going to a separate amp to power dedicated bass, mids and highs (3 cabinets per side)
Another way is to take the full range signal and send it to three amps then have each amp crossed over for a particular frequency going to its own transducer.
In my opinion there should be no electronics inside the Box. The exception would be a Passive three way speaker system in one cabinet.
We have had this discussion here before and there are variations of what some call a three way system.
Click to expand...

Perhaps I misunderstood what a three way system is. We are biamping the 722 with two different amps. The subs are getting a different amp. Each of these amps has their own DSP in which the crossover points will be set via HiQnet System Architect. In my original thread I indicated that there were 3 different amps and explained what each would be responsible for.

Anyone else care to chime in...
 
If I'm not mistaken the tops are bi ampable so you do have a 3 way system that's the advantage with JBL.
 
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DJ SVO said:
If I'm not mistaken the tops are bi ampable so you do have a 3 way system that's the advantage with JBL.
Click to expand...

Thanks! That's what I thought.

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steve149 said:
Assuming you set up the DSPs correctly in the amps, you have a true 3 way system.

Check here: http://soundforums.net/junior-varsity/2793-jbl-srx718-722-system-tunings.html#post20383 for some recommended tuning info.
Click to expand...

Thanks Steve... great info! I think I will call Harman/Crown/JBL on Tuesday to get their recommendations.
 
Yes you are correct. I did not take the time to read exactly what you wanted to do with what you have. Yes you can make it a three way system using System Architect and the corresponding Settings on the amps. My question would be do you really want to use the transducers from a SRX722, which is really designed for Full range, as a Tweeter or Midrange. I would use a Horn for Tweeter(s) and either a singe or multiple of 8" OR !0" for Midrange, as those will project Voice and Mid notes with more clarity than a 12". Again sure the settings may be correct to divide your whole spectrum into three but is the Design of the Transducer you want to use the most efficient and optimum for Mids and Highs.

I was trying to find it but can't, I believe EAW makes a Two way Bi ampable speaker for Mids and Highs only, No Bass. JBL also has the same.
 
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ahoustondj said:
Yes you are correct. I did not take the time to read exactly what you wanted to do with what you have. Yes you can make it a three way system using System Architect and the corresponding Settings on the amps. My question would be do you really want to use the transducers from a SRX722, which is really designed for Full range, as a Tweeter or Midrange. I would use a Horn for Tweeter(s) and either a singe or multiple of 8" OR !0" for Midrange, as those will project Voice and Mid notes with more clarity than a 12". Again sure the settings may be correct to divide your whole spectrum into three but is the Design of the Transducer you want to use the most efficient and optimum for Mids and Highs.

I was trying to find it but can't, I believe EAW makes a Two way Bi ampable speaker for Mids and Highs only, No Bass. JBL also has the same.
Click to expand...

Pretty moot at this point Canute. We have the speakers we bought now and plan to use them. I was told that the 722s are great for midranges and chose them over the 725s.

According to the JBL spec sheet I wouldn't use these for full range, unless anything below 80hz isn't wanted: http://www.jblpro.com/BackOffice/ProductAttachments/JBL.SRX722[1].pdf
 
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DJMAGNO said:
Pretty moot at this point Canute. We have the speakers we bought now and plan to use them. I was told that the 722s are great for midranges and chose them over the 725s.
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I understand! You are doing the design after the implementation. Why don't you then use them for Midranges and get something else for Tweeters/highs? Biamping one of the 12" speakers for Highs...hmmm I just don't know.Carry on!
 
ahoustondj said:
I understand! You are doing the design after the implementation. Why don't you then use them for Midranges and get something else for Tweeters/highs? Biamping one of the 12" speakers for Highs...hmmm I just don't know.Carry on!
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What are you talking about? There are three speakers in this enclosure. 2 12" speakers and a 4" Horn. Have you actually looked at the spec sheet on these speakers? Slow down and pay attention:

For the high
frequencies, a 2451H 102 mm (4 in)
voice-coil, neodymium compression
driver is mounted to a 75° by 50°
aluminum horn.
 
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DJMAGNO said:
What are you talking about? There are three speakers in this enclosure. 2 12" speakers and a 4" Horn. Have you actually looked at the spec sheet on these speakers? Slow down and pay attention:

For the high
frequencies, a 2451H 102 mm (4 in)
voice-coil, neodymium compression
driver is mounted to a 75° by 50°
aluminum horn.
Click to expand...
You are correct again. I can't remember where I looked but it only mentioned the two 12"! Carry on!
 
Whoa! What's with the hate coming out of the lone star state? 722's are great speakers! Although typically used in live sound for rock band use, and not something a DJ would typically use at a wedding or birthday party, but I would think they would be awesome for a prom or a huge party! They get DAMN loud and sound great. I would use JBL's recommended amp settings for crossover frequencies & limiter settings, then tweak the sound to the room with EQ.
 
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The 722s are one of the best sounding SRX boxes IMO. Coupled with a 728 or 2 718s and they are an awesome live sound rig. Probably overkill for most weddings, for a school show they would be killer.
 
steve149 said:
The 722s are one of the best sounding SRX boxes IMO. Coupled with a 728 or 2 718s and they are an awesome live sound rig. Probably overkill for most weddings, for a school show they would be killer.
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There is no hate. I love JBLs you all should know that. I love the SRX line. He wants to use the 12" as Mids and my opinion is that in a Three way configuration I would much rather use 10" speakers as mids as they will have more accurate reproduction than a 12". The first page I read was this and it made no mention of a high frequency driver. It was from a generic search. No need to keep the debate going on. I had not seen the PDF specs. I also never bad mouthed the line so I don't know where you all got that idea.

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steve149 said:
The 722s are one of the best sounding SRX boxes IMO. Coupled with a 728 or 2 718s and they are an awesome live sound rig. Probably overkill for most weddings, for a school show they would be killer.
Click to expand...
I have no argument with that at all.
 
Scott Harris said:
Whoa! What's with the hate coming out of the lone star state? 722's are great speakers! Although typically used in live sound for rock band use, and not something a DJ would typically use at a wedding or birthday party, but I would think they would be awesome for a prom or a huge party! They get DAMN loud and sound great. I would use JBL's recommended amp settings for crossover frequencies & limiter settings, then tweak the sound to the room with EQ.
Click to expand...

Homecoming for about 1500 students...
 
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DJMAGNO said:
Homecoming for about 1500 students...
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You might need a bit more power. In one of the Clubs where I Gig, one of the guys uses two SRX 728 boxes with Crown I-techs for each and its just enough for 500 people. However, he is filling more than a dance floor. Just sharing!!
 
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